辽东湾海域水体富营养化的模糊综合评价

Fuzzy Comprehensive Evaluation of Water Eutrophication in Liaodong Bay

基于2007年夏季辽东湾海域的水质监测资料,以高锰酸盐指数(CODMn)、溶解无机氮(D IN)、磷酸盐(PO43--P)和溶解氧(DO)为海水富营养化评价指标,运用模糊综合评价方法并对其中的评价等级确定方法加以改进,评价了辽东湾海域水体富营养化状况,分析了水体富营养化的关键因子和控制性因素.结果表明:对评价方法的改进,取得了较好的效果;辽东湾沿岸和河口口门附近海域已达到富营养化程度,而海湾中部则处于贫营养状态,富营养化程度从海湾中部向近岸逐渐增加;影响辽东湾海域水体富营养化的关键因子为无机氮;辽东湾海域的富营养化水平主要受入海河流冲淡水影响范围的控制.

Based on water quality data of CODMn, DIN, phosphate and DO concentrations collected in the Liaodong Bay in summer 2007 and the method of fuzzy comprehensive evaluation with improvements in rank level determination method, the eutrophication status in this region was evaluated, then the key indices and controlling factors were analyzed. The results indicated that the improvements to the evaluation method obtained good results. The coast and estuary of Liaodong Bay were eutrophied already, while the central areas were oligotrophic. The eutrophication level increased from the central to the coastal areas. The key eutrophication index was DIN, and the eutrophication status was primarily controlled by the influential range of the diluted water in the Liaodong Bay waters.