基于SRTM DEM的陕南汉江上游流域水文特征模拟研究

Hydrology Characteristics Simulating of Hanjiang River Upstream Basin in South of Shaanxi Based on SRTM DEM

选取陕南汉江上游流域为研究样区,采用SRTM DEM作为基础数据,探讨ArcGIS9.2的水文分析扩展模块提取水文特征信息的方法,并利用该模块进行研究区水文特征提取,得到研究样区的水流方向数据、汇流累积量、河网水系、子流域边界等信息。同时,对所提取的河流网络进行有效性检验。通过与我国国家基础地理信息系统提供的5级以上河流水系数字线划图对照比较以及河网套合差的计算,发现基于SRTM DEM,采用ArcGIS软件能够提取出陕南汉江上游流域5级以上河流,提取的流域水文特征信息是有效合理的。该研究为该地区的洪涝灾害治理和生态规划建设提供依据。

Investigating in Hanjiang river upstream basin in south of Shaanxi,treating SRTM DEM as basic data,the method of extracting hydrology characteristics information was analyzed using hydrology extension module of the software ArcGIS9.2.The flow direction,flow accumulation,stream network and subwatershed boundary etc.were attained.The extracting stream network validation was tested.Through comparing with the state DLG river data which upon the five levels and calculating the overlap difference of stream networks between two data,it was considered that the river which upon the five level of Hanjiang river upstream basin in south of Shaanxi could be extracted based on SRTM DEM by ArcGIS software,and the hydrology characteristics information was effective.The research could provide a basis for harnessing flood and waterlogging and ecology planning and construction.