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引用本文:谢国清,李蒙,鲁韦坤,周伟民,余凌翔,李发荣,杨树平.滇池蓝藻水华光谱特征、遥感识别及暴发气象条件.湖泊科学,2010,22(3):327-336. DOI:10.18307/2010.0304
XIE Guo-qing,LI Meng,LU Wei-kun,ZHOU Wei-min,YU Lin-xiang,LI Fa-rong,YANG Shu-ping.Spectral features,remote sensing identification and breaking-out meteorological condi-tions of algal bloom in Lake Dianchi. J. Lake Sci.2010,22(3):327-336. DOI:10.18307/2010.0304
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滇池蓝藻水华光谱特征、遥感识别及暴发气象条件
谢国清1, 李蒙1, 鲁韦坤1, 周伟民1, 余凌翔1, 李发荣2, 杨树平2
1.云南省农业气象与卫星遥感应用中心, 昆明 650034;2.昆明市环境监测中心, 昆明 650034
摘要:
通过研究滇池蓝藻水华在可见光、红外谱段的光谱特征,并利用假彩色合成法以及归一化植被指数(NDVI)法进行了滇池蓝藻水华信息的遥感识别和提取,进而对提取结果进行了对比分析.结果表明:假彩色合成图的绿色区域和NDVI值大于-0.1的区域,为蓝藻水华区域.-0.1≤NDVI≤0.2时,轻度水华,像元内水华覆盖度为0-30%;0.20.4时,重度水华,水华浓厚,像元内蓝藻水华覆盖度为81%-100%.同时研究了激励滇池蓝藻水华暴发的关键气象因子和指标.滇池蓝藻水华暴发的关键时期是6-9月份,影响滇池蓝藻暴发的关键因子是日照和风速.6-9月份连续4-5h的光照,且风速≤2m/s的气象条件组合极易引起蓝藻水华暴发.
关键词:  MODIS  蓝藻水华  遥感识别  气象条件  滇池
DOI:10.18307/2010.0304
分类号:
基金项目:中国气象局蓝藻水体监测预警系统(一期)项目;昆明市环境保护局项目联合资助
Spectral features,remote sensing identification and breaking-out meteorological condi-tions of algal bloom in Lake Dianchi
XIE Guo-qing1, LI Meng1, LU Wei-kun1, ZHOU Wei-min1, YU Lin-xiang1, LI Fa-rong2, YANG Shu-ping2
1.Yunnan Agrometeorological and Satellite Remote Sensing Application Center, Kunming 650034, P. R. China;2.Kunming Environment Monitor Center, Kunming 650034, P. R. China
Abstract:
Based on high spectral reflectivity features of Blue-green Algal Bloom(BAB) in Lake Dianchi, by MODIS satellite re-mote sensing data, RGB;621 combined false color synthesis and Normalized Difference Vegetation Index(NDVI)method, we found that green region in false color synthesis image and the region with NDVI value>—0. 1 were just the BAB area. When—0.1,NDVI≤0. 2, slight BAB occurred, and bloom coverage in a pixel reaches 0—30%; when 0. 20.4,and bloom coverage in a pixel can be 81%—100%. From June to September is the key period for BAB breaking-out in Lake Dianchi, and the key factors to affect BAB breaking-out maybe sunshine and wind velocity. During this period, if the sunshine can last for only 4—5 hours and the wind velocity≤2m/s, it's quite easy for BAB breaking-out.
Key words:  MODIS  blue-green algal bloom  remote sensing recognition  meteomlogical condition  Lake Dianchi
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