Extraction of Watershed Eigenvalues Based on DEM
FENG Jiaojiao
Abstract：Five basins in Langfang city,Juhe River,Baoqiu River,Longhe River,Yongxing River and Mangniu River,were selected to extract sub-basins based on DEM using ArcGIS,and the extracted basin area,main channel length and channel gradient were analyzed with reference values.The research showed that the larger the basin area,the less affected by the accuracy of DEM data,and the extracted eigenvalues were closer to the reference values.The length of the main channel is less affected by the terrain,so the deviation rate between the extracted value and the reference value is basically acceptable.The deviation rate of channel slope is relatively large,and the main reason is that the original calculation formula is different.Under the condition that the actual value of channel slope cannot be verified,the channel slope extracted based on river network can also be applied.This study further verifies the feasibility of watershed eigenvalues calculated by DEM in practical application.
Keywords：ArcGISDEMeigenvalueLangfang City
Publication Date：2026-05-20
Online Publishing Date：2026-09-16(First online date of this platform, not the publication date of the document)
Pages：5( 81-84,104 )