基于遥感信息的淹没水深算法研究

该文针对遥感监测的洪水范围。提出一种实用的洪水淹没水深算法。该算法视淹没区为静态水面分布。将其与DEM叠加。经系列误差处理与优化。得到相对平滑的水陆边界高程。再采用双线性插值计算淹没范围内的水深分布。以广东省北江流域清远地区2002年10月底的一次洪水为例进行验证。结果表明该算法在计算精度和效率方面均能满足实际洪水评估要求。

An Algorithm for Inundated Depth Calculation of Flood Based on Remotely Sensed Data

The paper puts forward an algorithm to calculate the depth distribution within the inundated region extracted from the satellite imagery,which can be applied in the flood monitoring and loss evaluation.The algorithm combines the flood region with DEM and acquires a smooth elevation distribution in the flood borderlines after efficient error control due to inadequate precision in the satellite imagery processing and DEM itself.After assuming floodwater in the flood area to be an inclining plane,the depth distribution within the boundaries can be computed using a bilinear interpolation algorithm.The result in the test site shows the algorithm can meet the requirement of the flood loss estimation both in precision and computing speed.