关于河北平原区深层地下水资源属性的探讨

摘要

以河北平原为例,采用同位素、地下水资源评价和地下水水位动态3种思路分析了深层地下水资源属性。根据实测地面沉降量反求深层地下水储存资源量的构成,确定了在以往的深层地下水资源计算时储存资源量少计算了32.77%,弹性释放系数比以往的数据大;根据深层地下水动态特征,分析认为深层地下水资源在同一水文年内可以得到部分恢复,在深层地下水降落漏斗区地下水循环速率将加大,并根据沉积学的观点,认为河北平原含水层在各期古河道带交叉重叠部位或在重叠部位附近可能是连通的,浅层地下水可以沿着各期古河道带沉积的砂性土构成的含水层向下补给深层地下水,其补给量远大于通过巨厚的黏性土层向深层地下水的越流补给。%Taking Hebei Plain as an example,the authors adopt isotope geology,groundwater resources evaluation and groundwater level dynamic method to analyze the property of deep-lying groundwater resources.The constitution of deep-lying groundwater exploitation is derived on the basis of the measured land subsidence data.It is determined that the previously calculated storage resource is 32.77% underestimated,and the data of elastic release coefficient at present is larger than the original data.According to the dynamic characteristics of deep-lying groundwater,it is proposed that the deep groundwater resources in the same hydrological year can be partially restored.In deep-lying groundwater funnel area,the groundwater circulation rate will increase,and according to the view point of sedimentology,the aquifer of the overlapping part of the ancient river and its vicinity is probably run-through.Shallow groundwater could pass downward along the aquifer of the ancient river sedimentary sand beds to recharge the deep-lying groundwater,and the amount of supply may be much greater than those recharges passing through the thick clay layer to the deep-lying groundwater resources.