Research the Effect of Roughness on the Distribution Overland Runoff Simulation

Abstract:

The slope roughness is a character parameter which shows the blocking effects of earth surface on the overland flow. As a result of the impact of human activities, the land utilization types spatially change rapidly. Consequently, the catchment surface appears as broken patches pattern so that the spatial variation of surface roughness increased. And this leads to change on the runoff flow convergence velocity, the flow direction and the flow assignment in each direction. The accurately runoff simulation is not available when the roughness effect is neglected. Therefore, study on slope roughness effects become important in human activities impacted hydrological research. Based on former researches, we divided the slope roughness research into three levels, and discussed the inappropriate points of the slope runoff flow convergence algorithm, which adopted by the current distributed hydrological model, when dealing with the slope roughness on the human activities impacted catchment. Moreover, we presented that in order to obtain an effective result of simulating overland runoff. The distributed hydrological model should take the spatial variation effect of the slope roughness factor into consideration and formulation.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 3668-3671
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.3668
• Online since: May 2012
• Authors: Sheng Tang Zhang, Miao Miao Li, Peng Chi
• Keywords: Distributed Hydrological Model, Hydrological Simulation, Slope Roughness, Spatial Variation

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