拒马河的水化学、同位素特征及其指示意义
Hydrochemical and isotopic characteristics of the Juma River and their implications
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摘要: 通过水文地球化学的方法来探究拒马河流域的河水与地下水之间的水力联系，从而为拒马河流域地下水的开采与管理提供一定的科学依据.因此，对太行山山前河流拒马河不同河段水样的水温、pH值、电导率、重碳酸根离子进行了现场测定，对水样中的K+、Na+、Ca2+、Mg2+、Cl-、SO42-、NO3-等阴、阳离子以及D和18O进行了实验室测定.7种常规离子的特征分析表明，拒马河不同河段水样水化学类型属于低矿化度的Ca-Mg-HCO3型水；δD和δ18O沿程变化特征表明拒马河河水在径流的过程中，δD和δ18O两者均沿程逐渐变化，并且都出现了富集的现象；氘过量参数沿程变化特征表明拒马河河水在径流的过程中发生"氧漂移"现象的原因主要是水/岩相互作用和蒸发作用，并且径流速度从整体来看比较缓慢；补给来源分析表明拒马河不同河段由大气降水补给，其化学成分是大气降水渗入地下经地下循环中各种水化学作用和蒸发作用影响的结果；补给高程的计算表明研究区内拒马河河段的补给高程在58—908 m之间，推断补给区很可能是北京西南部的中—低山区.Abstract: In order to provide scientific basis for the exploitation and management of groundwater of the Juma River basin the relationship between River and groundwater of the Juma River basin was explored through the hydrogeochemical method. Thus temperature pH,electric conductivity,and bicarbonate ion of water samples of the Taihang Mountain Piedmont Juma River were measured on site,and chemical and isotopic components in water such as K+,Na+,Ca2+,Mg2+,Cl-,SO42-,NO3- cation and anion etc.and D,18O were also tested in labs. The analysis results of the seven conventional ions indicated that the river water belonged to the low salinity of Ca-Mg-HCO3 type water. The evolution of δD and δ18O with disatnce indicated that δD and δ18O transformed gradually and the enrichment of δD and δ18O occured with distance when the river water flowed. The evolution excess deuterium with distance of indicated that the main reasons of oxygen isotope shift occurring in the process of the river runoff were water-rock interaction and evaporation, and the river runoff velocity was slow on the whole. Analysis of runoff-supplying sources indicated that the Juma River water was supplied by atmosphere precipitation, and the chemical composition of the water was the results of chemical water-rock interaction about atmospheric precipitation circular infiltration in the underground and evaporation. Calcula-tion of replenishment elevation indicated that replenishment elevation of Juma River in the study area ranged from 58 to 908 meters. It was deduced that the recharge area was likely to be middle-low mountainous area in southwestern Beijing.
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Key words:
- Juma River /
- hydrogeochemical characteristics /
- isotopic characteristics /
- implications
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