川东平行岭谷区典型水库形态研究

Study on the Morphology of Typical Reservoirs in Paralleled Ridge-Valley of Eastern Sichuan

以川东平行岭谷区达州市大竹县的同心桥水库、乌木滩水库、龙潭水库为研究对象,基于高精度遥感影像等资料获取水库边缘线,运用标准差椭圆、盒子维数、形状指数度量水库方向特征与形状复杂度。结果表明:盒子维数能有效描述水库的边缘复杂性特征,与形状指数有较好的对应关系;3个水库中乌木滩水库盒子维数最大为1.15,形状指数8.22,同心桥水库盒子维数最小为1.0538,形状指数3.709,龙潭水库介于二者之间。标准差椭圆揭示的水库主轴倾角各有差异,但总体上呈现北东方向,与区域地貌走向总体吻合。盒子维数揭示的水库边缘形态特征受局部地形条件影响,水库主轴方向则受区域地貌宏观格局制约。

Based on high-precision remotely sensed images and other data,the reservoir edge lines were measured using the standard deviation ellipse,box dimension,and shape index for the reservoirs of Tongxinqiao Reservoir,Wumutan Reservoir,and Longtan Reservoir in Dazhu,Dazhou County,Eastern Sichuan Province. The results are as followed. The box dimension can effectively describe the edge complexity of the reservoir and has a good correspondence with the shape index. Among the three reservoirs,the Wumutan reservoir has a maximum box dimension of 1.1529,a shape index of 8.22,the Tongxinqiao reservoir has a minimum box size of 1.0538,a shape index of 3.709,and the Longtan reservoir′ s results between the two. The standard deviation ellipse reveals different inclinations of the reservoir＇s main shaft,but it generally presents the NEE direction,which is in general agreement with the regional landform trend. The reservoir edge morphology revealed by the box dimension is affected by the local topographic conditions and the direction of the reservoir main shaft is constrained by the regional landscape macro-pattern.