基于DEM的地貌单位线在铁路桥涵水文分析中的应用

Application of geomorphologic unit hydrograph based on DEM in hydrological analysis of railway bridge

以新疆博州支线铁路的某一流域为例,利用数字高程模型(DEM),获取了流域雨滴流路长度分布律及坡度分布律,在此基础上获得流域地貌瞬时单位线,并利用典型雨型求得流域洪水过程,同时得到了洪峰流量,指出用此方法求得的洪峰流量与该地区铁路桥涵水文分析模量公式结果相近,采用地貌单位线进行流域汇流计算能够取得较高的计算精度。

Based on a certain watershed of Xinjiang Bozhou branch railway, the Digital Elevation M odel（DEM ） is used to obtain the distribution law of the raindrop flow path and the slope distribution law. On this basis, the instantaneous unit hydrograph of the basin is obtained, and then the typical rain to obtain the river basin flood process, but also get peak flow. The peak flow rate obtained by this method is similar to that of the hydrological analysis model of railway bridge in this area, and the calculation accuracy of the river basin convergence can be achieved by using the geomorphologic unit hydrograph.