新疆叶尔羌河流域地下水同位素特征及其补给来源分析

Isotope features and supply sources of groundwater in the Yarkant River drainage area,Xinjiang

笔者以新疆叶尔羌河流域为例,在研究区水文地质调查的基础上,根据不同区域、不同深度D、^(18)O和T值的变化分析地下水补给来源.解决了传统研究方法很难解决的问题.为干旱地区地下水起源及空间分布规律研究提供了新思路。研究结果表明:(1)研究区地下水不是来自大气降水的直接入渗,而是地表水渗漏补给。(2)流域分为两个独立的地下水循环系统,分别接受叶尔羌河与提孜那甫河河水补给。(3)潜水和承压水的起源相同,属统一的地下水系统。(4)地下水径流表现为倾斜平原区径流强烈,地下水以水平运动为主;细土平原区地下水径流迟缓,地下水以垂直蒸发运动为主.径流方向与地表水流向密切相关。

On the basis of hydrogeological investigation of the Yarkant RAver drainage area, Xinjiang, the authors analyze the sources of groundwater recharge according to the variations of D, ^18O and T values in different regions and at different depths, solve the problem that is difficult to solve with the traditional research approach and provide a new idea for the study of the origin and spatial distribution of groundwater in arid areas. The results indicate that：（1） the groundwater is not derived from direct infiltration of precipitation but from seepage recharge of surface water; （2） there are two independent groundwater circulation systems which receive the waters of the Yarkant RAver and Tiznap RAver respectively; （3） the origins of phreatic water and confined water are the same, belonging to a unified groundwater system;and （4） in the sloping plain area the groundwater runoff is strong and groundwater movement is mostly horizontal, while in the fine soil plain area, the groundwater runoff is sluggish with vertical evaporative movement predominating and the runoff direction is closely related to the flow direction of surface water.