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United States Department of Agriculture

Agricultural Research Service

Research Project: Integrated Strategies for Improved Water Quality and Ecosystem Integrity within Agricultural Watersheds

Location: Water Quality and Ecology Research

Title: Numerical modeling of overland flow due to rainfall-runoff

Author
item Shirmeen, Tahmina
item Yafei, Jia
item Locke, Martin

Submitted to: Proceedings of the World Environmental and Water Resources Congress Conference
Publication Type: Abstract Only
Publication Acceptance Date: 10/29/2014
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Runoff is a basic hydrologic process that can be influenced by management activities in agricultural watersheds. Better description of runoff patterns through modeling will help to understand and predict watershed sediment transport and water quality. Normally, runoff is studied with kinematic wave models, but this approach cannot be applied to other type of flows. In this study, CCHE2D, a numerical model for general hydrodynamics, is applied to study the runoff and channel flow mixed problem. The model capability is tested using both analytical solutions and experimental data to simulate the rainfall generated runoff processes on impervious surfaces. Comparison of numerical solutions of the flow model with both analytic solutions and observed overland flows resulting from unsteady rainfalls and spatial variation of surface roughness is satisfactory. The model is then applied to real world scenarios: an agricultural watershed in the North-western part of the Mississippi Delta. Rainfall and flow discharge data were used to compare with the simulation results. Detailed results and comparisons will be reported with full paper to the conference.

Last Modified: 06/28/2017
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