scholarly journals Numerical Analysis of Channel Processes Using a Non-Equilibrium Sediment Transport Model for the Bank Erosion

1997 ◽  
Vol 41 ◽  
pp. 889-894 ◽  
Author(s):  
Nobuhisa NAGATA ◽  
Takashi HOSODA ◽  
Yoshio MURAMOTO ◽  
Munsur RAHMAN
Keyword(s):  
Numerical Analysis ◽  
Sediment Transport ◽  
Transport Model ◽  
Bank Erosion ◽  
Channel Processes ◽  
Sediment Transport Model ◽  
Non Equilibrium

scholarly journals A non-equilibrium sediment transport model for rill erosion

2007 ◽  
Vol 21 (8) ◽  
pp. 1074-1084 ◽  
Author(s):  
Q. Q. Liu ◽  
L. Chen ◽  
J. C. Li ◽  
V. P. Singh
Keyword(s):  
Sediment Transport ◽  
Transport Model ◽  
Rill Erosion ◽  
Sediment Transport Model ◽  
Non Equilibrium

scholarly journals Contributions of catchment and in-stream processes to suspended sediment transport in a dominantly groundwater-fed catchment

2018 ◽  
Vol 22 (7) ◽  
pp. 3903-3921 ◽  
Author(s):  
Yan Liu ◽  
Christiane Zarfl ◽  
Nandita B. Basu ◽  
Marc Schwientek ◽  
Olaf A. Cirpka
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Urban Areas ◽  
Transport Model ◽  
Bank Erosion ◽  
Main Stem ◽  
Shear Stresses ◽  
Sediment Transport Model ◽  
Bed Erosion ◽  
River Hydraulics

Abstract. Suspended sediments impact stream water quality by increasing the turbidity and acting as a vector for strongly sorbing pollutants. Understanding their sources is of great importance to developing appropriate river management strategies. In this study, we present an integrated sediment transport model composed of a catchment-scale hydrological model to predict river discharge, a river-hydraulics model to obtain shear stresses in the channel, a sediment-generating model, and a river sediment-transport model. We use this framework to investigate the sediment contributions from catchment and in-stream processes in the Ammer catchment close to Tübingen in southwestern Germany. The model is calibrated to stream flow and suspended-sediment concentrations. We use the monthly mean suspended-sediment load to analyze seasonal variations of different processes. The contributions of catchment and in-stream processes to the total loads are demonstrated by model simulations under different flow conditions. The evaluation of shear stresses by the river-hydraulics model allows the identification of hotspots and hot moments of bed erosion for the main stem of the Ammer River. The results suggest that the contributions of suspended-sediment loads from urban areas and in-stream processes are higher in the summer months, while deposition has small variations with a slight increase in summer months. The sediment input from agricultural land and urban areas as well as bed and bank erosion increase with an increase in flow rates. Bed and bank erosion are negligible when flow is smaller than the corresponding thresholds of 1.5 and 2.5 times the mean discharge, respectively. The bed-erosion rate is higher during the summer months and varies along the main stem. Over the simulated time period, net sediment trapping is observed in the Ammer River. The present work is the basis to study particle-facilitated transport of pollutants in the system, helping to understand the fate and transport of sediments and sediment-bound pollutants.

scholarly journals A Novel Slope Failure Operator for a Non-Equilibrium Sediment Transport Model

10.29007/3rtl ◽  
2018 ◽  
Author(s):  
Jiaheng Zhao ◽  
Ilhan Özgen ◽  
Dongfang Liang ◽  
Reinhard Hinkelmann
Keyword(s):  
Sediment Transport ◽  
Slope Failure ◽  
Transport Model ◽  
Computational Cost ◽  
Measurement Data ◽  
Bank Failure ◽  
Total Load ◽  
Model Based ◽  
Sediment Transport Model ◽  
Non Equilibrium

Complex transport mechanism and interaction between fluid and sediment make the mathematical and numerical modeling of sediment transport very challenging. Different types of models can lead to different results. This paper investigates a non-equilibrium sediment transport model based on the total load. In this type of model, it is assumed that a bed slide will occur if the bed slope reaches a critical angle. This is enabled by means of a slope failure operator. Existing slope failure operators usually suffer from the high computational cost and may fail at wet/dry interfaces. The main contribution of this work is the development of a novel slope failure operator for the total load transport model, based on a modified mass balance approach. The proposed approach is verified in three test cases, involving bank failure, dyke overtopping and a two-dimensional bank failure. It is shown that the proposed approach yields good agreement with analytical results and measurement data.

