黄土丘陵沟壑区中大流域侵蚀产沙模型与尺度转换研究

Sediment Yield Model and Upscaling for Medium and Large Watersheds in Hilly and Gully Region of the Loess Plateau

由于侵蚀产沙因子时间和空间上的变异性,中大流域的侵蚀产沙过程模拟相对于小流域更为复杂化,目前已存在的物理模型和经验模型均难以很好地运用在中大流域。分析了中大流域的侵蚀产沙特点及已有的模型,认为尺度转换技术是实现大中流域侵蚀产沙模拟研究重要的途径,并对尺度转换的方法进行了探讨。

Due to the spatial and temporal variations of environmental factors, the processes of soil erosion and sediment yield in medium and large watersheds are much more complex than those in small watersheds. As a result, both empirical and physics-based models can hardly be applied in medium and large watershed with a reasonable result. This paper first illustrates the characteristics of soil erosion and sediment yield in the medium and large watersheds, and then gives a review of the models developed for the watersheds. Some methodologies to upscaling, which may be an important approach to simulating the processes of soil erosion and sediment yield in the medium and large watershed, are also discussed.