径流汇流模拟的河道高程修正方法研究

Study on Method of River Course Elevation Correction to Improve Accuracy of Runoff Confluence Simulation

以涪江流域中游为研究区域,利用细化算法和线划跟踪算法提取河道水面的中心线,按照一定间隔采样,得到河道采样点高程。通过河道采样点初始高程,推算出河道水流方向后,对采样点进行高程修正,以确保采样点高程从上游到下游逐渐降低。最后,将采样点高程进行空间插值,并替换原有河道地形高程。结果表明,河道高程修正后,径流汇流精度得到提升。

In this paper,the middle reaches of the Fujiang River was chosen as the study area,the tessellate algorithm and line tracing algorithm were applied to extract the central line of the river water surface,and then the elevation sampling points were obtained at a certain interval.The flow directions were calculated through the initial elevation values of the sampling points,then the elevation of the sampling points were corrected according to the flow direction results to ensure that the elevation of the sampling points declined from upstream to downstream.The initial digital elevation of river course was replaced by the interpolated result of the sampling points.The results show that the accuracy of runoff and confluence was improved after correcting elevation of the river course.