Surface digital elevation model for urban local flooding simulation
Correct expression of urban surface features,especially accurate handling of surface micro-topography,is a critical factor affecting accuracy of urban flood modeling.To achieve high-precision simulation of urban flooding,traditional terrain survey data were used to study standard processing methods in urban surface DEM models.This includes correction methods for pseudo-depressions on the surface,methods for handling urban road terrain,and methods for correcting building heights.The ArcGIS hydrological analysis module was used to identify and to correct depressed areas.Correction of building heights enabled simulation of surrounding water flow processes affected by buildings.Fitting and densifying road terrain effectively addressed the issue of insufficient elevation data,resulting in clear outlines and smooth road surfaces.Terrain processing was found to have significant impact on model calculation results.For different rainfall scenarios in the study area,numerical deviation in water depth before and after terrain processing ranged from 10.5％-63.3％,with depth differences of approximately 0.14-0.38 m.
urban local flooding modelsurface digital elevation modelmicro-topography processing
万方数据
维普
