Abstract:

Quickly and efficiently obtaining river network information is of great significance for basin hydrological analysis. In this paper, the fundamental information of flow direction, flow accumulation raster, and river network is extracted using ArcGIS based on DEM(digital elevation model) data with spatial resolution of 30 meters. Liugu river watershed in Liaoning province is taken as a case study. Furthermore, the extraction results are compared with the real river stream with spatial resolution of 1∶4 000 000, and the main river stream network matches well. The area difference between the extraction and the actual basin is only 1.99%, indicating that the spatial information technology is available to the watershed characteristics extraction. The extraction data could provide data support for hydrologic simulation and digital basin construction.

Key words: spatial information technology, DEM, extraction of river streams, hydrological characteristics, river network density