This page has only limited features, please log in for full access.
This study investigates the multiscale roughness effects on hydrodynamic heat transfer (or heat transfer associated with water flow) in a single fracture, based on direct numerical simulations of fluid flow and heat transfer in fracture-matrix systems with or without secondary roughness considered. The simulation results show that the primary roughness controls the low velocity regions and the overall flow direction in the fracture, while the secondary roughness enhances the complexity of the flow near the local sharp cornered asperities and promotes the generation of eddies. The changes of flow behavior could in turn profoundly affect the water temperature distribution and local heat transfer coefficient in the fracture-matrix system. In addition, two competing mechanisms impacting the overall heat transfer coefficient (h) due to the multiscale roughness are revealed. On one hand, the increase in flow velocity induced by primary and secondary roughness increases h. On the other hand, the eddy zone induced by the secondary roughness can trap the high-temperature fluid and inhibit the heat transfer from the fracture surface to the ambient fluid, which could decrease h. The macroscopic effect of surface roughness on h is the result of the joint action of these two competing influence mechanisms.
Jie Tan; Long Cheng; Guan Rong; HongBin Zhan; Junsong Quan. Multiscale roughness influence on hydrodynamic heat transfer in a single fracture. Computers and Geotechnics 2021, 139, 104414 .
AMA StyleJie Tan, Long Cheng, Guan Rong, HongBin Zhan, Junsong Quan. Multiscale roughness influence on hydrodynamic heat transfer in a single fracture. Computers and Geotechnics. 2021; 139 ():104414.
Chicago/Turabian StyleJie Tan; Long Cheng; Guan Rong; HongBin Zhan; Junsong Quan. 2021. "Multiscale roughness influence on hydrodynamic heat transfer in a single fracture." Computers and Geotechnics 139, no. : 104414.
Simplified analytical models of the single-well push–pull (SWPP) test have been widely used to estimate the regional flow velocity and the aquifer porosity, where the simplifications refer to that the dispersion effect is negligible, and the flow is steady state during the entire SWPP test. However, the errors caused by such assumptions have not been investigated thoroughly. In this study, numerical modeling of the SWPP test without above-mentioned simplifications and the field experimental data will be employed to test the applicability of the simplified analytical models. The numerical simulation is based on a mathematical model composed of a two-dimensional transient flow and transport model, which will be solved by the finite-element method. The results indicate that errors increase with the increasing dispersivity when using the simplified analytical models to estimate both regional flow velocity and porosity. The errors refer to the relative difference between the input parameters of the numerical modeling and the estimated parameters by the simplified models. Such errors also depend on the input values of regional groundwater velocity, drift time of the SWPP test, and aquifer porosity. Specifically, the errors caused by the simplified models of estimating regional groundwater velocity decrease with increasing input regional groundwater velocity, increasing input drift time, and decreasing input porosity. The errors produced by the simplified models of estimating porosity decrease with increasing input regional groundwater velocity, increasing input drift time, and decreasing input porosity. Field in-situ experiments show that the fitness of the observed breakthrough curves (BTCs) by the numerical modeling is far better than the simplified analytical models. The estimated regional flow velocity by the numerical modeling of this study is closer to the estimated values by previous other studies.
Quanrong Wang; Aohan Jin; HongBin Zhan; Yu Chen; Wenguang Shi; Hui Liu; Yu Wang. Revisiting simplified model of a single-well push–pull test for estimating regional flow velocity. Journal of Hydrology 2021, 601, 126711 .
AMA StyleQuanrong Wang, Aohan Jin, HongBin Zhan, Yu Chen, Wenguang Shi, Hui Liu, Yu Wang. Revisiting simplified model of a single-well push–pull test for estimating regional flow velocity. Journal of Hydrology. 2021; 601 ():126711.
Chicago/Turabian StyleQuanrong Wang; Aohan Jin; HongBin Zhan; Yu Chen; Wenguang Shi; Hui Liu; Yu Wang. 2021. "Revisiting simplified model of a single-well push–pull test for estimating regional flow velocity." Journal of Hydrology 601, no. : 126711.
Karst water in the Middle Cambrian-Lower Ordovician carbonates is the ecological resources and domestic water in the Huainan coalfield (Anhui Province, China), but it also directly threatens the safe production of coal mines due to the development of paleokarst and karst collapse columns (KCCs). Most of the Middle Cambrian-Lower Ordovician carbonates in Northern China experienced multistage tectonic movements and were affected by multi-type corrosive fluids, but very few studies focused on the effect of multistage fluid-rock reaction on the formation of paleokarst and KCCs. To investigate the formation mechanisms and characteristics of paleokarst and KCCs, this study integrated petrographic studies, isotope geochemistry (C and O) and minor elements (Ba, Mn, and Sr), and clarified the sources and types of corrosive fluids. Through this study, meteoric water, formation water, hydrothermal fluids, and mixing fluids were determined as the four main types of corrosive fluids that formed pores, vugs, fractures, caves, and KCCs in the Middle Cambrian-Lower Ordovician carbonates. The meteoric dissolution is controlled by carbonic acid solution recharge conditions which affect the karst development in the Cambrian and Ordovician paleoweathering crusts and local carbonate outcrops. Hydrothermal fluids with high-temperature, high-pressure and high-corrosivity can develop a strong hydrothermal pore-fracture system in the Cambrian carbonate, which is the reason that KCCs can develop in the Cambrian strata in the Huainan coalfield. The mixing dissolution is controlled by sulfuric acid dissolution and usually occurs in the water tables and the fault and fracture zones, which are conducive to the development of caves and KCCs. In addition to the above four corrosive fluids, the development of paleokarst and KCCs in the Huainan area is also controlled by stratigraphic lithology and geological structures, especially for faults and fractures, which are the main migration channels of corrosive fluids. An evolution model of paleokarst and KCCs was established, providing a plausible interpretation for better understanding of the spatial distribution of paleokarst and KCCs. In practice, this study provides critical references for predicting the spatial distribution of paleokarst and KCCs in Northern China coalfields, as well as the exploration and development of karst water around the world.
