Abstract
Bed load transport is an important process in maintaining balance and stabilising channel geometry for restoring the form and function of river ecosystems. The amount and spatial distribution of bed load sediment particles contribute significantly to riverbed level changes. The prediction of bed load sediment transport evolution is an important aspect of catchment planning. This work can be effectively supported through numerical simulation by detailed analyses of flow components and sediment transport inside watersheds. The purpose of this research is to develop a twodimensional depth-averaged numerical model for flow and sediment transport using eight bed load transport equations to predict the time variation of bed deformation in steep slope, torrents and mountain river areas. The two-dimensional depth-averaged shallow water equations, along with the sediment continuity equation, are solved by using the Marker and Cell explicit scheme. Applying the eight bed load transport formulas to both ADM and MLSHM experimental flumes. After we will choice to the most appropriate formula to simulate the bed load transport rate and bed elevation change in the Yang yang mountains river in South Korea. The differences found between the measured experimental data and the numerical simulation for both flow and the time variations of bed deformation showed that the numerical model used in this research is useful for the analysis and prediction of riverbed level variations.
Highlights
Bed load transport is the physical process of shaping riverbeds and affects both the form and function of many hydraulic structures in river ecosystems
The aim of this study is to find a bed load transport formula that is suitable for bed load transport rate computation in steep slope areas, torrents and mountain river areas
This study uses different bed load transport formulas to estimate the rate of bed load sediment transport in open channels, to simulate riverbed level variations in a wide range of practical shallow open channel situations and to identify the optimum bed load transport formula to improve the accuracy and applicability of the calculation
Summary
Bed load transport is the physical process of shaping riverbeds and affects both the form and function of many hydraulic structures in river ecosystems. Most of the bed load transport equations have been conducted based only on limited laboratory scale experiments for the specific conditions in which they were developed or field conditions [11,12,13,14,15,16,17,18,19,20] For this reason, some limitations to the universal application still exist. Flexibility in designing for different plans, the ability to simulate river bed variations under large scale and long-term conditions, and providing a large quantity of useful information are a few of the reasons that numerical modelling is good choice for research.
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