开采条件下阜阳市深层孔隙水资源分析

Analysis on groundwater resources in deep-seated aquifers under condition of exploitation in Fuyang City

阜阳市由于大量集中开采深层孔隙水导致了区域内地下水位不断下降,从而引发了一系列的环境地质问题,如地下水降落漏斗、地面沉降等。为了更合理地利用深层孔隙水以及开展地面沉降防治方面的工作,根据阜阳市1989~2008年20 a均衡期内的地下水开采量以及地面沉降的统计数据,利用水量均衡法对开采条件下深层孔隙水的水资源量进行了计算。计算结果表明:在20 a的均衡期内,开采的深层孔隙水为7.5×10~8m^3,黏性土压密释水量(Q_压)为3.88×10~8m^3,其占比为51.73%,可以看出这是产生地面沉降的直接原因;越流量(Q_越)为3.18×10~8m^3,其占比为42.40%;弹性释水量(Q_弹)为0.44×10~8m^3,占比为5.87%。与多年开采总量8.78×10~8m^3相比,差值为1.28×10~8m^3,误差为14.58%(其误差应为侧向补给量所导致)。根据计算结果,提出了应制定控制地面沉降等地质环境方面问题的管控措施,合理激发浅层地下水对深层地下水的越流补给;同时应增加越流量在地下水开采资源量中的所占份额。

Because of massive concentrated exploitation of groundwater in deep-seated aquifers in Fuyang city,Anhui Province,the groundwater level declines,which induces a series of environmental geological problems such as groundwater depression cone formation and ground subsidence.In order to make more reasonable use of groundwater in deep-seated aquifers and to prevent and control the ground subsidence,according to the statistical data of groundwater exploitation and ground subsidence in the balance analysis period of Fuyang city from 1989 to 2008,the amount of groundwater resources in the deep-seated aquifers under the condition of exploitation is calculated by water balance method.The results show that the exploitation of groundwater in deep-seated aquifers is 7.5×108m3 during the balance analysis period.And the amount of water released from due to the cohesive soil is 3.88×108m3,a proportion of 51.73%to the total amount,which is the direct cause of the ground subsidence.The transaquifer flow is 3.18×108m3,a proportion of 42.4%;the elastic-releasing water is 0.44×108m3,a proportion of 5.87%.The total exploitation of groundwater resources is 8.78×108m3,1.28×108m3 larger than the exploited in deep-seated aquifers,the error is 14.58%,possibly caused by lateral supply.According to the calculation results,the suggestions are proposed to solve geological environment problems such as reasonable stimulation for transaquifer discharge from the shallow groundwater to the deep groundwater,as well as,increasing transaquifer groundwater exploitation.