咸淡水界面空间分布特征演变的野外观测

发布时间：2018-03-05 17:00

本文选题：咸淡水界面　切入点：水力梯度　出处：《中国科学院大学学报》2017年05期 　论文类型：期刊论文

【摘要】：对于咸淡水交互界面空间分布特征传统研究主要以室内模拟为主。为克服尺度效应和地层分布的非均质性,以威海市环翠区双岛镇西山村双岛港东北部为研究对象,从山前—滨海区选择一个典型剖面,在海水涨落的一个周期内,对地下水水位和水质进行观测,通过水化学分析结合多元统计等方法,精确刻画咸淡水界面的时空分布特征。结果表明,实验剖面上X5点处咸淡水界面以0.9 m埋深为中心、倒U字形入侵,垂向上位于埋深0.3~1.5 m之间,入侵强度为0.9 m0.6 m1.2 m1.5 m;咸淡水交互界面在重力作用下向下方短距离迁移,且呈现咸水入侵速度快,回淡速度慢的趋势;界面上水化学类型的变化主要表现为由重碳酸型水转换为氯化物型水的一个循环往复的过程。
[Abstract]:In order to overcome the scale effect and the heterogeneity of stratigraphic distribution, the northeast of Shuangdao Town, Xishan Village, Huancui District, Weihai City, was taken as the research object, in order to overcome the heterogeneity of the scale effect and stratigraphic distribution. Selecting a typical section from the front of the mountain to the coastal area, observing the groundwater level and water quality during a period of sea water fluctuation, and combining the method of hydrochemical analysis with multivariate statistics, etc. The characteristics of temporal and spatial distribution of salt-fresh water interface are accurately described. The results show that the interface of salt-fresh water at point X5 is centered at 0.9 m depth and invades in inverted U shape, and vertically lies between 0.3 and 1.5 m in depth. The invasion intensity is 0.9 m0.6 m1.2 m1.5 m.The salt-fresh water interaction interface migrates downwards short distance under the action of gravity, and shows the trend of fast salt water invasion and slow desalination. The change of chemical type of water at the interface is mainly a cyclic process of conversion from bicarbonate water to chlorinated water.
【作者单位】：中国地质科学院水文地质环境地质研究所;
【基金】：中国地质科学院水文地质环境地质研究所所控基金项目(SK201602) 中国地质调查局地质调查项目(DD20160241)资助
【分类号】：P641;P731.2

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