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Prof. yi xiao
Chongqingjiaotong University

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0 Hydrology
0 Navigation Design
0 sedimentation analysis
0 bed load transport
0 River dynamics

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Original paper
Published: 24 April 2021 in Arabian Journal of Geosciences
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Since the Three Gorges Dam began operation in 2003, hydrodynamic-sediment conditions changes have occurred not only downstream but also in the Three Gorges Reservoir, contributing to variations in the navigation conditions of the backwater area. Based on the measured channel data from 2003 to 2018, this study investigates changes in the waterway dimension and the factors that impact navigation conditions. The navigation-obstructing channels in the permanent backwater area (PBA) mainly resulted from the occurrence of fine grained sedimentation, which led to a decrease in the effective navigable width. Meanwhile, in the fluctuating backwater area (FBA), bed load behavior during the falling stage from April to June lowered navigation depths. Decreasing sediment supply can alleviate reservoir sedimentation and maintain navigation safety in the PBA, while it is necessary to focus on the waterway depth clearance that is sensitive to temporary deposition during the falling stage of high water-sediment discharge years in the FBA. Water level variation near gravel excavation pits indicates that sediment mining decreases waterway depth, negatively impacting the navigable dimension, especially during low water discharge. These findings provide useful information for assessing the sustainable development of the navigation in the Three Gorges Reservoir, and aid economic development in the Yangtze River.

ACS Style

Yi Xiao; Wenjie Li; Shengfa Yang. Hydrodynamic-sediment transport response to waterway depth in the Three Gorges Reservoir, China. Arabian Journal of Geosciences 2021, 14, 1 -17.

AMA Style

Yi Xiao, Wenjie Li, Shengfa Yang. Hydrodynamic-sediment transport response to waterway depth in the Three Gorges Reservoir, China. Arabian Journal of Geosciences. 2021; 14 (9):1-17.

Chicago/Turabian Style

Yi Xiao; Wenjie Li; Shengfa Yang. 2021. "Hydrodynamic-sediment transport response to waterway depth in the Three Gorges Reservoir, China." Arabian Journal of Geosciences 14, no. 9: 1-17.

Review
Published: 11 March 2020 in Water
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The self-adjustment of an alluvial channel is a complicated process with various factors influencing the stability and transformation of channel patterns. A cusp catastrophe model for the alluvial channel regime is established by selecting suitable parameters to quantify the channel pattern and stability. The channel patterns can be identified by such a model in a direct way with a quantified index, which is a 2D projection of the cusp catastrophe surface, and the discriminant function is obtained from the model to distinguish the river state. Predictions based on this model are consistent with the field observations involving about 150 natural rivers of small or medium sizes. This new approach enables us to classify the channel pattern and determine a river stability state, and it paves the way toward a better understanding of the regime of natural rivers to assist decision-making in river management.

ACS Style

Yi Xiao; Shengfa Yang; John Williams; Fiona Nicholson; Rikke Krogshave Laursen; Rachel Cassidy; Luke Farrow; Linda Tendler; Nicolas Surdyk; Gerard Velthof. A Cusp Catastrophe Model for Alluvial Channel Pattern and Stability. Water 2020, 12, 780 .

AMA Style

Yi Xiao, Shengfa Yang, John Williams, Fiona Nicholson, Rikke Krogshave Laursen, Rachel Cassidy, Luke Farrow, Linda Tendler, Nicolas Surdyk, Gerard Velthof. A Cusp Catastrophe Model for Alluvial Channel Pattern and Stability. Water. 2020; 12 (3):780.

Chicago/Turabian Style

Yi Xiao; Shengfa Yang; John Williams; Fiona Nicholson; Rikke Krogshave Laursen; Rachel Cassidy; Luke Farrow; Linda Tendler; Nicolas Surdyk; Gerard Velthof. 2020. "A Cusp Catastrophe Model for Alluvial Channel Pattern and Stability." Water 12, no. 3: 780.

Journal article
Published: 21 February 2020 in Water
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An experimental apparatus driven by horizontal oscillating grids in a water tank is proposed for generating shear-free turbulence, which is measured using Particle Image Velocimetry (PIV). The performances of the proposed apparatus are investigated through the instantaneous and root-mean-square (RMS) velocity, Reynolds stress, length and time scale, frequency spectra and dissipation rate. Results indicate that the turbulence at the core region of the water tank, probably 8 cm in length, is identified to be shear-free. The main advantage of the turbulence driven by horizontal oscillating mode is that the ratios of the longitudinal turbulent intensities to the vertical values are between 1.5 and 2.0, consistent with those ratios in open-channel flows. Additionally, the range of the length scale can span the typical sizes of suspended particles in natural environments, and the dissipation rate also agrees with those found in natural environments. For convenience of experimental use, a formula is suggested to calculate the RMS flow velocity, which is linearly proportional to the product of oscillating stroke and frequency. The proposed experimental method in this study appears to be more appropriate than the traditional vertical oscillating mode for studying the fundamental mechanisms of vertical migratory behavior of suspended particles and contaminants in turbulent flows.

