为了解船闸水利设施运行造成的水质污染效应,以葛洲坝船闸为研究对象,结合实测资料采用非线性分形技术对污染物分布特征进行了分析。现场观测结果发现：支流与主江汇聚口两侧航道水域为污染物高浓度分维数分布区,分维数形几何形态清楚,影像分维数值为2.7263,高于其它水域污染富集区节点边缘的分维数。同时段影像灰度差异可决定是否具有统计意义上的自相似性,经计算将奇异部分的分维值( DB <2)提出组成集合,即为污染物质富集高值区,平面分布的位置与边缘特征。%In order to interpret the impact of ship-lock operation on water pollution, taking Gezhouba Project as a study ob-ject, combining field observation data and applying nonlinear fractal technology, the paper presents an analysis on the pollution distribution characteristics in the water zone of ship lock. Field observation shows that the navigation channels of both sides at confluence of main flow and tributary are the distribution zones of high pollution concentration of fractal dimension, the geometric figure of fractal dimension shape is clear, and the image fractal dimension is 2. 7263, which is higher than that at the edge of the nodes of centralized pollution zones. Image gray level difference in the same period can determine whether there is a statistical self-similarity. By calculation, the singular fractal dimensions (DB<2) are extracted to form a set and they are high pollution concentration zone and edge feature of high pollution concentration zone.
展开▼
