数字高程模型在流域信息提取中的应用

该文以山西省沁河流域为研究对象,对30mAster-dem数据进行拼接等预处理,利用ArcGIS软件的Hydrology扩展模块,基于数字高程模型实现水流方向的确定,流域汇流能力的分析,河网的提取,流域边界的确定和子流域的划分。利用1:25万地形图与遥感影像对通过数字高程模型提取出的流域信息进行修正,最后将生成的结果与水文资料相比较,吻合度高;通过此方法能快速获得流域信息,对流域有直观的了解,对于流域的监测与治理、保护有所帮助。

Application of digital elevation model in the watershed information extraction

Taking Qin basin of shanxi as an example,Carrying mosaic and other preprocessing for the Aster-GDEM data with 30-meter resolution,Using Hydrology extension module of ArcGIS software,Based on digital elevation model to determine the water flow direction,watershed confluence capacity analysis,extraction of river networks,basin boundaries determine and sub-basin division.Apply 1:250000 topographic maps and remote sensing images to modify the basin information extracted from the digital elevation model.The final result was generated compared with the hydrological data,high agreement.By this method can quickly access watershed information,have intuitive understanding for the basin.It is help for monitoring and management,protection for basin.