摘要
针对传统的水文地质学中地下水资源被定义为可逐年得到恢复的地下淡水量,本文通过分析含水层系统的组成特点、含水层和弱透水层的释水特征,揭示了地下水资源的永久性消耗机理。结合苏锡常地区近30年内大规模开采地下水资源过程中地下水位变化以及地面沉降的实测数据,研究了地下水被大量抽取后含水层系统的永久性压缩。含水层系统的释水变形直接导致了永久性的地面沉降和地下水储存空间的缩减,原本储存在含水层系统中的部分地下水资源将无法得到恢复储存,无法恢复的这部分地下水资源其实已被永久性地消耗了。永久性消耗的地下水资源总量与地面沉降的总体积基本一致,结合苏锡常地区含水层系统常年开采后引起的地面沉降量估算,得出永久性消耗的地下水累计量约占该区域地下水开采总量的41.8%~65.8%。
The recoverable property is the main characteristic of groundwater resource as the definition of groundwater according to traditional hydrogeology. In the present work, the water release properties of the constitutional units of groundwater system including aquifer and aquitard were analyzed respectively. The mechanism of groundwater depletion during mining has been revealed. Meanwhile, according to the onsite measured data of groundwater table fluctuation and land subsidence in the Su-Xi-Chang area during the past 30 years, the perpetual settlement which caused by the widespread groundwater withdraw is studied. The aquitard water release induces the plastic deformation and the storage space of groundwater resource would be compressed correspondingly. Hence,the groundwater which originally stored in aquitard could not be stored again due to the plastic deformation, and the part of groundwater resource could be considered as depleted. The total mass of groundwater depletion is equal to the volume of ground settlement. Meanwhile,the groundwater depletion is about 41.8% ~65.8 % of accumulative groundwater withdraws based on the groundwater pumping induced land subsidence and drawdown of the Su-Xi-Chang aquifer system.
出处
《水利学报》
EI
CSCD
北大核心
2014年第12期1458-1463,共6页
Journal of Hydraulic Engineering
基金
国家自然科学基金资助项目(41172204)
水利部公益性行业项目(201301083)
