下凹式绿地对周边地下水动态影响的试验研究

Experimental study on the impact of sunken green space on the dynamics of surrounding groundwater

为探究下凹式绿地对周边地下水动态的影响,本文选取了细砂、中细砂和粗砂三种不同粒径的砂土,开展不同下凹深度与不同土壤含水量条件下的室内下凹式绿地槽试验研究。试验结果表明,含水介质为粗砂且下凹深度为10 cm时,地下水动态变化最显著,水位埋深变幅达22.7%,影响范围约58 cm,其影响效果随介质渗性和下凹深度的降低而减弱。同时地下水动态变化程度与土壤含水量有关,17%含水量条件下的水位埋深变幅约是45%含水量条件的1.5倍。

In order to investigate the influence of recessed green space on the surrounding groundwater dynamics,three kinds of sandy soils with different grain sizes,namely fine sand,medium-fine sand and coarse sand,were selected to carry out indoor experimental research on recessed green space tanks with different recessed depths and different soil water contents.The test results show that when the water-containing medium is coarse sand and the depth of depression is 10cm,the dynamic change of groundwater is the most significant,and the variation of water level depth reaches 22.7%,and the influence range is about 58cm,and the effect of its influence decreases with the permeability of the medium and the decrease of the depth of depression.At the same time,the degree of groundwater dynamics is related to soil moisture content,with the water table depth variation under 17%moisture content conditions being about 1.5 times greater than that under 45%moisture content conditions.