基于年径流总量控制率的降雨典型年的研究及确定

Determination of Typical Rainfall Year Based on Volume Capture Ratio of Annual Rainfall

在海绵城市建设进程中,低影响开发(LID)设施和雨水调蓄设施规模的确定以及年径流总量控制率的计算,均需要依托于有效、合理的降雨数据。通过整理我国3个城市的多年实测日降雨数据,并运用变量相关性分析,发现各城市多年年均降雨量、累计降雨频率和年径流总量控制率与某一年的相关性均较高,那么该年的降雨数据可以反映该城市的典型降雨特性,因此,可以把该年作为海绵城市降雨年的典型年,把该年的降雨数据作为模型法的输入数据,用于确定LID和调蓄设施规模以及计算年径流总量控制率。

In the process of sponge city construction, scale determination of low impact development （LID） facilities and storage devices and calculation of volume capture ratio of annual rainfall are all based on effective and reasonable rainfall data. The daily rainfall data of three cities in China were put in order and analyzed by using variable correlation method. It was found that the average annual rainfall, cumulative rainfall frequency and volume capture ratio of annual rainfall of every city were all highly correlated with that of one certain year. So, rainfall data of this year could reflect the typical rainfall characteristics of the city. Therefore, the year could be regarded as typical sponge city rainfall year, and the rainfall data of the year were used as input data of model method, to determine the scale of LID facilities ＆ storage devices and calculate the volume capture ratio of annual rainfall.