天山西部山区流域信息的提取

Extraction of watershed information of West Tianshan Mountain

为了较合理准确地建立天山西部山区分布式水文模型,以哈什河流域为研究区,用新疆比例尺为1∶250000、分辨率为100mDEM数据作为基本的地形数据,并借助ArcGIS软件,探讨了天山西部山区流域信息提取的方法。在水系提取过程中,通过引进河网密度来确定集水面积阈值的方法能够提取较合理准确的流域水系,提取的主河道长与实际误差为1%,流域面积与实际误差为0.6%,提取的河网同实际的误差较小,完全能够满足水文模拟与生产的需要。

The extraction of the watershed information of West Tianshan Mountain is discussed herein by taking Khash River Basin as the studying area and the data of Xinjiang with the scale of 1 ： 250 000 and the resolution of 100 m DEM as the basic topographic data and by means of ArcGIS software, so as to establish a more rational and exact distributed hydrological model for the West Tianshan Mountain. During the extraction of the information concerned, more rational and exact water system of the watershed can be extracted out with the method of determining the threshold value of the catchment area through introducing the density of the river network into the calculation. Compared with the actual values, the error of the extracted length of the main river is 1% and the error of the watershed area is 0. 6% ; thus the error of the value extracted for the river network is less compared with the actual value, and then can fully meet the demands of both the hydrological simulation and the actual production therein.