基于SRTM DEM的大凌河流域地表水文自动模拟

Automatic Simulation of the Surface Hydrology of Dalinghe Watershed Based on SRTM DEM

[目的]基于SRTM DEM,对大凌河流域地表水文进行自动模拟。[方法]以大凌河流域SRTM DEM数据为支撑,在ArcGIS Model-Builder环境下构建大凌河流域地表水文模拟模型。[结果]地表水文模拟模型实现了大凌河流域范围的自动划分和大凌河流域水系的自动提取。同时,也更加便捷地解决了水文模拟中DEM填洼阈值和河网提取阈值的选择问题。大凌河流域范围划分准确,大凌河和相应Ⅰ级支流的提取结果与实际水文情况十分接近,但旁系小支流末梢的提取效果有待改进。[结论]该研究为今后地表水文的模拟提供了科学参考。

[Objective] The aim was to simulate the surface water flow of Dalinghe watershed based on SRTM DEM.[Method] By using ArcGIS ModelBuilder,and SRTM DEM data of Dalinghe watershed as input data,the model to simulate the water flow of Dalinghe watershed was set up.[Result] The model realized automatic division of Dalinghe watershed area and extraction of stream network.In the meantime,it also made the choice of threshold during filling DEM and extracting stream network much easier.The division of the Dalinghe watershed was precise and the extraction result of Dalinghe and its corresponding Ⅰlevel tributary river was close to actual stream network.However,the extraction of the smaller stream was less accurate.[Conclusion] The study provided scientific reference for the simulation of surface water network in future.