太行山前平原动水条件下地下调蓄功能实验研究——以滹沱河冲洪积平原为例

实验研究表明 ,在河道过水动水条件下 ,太行山前冲洪积平原地下调蓄功能不仅与总过水量、过水时间有关 ,而且还与河道过水流量的大小有关 ;平均每增加 1个流量 ,引起距河道 95m处地下水位上升 0 .0 31～ 0 .0 36m。距河道不同距离的地下水 ,获取河道渗漏补给的初始时间和强度存在一个随着距离增长而逐步衰减的过程 ;但是地下水位对河道渗漏补给的响应规律是一致的 ,初期为补给强度快速增大过程 ,达到极限后 ,转变为缓慢衰减过程。最有利地下水获取河道渗漏补给的地下水位埋深为 2 .0～ 2 .5m ,入渗速率大小与河道地层岩性有关。一般规律是 ,颗粒愈粗 ,入渗率愈大 ;当地下水埋深小于 2 .0m时 ,受支持毛细水顶托作用影响 ,亚沙土比粉沙的入渗率大。总之 ,山前冲洪积平原具有较强的地下调蓄能力 ,但不恒量 ,是随着各种因素改变而不断变化。

A study on artificial underground reserve function in the aquifer with river channels in Taihang piedmont plain of China:a case study in the alluvial plain of Hutuo River

The result of experiments implies that the reserve function of the aquifers with river channels from artificial recharge in Taihang piedmont plain of China is related, not only to the accumulative total volume of water and the time of river runoff but also to the unit volume of water which flows throngh rever channels. The rate of flow increased 1unit that so groundwater level rise 0.031～0.036m. The initial time and the intensity of recharging which the groundwater level in different distance to the channels is different, but the respond of groundwater level to river recharge is in the same, which rate of recharge to groundwater from river is greater in initial stage and the rate of recharge is on the decline. The groundwater level that is most advantageous to recharge is from 2.0 m to 2.5 m. The infiltration rate from river is greater in thick and is smaller in fine, which if groundwater level is less than 2.0 m the rate in clay stand is greater than that in fine stand. Therefore the reserve function of the aquifers with river channels from artificial recharge in Taihang piedmont plain is greater but it is changing with various factors.