Haitao Zhang; Guangquan Xu; HongBin Zhan; Jianbin Zheng; Minhua Wang; Mancai Liu; Shengqiang Pan; Nan Wang. Formation mechanisms of paleokarst and karst collapse columns of the Middle Cambrian-Lower Ordovician carbonates in Huainan coalfield, Northern China. Journal of Hydrology 2021, 601, 126634 .
AMA StyleHaitao Zhang, Guangquan Xu, HongBin Zhan, Jianbin Zheng, Minhua Wang, Mancai Liu, Shengqiang Pan, Nan Wang. Formation mechanisms of paleokarst and karst collapse columns of the Middle Cambrian-Lower Ordovician carbonates in Huainan coalfield, Northern China. Journal of Hydrology. 2021; 601 ():126634.
Chicago/Turabian StyleHaitao Zhang; Guangquan Xu; HongBin Zhan; Jianbin Zheng; Minhua Wang; Mancai Liu; Shengqiang Pan; Nan Wang. 2021. "Formation mechanisms of paleokarst and karst collapse columns of the Middle Cambrian-Lower Ordovician carbonates in Huainan coalfield, Northern China." Journal of Hydrology 601, no. : 126634.
Solar activity including sunspot number (SSN) and EI Niño-Southern Oscillation (ENSO) affect both surface and subsurface hydrological processes in arid-semiarid regions of the world, thus evaluating multi-scale hydrological response to global climate changes can provide valuable information on regional water resources management and ecological restoration. In this study, we utilize wavelet coherence together with continuous wavelet transform to analyze the influence of SSN and ENSO on multiple interacting hydrological processes and distinguish nonstationary patterns in annual precipitation and extreme precipitation events and their effects on short-term or long-term streamflow variations and periodic flooding in Xinjiang, an arid-semiarid region of China. The results indicate that the climate in Xinjiang has become wetter during the period 1960–2019. Extreme precipitation events in Xinjiang have significant oscillation periods at the 2–4 years band, and stations with strong extreme precipitation events are located in northern Xinjiang and Tianshan mountain area, while stations with weak extreme precipitation events are found in southern Xinjiang. The annual precipitation has significant multiple-periodicities at the 2–7-year band, at the 7–11-year band, and at the 13–15-year band. Furthermore, annual streamflow data for nine natural rivers all have significant dominant periodicities at inter-annual scale of 2–4-year and 4–7-year band, and monthly streamflow data for Yarkand river has significant periodicities at intra-annual scale of 3–7-month and 8–14-month band. Since evolution of annual streamflow variability and monthly streamflow variability all show direct response to precipitation features, increasing extreme precipitation events significantly affect streamflow fluctuation of natural rivers in Xinjiang. Overall, SSN and ENSO is viewed as one of the main drivers for annual precipitation or extreme precipitation periodic variation by either enhancing or suppressing convection, and the SSN and ENSO-modulated precipitation anomaly contributes to significant streamflow variation or regional flooding disasters. Investigating the detailed linkage between interannual to multidecadal climate variability and hydrometeorological variables will help decision-makers and scientists to better understand variability in regional hydrological processes, which has great implications for water resources planning and operations in Xinjiang under future climate uncertainty.
Lin Zhang; Yanfeng Liu; HongBin Zhan; Menggui Jin; Xing Liang. Influence of solar activity and EI Niño-Southern Oscillation on precipitation extremes, streamflow variability and flooding events in an arid-semiarid region of China. Journal of Hydrology 2021, 601, 126630 .
AMA StyleLin Zhang, Yanfeng Liu, HongBin Zhan, Menggui Jin, Xing Liang. Influence of solar activity and EI Niño-Southern Oscillation on precipitation extremes, streamflow variability and flooding events in an arid-semiarid region of China. Journal of Hydrology. 2021; 601 ():126630.
Chicago/Turabian StyleLin Zhang; Yanfeng Liu; HongBin Zhan; Menggui Jin; Xing Liang. 2021. "Influence of solar activity and EI Niño-Southern Oscillation on precipitation extremes, streamflow variability and flooding events in an arid-semiarid region of China." Journal of Hydrology 601, no. : 126630.
Hexavalent chromium (Cr(VI)) in groundwater impose serious health problems for human society. This study investigates the potential of using calcium (Ca) bentonite amended with sodium hexametaphosphate (SHMP) as a backfill constituent material in the soil-bentonite slurry trench wall to envelop the Cr(VI) impacted groundwater. The hydraulic conductivity (K) and consolidation of backfill comprising of 80 wt% sand and 20 wt% SHMP-amended Ca-bentonite were determined via flexible-wall permeameter tests and oedometer tests, respectively. Microstructure characterizations of the amended bentonites before and after contamination were also explored. The results indicated that when the permeated liquid changed from tap water to Cr(VI) solution, the tested specimens exhibited a 1.0 to 1.2-fold variation in short-term K, with all K values fall in range of 2.1 × 10−10 to 2.5 × 10−10 m/s. This mild variation may be attributed to terminate the tests without achieving chemical equilibrium. On the other hand, the Cr(VI) solution had insignificant effect on consolidation of the amended backfill, which is attributed to the dominated incompressible sand matrix skeleton in the backfill that withstood the consolidation pressure and shield the negative effects of the contaminated solution. The microstructure images revealed that the Cr(VI) resulted in relatively strong interlink between particles. Overall, the SHMP-amended bentonite is promising for enhancing Cr(VI) containment performance of the soil-bentonite slurry trench wall backfills.
