根据汇水流向,借助GIS进行罗源湾汇水区的划分;在ENVI软件下利用遥感分析技术提取土地利用类型;结合研究区域内主要溪流的水质监测结果和土地利用现状,利用反推法计算出农田污染单位面积COD负荷.在此基础上,采用排污系数法和单位面积污染负荷法分别计算出各汇水区农村生活污水、畜禽养殖、农田和村镇建设用地降雨径流的COD排放量.结果表明罗源湾入海非点源污染COD总排量为11 446.44 t/a,其中农村生活污水的COD排放量最大,约占38.9%,其次是畜禽养殖、农田和村镇建设用地降雨径流污染.最后提出非点源污染控制的建议.According the flowing direction,the watershed in Luoyuan coastal zone was segmented with GIS technology.The landuse information was extracted from TM image.With water quality data and landuse information,the unit-area load of COD from farmland runoff was estimated by means of reverse educing.Consequently,COD discharges from household wastewater,livestock cultivation and the runoff from farmland and construction land were estimated using discharge coefficient and unit-area load approaches.It is estimated that total COD discharge from non-point pollution into Luoyuan Bay was 11 446.44t/a.The household wastewater was the biggest source of non-point pollution which accounts for 38.9%.The second source was livestock cultivation.The COD discharge from the runoff of farm and the construction land was the least.Advices to control non-point pollution were put forward in this paper.福建省海洋与渔业局2005年重点资助项目(T04903