ACS Style

Wenjie Li; Peng Zhang; Shengfa Yang; Xuhui Fu; Yi Xiao. An Experimental Method for Generating Shear-Free Turbulence Using Horizontal Oscillating Grids. Water 2020, 12, 591 .

AMA Style

Wenjie Li, Peng Zhang, Shengfa Yang, Xuhui Fu, Yi Xiao. An Experimental Method for Generating Shear-Free Turbulence Using Horizontal Oscillating Grids. Water. 2020; 12 (2):591.

Chicago/Turabian Style

Wenjie Li; Peng Zhang; Shengfa Yang; Xuhui Fu; Yi Xiao. 2020. "An Experimental Method for Generating Shear-Free Turbulence Using Horizontal Oscillating Grids." Water 12, no. 2: 591.

Journal article
Published: 28 September 2019 in Water
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This paper investigates the transformation mechanism between different channel patterns. A developed 2D depth-averaged numerical model is improved to take into account a bank vegetation stress term in the momentum conservation equation of flow. Then, the extended 2D model is applied to duplicate the evolution of channel pattern with variations in flow discharge, sediment supply and bank vegetation. Complex interaction among the flow discharge, sediment supply and bank vegetation leads to a transition from the braided pattern to the meandering one. Analysis of the simulation process indicates that (1) a decrease in the flow discharge and sediment supply can lead to the transition and (2) the riparian vegetation helps stabilize the cut bank and bar surface, but is not a key in the transition. The results are in agreement with the criterion proposed in the previous research, confirming the 2D numerical model’s potential in predicting the transition between different channel patterns and improving understanding of the fluvial process.

ACS Style

Shengfa Yang; Yi Xiao. 2D Numerical Modeling on the Transformation Mechanism of the Braided Channel. Water 2019, 11, 2030 .

AMA Style

Shengfa Yang, Yi Xiao. 2D Numerical Modeling on the Transformation Mechanism of the Braided Channel. Water. 2019; 11 (10):2030.

Chicago/Turabian Style

Shengfa Yang; Yi Xiao. 2019. "2D Numerical Modeling on the Transformation Mechanism of the Braided Channel." Water 11, no. 10: 2030.

Technical note
Published: 01 August 2019 in Arabian Journal of Geosciences
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The impoundment of the Three Gorges Reservoir (TGR) alters the hydrodynamic conditions and sediment movements related to fluvial sedimentation in the upper stream of the Yangtze River. Based on an extensive dataset of the daily discharge, sediment transport rate, and riverbed level collected from 2003 to 2016 in the TGR area, we applied a Mann–Kendall test, the rescaled range (R/S) analysis method, and 2D numerical modeling to investigate the controls of the temporal–spatial reservoir sedimentation process and their changing trends. The results indicate that (1) the decreasing trends of annual runoff in the upstream of the Yangtze River and its main tributaries are insignificant, and a rapid decrease is not likely to occur, (2) the turning points of the temporal variations in the annual runoff–sediment discharge of the TGR were in 1991 and 2002, (3) the response of the channel pattern to the reservoir sedimentation can be a main factor in controlling the spatial distribution of sedimentation, and (4) an adjustment of the reservoir pool-level can directly influence the sediment processing in the TGR. In the future, dam constructions on the main stem of the Yangtze River and its major tributaries will further decrease the sediment discharge and alleviate sedimentation in the TGR.

ACS Style

Yi Xiao; Wenjie Li; Shengfa Yang. Changing temporal and spatial patterns of fluvial sedimentation in Three Gorges Reservoir, Yangtze River, China. Arabian Journal of Geosciences 2019, 12, 1 -12.

AMA Style

Yi Xiao, Wenjie Li, Shengfa Yang. Changing temporal and spatial patterns of fluvial sedimentation in Three Gorges Reservoir, Yangtze River, China. Arabian Journal of Geosciences. 2019; 12 (15):1-12.

Chicago/Turabian Style

Yi Xiao; Wenjie Li; Shengfa Yang. 2019. "Changing temporal and spatial patterns of fluvial sedimentation in Three Gorges Reservoir, Yangtze River, China." Arabian Journal of Geosciences 12, no. 15: 1-12.

