流域侵蚀产沙模拟研究中的尺度转换方法

Methods of scale transfer in modeling of soil erosion and sediment yield in catchments

影响侵蚀产沙过程的因素在时空上具有很大的不均匀性和变异性 ,增加了不同尺度间侵蚀产沙模拟的复杂性。尺度转换定义为不同尺度间信息传送 ,是指利用某一尺度上所获得的信息和知识来推测其他尺度上的现象。尺度转换是进行不同尺度间侵蚀产沙模拟的关键所在。认识侵蚀产沙过程中的尺度转换方法是进行不同尺度间侵蚀产沙模拟和尺度转换的基础。本文在介绍了侵蚀产沙的尺度特征后 ,对侵蚀产沙尺度转换的类型和理论方法进行了总结 。

Factors affecting the processes of soil erosion and sediment yield have more asymmetry and variability and enhance the complexity of modeling sediment yield in different scales.Scale transfer defines as conveying information in different scales,that is using one scale information and knowledge to speculate other scales phenomena.Scale transfer is the key of soil erosion and sediment yield modeling in different scales.Understanding the methods of scale transfer in the processes of sediment yield is the base of soil erosion and sediment yield modeling in different scales and scale transfer.This paper introduces soil erosion and sediment yield scale features,scale transfer styles and theory methods,and the necessity to pay attention to the problems of scale transfer.