Abstract：
With the development of the city, people pay more attention to the ecological construction of the city. The objective of this work was to study the effect of artificial lakes on hydrodynamic conditions in urban drainage systems. With Arcgis and the advantage of SWMM in analyzing the impact of the rainfall process on urban runoff, the urban flooding model of \"pipe network + river network + artificial lake\" was established in the study area. Two scenarios were set up with and without the presence of artificial lakes, and comparative analyses were conducted under the different intensities of rainfall (0.5a, 1a, 2a, 5a, 10a, 20a). The results show that under certain rainfall conditions, the presence of the artificial lake increases the peak flow and rate of upstream streams and decreases the flow and rate of downstream streams in the regional drainage system. The duration of the peak flow rate in the upstream channel increases, and the flow rate curve becomes flat during the confluence; the flow rate in the downstream section decreases, and the magnitude of the peak flow rate change decreases, and a more obvious horizontal section appears. The time of peak occurrence in the downstream river is earlier. The hydrodynamic impact on the downstream channel is more significant. The improvement of hydrodynamic conditions of the drainage system by the artificial lake helps to optimize the layout of low impact development (LID) measures in the study area and also guides ecological construction in other cities.
摘要：
随着城市的发展,人们更加关注城市的生态建设。这项工作的目的是研究人工湖对城市排水系统中水动力条件的影响。利用Arcgis和SWMM的优势分析降雨过程对城市径流的影响,在研究区建立了“管网+河网+人工湖”的城市洪水模型。在有和没有人工湖的情况下设置了两种场景，并在不同降雨强度下进行了比较分析(0.5a，1a,2a,5a,10a,20a).结果表明,在一定的降雨条件下,人工湖的存在增加了上游河流的峰值流量和流量，并降低了区域排水系统中下游河流的流量和流量。上游通道的峰值流量持续时间增加，在汇合过程中，流量曲线变得平坦；下游段的流量减小，峰值流速变化的幅度减小，更明显的水平部分出现。下游河流出现峰值的时间较早。对下游通道的水动力影响更为显著。人工湖改善排水系统的水动力条件有助于优化研究区低影响开发（LID）措施的布局，并指导其他城市的生态建设。
