用于复杂流域特征提取的两轮填平法及其在珠江流域的应用研究

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中图分类号：TV1 文献标识码：A 文章编号：1001-9235（2025）08-0076-06

Two-round Fill-up Method for Feature Extraction in Complex Watersheds and Its ApplicationtothePearl RiverBasin

WANGJiahu'，PUWenjie'，DUJiayang，ZHANGWenming，LI Li-1

HohaiUniversity，njing0o8，China;2.hongqingJaotongUniversity，hongqing4o74，Cina;3.BureauofHdrolog Pearl River Water Resources Commission，Ministry of Water Resources，Guangzhou 51O611，China）

Abstract：Digitalwatersedfeatureextractioianessentialfoundationfordistrbutedhydroloicalprocssulationandalsoabsis forconstructinga"digitaltwin"waterconservancyproject.Tominimizethedisturbanceofriverdatatotheoriginaldigitalelevation model （DEM）andimprovethecalculationspeed，thispaperadoptsthetworoundfll-upmethodforthePearlRiverBasinTheriver rastersandthewhole-basinrastersarefiledseparately.Theflowdirectionofthemainrivernetworkisdeterminedfirst，ndtee rastersofthemainrivernetworkandtheregionalboundariesareusedastheexitsforthefll-upofthewholebasintogetheflow directionsofalltheastersanddeterminethedigitalwatershed.Comparedwithtemanualldigitizedwatersheds，teresultsftis paper show the total area error of - ⋅11.0% ，of which the area error of the Dongjiang River is -3. 6% ，and that of theXijiangRiver is 1 2.5% ，havinganobviousadvantage，compared with similar products（HydroSHEDSand Zhonghong Systembackstage data）.The methodof thispapercanimprovetheprecisionandaccuracyofwatershedfeatureextractiontoacertainextentandhassignificant application value.

Keywords：two-round fill-up;watershed feature extraction;Pearl River Basin 数字流域特征提取是指利用流域DEM（Digital

ElevationModel）数据构建数字水系模型并提取流域面积、河网密度、流域形状、流域高度、水流方向等流域水文特征的方法[1-2]，是分布式水文过程模拟的重要基础[3-4]，同时也为构建“数字孪生"工程提供基础数据。（剩余6220字）