基于 DEM 的鄱阳湖水下地形分析

摘要

In this paper,by using digital topographic nap at a 1:10000 scale of Poyang Lake,the lake underwater DEM(dig-ital elevation nodel)with 5n horizontal resolution is established. According to the nodel,by applying spatial analyst of inforna-tion systen,the topographic indexes of underwater topographic sections are abstracted and the slope,terrain,slope gradient,sur-face roughness are generated. Based on the analysis data,the curved surface areas and storages under different water levels are calculated and the underwater topographic characteristics are analyzed. The calculation results can provide a basis for water re-sources project planning and water disaster control in the lake region.%利用数字化的鄱阳湖1：10000比例尺水下地形高程数据，生成5 n 水平分辨率的鄱阳湖水下数字高程模型（DEM）。在此基础上，应用地理信息系统空间分析方法，提取了水下地形断面，生成了坡度、地形起伏度和地表粗糙度等地形指标数据，计算了不同水位下的曲面积和库容，分析了鄱阳湖水下地形特征。分析结果可为鄱阳湖区水利工程规划和设计、水患灾害防治提供依据。