Yuling Yang; Krishna R. Reddy; HongBin Zhan; Ridong Fan; Songyu Liu; Qiang Xue; Yanjun Du. Hydraulic conductivity of soil-bentonite backfill comprised of SHMP-amended Ca-bentonite to Cr(VI)-impacted groundwater. Journal of Contaminant Hydrology 2021, 242, 103856 .
AMA StyleYuling Yang, Krishna R. Reddy, HongBin Zhan, Ridong Fan, Songyu Liu, Qiang Xue, Yanjun Du. Hydraulic conductivity of soil-bentonite backfill comprised of SHMP-amended Ca-bentonite to Cr(VI)-impacted groundwater. Journal of Contaminant Hydrology. 2021; 242 ():103856.
Chicago/Turabian StyleYuling Yang; Krishna R. Reddy; HongBin Zhan; Ridong Fan; Songyu Liu; Qiang Xue; Yanjun Du. 2021. "Hydraulic conductivity of soil-bentonite backfill comprised of SHMP-amended Ca-bentonite to Cr(VI)-impacted groundwater." Journal of Contaminant Hydrology 242, no. : 103856.
Well testing in double-porosity fractured aquifers or oil and gas reservoirs is one of the long-lasting research problems in subsurface hydrology and petroleum engineering, where the double-porosity implies that the media of concern can be approximated as a two interrelated continuums (fracture network and rock matrix) with two distinctively different porosities. However, most of those studies in double-porosity fractured aquifers only concern Darcian flow in the fractured continuum. In this study, we will expand such studies from Darcian flow regime to non-Darcian flow regime, which is most likely to be the case for the field well testing site reported in this investigation. New solutions based on power law and a linearization approximation are obtained for hydraulic heads in Laplace domain and subsequently inverted to give spatiotemporal distributions in real-time domain. The non-Darcian flow model in single porosity media is obtained by setting the leakage coefficient (C) to 0 or the storage coefficient of the matrix (Sm) to 0, where C is the rate of fluid transfer between the fracture and rock matrix. Parameter analysis is conducted using dimensionless formats. A larger dimensionless quasi conductivity coefficient KqD, a larger drawdown in the early stage, and a smaller drawdown in the late stage. The dimensionless parameters CD and ϕ influence the drawdown in transitional state, and the values get larger, the drawdown in transitional state drop smaller. A pumping test conducted in Huangtun, Anhui province of China has been applied to test the non-Darcian flow effect in a double-porosity aquifer, in which a particle swarm optimization (PSO) algorithm will be applied here to seek the optimal hydraulic parameters. As the result shows, the observed drawdown data fit well with the new model in the pumping stage. The predicted recovery drawdown curve with the calculated parameters of the new model also performs well with the field drawdown data, which supports the applicability of the new model to interpret the field data.
Yilin Wang; HongBin Zhan; Kun Huang; Linqing He; Junwei Wan. Identification of non-Darcian flow effect in double-porosity fractured aquifers based on multi-wells pumping tests. Journal of Hydrology 2021, 600, 126541 .
AMA StyleYilin Wang, HongBin Zhan, Kun Huang, Linqing He, Junwei Wan. Identification of non-Darcian flow effect in double-porosity fractured aquifers based on multi-wells pumping tests. Journal of Hydrology. 2021; 600 ():126541.
Chicago/Turabian StyleYilin Wang; HongBin Zhan; Kun Huang; Linqing He; Junwei Wan. 2021. "Identification of non-Darcian flow effect in double-porosity fractured aquifers based on multi-wells pumping tests." Journal of Hydrology 600, no. : 126541.
Accurate estimation of the temporal and spatial root water uptake patterns in root zone is needed for an improved understanding of water and chemical transport dynamics in vadose zone. Rooting system is of great importance to describe the plant root water uptake directly. In this study, the diffusive root growth model was coupled with the Environmental Policy Integrated Climate (EPIC) crop growth model through changing the boundary condition, and a new semianalytical solution of the modified root diffusive model was derived considering the dynamic root length density distribution simulated by the EPIC crop growth model. To test the modified root growth model, the field-measured data of maize (Zea mays L.) and tomato (Solanum lycopersicum L.) root length density distribution were used for parameter optimization. A MATLAB program was developed by coupling the modified root diffusive model with the genetic algorithm to facilitate the parameters optimization. Results showed that the simulated root length density distribution at different times was in a good agreement with the observed values. The RMSE and bias values ranged from 0.22 to 0.25 cm cm–3 and from −3.0 to 24.5%, respectively. The modified diffusive root growth model can therefore be used to simulate the two-dimensional root growth during the crop growing period.
Jun Wang; Guanhua Huang; HongBin Zhan; Binayak Mohanty; Jiusheng Li; Lincoln Zotarelli. A semianalytical solution of the modified two‐dimensional diffusive root growth model. Vadose Zone Journal 2021, e20132 .
AMA StyleJun Wang, Guanhua Huang, HongBin Zhan, Binayak Mohanty, Jiusheng Li, Lincoln Zotarelli. A semianalytical solution of the modified two‐dimensional diffusive root growth model. Vadose Zone Journal. 2021; ():e20132.
