利用MIKE21前后处理模块实现河床冲淤可视化分析

为实现河床冲淤变化的可视化分析,结合2008、2009及2011年闽江下游大目埕河段实测地形资料,介绍了利用MIKE21前后处理模块中地形网格生成、数据提取及网格面积计算等常规功能建立河段数字高程模型(DEM)及河床冲淤可视化、横断面自动提取及冲淤量计算的基本流程。大目埕河段冲淤分析结果表明,2008、2009、2011年该河段总体呈冲刷状态,仅在边滩零星部位出现淤积,全河段河床平均下切2.31m,冲刷总量为659.22×104 m3。该研究方法简单方便,冲淤分析结果直观,可有效应用到河道演变分析中。

Visualization Analysis of Riverbed Erosion and Deposition Using MIKE21 Preprocessing and Postprocessing Modules

In order to realize visualization analysis of scouring and siltation of the riverbed, the basic process of the visualization analysis on evolution of erosion and deposition, extraction of cross sections and the calculation of the volume of erosion or deposition by utilizing MIKE21 preprocessing and postprocessing was introduced based on the measured data of the Damucheng Reach of the Lower Reaches of Minjiang in 2008, 2009 and 2011. The analysis results of erosion and deposition of the Damucheng River show that the reach was in scoured state in 2008, 2009 and 2011 and the deposition was occurred in scattered parts of the point bar. The average scour depth of the riverbed was 2.31 m, and the amount of sand erosion was 6 592 200 m3. The research method is convenient and simple, and can be applied to the river evolution.