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Haixiao Jing
State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an 710048, China

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Research article
Published: 04 March 2021 in Advances in Materials Science and Engineering
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The local reconstruction of river channels may pose obstacles of flood flow, local eddy currents, or high flow velocity which pose potential threats to human life and infrastructures nearby. In the design of such projects, the effects of local reconstruction of the river channel on flooding are often evaluated by the one-dimensional method, which is based on the formula of one-dimensional nonuniform flow. In this study, a two-dimensional hydrodynamic model based on shallow water equations is employed to investigate the impacts of river reconstruction on flooding in the Ba River, China. The finite volume method and an unstructured triangular mesh are used to solve the governing equations numerically. The numerical model is validated by comparison with the results of a physical model of 1 : 120 scale. The backwater effects and impacts of flood flow fields under two flood frequencies are analyzed by comparing the numerical results before and after local reconstruction. The results show that the backwater length under both 10-year and 100-year floods can be reached up to the upstream boundary of the computational domain. However, the maximum water level rises are limited, and the levees in this river channel are safe enough. The flow velocity fields under both floods are changed obviously after local reconstruction in the Ba River. Areas with the potential for scour and deposition of the river bed are also pointed out. The findings of this study are helpful for the evaluation of flood risks of the river.

ACS Style

Haixiao Jing; Yongbiao Lang; Xinhong Wang; Mingyang Yang; Zongxiao Zhang. Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China. Advances in Materials Science and Engineering 2021, 2021, 1 -10.

AMA Style

Haixiao Jing, Yongbiao Lang, Xinhong Wang, Mingyang Yang, Zongxiao Zhang. Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China. Advances in Materials Science and Engineering. 2021; 2021 ():1-10.

Chicago/Turabian Style

Haixiao Jing; Yongbiao Lang; Xinhong Wang; Mingyang Yang; Zongxiao Zhang. 2021. "Numerical Simulation of Effects of River Reconstruction on Flooding: A Case Study of the Ba River, China." Advances in Materials Science and Engineering 2021, no. : 1-10.

Original paper
Published: 04 June 2020 in Natural Hazards
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In this study, we developed three solutions with different degrees of dispersion for an idealized model where the landslide moves along a flat bottom; this was to elucidate the effects of landslide acceleration on the dispersive property of the generated water waves. Both free surface elevations and velocity profiles are obtained with their integral forms for the three solutions. Based on the derivations of the solutions, it is found theoretically that landslide acceleration can cause the generated water waves to be dispersive. Numerical integrations are carried out by using the extended trapezoidal rule and the solutions are validated by comparison with the available experimental results. Case studies are carried out by the three models, and the results show that the amplitude of water waves increases with the increase in landslide acceleration. Evident dispersive effects caused by the landslide acceleration can be found, especially with the increase in water depth. This confirms the theoretical findings in this study. In addition, the wide range of applications of these three solutions are indicated.

ACS Style

Haixiao Jing; Guoding Chen; Changgen Liu; Wen Wang; Juanli Zuo. Dispersive effects of water waves generated by submerged landslide. Natural Hazards 2020, 103, 1917 -1941.

AMA Style

Haixiao Jing, Guoding Chen, Changgen Liu, Wen Wang, Juanli Zuo. Dispersive effects of water waves generated by submerged landslide. Natural Hazards. 2020; 103 (2):1917-1941.

Chicago/Turabian Style

Haixiao Jing; Guoding Chen; Changgen Liu; Wen Wang; Juanli Zuo. 2020. "Dispersive effects of water waves generated by submerged landslide." Natural Hazards 103, no. 2: 1917-1941.

Journal article
Published: 13 March 2020 in Journal of Marine Science and Engineering
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Understanding the propagation of landslide-generated water waves is of great help against tsunami hazards. In order to investigate the effects of landslide shapes on the far-field leading wave generated by a submerged landslide at a constant depth, three linear wave models with different degrees of dispersive properties are employed in this study. The linear fully dispersive model is then validated by comparing the results against the experimental data available for landslides with a low Froude number. Three simplified shapes of landslides with the same volume, which are unnatural for a body of incoherent material, are used to investigate the effects of landslide shapes on the far-field properties of the generated leading wave over a flat seabed. The results show that the far-field leading crest over a constant depth is independent of the exact landslide shape and is invalid at a shallow water depth. Therefore, the most popular non-dispersive model (also called the shallow water wave model) cannot be used to reproduce the phenomenon. The weakly dispersive wave model can predict this phenomenon well. If only the leading wave is considered, this model is accurate up to at least μ = h0/Lc = 0.6, where h0 is the water depth and Lc denotes the characteristic length of the landslide.

ACS Style

Haixiao Jing; Yanyan Gao; Changgen Liu; Jingming Hou. Far-Field Characteristics of Linear Water Waves Generated by a Submerged Landslide over a Flat Seabed. Journal of Marine Science and Engineering 2020, 8, 196 .

AMA Style

Haixiao Jing, Yanyan Gao, Changgen Liu, Jingming Hou. Far-Field Characteristics of Linear Water Waves Generated by a Submerged Landslide over a Flat Seabed. Journal of Marine Science and Engineering. 2020; 8 (3):196.

Chicago/Turabian Style

Haixiao Jing; Yanyan Gao; Changgen Liu; Jingming Hou. 2020. "Far-Field Characteristics of Linear Water Waves Generated by a Submerged Landslide over a Flat Seabed." Journal of Marine Science and Engineering 8, no. 3: 196.

