吴灵地区地下水同位素特征及可更新能力研究

Study on Groundwater Isotope Characteristics and Renewable Capacity in Wuling Region

为研究吴灵地区地下水同位素特征及更新能力,利用氢氧稳定同位素确定了研究区不同区域地下水的补给特点,并利用放射性同位素~3H的计时作用,结合全混模型,分别计算平原区及台地区的地下水年更新速率。结果表明:大部分平原区潜水更新速率小于0.1%/a,地下水开采量较大的地区为10.1%~10.5%/a;台地区的潜水更新速率整体上为1.8%~3.1%/a。总体上研究区承压水更新速率小于0.1%/a,地下水开采量大的区域更新速率可达2.2%/a。

In order to study on groundwater isotope characteristics and renewable capacity in Wuling region,this paper used the value of sta-ble isotopes δD and δ180 to determine the recharge characteristic of groundwater in different areas. Using the timing action of radioisotopes 3H and combining with full mixed model,it calculated the average renewal rate of groundwater in plain and tableland of the study area respec-tively. The results show that the most of the plain unconfined water renewal rate is less than 0.1%/a and in the larger groundwater exploitation larger areas it can reach 10.1%-10.5%/a; As a whole, the renewal rate of confined water in the studied area is less than 0 .1% /a and in thelarger groundwater exploitation larger areas it can reach 2.2%/a.