不同DEM数据源的艾比湖流域仿真水系对比

Comparison of Ebinur lake basin water system simulation from different DEM data sources

针对干旱半干旱地区内陆河流域在仿真水系模拟方面研究较少和数据适用性的问题,该文提出利用SRTM3-DEM和ASTER-GDEM两种数据源对艾比湖流域进行仿真水系模拟和精度对比的研究。采用ArcGIS Hydrology模型分别对两种DEM进行水系模拟,通过多次设置参数和阈值,实现了不同水平分辨率和不同阈值河网水系的对比分析;然后利用Google Map河流数据和实测水系数据进行精度验证,同时采用"套河差"算法研究水系的差异。结果表明:SRTM3-DEM模拟的河网水系与实际水系更接近,吻合精度较高;DEM的坡度和水平分辨率对模拟水系的影响不大,但DEM的垂直精度对模拟水系的吻合精度起控制作用。本研究为艾比湖流域在水文方面的研究提供了一定的参照和依据。

This article is aimed at the problem of less research on river simulation and data applicability in Inland River of arid and semi-arid region,and proposes the comparative study of river simulation and simulation accuracy using SRTM3-DEM and ASTER-GDEM in Ebinur lake Watershed.Using the ArcGIS Hydrology model to simulate the river network by repeatedly setting the parameters and threshold,the results achieved the comparative analysis of different threshold and horizontal resolution of river network.The accuracy of the simulated river is verified by using the Map Google river data and the measured river data,and then analysis the difference of river network by the algorithm of＂river difference＂.The results show：the simulated river of SRTM3-DEM has high accuracy which is much closer to the actual river.The slope and horizontal resolution of DEM have little effect on simulated river,while the vertical accuracy of DEM control the simulate precision of river network.This study provides the reference and basis for hydrologic research in the Ebinur Lake Watershed,and has a significant meaning to establish digital river network in arid and semi-arid region.