Journal article
Published: 12 July 2019 in Water
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Few researches focus on secondary flow effects on bed deformation caused by cohesive sediment deposition in meandering channels of field mega scale. A 2D depth-averaged model is improved by incorporating three submodels to consider different effects of secondary flow and a module for cohesive sediment transport. These models are applied to a meandering reach of Yangtze River to investigate secondary flow effects on cohesive sediment deposition, and a preferable submodel is selected based on the flow simulation results. Sediment simulation results indicate that the improved model predictions are in better agreement with the measurements in planar distribution of deposition, as the increased sediment deposits caused by secondary current on the convex bank have been well predicted. Secondary flow effects on the predicted amount of deposition become more obvious during the period when the sediment load is low and velocity redistribution induced by the bed topography is evident. Such effects vary with the settling velocity and critical shear stress for deposition of cohesive sediment. The bed topography effects can be reflected by the secondary flow submodels and play an important role in velocity and sediment deposition predictions.

ACS Style

Cuicui Qin; Xuejun Shao; Yi Xiao. Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River. Water 2019, 11, 1444 .

AMA Style

Cuicui Qin, Xuejun Shao, Yi Xiao. Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River. Water. 2019; 11 (7):1444.

Chicago/Turabian Style

Cuicui Qin; Xuejun Shao; Yi Xiao. 2019. "Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River." Water 11, no. 7: 1444.

Preprint
Published: 28 May 2019
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A conventional 2D numerical model is improved by incorporating three submodels to consider different effects of secondary flow and a module for cohesive sediment transport. The model is applied to a meandering reach of Yangtze River to investigate secondary flow effects on cohesive sediment deposition, and a preferable submodel is selected based on the flow simulation results. Sediment simulation results indicate that the improved model predictions are in better agreement with the measurements in planar distribution of deposition as the increased sediment deposits caused by secondary current on the convex bank have been well predicted. Secondary flow effects on predicted amount of deposition become more obvious during the period when the sediment load is low and velocity redistribution induced by the bed topography is evident. Such effects vary with the settling velocity and critical shear stress for deposition of cohesive sediment. The bed topography effects can be reflected by the secondary flow submodels.

ACS Style

Cuicui Qin; Xuejun Shao; Yi Xiao. Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River. 2019, 1 .

AMA Style

Cuicui Qin, Xuejun Shao, Yi Xiao. Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River. . 2019; ():1.

Chicago/Turabian Style

Cuicui Qin; Xuejun Shao; Yi Xiao. 2019. "Secondary Flow Effects on Deposition of Cohesive Sediment in a Meandering Reach of Yangtze River." , no. : 1.

Journal article
Published: 12 March 2016 in Journal of Earth System Science
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A 2D depth-averaged model for hydrodynamic sediment transport and river morphological adjustment was established. The sediment transport submodel takes into account the influence of non-uniform sediment with bed surface armoring and considers the impact of secondary flow in the direction of bed-load transport and transverse slope of the river bed. The bank erosion submodel incorporates a simple simulation method for updating bank geometry during either degradational or aggradational bed evolution. Comparison of the results obtained by the extended model with experimental and field data, and numerical predictions validate that the proposed model can simulate grain sorting in river bends and duplicate the characteristics of meandering river and its development. The results illustrate that by using its control factors, the improved numerical model can be applied to simulate channel evolution under different scenarios and improve understanding of patterning processes.

ACS Style

Y Xiao; G Zhou; F S Yang. 2D numerical modelling of meandering channel formation. Journal of Earth System Science 2016, 125, 251 -267.

AMA Style

Y Xiao, G Zhou, F S Yang. 2D numerical modelling of meandering channel formation. Journal of Earth System Science. 2016; 125 (2):251-267.

Chicago/Turabian Style

Y Xiao; G Zhou; F S Yang. 2016. "2D numerical modelling of meandering channel formation." Journal of Earth System Science 125, no. 2: 251-267.

Journal article
Published: 29 August 2013 in Journal of Hydro-environment Research
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A depth-averaged finite difference two-dimensional hydrodynamic-morphological and sediment transport model is presented in the orthogonal curvilinear grid system. The sediment submodel considers the influence of selective sorting by modifying the sediment transport capacity and incorporates a simple simulation method to describe changes in the grain size distribution of the bed surface by solving the governing equation for sediment mass conservation. The 2D numerical model was applied to the experiment on downstream fining. The model simulation results and the measurements are in acceptable agreement. The result illustrates the capability of the two-dimensional model to predict the sediment wedge evolution and grain sorting process.

ACS Style

Yi Xiao; Hong Wang; Xuejun Shao. 2D numerical modeling of grain-sorting processes and grain size distributions. Journal of Hydro-environment Research 2013, 8, 452 -458.

AMA Style

Yi Xiao, Hong Wang, Xuejun Shao. 2D numerical modeling of grain-sorting processes and grain size distributions. Journal of Hydro-environment Research. 2013; 8 (4):452-458.

Chicago/Turabian Style

Yi Xiao; Hong Wang; Xuejun Shao. 2013. "2D numerical modeling of grain-sorting processes and grain size distributions." Journal of Hydro-environment Research 8, no. 4: 452-458.