Chicago/Turabian StyleJun Wang; Guanhua Huang; HongBin Zhan; Binayak Mohanty; Jiusheng Li; Lincoln Zotarelli. 2021. "A semianalytical solution of the modified two‐dimensional diffusive root growth model." Vadose Zone Journal , no. : e20132.
A general semi-analytical model for transient flow in a three-layered aquifer system with a partial penetration well having a variable discharge of pumping is developed with the consideration of the interface flow on the adjacent layers. This general three-layer system includes the conventional aquitard-aquifer-aquitard system as a subset and does not require that the permeability contrasts of different layers must be greater than a few orders of magnitude and does not ignore any flow components (either vertical or horizontal) in any layer. The pumping well of infinitesimal radius is screened at any portion of the middle layer. Three widely used types of top and bottom boundary conditions are assigned prescribed head (Case 1), zero flux (Case 2), or prescribed head at top and zero flux at bottom (Case 3). Laplace domain solutions for dimensionless drawdown are obtained using Hankel transformation, and associated time-domain solutions are evaluated numerically. The newly obtained solutions include some available solutions for two- or single-layer aquifer systems as subsets. The drawdowns for individual layers caused by a well with an exponentially decreased discharge are explored as an example of illustration. The results indicate that the pumped layer drawdown close to the partially penetrated well is mainly influenced by the variable pumping rate. The late-time drawdown for all layers is remarkably affected by the chosen types of top and bottom boundary conditions, and the drawdown for Case 3 is greater than that for Case 1 and smaller than that for Case 2. Additionally, the effect of the pumped layer anisotropy on drawdowns in the three-layer system is significant, and the anisotropy of the unpumped layers significantly affects the drawdown in the whole aquifer system without large contrast of hydraulic conductivity between the unpumped layers and the pumped layer. The drawdowns in all three layers are greatly affected by the location and length of well screen, and a larger drawdown can be seen at the position that is closer to the middle point of the screen of the partially penetrating pumping well.
Qinggao Feng; Zhenwu Liu; HongBin Zhan. Semi-analytical solutions for transient flow to a partially penetrated well with variable discharge in a general three-layer aquifer system. Journal of Hydrology 2021, 598, 126329 .
AMA StyleQinggao Feng, Zhenwu Liu, HongBin Zhan. Semi-analytical solutions for transient flow to a partially penetrated well with variable discharge in a general three-layer aquifer system. Journal of Hydrology. 2021; 598 ():126329.
Chicago/Turabian StyleQinggao Feng; Zhenwu Liu; HongBin Zhan. 2021. "Semi-analytical solutions for transient flow to a partially penetrated well with variable discharge in a general three-layer aquifer system." Journal of Hydrology 598, no. : 126329.
Unclogged streams are widespread in nature and can generate dynamic inverted saturated zones (ISZ) underneath the streams above the regional water tables. This study is devoted to investigating the evolutional process of such an ISZ and its frontal movement. It defines a uniform saturation zone by moving the boundary of saturation flow from the inverted water table (IWT) to the end of the capillary saturation zone. Consequently, the conventional concept of specific yield, infiltration rate and governing equation at the ISZ frontal surface (IFS) must be revisited. Two new ISZ models are developed and quantified with great details with infiltration rate being constant and variable. The equations of hydraulic head profile development and the IFS are obtained. This study indicates that classical free surface equations, locating at IWT, is not self-consistent. The water balance requirement is not satisfied at IFS in the Green and Ampt (1911) model or the Polubarinova-Kochina (1962) model, causing physically unrealistic spatial variables. The increase of the IFS with time exhibits three different modes depending on the infiltration rate and the saturated hydraulic conductivity. The maximum depth of an IFS (corresponding to a depth with infiltration rate being stable) is linearly correlated with stream stage and air-entry head. The streambed infiltration flux decreases with time and appears to exhibit three modes similar to the IFS evolution. The findings of this study reconstruct the theoretical basis of the dynamic evolution process of stream-aquifer system and can help for better understanding of physical connotation of free surface equations and basic characteristics of ISZ evolution.
Dawei Cheng; HongBin Zhan; Jie Li; Donghui Cheng. Characteristics of inverted saturated zone under unclogged streams. Journal of Hydrology 2021, 597, 126288 .
AMA StyleDawei Cheng, HongBin Zhan, Jie Li, Donghui Cheng. Characteristics of inverted saturated zone under unclogged streams. Journal of Hydrology. 2021; 597 ():126288.
Chicago/Turabian StyleDawei Cheng; HongBin Zhan; Jie Li; Donghui Cheng. 2021. "Characteristics of inverted saturated zone under unclogged streams." Journal of Hydrology 597, no. : 126288.
Semi-infinite unconfined-fractured strip shaped aquifer systems are common in alluvial plain margins, but have received little attention in the hydrogeological community. Thus, the aim of this study is to present semi-analytical solutions of flow to a well in these aquifer systems. Two conceptual models are considered: 1-An unconfined aquifer with a lateral fractured aquifer and a pumping well installed in the unconfined aquifer (model I); 2-An unconfined aquifer with a lateral fractured aquifer and a pumping well installed in the fractured aquifer (model II). A transition zone is considered between two aquifers. Three-dimensional groundwater flows are considered in unconfined, fractured and transition zone aquifers. Homogeneous, anisotropic hydraulic conductivity and instantaneous drainage water table condition are assumed first but can be relaxed to accommodate delayed drainage water table condition if needed. The point sink/source solutions are obtained via finite and infinite Fourier transforms for space and Laplace transform for time. The line sink/source solutions are obtained via integration along the desired direction. The uniform flux and uniform head boundary conditions are considered for the pumping well. The vertical distribution of the flux toward the well screen is explored. The effects of inner well condition on the variation of the dimensionless drawdown and boundary depletion volume are investigated. We investigate the influences of the hydraulic parameters of the transition zone on the spatial and temporal variations of the sensitivity of the drawdown to hydraulic parameters of the aquifer system. Furthermore, the influences of the transition zone on the spatial distribution of the drawdown are explored. The results of this study can be utilized to evaluate head distribution in the aquifer system; to calculate the water budget of the alluvial aquifers near a fractured one; to analyze the influences of a transition zone on the head and flow distribution in the aquifer system.
