基于TM影像的克钦湖叶绿素a浓度反演  

Inversion of Chlorophyll-a Concentration Based on TM Remote Sensing Image in Keqin Lake

作　　者：李苗[1] 臧淑英[1] 吴长山[1] 

机构地区：[1]黑龙江省普通高等学校地理环境遥感监测重点实验室,哈尔滨师范大学,哈尔滨150025

出　　处：《农业环境科学学报》2012年第12期2473-2479,共7页Journal of Agro-Environment Science

基　　金：国家自然科学基金项目(41030743;41171322);黑龙江省高等学校科技创新团队建设计划项目(2010td10)

摘　　要：为了研究扎龙湿地克钦湖的富营养化情况,利用准同步实测数据和Landsat-5/TM数据反演整个克钦湖的叶绿素浓度。在对叶绿素光谱特征研究的基础上,选取TM2、TM3、TM4单波段及其11种波段组合与叶绿素a浓度进行相关性分析,将相关系数较大的3种波段组合分别建模,得到3个估算叶绿素浓度的反演模型,选择精度较高的模型Y=41.57×(TM3+TM4)-0.697反演了克钦湖叶绿素a浓度。通过分析结果得出:克钦湖的水体叶绿素浓度分布总体上是南湖比较低,北湖较高,大的趋势是由南向北递增。这与准同步水质采样数据基本吻合,反映了克钦湖富营养化状态的实际情况。该模型可以较好地估测克钦湖水体叶绿素a的浓度,可以满足该水体叶绿素a含量定量监测的需要,对水体水质的动态监测和预警提供理论依据。The concentration of chlorophyll-a not only reflect the water plankton but also the distribution of primary productivity.The change of concentration is often used as a basic indicator to measure the extent of water eutrophication.In order to investigate the eutrophication of Keqin Lake,chlorophyll-a concentration was inversed based on the quasi-synchronous measured data and Landsat-5/TM image of Keqin Lake.By researching the spectral characteristics of chlorophyll-a,correlation analysis was made between the chlorophyll-a concentration and the 14 kinds of combinations of TM2,TM3 and TM4.Then 3 models were established by results which correlation coefficient were higher.Finally,chlorophyll-a concentration of Keqin Lake was inversed by suitable model which was Y =41.57 ×（TM3 ＋TM4）-0.697.The results showed that chlorophyll-a concentration of Keqin Lake was relatively low on the whole south lake,high on the north lake and with a increas-ing tendency from south to north,which was consistent with the quasi-synchronous measured data,and actually reflect the eutrophication sit-uation of Keqin Lake.Which caused by there are much cultivated land around north lake,and much reed which can purify the water nearby south lake.The model could accurately estimate chlorophyll-a concentration of Keqin Lake,and could satisfy the requirement for quantitative monitoring of chlorophyll-a concentration.This researching will provid theoretical basis to dynamics monitoring and early warning of water quality.

关 键 词：叶绿素A 遥感技术 克钦湖 TM数据 

分 类 号：X524[环境科学与工程—环境工程]