郑东新区龙子湖供水井群优化研究

采用Aqua3D有限元软件对郑东新区龙子湖地下水开采进行了井群优化研究。开采工况1没有考虑雨水利用,开采地下水仅满足湖水景观用水,14口井均匀开采,地下水开采量为274×104m3/a,无降落漏斗出现,水位降深较小(1~2 m),可能会导致湖体周边土地盐渍化现象产生;开采工况2既要供给高校用水,又不利用雨水资源,20口井均匀开采,地下水开采量为1049×104m3/a,漏斗中心出现在湖体外侧北部,最大降深8.5 m,会影响到邻近水源地的正常运行;开采工况3地下水开采量为593×104m3/a,其中方案1为14口井均匀开采,方案2(14口井)和方案3(12口井)为非均匀开采,3个方案漏斗中心均出现在湖体东侧,漏斗中心最大降深依次为4.6、4.3和4.2 m。工况3既考虑了雨水利用,又考虑了龙子湖工程与高校杂用水供水系统联合运行,为一个高效供水方案,其中方案3水位下降最小为推荐方案。

Research on Optimization of Wells in Longzi Lake in Zhengdong Area

Groundwater will lately be exploited to supply for Longzi Lake in Zhengdong area.In this paper Aqua3D definite element software is used for research on wells optimization.In mode 1: rainwater is not considered,and groundwater is exploited only for lake;the total yield of 14 wells is 274×104 m3/a,and that of every well is equal;water level drawdown is little(only 1~2 m) without cone of depression,and this would lead to soil salinization.In mode 2: rainwater is not used,and groundwater is exploited not only for lake but also for colleges;the total yield of 20 wells is 1049×104 m3/a,and that of every well is equal;the biggest water level drawdown is 8.5 m with a cone of depression on the north of lake,and this would influence the adjacent work.In mode 3: the total yield is 593×104 m3/a;there are 3 plans including even exploitation of 14 wells in plan 1 and uneven exploitation of 14 wells in plan 2 and 12 wells in plan 3;the biggest water level drawdown of three plans are 4.6、4.3 and 4.2 m with a cone of depression on the east of lake in each plan.Mode 3 is a efficient water supply mode because of rainwater usage and combined water supply between Longzi Lake and colleges,and plan 3 is considered best due to its least drawdown.