Mohammad M. Sedghi; HongBin Zhan. Groundwater flow to a well in a strip-shaped unconfined-fractured aquifer system with a transition zone. Journal of Hydrology 2021, 596, 126087 .
AMA StyleMohammad M. Sedghi, HongBin Zhan. Groundwater flow to a well in a strip-shaped unconfined-fractured aquifer system with a transition zone. Journal of Hydrology. 2021; 596 ():126087.
Chicago/Turabian StyleMohammad M. Sedghi; HongBin Zhan. 2021. "Groundwater flow to a well in a strip-shaped unconfined-fractured aquifer system with a transition zone." Journal of Hydrology 596, no. : 126087.
Countermeasures against seawater intrusion (SWI) are critical to prevent coastal groundwater deterioration. Among different measures to prevent seawater intrusion, subsurface dams have shown to be an effective approach, but it is likely to produce residual saltwater behind the dam in a landward aquifer. This study investigated the influences of subsurface dam design and aquifer properties on the dynamic characteristics of residual saltwater in a field‐scale aquifer and for the first time revealed the desalinization mechanism of residual saltwater behind the dams from the point of mixing zone. It was found that the low‐concentration mixing zone (LCMZ) (for the area between 10%‐50% of seawater salinity) was a major channel for the saltwater to flow over the dam to the ocean boundary while the residual salt was continuously dispersed to the LCMZ from the high‐concentration mixing zone (HCMZ) (for the area between 50% ‐ 90% of seawater salinity) under high concentration gradients. Moreover, we developed two formulas of the reduction rate of saltwater wedge length (RSWL*) and the removal rate of total salt mass (RTSM*) to evaluate the desalination effectiveness of high‐ and low‐concentration residual saltwater, respectively. The results showed that it took much longer time for a taller dam and a dam at a closer position to the sea boundary to desalinize the high‐concentration residual saltwater in the upstream aquifer, more than 50 years for the cases of dam height beyond 16 meters. On the contrary, only a slightly shorter time was needed to remove the low‐concentration saltwater behind the dams with the decrease of the distance from the sea boundary. Aquifer properties including the hydraulic gradient, hydraulic conductivity and dispersivity strongly altered the desalinization time of the residual saltwater. The dispersivity was found to be the most critical factor influencing the removal effectiveness of saltwater retained in the landward aquifer. Increase of dispersivity from 1 to 3 m can dramatically reduce the desalinization time from more than 30 to 4 years.This article is protected by copyright. All rights reserved.
Tianyuan Zheng; Xilai Zheng; Qinpeng Chang; HongBin Zhan; Marc Walther. Timescale and Effectiveness of Residual Saltwater Desalinization Behind Subsurface Dams in an Unconfined Aquifer. Water Resources Research 2021, 57, 1 .
AMA StyleTianyuan Zheng, Xilai Zheng, Qinpeng Chang, HongBin Zhan, Marc Walther. Timescale and Effectiveness of Residual Saltwater Desalinization Behind Subsurface Dams in an Unconfined Aquifer. Water Resources Research. 2021; 57 (2):1.
Chicago/Turabian StyleTianyuan Zheng; Xilai Zheng; Qinpeng Chang; HongBin Zhan; Marc Walther. 2021. "Timescale and Effectiveness of Residual Saltwater Desalinization Behind Subsurface Dams in an Unconfined Aquifer." Water Resources Research 57, no. 2: 1.
The boundary layer thickness and influence in the single-phase flow in the tight reservoirs have been widely measured. The influence of boundary layer on the oil migration into originally water-saturated tight reservoirs has been theoretically deduced but has not been experimentally validated. In this work, the existence of boundary layer in tight reservoir oil migration is investigated by comparing the oil migration with the influence of boundary layer (measured by tight sandstone oil accumulation experimental simulation) and theoretical oil migration without the influence of boundary layer (derived from rate-controlled mercury injection). The distribution of boundary layer in the tight reservoir is detected by nuclear magnetic resonance centrifugation. The influence of boundary layer on oil migration is discussed by modeling tight reservoir oil migration and analyzing the relationships between oil migration characteristics and tight reservoir pore-throat structures. The results turn out that the boundary layer distributes in all sizes of pores in the tight reservoirs and becomes thinner with the pressure gradient increment. The oil migration into the tight reservoirs is a coupled effect of the increasing driving force and the decreasing capillary pressure caused by boundary layer thinning. The pore-throats in the tight reservoirs are heavily blocked by boundary layer, while the pore-bodies are almost unaffected by boundary layer.
Xiao Feng; Jianhui Zeng; HongBin Zhan; Yongchao Zhang; Juncheng Qiao; Sen Feng. Influence of Boundary Layer on Oil Migration into Tight Reservoirs. Transport in Porous Media 2021, 137, 87 -107.
AMA StyleXiao Feng, Jianhui Zeng, HongBin Zhan, Yongchao Zhang, Juncheng Qiao, Sen Feng. Influence of Boundary Layer on Oil Migration into Tight Reservoirs. Transport in Porous Media. 2021; 137 (1):87-107.
