基于ASTER GDEM数据的黄土丘陵沟壑区流域信息提取研究

Study on Watershed Extraction from Loess Hilly and Gully Region Based on ASTER GDEM Data

数字高程模型(DEM)主要描述地面高程,其中包含了丰富的水文信息,是目前流域分析主要数据源之一。该文以陕西省富县作为研究区域,利用30m分辨率的ASTER GDEM数据,基于ArcGIS10.3平台Hydrology模块,经过洼地填充、水流方向计算、汇流累积量计算、汇流阈值确定、河网提取等对研究区流域提取方法进行研究,并对流域特征进行综合分析。结果表明:当汇流阈值为11000时,提取的河网与实际河网最接近,利用导数关系基本可以确定提取的河网反映了真实水系的阈值。

Digital elevation model(DEM)mainly describes ground elevation,which contains rich hydrological infor. mation,and is one of the main data sources of current watershed analysis. This paper uses Fuxian County of Shaanxi Province as the research area,using ASTER GDEM data with 30m resolution. Based on the Hydrology module of Arc. GIS10.3 platform,the method of watershed extraction in the study area was studied after the filling of the earth,the calculation of water flow direction,the calculation of the cumulant accumulation,the determination of the conver. gence threshold and the river network extraction,and the comprehensive analysis of the watershed characteristics. The results show that:When the convergence threshold is 11000,the extracted river network is closest to the actual river network,and the derivative relationship can be used to determine that the extracted river network reflects the threshold of the real water system.