氘过量参数及其水文地质学意义--以四川九寨沟和冶勒水文地质研究为例

根据四川九寨沟和冶勒地区各种水体的同位素资料,讨论了反映大气降水蒸发、凝结过程的不平衡程度的氘过量参数(d=δD-8δ18O)在降水和地下水中的主要变化特点及影响因素,对比了岩溶水和非岩溶水中氘过量参数d值的变化情况以及与水体氚含量变化的相关规律性.指出氘过量参数d值,是研究水/岩作用、地下水动力学和地表径流动态组成的一个十分重要的参数指标,具有极为重要的水文地质学意义.

Deuterium excess parameter and geohydrology significance

Based on the isotope information from the different water bodies in Juzaigou and Yele areas, Sichuan, the paper discusses the main variation features and the effect factors of the deuterium excess ( d excess) parameter which reflects the evaporation and condensation non equilibrium degree in precipitation formation processes in precipitation and groundwater, contrasts the variation situation of the deuterium excess parameter ( d excess) between the karst water and the no karst water, and the relative regularity with the tritium content variation in the water bodies, and points out that the d excess is a very important parameter for researches on the water/rock interaction, the groundwater dynamics and the runoff formation mechanism and of very important geohydrology significance.