Chicago/Turabian StyleXiao Feng; Jianhui Zeng; HongBin Zhan; Yongchao Zhang; Juncheng Qiao; Sen Feng. 2021. "Influence of Boundary Layer on Oil Migration into Tight Reservoirs." Transport in Porous Media 137, no. 1: 87-107.
Inflow to a tunnel is a great public concern and is closely related to groundwater hydrology, geotechnical engineering and mining engineering, among other disciplines. Rapid computation of inflow to a tunnel provides a timely means for quickly assessing the inflow discharge, thus is critical for safe operation of tunnels. Dewatering of tunnels is another engineering practice that should be planned. In this study, an analytical solution of the inflow to a tunnel in a fractured unconfined aquifer is obtained. The solution takes into account either the spherical or slab shaped matrix block and the unsteady state inter‐porosity flow. The instantaneous drainage water table and anisotropic hydraulic conductivities of the fractures network are also considered. Both uniform flux and uniform head boundary condition are considered to simulate the constant head boundary condition in the tunnel. The effects of the hydraulic parameters of the fractured aquifer on the inflow variation of the tunnel are explored. The application of the presented solution to obtain the optimum location and discharge of the well to minimize the inflow to a tunnel is illustrated. This article is protected by copyright. All rights reserved.
Mohammad M. Sedghi; HongBin Zhan. On Inflow to a Tunnel in a Fractured Double‐Porosity Aquifer. Groundwater 2021, 1 .
AMA StyleMohammad M. Sedghi, HongBin Zhan. On Inflow to a Tunnel in a Fractured Double‐Porosity Aquifer. Groundwater. 2021; ():1.
Chicago/Turabian StyleMohammad M. Sedghi; HongBin Zhan. 2021. "On Inflow to a Tunnel in a Fractured Double‐Porosity Aquifer." Groundwater , no. : 1.
This study is the first to evaluate the effects of Iron oxides (FeOx) species and their decoration on graphene oxide/chitosan (GO/CS) composites for Cr(VI) removal and the possibility of Fe secondary pollution. Results show that Fe(III) is a better decoration material than Fe(II) and decoration through immersion-evaporation shows a higher adsorption capacity of Cr(VI) (Qe) than co-precipitation. Fe2O3-GO/CS as the only eco-friendly composite for enhanced Cr(VI) removal is further used for batch adsorption experiments, characterization, kinetics, isotherms, and thermodynamic studies. It is found that Cr(VI) removal mainly includes electrostatic attraction between Cr(VI) oxyanions and surface -NH3+ and -OH2+, and the adsorbed Cr(VI) partially reduces to Cr(III). Qe increases with the increasing initial Cr(VI) concentration, contact time, and temperature, while decreases with the increasing pH and mass and volume ratio (m/v). The coexisting ions (Cl−, NO3−, SO42−, PO43−, As, Fe, and Pb) can cause an obvious decrease of Qe. The removal efficiency (Re) and Qe are 94.3% and 83.8 mg/g, respectively under the optimal conditions. After five times of regeneration, Re is still as high as 84% and Qe drops about 2.6%. Cr(VI) adsorption is spontaneous and endothermic, which is best fitted with the Sips model, and the fitted maximum Qe is 131.33 mg/g.
Huimei Shan; Chunya Zeng; Chaoran Zhao; HongBin Zhan. Iron oxides decorated graphene oxide/chitosan composite beads for enhanced Cr(VI) removal from aqueous solution. International Journal of Biological Macromolecules 2021, 172, 197 -209.
AMA StyleHuimei Shan, Chunya Zeng, Chaoran Zhao, HongBin Zhan. Iron oxides decorated graphene oxide/chitosan composite beads for enhanced Cr(VI) removal from aqueous solution. International Journal of Biological Macromolecules. 2021; 172 ():197-209.
Chicago/Turabian StyleHuimei Shan; Chunya Zeng; Chaoran Zhao; HongBin Zhan. 2021. "Iron oxides decorated graphene oxide/chitosan composite beads for enhanced Cr(VI) removal from aqueous solution." International Journal of Biological Macromolecules 172, no. : 197-209.
Darcy’s law, which defines a linear relationship between the specific discharge and the hydraulic gradient, is commonly applied in many disciplines including hydraulic engineering, hydrogeology, environmental engineering, plant physiology, etc. However, Darcy’s law can become invalid under certain conditions where the flow velocity is larger or smaller than a critical value, thereby producing a non-Darcian flow. Non-Darcian flow problems have been found to be relatively more difficult to deal with due to associated high degree of nonlinearity. Nevertheless, in the past few decades, great progress has been made in the study of non-Darcian flow problems in several geoscience disciplines. In this review paper, we introduce the background of the laws governing non-Darcian flow behavior. We also review and elaborate on the recent developments on non-Darcian flow in high- and low-permeability media, and non-Darcian flow associated with heat transfer, gas phase non-Darcian flow and multiphase. In addition to these, three advanced topics (plant physiology, biological tissues, nanofluids), as well as new methods used in solving non-Darcian flow problems are presented. In each area, we introduce the related practical problems and then elucidate the theories and science to improve understanding of the issues. Finally, we highlight the current challenges on the subject and provide some suggestions for future research.
Zhang WeniD; Qi Zhu; HongBin Zhan; Guanhua Huang; Quanrong Wang. A Critical Review of non-Darcian Flow and Future Challenges. 2020, 1 .
