中文摘要：

海岛是一种独特的生态系统,由于其特殊的水文地质条件,水资源相对比较贫乏,一般都依靠地下水维持岛上生产生活用水,如果地下水质受到影响,则会带来较大的风险。岛内地表淡水湖泊水体污染严重。为了解决岛内地表淡水湖泊水体污染问题,决定调用海水对其进行稀释,而这一方案则有可能造成引水工程沿线海水侵入地下水问题。本文采用有限元方法分析从厦门西侧的筼筜湖经松柏湖调水到钟宅湾对周围地下水质和湖库水体的影响,以及在丰水年和枯水年湖库水体和海水水体之间的补给关系。分析表明：工程在一年左右对周围地下水的影响将趋于稳定,工程沿线150~800m范围内地下水的盐度产生了明显变化。在枯水年,由于地下水位下降,海水有可能会补给湖库,引起湖泊盐度升高,对工程沿线特别是饮用水备用水源湖边水库造成潜在的威胁。

英文摘要：

Drastically influenced by human activities, the water quality of the Middle Lake of Xiamen Island has been seriously polluted. In order to alleviate water pollution of the lake, a project was planned. It is the sea water diversion project from west to east. The project will change groundwater environment. The most important the impact in on the ground water environment of the whole island. Will the project improve water quality without causing extra problems？ Will it decrease sea water invasion, groundwater - seawater interaction, and nutriment reciprocation between freshwater bodies and sea water as well？ By adopting the Finite Element Method , a conceptual model is set up to analyze groundwater flow and sea water transportation with a mathematical model. The conclusions are （1） in annual average precipitation years, the sea water invasion will persist in one year after the project is finished, and （2） sea water level will be close to adjacent place on the lakeside. Consequently, there may be, in low water years, reverse supply of sea water to lake water through groundwater flow, which will cause salinity rise, water quality decline, and deterioration of drinking water sources of some areas.