Naozhou island in Zhanjiang city is an island near the mainland,where groundwater is the important source of water for residents' living and industrial and agricultural production on the island.The problem of the seawater intrusion has appeared in the Naozhou Island due to the long term and unreasonable water exploration,which has caused serious effects on residents' life and production.Therefore,this paper establishes the numerical model of seawater intrusion by using MODFLOW and MT3D module of GMS to predict the developing trend of the seawater intrusion during the period of 2016 to 2020 in Naozhou island.The results show that seawater intrusion range of shallow aquifer in Naozhou island reaches 1km and owing to the transfluence,there appears a phenomenon of seawater intrusion locally in the middle aquifer of the western and northern coastal areas.In order to prevent the further deterioration of seawater intrusion in Naozhou island region,it is recommended to optimize and control the exploration of shallow groundwater,to adjust the exploration plan of middle and deep groundwater.In addition,to improve the dynamic monitoring network of groundwater and eventually to take effective measures to prevent the further deterioration of seawater intrusion.%硇洲岛是湛江市的一个近大陆岛屿,地下水是岛上居民生活和工农业生产用水的重要水源.由于长期不合理开采,已经出现海水入侵的问题,对硇洲岛居民生活和生产造成了影响.为此,本文在收集整理分析相关调查资料的基础上,采用GMS中的MODFLOW和MT3D模块建立了硇洲岛海水入侵数值模型,对硇洲岛2016年~2020年的海水入侵发展趋势进行了预测.结果表明,硇洲岛浅层含水层海水入侵范围达到1 km,中层含水层在西部和北部沿海地区由于越流作用,局部出现了海水入侵现象.为了防止硇洲地区海水入侵进一步恶化,建议优化控制浅层地下水开采量,调整中深层地下水开采方案,进一步完善地下水动态监测网,采取有效措施防止海水入侵进一步发展.
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