ANSWER2000在小流域土壤侵蚀过程模拟中的应用研究

ANSWERS2 0 0 0是一个用于流域土壤侵蚀过程模拟的分散型物理模型 ,将此模型运用于三峡库区小流域侵蚀产沙、地表径流以及不同土地利用类型水沙分布状况的模拟中。通过两个不同小流域模拟结果的对比 ,采用误差百分比、线性回归以及 Nash- Sutcliffe效率 3种方法 ,分析和评价了模型的模拟效果。结果表明 ,模型在应用于我国三峡库区小流域土壤侵蚀模拟时 ,其模拟结果与实测结果具有较高的吻合度 ,模拟结果基本可信。但是 ,对于一些陡坡林地等特殊地类 ,模型的模拟误差较大 ,其模拟精度还有待于进一步提高。

Applying ANSWERS2000 to Simulate Soil Erosion Process on Two Watersheds of Th ree Gorges Area

ANSWERS2000, a watershed scale, physically-based, and distributed model was applied to simulate sediment and runoff from two small watersheds located in the Three Gorges area. Based on the comparison of simulated results between two different watersheds, the model was evaluated by three various ways including percent error, linearity regression, and Nash-Sutcliffe model efficiency. The study showed that the model performed well when using it for the simulation and the simulated results caught the observed highly. However, the model performed with high percentage error when it was used on forest lands simulation and the model efficiency needed to be improved later.