流域数字化过程中出口断面的自动识别方法研究

Automatic Identification of Catchment Outlet in Its Digital Processing

针对现有流域数字化过程中出口断面判定方法的智能性不高问题,利用数字高程模型(DEM),基于水文站点坐标及水文站集水面积,提出了一种流域出口断面的自动识别方法。以新安江上游屯溪、渔梁、月潭和临溪流域为例,对该识别方法进行了应用验证,结果表明,采用该方法能够实现对4个流域出口断面的准确定位,集水面积相对误差均能控制在1%以内。自动识别方法不仅能够保证出口断面的定位精度,同时还可以避免人为干预,提高流域数字化的效率,在数字水文学领域具有广阔的应用前景。

In view of the low intellectuality of existing outlet determination methods in digital catchment processing, an automatic identification method of catchment outlet is developed through the use of Digital Elevation Model （DEM） based on the coordinates and drainage areas of hydrological stations. The automatic identification method is tested in four catchments located in the upstream region of Xinanjiang Basin, including Tunxi, Yuliang, Yuetan and Linxi catchment. The results indicate that the catchment outlets can be accurately obtained by using the proposed method and the relative errors of catchment drainage areas are less than 1%. The automatic outlet identification method can not only ensure the positioning accuracy, but also avoid the manual intervention and improve the efficiency of digital catchment processing. This proposed method has a broad application prospect in the field of digital hydrology.