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绍兴鉴湖水域环境功能区区划 总被引:47,自引:6,他引:41
研究了25C条件上太湖北部湖区水-沉积界面的物质交换.结果表明:五里湖沉积物中的氮,磷和CODmn的释放程度明显高于梅梁湖,其NH4+-N、DTP和DCOD的平均溶出速率分别人158.2,2.05和27.8mg/(m2.d);梅梁湖北部湖区形态氮处于“负释放”状态,DTP和DCOD溶出速率分别为0.584mg/(m2.d)和8.9mg/(m2.d),此外,形态氮,磷和DCODR的水-沉积物界面物质交换量与底泥中氮,总 相似文献
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通过航片判读,湖泊成因和流域社会经济环境的分析,利用自然地域区块为基础,应用图件叠加法,Q值评价法,环境发展-治理的评价法及质聚类评价法等综合分析,将鉴湖水域划分为四个环境功能区,所划分的功能区成功地应用于鉴湖环境容量和水质规划,并被绍兴环保局在管理上推广应用。 相似文献
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太湖流域浙西区不同土地类型的面源污染产出 总被引:34,自引:1,他引:33
以太湖流域浙西水利分区为研究区,采用Arcgis的水文分析模块,对浙西区进行流域划分,选取以单一农业用地为主的子流域,利用GIS叠加分析方法,获取各子流域的降水、径流深度、土地利用结构信息,分析研究区主要土地利用类型与径流量的统计关系,建立该区年尺度的径流估算模型。基于林地、耕地为主的子流域水质监测数据,结合径流估算模型,分析占该区90%土地利用面积的林地、耕地与径流污染物浓度的定量关系,研究结果显示,该研究区以林地为主的流域径流各水环境指标为:COD浓度为2.95 mg/l,BOD浓度为1.080 mg/l,总氮浓度为0.715 mg/l,总磷浓度为0.039 mg/l;耕地为主的流域径流水环境指标为:COD浓度为5.721mg/l,BOD浓度为3.097 mg/l,总氮浓度为2.092 mg/l,总磷浓度为0.166 mg/l。这一研究结果适合应用于太湖流域上游山区、丘陵地区年尺度面源污染估算。 相似文献
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Ge湖氮,磷平衡研究 总被引:2,自引:3,他引:2
Ge湖位于江苏省常州市西南13km处,水面面积164km^2,平均水深1.26m,是太湖湖洋的重要组成部分。其氮、磷平衡研究结果表明:①入湖氮、磷总量分别为4120.29t/a和270.03t/a;其中以河道入湖量最大,分别占入湖总量的71.9%和57.1%,其次是养殖投饵,分别占入湖总量的12.4%和29.9%;氮、磷的滞留系数分别为0.36和0.35,年滞留量分别为1481.6t和94.82t 相似文献
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This paper takes Zhexi hydraulic region in Taihu Basin as a study area. On the basis of hydraulic analysis function of Arcgis8.3, the drainages were delineated by selecting the monitoring points and discharge stations as outlets. The landuse map were finished by denoting the TM/ETM image. The precipitation map was finished by spatial interpolation according to the rainfall monitoring records. Overlaying the drainage boundary, landuse map and precipitation map, the rainfall, different landuse type area, and runoff pollution concentration and runoff were calculated. Based on these data in different sub-watersheds, by Origin7.0 regression tool, an equation is established to predict runoff using the relationships between runoff, precipitation depth and land use patterns in each of the sub-watersheds. Selecting the sub-watershed which is mainly composed of forest landuse type, the mean runoff concentration (MRC) from sub-watershed has been estimated. The mean runoff concentration of farmland has been estimated by the same methods after the contribution of forestlanduse type was removed. The results are“ for the forest landuse type, the mean runoff concentrationsof COD, BOD, Total N and Total P are 2.95 mg/l, 1.080 mg/l, 0.715 mg/l, and 0.039 mg/l,respectively; for the farmland, the mean runoff concentrations of COD, BOD, Total N and Total P are 5.721 rag/l, 3.097 rag/l, 2.092 rag/l, and 0.166 rag/l, respectively. By using these results, the agriculture non-point pollution loads have been assessed. The loads of COD, BOD, Total N and Total P in Zhexi region are 14,631.69 t/a, 6401.93 t/a, 4281.753 t/a and 287.67 t/a, respectively. 相似文献