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Surface erosion equation approach using energy principles
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|Title: ||Surface erosion equation approach using energy principles|
|Authors: ||Shih, Hui-Ming|
Yang, Chih Ted
|Keywords: ||Sediment transport|
|Issue Date: ||11-Sep-2006 |
|Publisher: ||Michael Piasecki and College of Engineering, Drexel University|
|Citation: ||Proceedings of the Seventh International Conference on Hydroscience and Engineering, Philadelphia, PA, September 2006. http://hdl.handle.net/1860/732|
|Abstract: ||Soil erosion in a watershed caused by water flow is a complex problem. Water flow in a watershed can cause hill slope erosion or land slide, debris flow erosion, and surface soil erosion. Surface erosion materials consist mainly of sand, silt, and clay. Surface soil erosion is an integrated process of rainfall splash detachment, sheet flow erosion, inter-rill flow erosion and rill flow erosion. Both empirical and physically based approaches were used for the estimation of surface erosion rates. Their applications are mainly limited to small drainage areas or laboratory studies. This study will present a physically based model with the computed results verified by published laboratory and field experiment data.
Bed load sediment transport formulas were recommended by Graf (1971), Foster and Meyer (1972, 1975) and Gilley (1985) for the estimation of surface erosion rate. Factors and mechanics of surface erosion were reviewed by Julien and Simons (1985) and Prosser and Rustomji (2000). This study will use variational mechanics based on energy dissipation rate or unit stream power to estimate erosion rate caused by overland flows. The coefficients used in the model will be calibrated by published laboratory data. Laboratory date used in the study include those published by Kilinc (1972), Gover (1985), Aziz and Scott (1989), and Guy (1990).
In the study, the physically based soil erosion equations are developed using non-linear regression method. Their computed results and laboratory data agree with each other very well. A one dimensional overland flow diffusion wave model is used in conjunction with the soil erosion equation to simulate field experiment results (Barfield et al., 1983). The study concludes that the unit stream power method not only is a powerful tool for the analysis of sediment transport in alluvial channels but also performs well for the analysis of overland flow erosion processes.|
|Description: ||Paper presented at The Seventh International Conference on HydroScience and Engineering (ICHE) hosted by the College of Engineering at Drexel Univeristy on September 10-13, 2006 in Philadelphia, Pennsylvania. The conference theme was IT in the Field of HydroSciences. It included several mini-symposia that emphasized IT topics in HydroSciences and the yearly meeting of the metadata group of the International Oceanographic Data and Information Exchange organization.|
|Appears in Collections:||Proceedings of the 7th International Conference on HydroScience and Engineering (ICHE 2006) [ISBN: 0977447405]|
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