Journal article
Published: 29 September 2019 in Water
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High-speed and accurate simulations of landslide-generated tsunamis are of great importance for the understanding of generation and propagation of water waves and for prediction of these natural disasters. A three-dimensional numerical model, based on Reynolds-averaged Navier–Stokes equations, is developed to simulate the landslide-generated tsunami. Available experiment data is used to validate the numerical model and to investigate the scale effect of numerical model according to the Froude similarity criterion. Based on grid convergence index (GCI) analysis, fourteen cases are arranged to study the sensitivity of numerical results to mesh resolution. Results show that numerical results are more sensitive to mesh resolution in near field than that in the propagation field. Nonuniform meshes can be used to balance the computational efficiency and accuracy. A mesh generation strategy is proposed and validated, achieving an accurate prediction and nearly 22 times reduction of computational cost. Further, this strategy of mesh generation is applied to simulate the Laxiwa Reservoir landslide tsunami. The results of this study provide an important guide for the establishment of a numerical model of the real-world problem of landslide tsunami.

ACS Style

Guodong Li; Guoding Chen; Pengfeng Li; Haixiao Jing. Efficient and Accurate 3-D Numerical Modelling of Landslide Tsunami. Water 2019, 11, 2033 .

AMA Style

Guodong Li, Guoding Chen, Pengfeng Li, Haixiao Jing. Efficient and Accurate 3-D Numerical Modelling of Landslide Tsunami. Water. 2019; 11 (10):2033.

Chicago/Turabian Style

Guodong Li; Guoding Chen; Pengfeng Li; Haixiao Jing. 2019. "Efficient and Accurate 3-D Numerical Modelling of Landslide Tsunami." Water 11, no. 10: 2033.

Journal article
Published: 05 June 2019 in Water
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Bridge piers on river channels can cause obstacles for flood flow by reducing the cross-sectional area and inducing local eddy currents and high flow velocities, which may destroy hydraulic structures. A two-dimensional numerical model was used to investigate the effects of bridge piers on river flood hazards in the Jialing River, China. For the modeling, Mike 21 FM was used, which is an unstructured mesh and finite volume model that solves the shallow water equations. The numerical model was validated with collected historical flood traces, and sensitivity analyses identified the effects of the Manning coefficient and the dependence on the grid size. The influence of backwater effects on the flow field was analyzed by comparing numerical results with and without piers. The results showed that the most significant impacts were caused by the Fengxian Bridge. The maximum water level rise was about 1 m and the maximum velocity near this bridge decreased by 22.77% for a 10-year flood. We found that the top elevations of planned levees near the bridges must be increased by 0.15–0.36 m. The influence of bridge piers on the flood velocity field is more complex. These findings will help flood hazard management in this river and provides a reference for similar projects.

ACS Style

Wen Wang; Kaibo Zhou; Haixiao Jing; Juanli Zuo; Peng Li; Zhanbin Li; Wang; Zhou; Jing; Zuo; Li. Effects of Bridge Piers on Flood Hazards: A Case Study on the Jialing River in China. Water 2019, 11, 1181 .

AMA Style

Wen Wang, Kaibo Zhou, Haixiao Jing, Juanli Zuo, Peng Li, Zhanbin Li, Wang, Zhou, Jing, Zuo, Li. Effects of Bridge Piers on Flood Hazards: A Case Study on the Jialing River in China. Water. 2019; 11 (6):1181.

Chicago/Turabian Style

Wen Wang; Kaibo Zhou; Haixiao Jing; Juanli Zuo; Peng Li; Zhanbin Li; Wang; Zhou; Jing; Zuo; Li. 2019. "Effects of Bridge Piers on Flood Hazards: A Case Study on the Jialing River in China." Water 11, no. 6: 1181.

Original article
Published: 27 July 2018 in Environmental Earth Sciences
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In this study, non-equilibrium transport of suspended sediment from one equilibrium state to another is investigated. Based on a convective-diffusion equation, a numerical model for flow with suspended sediment is developed by considering the effect of concentration-dependent settling velocity. The numerical model is validated by comparing analytical solutions and experimental results. The concentration profiles, mean concentrations and distance necessary to reach a new equilibrium state are examined by comparing them with the results of constant settling velocity. For a high concentration flow, the results indicate that evident differences between the above three indicators can be determined with and without concentration-dependent settling velocity. Additionally, the effects of concentration-dependent settling velocity are sensitive to the sediment mobility parameter (or Rouse number), although they are nearly independent of the diffusion Reynolds number.

ACS Style

Haixiao Jing; Guoding Chen; Wen Wang; Guodong Li. Effects of concentration-dependent settling velocity on non-equilibrium transport of suspended sediment. Environmental Earth Sciences 2018, 77, 549 .

AMA Style

Haixiao Jing, Guoding Chen, Wen Wang, Guodong Li. Effects of concentration-dependent settling velocity on non-equilibrium transport of suspended sediment. Environmental Earth Sciences. 2018; 77 (15):549.

Chicago/Turabian Style

Haixiao Jing; Guoding Chen; Wen Wang; Guodong Li. 2018. "Effects of concentration-dependent settling velocity on non-equilibrium transport of suspended sediment." Environmental Earth Sciences 77, no. 15: 549.