基于遥感数据反演的南漪湖水质时空变化监测

Temporal and spatial variation monitoring of water quality from Nanyi Lake based on remote sensing data inversion,China

针对镇域水资源水质检测,在传统监测方法无法满足检测要求时,具有跨时空、大尺度、经济便捷等特点的遥感技术则可以很好地满足需要。以安徽省宣城市的南漪湖为例,以Landsat卫星影像为数据源,精确提取南漪湖水体,根据同期实测水质参数建立反演模型,对湖区内叶绿素a(Chl-a)、总磷(TP)、总氮(TN)浓度进行定量反演,根据Chl-a反演结果对南漪湖的营养状况进行评价。结果显示,南漪湖目前保持在轻度富营养状态,TP,TN含量超过三类水质标准,水质仍有恶化的趋势,水环境治理工作刻不容缓。

For the water quality detection of town water resources,when the traditional monitoring methods cannot meet the detection requirements,remote sensing technology with the characteristics of cross-space,large-scale,economical and convenient can well meet the needs.Taking Nanyi Lake in Xuancheng City,Anhui Province as an example,taking Landsat satellite images as data sources,this paper accurately extracts the body of Nanyi Lake.According to the measured water quality parameters at the same time,an inversion model was established to quantitatively invert the concentrations of chlorophyll a(Chl-a),total phosphorus(TP)and total nitrogen(TN)in the lake area.According to the inversion results of Chl-a,the nutritional status of Nanyi Lake is evaluated.The results showed that Nanyi Lake is currently in a slightly eutrophic state,with TP and TN contents exceeding the three water quality standards.The water quality is still deteriorating,and the water environment treatment is urgent.