东光县地下水压采效果及环境影响预测

Forecast of underground water compressive exploitation effects and environmental impact in Dongguang County

运用Visual-MODFLOW软件建立东光县地下水流数值模型,对不同压采方案下地下水水位回升效果进行预测,并分析其环境影响。结果表明:仅压采深层地下水(方案1)时,承压含水层水位整体明显抬升,升幅为2.0~11.7 m,其中处于超采区的东光县城区升高幅度最大;同时压采浅层和深层地下水(方案2)时,承压含水层水位增幅在1.4~11.6 m,城区水位增幅依然最大。两种压采方案对潜水含水层的影响有限,潜水位前期出现不同程度的波动,后期水位较为平稳。总体上,两种方案下整个区域主要潜水位埋深为3~4 m;方案2下,个别地段水位埋深为1.8 m,低于本区防盐碱化临界水位埋深2.0 m,可能造成次生盐碱化风险。

Numerical model of groundwater in Dongguang county is established by using Visual-MODFLOW software to forecast the effects of water level recovery and environmental impact under different compressive exploitation schemes. The results indicate that the water level of confined aquifer rises obviously about 2. 0 ？11.7 m when only the deep groundwater is compressed （ scheme 1） , and the largest increase of water level is in Dongguang County which is located in the over-exploited area. Under the condition of compressive exploiting of shallow and deep groundwater at the same time （ scheme 2 ） , the confined water level rises about 1.4 ~ 11. 6 m, and urban water level still has the largest increase. The two schemes have limited influence on unconfined aquifer, and the water level fluctuates in the early stage and remains relatively stable later. As a whole, the phreatic water depth of whole area is mainly 3 ？4 m under the two schemes,but the individual water depth in certain area is 1. 8m in scheme 2, lower than the critical water depth of 2. 0 m for prevention and cure of soil salinization, thus possibly causing secondary salinization risk.