基于GIS的长海海域环境信息分析

搜集长海海域海洋环境信息数据,结合水质综合评价、富营养化评价模型,采用GIS技术分析了长海海域环境质量。结果表明,长海海域pH、溶解氧空间分布比较均匀,大部分海域符合一类海水水质标准;石油类浓度均较低;化学需氧量、活性磷酸盐、无机氮空间分布相似,岛屿周边及岛屿之间浓度较高,而在海域开阔处浓度较低,分析主要受养殖活动和水体交换能力的影响;长海海域水体质量整体处于清洁水平,大部分海域未出现富营养化,只有在广鹿岛、大长山岛、乌蟒岛、海洋岛邻近海域出现轻度富营养化。

Analysis on Marine Environmental Information of Changhai Sea Area Based on GIS

The marine environmental quality in Changhai sea area was analyzed by GIS in combination with the comprehensive evaluation of wa-ter quality and eutrophication evaluation model based on the data of water quality.The results showed as followed:the spatial distribution of pH and dissolved oxygen in Changhai sea area was fairly uniform,and most of the sea areas met the standards of first-class seawater quality;petrole-um concentration was low;the chemical oxygen demand,dissolved inorganic phosphorous and dissolved inorganic nitrogen were similar in spatial distribution;the concentration between the islands and the neighborthhood of islands was higher while the concentration was low in the open sea, perhaps it was mainly influenced by the farming activities and water exchange;the water quality in Changhai sea area was in good condition as a whole;there was no eutrophication in most areas,and only mild eutrophication occurred in the areas close to Guanglu Island, Dachangshan Is-land,Wumang Island and Haiyang Islands.