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化学示踪剂是研究干旱区地下水化学演化和补给来源追踪的有效手段之一。本文以Cl-为示踪剂,通过其他离子与Cl-的相互关系对石羊河流域地下水演化特征及影响因子进行分析:Br-/Cl-、Na+/Cl-、S042-/Cl-、HCO3-/Cl-、Ca2+/Cl-、Mg2+/Cl-相互关系指示了流域中游地区地下水与地表水补给关系密切,水质较好,水化学作用以溶滤为主,蒸发也起到一定作用,下游盆地地下水矿化度较高,不完全是现代降水的补给,石膏、方解石溶解和阳离子交换作用使得地下水富镁。总体而言,石羊河流域地下水演化在多种地球化学作用下进行,在以蒸发为主导动力的条件下,水岩相互作用和阳离子交换过程促使地下水演化为现代特征。
Chemotracer is one of the effective methods to study the chemical evolution of groundwater and the source of recharge in arid areas. In this paper, Cl- as a tracer, through the relationship between other ions and Cl- Shiyang River Basin groundwater evolution characteristics and impact factors were analyzed: Br- / Cl-, Na + / Cl-, S042- / Cl-, HCO3 - / Cl-, Ca2 + / Cl- and Mg2 + / Cl-, indicating that the groundwater in the middle reaches of the river basin is closely related to the recharge of surface water, and the water quality is good. The water chemistry is dominated by leaching, and evaporation also plays a role. The groundwater in the basin has a high degree of mineralization, which is not completely the supply of modern precipitation. The gypsum, calcite dissolution and cation exchange make the groundwater rich in magnesium. Overall, the evolution of groundwater in the Shiyang River Basin is under a variety of geochemical processes. Under the conditions of evaporation as the dominant driving force, water-rock interaction and cation exchange process make groundwater evolve into a modern feature.