厦门海绵化改造区入渗性能测定及特征

为探究厦门海绵城市改造完成区的入渗性能,利用Guelph入渗仪法测量了两条海绵道路及一个海绵小区的土壤饱和导水率,对比分析了5 cm单水头、10 cm单水头、单水头均值及双水头法所测得土壤饱和导水率的差异,并与传统城市建设区进行了对比分析。结果表明:设有生态多孔纤维棉的新顺路绿化带入渗性能最好,采用一般转输型植草沟的新景路绿化带次之,而设有隔水顶板、地下为停车场的洋塘居住区B13绿地入渗性最差。不同测量方法的结果对比显示,5 cm单水头法计算所得的土壤饱和导水率标准差最小,双水头法的土壤饱和导水率标准差最大;在厦门进行土壤入渗试验时,推荐采用5 cm单水头法计算土壤饱和导水率。

Measurement and characteristic analysis of infiltration performance in Xiamen spongification reconstruction area

In order to explore the infiltration performance of Xiamen sponge city reconstruction completed area, the soil saturated hydraulic conductivity of two sponge roads and a sponge plot was measured by Guelph infiltrometer. The differences of soil saturated hydraulic conductivity measured by 5 cm single-head, 10 cm single head, single-head mean and double-head method were compared and analyzed. The soil saturated hydraulic conductivity in spongy and non-spongy areas was also compared. The results show that the infiltration performance of Xinshun Road greenbelt with ecological porous fibre cotton is the best, followed by Xinjing Road greenbelt with general transfer grass-planting trench, while the infiltration performance of B13 green space in Yangtang residential area with waterproof roof and underground parking lot is the worst. The results of different water head measurements show that the standard deviation of soil saturated hydraulic conductivity calculated by 5cm single-head method is the smallest, and that of double-head method is the largest. It is recommended that 5cm single-head method be used to calculate soil saturated hydraulic conductivity in Xiamen for soil infiltration test.