山东文登抽水蓄能电站尾水洞段地下水连通性的环境同位素和水化学研究

基于对分布于山东省文登地区黑豹泉地下水子系统（Ⅰ2）及其相邻的六度寺沟地下水子系统（Ⅰ1）和苇夼沟地下水系统（Ⅱ）内的11个水样品的3H（D,氘）、2H（T,氚）、18O同位素和水化学成分的分析结果,对文登抽水蓄能电站尾水洞段地下水的连同性进行了研究。研究结果表明,黑豹泉地下水子系统（Ⅰ2）及其相邻的六度寺沟地下水子系统（Ⅰ1）和苇夼沟地下水系统（Ⅱ）内的地下水特征在环境同位素和化学成分方面都具有明显的差异,具有各自的补、径、排条件。尤其是在黑豹泉地下水子系统（Ⅰ2）内,以F12断层为边界,其南部和北部两个区域的地下水的特征,不具有相似性,故二者之间的水力联系不密切,表明F12断层为阻水断层。同时,利用数值方法和泉域水均衡方法结果表明探洞的开挖对该区的地下水位变化的影响不太大。但是由于该区是一个四周由隔水边界组成的相对封闭体系,除大气降水外无其他固定的汇水源头。因此,在长时间内,不采取任何措施的情况下,水位将会继续下降。

ENVIRONMENTAL ISOTOPES AND GEOCHEMICAL STUDY FOR GROUNDWATER CONNECTIVITY IN THE AREA OF TAILRACE CHANNEL OF THE PUMPED STORAGE POWER PLANT,WENDENG,SHANDONG PROVINCE,CHINA

In general,geochemical and isotopic compositions are very different among different types of water or groundwater.Therefore,the distribution,origin,and age of different water can be determined by analyzing their isotopic compositions and variation.In this paper,the authors introduced the isotopic and geochemical approaches into the study of hydrogeologic investigation relating to the major engineering projects.The relationship among different groundwater systems are firstly investigated,based on which the influence of engineering constructions on local groundwater system is analyzed.Based on environmental isotopes 3H（D）,2H（T）,18Oand geochemical analyses of 11 water or groundwater samples in the study area,the relationship among the Heibao spring groundwater system（Ⅰ2）,the Liudusigou groundwater system（Ⅰ1）,and the Weihangou groundwater system（Ⅱ）in the area of tailrace channel of the pumped storage power plant,Wendeng,Shandong Province,China is studied.The result indicate that there are big different characters in both environmental isotopes 3H（D）,2H（T）,18O and geochemical component in these three groundwater systems with different conditions of recharge,flow,and discharge.Especially in the groundwater system of the Heibao spring（Ⅰ2）,there is almost no common basic character of groundwater between the south and north areas separated by the fault F12.This indicate that the fault F12 is impermeable.At the same time,the result of numerical simulation and hydrologic budget method state that there is no big influence on the water table of this area during the excavating of exploratory tunnel.However,water table will continue to decline during excavation with no any long-term control measurements because the closed groundwater system is composed of impervious boundaries with only rainfall recharge.The current research successfully confirms that geochemical approaches such as isotopic analysis can be used for handling related engineering hydrogeologic problems,especially for the groundwater problems in water-power engineering.