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综合运用水文地球化学与同位素技术研究北大河流域地下水演化规律,研究区地下水水化学类型从上游到下游由HCO3-型向SO42--HCO3-型变化,再过渡到SO42-型;随着矿化度增大,各离子出现不同的增减速度,白云石和硬石膏的溶解引起Mg2+、SO42-增加,阳离子交换作用对Na+影响较大,Ca2+则受矿物溶解沉淀及离子交换等的共同影响,另外,蒸发浓缩也是影响研究区水化学的一个重要因素。地下水稳定同位素分布范围较广,δ18 O为-10.28～-7.85‰,δD为-65.07～-53.85‰,总体上,南盆地山前地带比细土平原同位素贫乏,南北两盆地地下水同位素差别不大,两盆地同位素氘盈余,反映了酒泉山前及浅层水是由现代河流渠系迅速补给,深层水是现代水和古水混合的,金塔地下水受人类活动影响较大,开发利用过程中一定要慎重。
The geochemical and isotopic techniques were used to study the evolution of groundwater in Peiliu River basin. The hydrochemical types of groundwater in the study area changed from HCO3-type to SO42-HCO3-type and then to SO42- type from upstream to downstream. With the mineralization The degrees of increase and decrease of ions are different. The dissolution of dolomite and anhydrite causes the increase of Mg2 + and SO42-. The cation exchange has a great effect on Na +. Ca2 + is affected by the dissolution and precipitation of minerals and ion exchange. Evaporation concentration is also an important factor affecting the hydration in the study area. The δ18O is -10.28 ~ -7.85 ‰ and δD is -65.07 ~ -53.85 ‰. Generally speaking, the isotopes of the groundwater in the southern basin are less than those of the fine soil plain, and the groundwater isotopes in the two basins are not so different The isotopic deuterium surplus of the two basins reflects that the Jiuquan piedmont and shallow water are replenished rapidly by the modern river drains. The deep water is a mixture of modern water and ancient water. The groundwater in the pylon is greatly affected by human activities. During the development and utilization Must be careful.