小流域侵蚀产沙分布式数学模型的研究

 为反映因下垫面因子空间分布不均和人类活动对流域侵蚀产沙的影响,建立了基于场次暴雨的小流域侵蚀产沙分布式数学模型。该模型能够模拟出流域在不同水土保持措施(不同土地利用类型)下的径流和侵蚀产沙的时空过程,从而加强了在水土保持措施制定中的应用,并能够检测流域管理措施对径流泥沙过程产生的影响,进而为配置流域内水土保持措施和检测流域管理,提供技术支撑和科学依据。经黑草河小流域实测资料率定和验证,计算值与实测值符合良好。

Study on A Distributed Model for Soil Erosion and Sediment Yield in Small Watersheds

To understand the effect of the spatial heterogeneity of underlying surfaces and man kind activities on the soil erosion and sediment yield in small watershed, a distributed model for sediment yield in small basins based on isolated storm events is developed. The model can respectively simulate space-time processes of runoff formation and sediment yield for the small watersheds with various water-and-soil conservation measures (various using type of land), and is helpful for the optimization of these measures in the management of the small watershds. The model is finally calibrated and validated by measured data in the Heicaohe basin. Results showed that the proposed model can reasonably simulate rainfall-runoff-sediment transport in small watershed.