在人类高强度开发和强烈的陆海相互作用背景下，我国河口海岸带地区地下水资源和水环境问题日益加剧。本项目拟以长江口滨海典型区域为研究对象，重点研究浅层地下水水化学特征（主要盐分、营养盐和金属等离子）及其影响作用机制。旨在通过大量野外监测、室内分析和模拟试验，阐明长江口南（浦东）、北（启东）两翼和崇明岛东滩滨海环境中浅层地下水的水化学特征的时空分布规律；揭示典型滨岸区域不同成土阶段、土地利用方式和潮间带地貌条件下滨海浅层地下水化学特征及其季节性变化规律；分析农田耕作周期、潮汐作用咸淡水交替周期内浅层地下水化学的动态变化过程；重点探讨营养盐（N、P、Si等）和金属（Fe、Mn、Al等）等在长江口复杂环境系统中的水土界面相互作用机制及其对地下水的影响；评价长江口区域浅层地下水环境质量及其生态环境效应，为长三角地区滨海水土地资源开发利用和环境保护提供科学依据。

Under the background of the high-strength exploitation and intense land-sea interaction, the problem of the groundwater resources and environment quality is aggravated increasingly on the estuarine and coastal area. In the present project, the study area is focus on the typical coast zone in the Yangtze estuary, the distribution and its influencing mechanism of hydrochemical characteristics (about salt ions, nutrients and metals) in the shallow groundwater will be investigated. Based on lots of field sampling and environmental monitoring of groundwater and chemical experiment and analyses, it is aim 1）to show that the spatial-temporal distribution of hydrochemistry in the shallow groundwater in coastal zone along the both wings（south-Pu Dong and north-QiDong ）and the eastern flat (Dongtan) of Chongming island； 2）to know the seasonal change of the shallow groundwater hydrochemistry in the different ages of soil formation, different landuse type and different tidal flats, and the dynamic change of the shallow groundwater hydrochemistry during the cycle of field husbandry and tidal periods. It is important to discuss the interaction and influencing mechanism of chemical substances in the complex water-soil system of coastal environment in the Yangtze estuary. The risk of environmental quality and effect of shallow groundwater will estimate for the wise use of the land and water resources and environment protection on the coastal area of the Yangtze delta.