The paper researches the status and mechanism of the seawater intrusion from the karst water source of Daweijia in Dalian City.By analysing the regional tectonic conditions,karst development regularity,and groundwater dynamics it focuses attention on studying the plane of seawater intrusion,the vertical distribution rule and the evolution process of seawater intrusion.The results show that the mechanism of seawater intrusion is complicated in this area and mainly affected by multiple actions such as geologic structure,karst development and the excessive exploitation of groundwater.In order to control seawater intrusion,it is necessary to control the extraction of groundwater,build the groundwater monitoring system of this region and establish the underground karst reservoir in the key sections of seawater intrusion.%对大连市大魏家喀斯特水源地海水入侵现状及机理进行了研究.通过分析区域地质构造条件、喀斯特发育规律、地下水动态,重点对海水入侵的平面、垂向分布规律及其演化过程进行了研究,结果表明海水入侵机理较复杂,主要受构造、喀斯特发育以及人工过量开采地下水等多种因素的影响.为了控制海水入侵必须采取控制地下水的开采量,同时要建立地下水动态监测系统,对海水入侵的重点地段必须建立地下喀斯特水库.
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