Estimation of Annual Total Nitrogen Load in Lake Basin with Remote Sensing
Estimation of Annual Total Nitrogen Load in Lake Basin with Remote Sensing
复制标题
湖流域年总氮负荷遥感估算
DOI：
10.11440/rssj1981.17.22
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发表时间：
1997
影响因子：
--
通讯作者：
Y. Yasuoka
中科院分区：
文献类型：
--
作者：
K. Oki;Y. Yasuoka
湖盆周围土地覆被变化导致水体环境恶化，如富营养化或水污染。特别是由于周边地区土地覆盖变化导致的湖泊氮、磷组分的增加较为严重。湖泊流域经河流进入湖泊的来水负荷估算在湖泊环境管理中具有重要意义。利用遥感技术研究了湖泊氮素总量与土地覆盖分布的关系。Kasumigaura湖被选为案例研究的试验场。分析了1979年、1984年和1990年的LANDSAT MSS数据，绘制了该地区的土地覆盖分布图。土地覆盖类型包括市区、水田、林区和农田。利用DEM对入湖的各条河流圈定了湖盆区域。分析了湖泊流域河流总氮与土地覆盖分布的关系。结果表明，在土地覆盖类别中，城市面积和农田面积对霞aura湖富营养化有影响。在此基础上，利用MSS数据的土地覆盖变化模式和各河流入湖总氮浓度估算了Kasumigaura湖的年总污染负荷（总氮），得出了Kasumigaura湖各土地覆盖类型总氮负荷的基本单位。
Land cover changes around lake basin have caused aquatic environmental degradation such as eutrophication or water pollution. In particular, increase of nitrogen and phosphorus components to the lake due to land cover changes of surrounding areas has been serious. Estimating influent loads from lake basin to the lake through rivers is very important in the management of lake environment. In this paper, the relation between total amount of nitrogen to the lake and land cover distribution was investigated with remote sensing. Lake Kasumigaura was selected as a test site for the case study.LANDSAT MSS data from 1979, 1984 and 1990 were analyzed to produce land cover distribution map of the area. Land cover categories include urban area, paddy field, forest area and field. Lake basin areas were delineated with DEM for individual rivers to the lake. And the relation between total nitrogen of rivers and land cover distribution at the lake basin was analyzed. As a result, it was found that urban area and field in the land cover categories gave influence to the eutrophication of Lake Kasumigaura. Furthermore, in order to evaluate total annual pollution load (total nitrogen) to Lake Kasumigaura,(1) basic unit of total nitrogen load for each land cover categoris(2) influent annual total nitrogen to the lake were estimated from land cover change patterns from MSS data and from the total nitorgen concentration measured at each rivers to the lake.