基于地貌扩散和水动力扩散的流域瞬时单位线研究

Study on WGIUH by means of geomorphologic and hydrodynamic dispersion

流域汇流是地貌扩散和水动力扩散共同作用的结果。用宽度函数描述地貌扩散 ,用河道响应函数描述水动力扩散 ,从而导出了流域地貌瞬时单位线的表达式。建立了长江三峡区间沿渡河流域的数字高程模型 (DEM) ,由此自动生成了该流域水系 ,并提取了流域地貌瞬时单位线公式所需的地貌信息。 2 3场洪水的检验结果表明 :所建议的流域地貌瞬时单位线公式用于流域汇流计算具有较高的精度。

The geomorphologic dispersion is described by the width function, the hydrodynamic dispersion is described by the channel response function, and a formula of the watershed geomorphology instantaneous unit hydrograph (WGIUH) can be obtained. The geomorphologic parameters in the formula of WGIUH is determined by the digital elevation model (DEM) of watershed. The example is given in order to test and verify the new method.