scholarly journals A Process-Based, Fully Distributed Soil Erosion and Sediment Transport Model for WRF-Hydro

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1840
Author(s):  
Dongxiao Yin ◽  
Z. George Xue ◽  
David J. Gochis ◽  
Wei Yu ◽  
Mirce Morales ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Soil Erosion ◽  
Transport Model ◽  
Model Performance ◽  
Sediment Concentration ◽  
Rain Gauge ◽  
Channel Processes ◽  
Concentration Data ◽  
Rainfall Events ◽  
Sediment Transport Model

A soil erosion and sediment transport model (WRF-Hydro-Sed) is introduced to WRF-Hydro. As a process-based, fully distributed soil erosion model, WRF-Hydro-Sed accounts for both overland and channel processes. Model performance is evaluated using observed rain gauge, streamflow, and sediment concentration data during rainfall events in the Goodwin Creek Experimental Watershed in Mississippi, USA. Both streamflow and sediment yield can be calibrated and validated successfully at a watershed scale during rainfall events. Further discussion reveals the model’s uncertainty and the applicability of calibrated hydro- and sediment parameters to different events. While an intensive calibration over multiple events can improve the model’s performance to a certain degree compared with single event-based calibration, it might not be an optimal strategy to carry out considering the tremendous computational resources needed.

scholarly journals Contributions of Catchment and In-Stream Processes to Suspended Sediment Transport in a Dominantly Groundwater-Fed Catchment

2018 ◽  
Author(s):  
Yan Liu ◽  
Christiane Zarfl ◽  
Nandita B. Basu ◽  
Marc Schwientek ◽  
Olaf A. Cirpka
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Transport Model ◽  
Bank Erosion ◽  
Main Stem ◽  
Suspended Sediment Transport ◽  
Shear Stresses ◽  
Sediment Transport Model ◽  
Bed Erosion ◽  
River Hydraulics

Abstract. Suspended sediments impact stream water quality by increasing the turbidity and acting as a vector for strongly sorbing pollutants. Understanding their sources is of great importance to develop appropriate river management strategies. In this study, we present an integrated sediment transport model composed of a catchment-scale hydrological model to predict river discharge, a river-hydraulics model to obtain shear stresses in the channel, a sediment-generating model, and a river sediment-transport model. We use this framework to investigate the sediment contributions from catchment and in-stream processes in the Ammer catchment close to Tübingen in South-West Germany. The model is calibrated to stream flow and suspended-sediment concentrations. We use the monthly mean suspended-sediment load to analyze seasonal variations of different processes. The contributions of catchment and in-stream processes to the total loads are demonstrated by model simulations under different flow conditions. The evaluation of shear stresses by the river-hydraulics model allows identifying hotspots and hot moments of bed erosion for the main stem of the Ammer River. The results suggest that the contributions of suspended-sediment loads from urban areas and in-stream processes are higher in the summer months, while deposition has small variations with a slight increase in summer months. The catchment input, bed erosion, and bank erosion increase with an increase in flow rates. Bed erosion and bank erosion are negligible when flow is smaller than the corresponding thresholds of 1.5 m3 s−1 and 2.5 m3 s−1, respectively. The bed-erosion rate is higher during the summer months and varies along the main stem. Over the simulated time period, net sediment trapping is observed in the Ammer River. The present work is the basis to study particle-facilitated transport of pollutants in the system, helping to understand fate and transport of sediments and sediment-bound pollutants.

scholarly journals A Non-Equilibrium Sediment Transport Model for Dam Break Flow over Moveable Bed Based on Non-Uniform Rectangular Mesh

Water ◽  
2018 ◽  
Vol 10 (5) ◽  
pp. 616 ◽  
Author(s):  
Gangfeng Wu ◽  
Zhehao Yang ◽  
Kefeng Zhang ◽  
Ping Dong ◽  
Ying-Tien Lin
Keyword(s):  
Sediment Transport ◽  
Transport Model ◽  
Dam Break ◽  
Sediment Transport Model ◽  
Rectangular Mesh ◽  
Dam Break Flow ◽  
Non Equilibrium
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