AMA StyleZhang WeniD, Qi Zhu, HongBin Zhan, Guanhua Huang, Quanrong Wang. A Critical Review of non-Darcian Flow and Future Challenges. . 2020; ():1.
Chicago/Turabian StyleZhang WeniD; Qi Zhu; HongBin Zhan; Guanhua Huang; Quanrong Wang. 2020. "A Critical Review of non-Darcian Flow and Future Challenges." , no. : 1.
Vadose zone has been proven as an essential buffer zone for aquifer recharge. However, most previous researches associated with vadose zone influence of groundwater recharge concern granular porous media aquifers. Despite of the massive karst formations on surface of earth, the role of karst vadose zone on affecting recharge to the underneath karst aquifer is largely unknown. The objective of this study is to conceptualize and understand the influence of a thick karst vadose zone on groundwater recharge in a regional karst formation. In this work, an integrated field and numerical investigation on such a thick vadose zone above the regional karst aquifer is conducted, where the field component of the investigation involves survey and observation of hydraulic heads and spring discharge, and the numerical component of the investigation involves coupled unsaturated-saturated modeling exercises. The numerical simulation works are conducted by building the following three models: Model 1, a coupled saturated-unsaturated model; Model 2, a coupled saturated-unsaturated model without preferential infiltration; Model 3, a saturated flow model without vadose zone process. The influence of the vadose zone on groundwater recharge is analyzed by comparing the results of those three models. The comparison results of the spring discharge/groundwater level-time curves show that in karst area with a thick vadose zone like the study area, considering vadose zone will improve the simulation results significantly and the slow (diffusive) flow plays a major role in controlling groundwater recharge. The comparison of the recharge-time curves shows that the thick karst vadose zone has a significant buffer effect on pattern and timing of recharge. Parameters of the vadose zone, which controls the infiltration process, are analyzed and prioritized. Our analysis suggests that the infiltration rate has a great influence on groundwater recharge and the specific yield of the deep seated unconfined aquifer affects not only the amount of recharge but also its time lag.
Ruitong Liu; Jinguo Wang; HongBin Zhan; Zhou Chen; Weijian Li; Dong Yang; Shiyu Zheng. Influence of thick karst vadose zone on aquifer recharge in karst formations. Journal of Hydrology 2020, 592, 125791 .
AMA StyleRuitong Liu, Jinguo Wang, HongBin Zhan, Zhou Chen, Weijian Li, Dong Yang, Shiyu Zheng. Influence of thick karst vadose zone on aquifer recharge in karst formations. Journal of Hydrology. 2020; 592 ():125791.
Chicago/Turabian StyleRuitong Liu; Jinguo Wang; HongBin Zhan; Zhou Chen; Weijian Li; Dong Yang; Shiyu Zheng. 2020. "Influence of thick karst vadose zone on aquifer recharge in karst formations." Journal of Hydrology 592, no. : 125791.
To consider the non-Darcian nature of groundwater flow and the permeability reduction owing to well and aquifer clogging, an Izbash's law-based analytical model with a time-dependent hydraulic conductivity function is proposed for constant-rate recharge and constant-head recharge. By means of linearization approximations, variable substitutions and the Laplace transform, approximate analytical solutions for the model are derived. Comparison of developed approximate analytical solutions with numerical solutions indicates that the approximate solutions are highly accurate except during the short period of initial recharge stage. The proposed model provides a theoretical basis for managed aquifer recharge involving clogging-related permeability reduction and non-Darcian flow.
Jiong Li; Xiao-He Xia; HongBin Zhan; Ming-Guang Li; Jin-Jian Chen. Non-Darcian flow for an artificial recharge well in a confined aquifer with clogging-related permeability reduction. Advances in Water Resources 2020, 147, 103820 .
AMA StyleJiong Li, Xiao-He Xia, HongBin Zhan, Ming-Guang Li, Jin-Jian Chen. Non-Darcian flow for an artificial recharge well in a confined aquifer with clogging-related permeability reduction. Advances in Water Resources. 2020; 147 ():103820.
Chicago/Turabian StyleJiong Li; Xiao-He Xia; HongBin Zhan; Ming-Guang Li; Jin-Jian Chen. 2020. "Non-Darcian flow for an artificial recharge well in a confined aquifer with clogging-related permeability reduction." Advances in Water Resources 147, no. : 103820.
Both theory and application of multispecies reactive transport for in situ groundwater bioremediation involving a vertical circulation well (VCW) are not fully understood despite its importance and common usage in aquifer remediation practices. This study proposes novel approaches including two methods for design and remediation prediction of a VCW system, which involves multispecies, multiphase and microbially enhanced reactive transport process. One is particle‐tracking method, which depicts the trajectories of particles released from an injection chamber; the other is node‐dependent finite difference (NDFD) method, which describes the advection‐dispersion process based on the inflow and outflow directions at each node. The numerical results demonstrate that the particle‐tracking method works well by yielding a useful index, i.e., the recovery ratio, which helps optimize the in situ preliminary remediation screening. When biochemical parameters, dispersivities and in situ contaminated conditions are known after the preliminary screening, the NDFD method performs better than the conventional Laplace transform finite difference method in terms of describing multispecies reactive transport with multiple phases in a VCW system. The proposed particle‐tracking method and NDFD methods are employed to elucidate different effects of factors such as injection mode, hydraulic conductivity anisotropy ratio, distance between injection and extraction screened intervals and injection/extraction rate on recovery and removal ratios. Our findings suggest that both methods are effective tools for optimization and prediction of VCW remediation in an anisotropic aquifer.
