Seawater quality assessment is the foundation of mastering status of water environment and managing seawater quality. At the same time, studies that discuss the theoretical form of seawater quality assessment have an important and practical meaning,introducing three ways of analyzing sea-water quality, which are color clustering comprehensive water quality series methods paste degree method and matter element analysis method. Besides,by valuing the seawater quality of east offshore area culture zone in Zhoushan and comparing among results, introducing characteristics, evaluation models,usages and standards of these methods,and clarifies the concrete application in water quality assessment.%海水水质评价是掌握水环境状况和进行海域水质管理的基础,同时研究水质评价理论模式有着极其重要的现实意义。通过对舟山市东极离岸网箱养殖区的海水水质状况的评价及结果的比较,来了解灰色聚类综合水质级数法、糊贴近度法和物元分析法的特点和评价模式及其在海水水质评价的使用方法与规范和其在水质评价中具体运用。
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