The climate change and urbanization have interacted synergistically to impact the water environment problem of urban lakes in the late twentieth century. In this paper, an integrated model describing hydrology, hydrodynamics and water quality was developed based on SWMM and the DEM-based hydrodynamic and water quality model. The Tangxun Lake was used as a testbed here, and the impacts of rainfall intensity and urbanization on lake water quality was discussed through the scenario analysis. The results showed that the runoff volume and the pollution load of TN and TP into the Tangxun Lake increased significantly with the increase of the rainstorm intensity. In the prophase rainfall, the TP and TN concentration gradually increased. The greater the rainstorm intensity was, the worse the lake water quality would become. While in the late rainfall, the lake's water quality improved slightly. After the rainstorm, the water fluidity in the lake was obviously improved. Spatially, the water flow presented a directional flow from the runoff inlets to the lake outlet, and the contaminants gradually diffused from the boundary area to the center of the lake. On the other hand, with the rapid development of urbanization, the runoff depth, runoff coefficient and pollutant loads had obviously increased, thus the average TN and TP concentration in the lake also increased. Compared with the early urbanization stage, the total pollution loads of TN and TP increased by 53.49t and 8.88t respectively after the 24-hour rainstorm in the late urbanization stage.

在二十世纪后期，气候变化和城市化协同作用，共同影响了城市湖泊的水环境问题。本文基于SWMM和基于DEM的水动力和水质模型，建立了一个描述水文，水动力和水质的综合模型。这里以塘x湖为试验场，通过情景分析讨论了降雨强度和城市化对湖水水质的影响。结果表明，随着暴雨强度的增加，进入塘逊湖的总氮，总磷的径流量和污染负荷明显增加。在前期降雨中，总磷和总氮浓度逐渐升高。暴雨强度越大，湖泊的水质就越差。在下雨的时候 湖泊的水质略有改善。暴雨过后，湖中水的流动性明显改善。在空间上，水流呈现出从径流进口到湖泊出口的定向流动，污染物从边界区域逐渐扩散到湖泊中心。另一方面，随着城市化的快速发展，径流深度，径流系数和污染物负荷明显增加，湖泊中的总氮和总磷浓度也增加。与城市化初期相比，城市化后期24小时暴雨过后，总氮和总磷负荷分别增加了53.49t和8.88t。水流呈现出从径流进口到湖泊出口的定向流动，污染物从边界区域逐渐扩散到湖泊中心。另一方面，随着城市化的快速发展，径流深度，径流系数和污染物负荷明显增加，湖泊中的总氮和总磷浓度也增加。与城市化初期相比，城市化后期24小时暴雨过后，总氮和总磷负荷分别增加了53.49t和8.88t。水流呈现出从径流进口到湖泊出口的定向流动，污染物从边界区域逐渐扩散到湖泊中心。另一方面，随着城市化的快速发展，径流深度，径流系数和污染物负荷明显增加，湖泊中的总氮和总磷浓度也增加。与城市化初期相比，城市化后期24小时暴雨过后，总氮和总磷负荷分别增加了53.49t和8.88t。径流系数和污染物负荷明显增加，湖中总氮和总磷浓度也增加。与城市化初期相比，城市化后期24小时暴雨过后，总氮和总磷负荷分别增加了53.49t和8.88t。径流系数和污染物负荷明显增加，湖中总氮和总磷浓度也增加。与城市化初期相比，城市化后期24小时暴雨过后，总氮和总磷负荷分别增加了53.49t和8.88t。