The observetions of flash flood events in the Yangtze River Delta region

We have selected and observed 7 representative watersheds in the Yangtze River Delta region. The discharge stations in the outlets and several rainfall gauges for each basin were set to observe streamflow and rainfall, respectively. The total rainfall for each basin is estimated via the Thiessen polygon method. Overall, a total of 172 flash flood events during the rainy season, caused by extreme rainstorms, in these 7 headwater basins is observed.

本研究选取并观测了长江三角洲区域的7个典型流域。各流域的出口处布设流量监测站，并设置多台雨量计，分别用于监测径流与降雨。各流域的总降雨量通过泰森多边形（Thiessen polygon）法进行估算。整体而言，在这7个源头流域的雨季期间，共观测到172场由极端暴雨引发的山洪事件。