基于DEM的分布式融雪汇流模型关键算法和实现

Key algorithm and its realization about distributed Snowmelt concentrating-flow model based on DEM

根据小流域和高分辨率DEM数据的特点,在获得栅格单元的坡度、坡向、水流流向、平均流速等相关特征信息并且建立流域的汇流网络之后,建立了一种具有时空特征的基于DEM的分布式融雪汇流模型。在模型中提出了"单元时段"的概念,将其设置为大小可调的参数为模型在现实中的应用提供了极大的便利,给出了模型中的融雪汇流流向出口断面的时间长度和汇流量的关键算法及其详细实现过程的Java原程序代码,并且还针对典型研究区的春季融雪洪水期的洪水过程进行了汇流模拟演算和验证,与同期实测流量的对比分析表明,该分布式融雪汇流模型具有较好的模拟效果。

The difficulty of Distributed Snowmelt Runoff Model(DSRM) is to simulate the concentrating process of snowmelt,which plays an important role in discharging of watershed outlet,especially upon its peak value.On researching DSRM,a time-spatial featured and DEM-based Distributed Snowmelt Concentrating-flow Model(DSCFM) according to the characteristics of high-resolution DEM data of small watershed is constructed after obtaining the corresponding traits information including slope degree,slope direction,water f...