Simulation of '6.10' Storm Flood Using a 2-D Hybrid Approach in Shalan Watershed in Heilongjiang Province

摘要

Using supposed rainfall process of "6.10" storm in Shalan catchment and extracted drainage network from raster DEM with 90-m resolution, a hybrid approach which combining simplified hydrology process with 2-D hydraulic model was developed and used to simulate the storm flash flood in Shalan River basin in Heilongjiang Province. The result shows, the maximum flood discharge in outlet is 415 m~3/s, the maximum water depth nearby the Shalan town is 1.3 m, flash flood lasting period is 5 -6 h, and 1 -2 h for water depth over 1 m at the same location. The flood zone mainly locates along the Shalan River with the width of 500 m. Though default of flood observation and remote sensing data, the simulation shows reasonable agreement with real situation. The results imply that the proposed approach are apt to simulate storm flash flood with reliable resolution in mountainous area or valleys, it can served as a new tool for analysis of national storm flash flood in mountainous area or valleys.