摘要
在水化学数据分析的基础上,该文运用~2H、~3H、^(18)O、^(14)C等同位素对玛纳斯河流域平原区地下水的补给来源、地表水与地下水以及地下水内部的相互关系进行了研究。研究表明:1)从平原区上游至下游,地表水、地下水的TDS值逐渐升高(或平原区中游至下游基本不变)。随着TDS的增大,水化学类型由HCO_3—Ca—Mg水向SO_4—Cl—Na水演化,水质变差。2)地表水、浅层地下水和深层地下水的δ~2H、δ^(18)O呈现出明显的分布规律。3)平原区地下水主要补给来源为南部山区的大气降水,地表水是联系南部山区大气降水与平原区地下水的重要纽带。4)研究区内存在一条经由地表水与年龄相对较老的深层地下水的主要混合线。平原区上游的地下水主要由大气降水、地表水(或包括年龄相对较老的深层地下水)等经这条混合线混合形成;平原区中游的地下水主要由平原区上游的地下水与年龄相对较老的深层地下水等经这条混合线混合而成;平原区下游的浅层地下水主要由平原区中游的地下水经蒸发作用形成;而深层地下水则主要由混合作用形成。
In the plain of Manas river basin, based on analysis of hydro-chemical data, isotopic compositions 2H,3H, 18O, and 14C have been applied to study the source of recharge, the relationship between surface water and groundwater and relationships among inner portions of groundwater. Study results indicate： 1） from upriver area to downstream area, the TDS of surface water and groundwater increases gradually （or almost doesn＇t change from the middle reaches to downstream area）. And with the increasing of the TDS, the hydro-chemical types vary from HCO3 - Ca- Mg into SO4 - C1 - Na, and the quality of water worsens.2）The δ2H,δ18O of surface water, shallow groundwater and confined water present distinct distribution pattern. 3） Groundwater in the plain is mainly recharged by the precipitation in the southern mountainous area, and surface water is an important link between them.4） In the study area, there is a major mixing line via surface water and older age confined water. Upriver groundwater in the plain is originated from the mixture of precipitation, surface water （or include older age confined water） etc. along the mixing line mostly. Groundwater in the middle reaches in the plain is also formed by the mixing of upriver groundwater and older age confined water etc. along the mixing line mainly. And downstream shallow groundwater in the plain is derived from the evaporation of groundwater in the middle reaches of river in the plain mostly, but confined water is originated from the mixing effect.
出处
《勘察科学技术》
2010年第2期18-23,共6页
Site Investigation Science and Technology
基金
中国地质调查局工作项目
编号:200310400034
