标题:
基于Landsat数据的洱海蓝藻动态变化监测The Dynamic Monitoring of Erhai Cyanobacteria Based on Landsat Data
作者:
李泠潞, 李嘉璇, 成功
关键字:
蓝藻水华, 叶绿素a, 动态监测, LandsatCyanobacteria Bloom, Chlorophyll-a, Dynamic Monitoring, Landsat
期刊名称:
《Journal of Water Resources Research》, Vol.5 No.2, 2016-04-27
摘要:
近年来，位于云南省境内的洱海湖区蓝藻水华现象频发引起了人们的关注。叶绿素a是水体初级生产力的重要指标，可以有效反映浮游植物生物量状况及其变化趋势。本文选取了蓝藻水华易爆发期(2009年5月~11月)洱海湖区Landsat TM/ETM+数据，在对图像进行了辐射定标、大气校正、条带修复等预处理的基础上，运用41.57 × (TM3 + TM4) − 0.697波段组合模型对其进行叶绿素a浓度反演，反演结果表明，洱海湖区叶绿素a含量逐渐升高，在10月份达到了峰值，11月开始下降。各时相叶绿素a浓度反演结果与实际采样分析结果基本一致，验证了利用Landsat TM/ETM+数据进行洱海湖区叶绿素a浓度动态监测的有效性。该方法具有周期短、信息丰富、现势性强、成本低等优势，值得进一步推广。
In recent years, algal bloom occurring in Erhai frequently attracts wide attention. The chlorophyll-a concentration, which can effectively reflect the status of phytoplankton biomass and its change trend, is an important parameter for evaluating primary productivity of the water. Using the Landsat TM/ETM+ remote sensing images when cyanobacteria bloom erupted (from May to November in 2009), after pre- processing like radiometric calibration, atmospheric correction and destriping on the images, the chlo-rophyll-a concentration was quantitatively inversed by the band combination of 41.57*(TM3 + TM4) − 0.697. The results showed that chlorophyll-a concentration in Erhai Lake increased gradually and reached the highest value in October, then decreased in November. Chlorophyll-a concentrations in each phase inversion result are consistent with the actual results of sampling and analysis that demonstrates the effectiveness of the use of Landsat TM/ETM+ data on dynamic monitoring chlorophyll-a concentration of Erhai Lake. This method is worthy of further promotion with short period, rich information, high actuality and low cost.