扬州市主城区水系连通性定量评价及改善措施

为研究扬州市主城区水系连通状况,基于图论边连通度方法,利用GIS技术提取水系,建立了扬州市主城区水系图模型并计算了水系边连通度。结果表明:扬州市主城区水系连通度为2;影响水系整体连通性的关键河段为七里河与沙施河交汇口至古运河段、仪扬河与赵家支沟交汇口至西银沟段、揽月河闸至赵家支沟段以及老沙河与沙施河交汇口至曲江公园段;关键水闸为扬州闸、黄金坝闸、平山堂泵站、明月湖闸,这4个闸站关闭后分别使整体的连通度降低了50%;可采用河道清淤、生态护坡、水闸调控等措施来改善扬州市主城区水系连通性。

Quantitative evaluation and improvement measures of water connectivity in main urban area of Yangzhou

In order to study the water connectivity in the main urban area of Yangzhou, this paper extracts the water system based on the method of graph theory edge connectivity and uses GIS technology to establish the water system graph model of the main urban area of Yangzhou and calculate the water system edge connectivity. The results show that the water connectivity of the main urban area of Yangzhou is 2. The key sections affecting the overall connectivity of water system include the section from the junction of Qili River and Shashi River to the ancient canal, the section from the junction of Yiyang River and Zhaojiazhigou to the Xiyingou, the section from the Lanyue River to Zhaojiazhigou, and the section from the junction of Laosha River and Shashi River to Qujiang Park. The key gates and dams are Yangzhou Gate, Golden Dam Gate, Pingshantang Pumping Station and Mingyue Lake Gate. After the four gates are closed, the overall connectivity is reduced by 50%. Measures such as river dredging, ecological slope protection, and sluice control can be used to improve the water connectivity in the main urban area of Yangzhou.