城市下垫面渗蓄性能量化模拟试验研究

Experimental study on quantitative simulation of infiltration and storage performance of urban underlying surface

在城市化快速进程中,下垫面渗水、蓄水性能的逆向变化,成为了影响城市内涝的控制因素之一。实验室条件下采用不同比例的砂土来混合制作模型,模拟城市下垫层土层,根据桂林市降雨资料,以桂林市新城区临桂新区为目标实验地,采用不同重现期雨型进行模拟降雨实验,通过对不同条件下的下垫面蓄渗性能的实验研究分析,来评估其海绵城市建设的效果。实验结果表明:在相同的降雨强度及坡度下,模型蓄渗性能与含砂量呈正相关;在相同的模型含砂量及坡度下,模型蓄渗性能与降雨强度呈负相关;在相同的模型含砂量及降雨强度下,模型蓄渗性能与坡度呈负相关。本实验研究结果对于城市下垫面规划及海绵城市建设具有一定的参考意义。

In the rapid process of urbanization,the reverse change of water seepage and water storage performance of underlying surface has become one of the controlling factors affecting urban waterlogging.Under laboratory conditions,different proportions of sandy soil are mixed to make a model to simulate the urban underlying soil layer.According to the rainfall data of Guilin,taking Lingui New District,a new city of Guilin as the target test site,rainfall simulation experiments are carried out with different return periods of rain patterns,and the experimental research and analysis of the infiltration storage performance of the underlying surface under different conditions are carried out,so as to evaluate the effect of sponge city construction.The experimental results show that:Under the same rainfall intensity and slope,the seepage storage performance of the model is positively correlated with the sand content;Under the same model sand content and slope,the model seepage storage performance is negatively correlated with rainfall intensity.Under the same model sand content and rainfall intensity,the model seepage storage performance is negatively correlated with the slope.The results of this experiment have certain reference significance for urban underlying surface planning and sponge city construction.