Qi Zhu; Zhang Wen; HongBin Zhan; Songhu Yuan. Optimization Strategies for in Situ Groundwater Remediation by a Vertical Circulation Well Based on Particle‐Tracking and Node‐Dependent Finite Difference Methods. Water Resources Research 2020, 56, 1 .
AMA StyleQi Zhu, Zhang Wen, HongBin Zhan, Songhu Yuan. Optimization Strategies for in Situ Groundwater Remediation by a Vertical Circulation Well Based on Particle‐Tracking and Node‐Dependent Finite Difference Methods. Water Resources Research. 2020; 56 (11):1.
Chicago/Turabian StyleQi Zhu; Zhang Wen; HongBin Zhan; Songhu Yuan. 2020. "Optimization Strategies for in Situ Groundwater Remediation by a Vertical Circulation Well Based on Particle‐Tracking and Node‐Dependent Finite Difference Methods." Water Resources Research 56, no. 11: 1.
Soil water moisture is one of the most important influencing factors in the fragile ecosystems in arid sandy regions, and it serves as a bridge connecting the rainfall and groundwater, two important water sources in arid sandy regions. The hydrological process of an arid sandy region occurs sporadically and is highly non-uniform temporally, making it difficult to monitor and predict. The deep soil recharge (DSR) at a sufficiently deep soil layer (usually greater than 200 cm below ground surface) is an important indicator for groundwater recharge in the arid sandy region, and thus the quantitative determination of DSR is of great significance to the evaluation of water resources and the study of water balance in the arid sandy region. Due to the large amount of evaporation, small amount of precipitation, and the long term of the frozen-soil period in the winter and spring, the monitoring of infiltration and determination of DSR in the arid sandy region become challenging. This study selects the Ulanbuh desert plots in northern China to monitor DSR, precipitation and seasonal frozen soil thickness change, and reaches the following conclusions: Even though the annual precipitation is only 48.2 mm in the arid sandy region, DSR will still occur and replenish groundwater. The daily threshold of precipitation for generating measurable DSR is lower than 4 mm, where the DSR value is defined as the downward flux over a unit area per day hereinafter. DSR continues during the frozen period of the winter and spring seasons, and it is generated from water vapor transport and condensation in the deep sandy layer. Summer rainstorms do no show an obvious correlation with DSR, which is unexpected. This study reveals the characteristics of the dynamic water resources movement and transformation in the arid sandy area in Ulanbuh Desert and can serve as an important guideline for the quantitative assessment of water resources in arid sandy regions.
YiBen Cheng; Wenbin Yang; HongBin Zhan; Qunou Jiang; Mingchang Shi; Yunqi Wang. On the Origin of Deep Soil Water Infiltration in the Arid Sandy Region of China. Water 2020, 12, 2409 .
AMA StyleYiBen Cheng, Wenbin Yang, HongBin Zhan, Qunou Jiang, Mingchang Shi, Yunqi Wang. On the Origin of Deep Soil Water Infiltration in the Arid Sandy Region of China. Water. 2020; 12 (9):2409.
Chicago/Turabian StyleYiBen Cheng; Wenbin Yang; HongBin Zhan; Qunou Jiang; Mingchang Shi; Yunqi Wang. 2020. "On the Origin of Deep Soil Water Infiltration in the Arid Sandy Region of China." Water 12, no. 9: 2409.
The model of single-well push–pull (SWPP) test has been widely used to investigate reactive radial dispersion in remediation or parameter estimation of in situ aquifers. Previous analytical solutions only focused on a completely isolated aquifer for the SWPP test, excluding any influence of aquitards bounding the tested aquifer, and ignored the wellbore storage of the chaser and rest phases in the SWPP test. Such simplification might be questionable in field applications when test durations are relatively long because solute transport in or out of the bounding aquitards is inevitable due to molecular diffusion and cross-formational advective transport. Here, a new SWPP model is developed in an aquifer–aquitard system with wellbore storage, and the analytical solution in the Laplace domain is derived. Four phases of the test are included: the injection phase, the chaser phase, the rest phase and the extraction phase. As the permeability of the aquitard is much smaller than the permeability of the aquifer, the flow is assumed to be perpendicular to the aquitard; thus only vertical dispersive and advective transports are considered for the aquitard. The validity of this treatment is tested against results grounded in numerical simulations. The global sensitivity analysis indicates that the results of the SWPP test are largely sensitive (i.e., influenced by) to the parameters of porosity and radial dispersion of the aquifer, whereas the influence of the aquitard on results could not be ignored. In the injection phase, the larger radial dispersivity of the aquifer could result in the smaller values of breakthrough curves (BTCs), while there are greater BTC values in the chaser and rest phases. In the extraction phase, it could lead to the smaller peak values of BTCs. The new model of this study is a generalization of several previous studies, and it performs better than previous studies ignoring the aquitard effect and wellbore storage for interpreting data of the field SWPP test reported by Yang et al. (2014).
Quanrong Wang; Junxia Wang; HongBin Zhan; Wenguang Shi. New model of reactive transport in a single-well push–pull test with aquitard effect and wellbore storage. Hydrology and Earth System Sciences 2020, 24, 3983 -4000.
AMA StyleQuanrong Wang, Junxia Wang, HongBin Zhan, Wenguang Shi. New model of reactive transport in a single-well push–pull test with aquitard effect and wellbore storage. Hydrology and Earth System Sciences. 2020; 24 (8):3983-4000.
Chicago/Turabian StyleQuanrong Wang; Junxia Wang; HongBin Zhan; Wenguang Shi. 2020. "New model of reactive transport in a single-well push–pull test with aquitard effect and wellbore storage." Hydrology and Earth System Sciences 24, no. 8: 3983-4000.