基于Landsat 8影像的后官湖叶绿素a浓度反演研究  

Research on Retrieval of Chlorophyll a Concentration in Houguan Lake Based on Landsat 8 Images

作　　者：刘威[1] 蔡永香[1] 甘艺垚 王倩 黄爽 王雨轩 LIU Wei;CAI Yong-xiang;GAN Yi-yan;WANG Qian;HUANG Shuang;WANG Yu-xuan(College of Geoscience,Yangtze University,Wuhan 430100,China)

机构地区：[1]长江大学地球科学学院,湖北武汉430100

出　　处：《内蒙古师范大学学报（自然科学版）》2022年第2期178-185,共8页Journal of Inner Mongolia Normal University(Natural Science Edition)

基　　金：国家自然科学基金青年基金资助项目(41701537);地理信息工程国家重点实验室开放基金资助项目(SKLGIE2017-M-4-6)。

摘　　要：采用2015—2020年的Landsat系列影像,结合实测数据构建叶绿素a浓度反演模型,分析了武汉蔡甸后官湖近6年叶绿素a浓度的时空分布特征。研究结果表明:在空间分布特征上,湖心水域浓度主要集中在5~7μg/L范围内,湖岸水域浓度主要集中于35~50μg/L范围内,呈现自西向东逐渐增加,湖心低于湖岸的趋势;在时间分布特征上,从2015年开始水质逐渐恶化,2018年浓度达到异常高值64.872μg/L,部分水域处于重度富营养化状况,但从2019年水体富营养化程度开始回落,水质在逐渐好转,且在不同季节中,水质表现春季、冬季优于夏季、秋季。A chlorophyll a concentration inversion model was constructed by using Landsat series of images from 2015 to 2020,combined with measured data at the research area in Houguan Lake in Caidian,Wuhan to analyze the temporal and spatial distribution characteristics of chlorophyll a concentration of the region in the past 6 years in the paper. The results in terms of spatial distribution characteristics showed that the chlorophyll a concentration in the lake center waters was mainly concentrated in the range of 5~7 μg/L,and that in the lakeshore waters was mainly concentrated in the range of 35~50 μg/L,taking a gradual increase from west to east,and a trend that the concentration in lake center was lower than that in the lakeshore. In terms of temporal distribution characteristics,the water quality gradually deteriorated from 2015 and it reached an abnormal high concentration of 64. 872 μg/L in 2018,some waters were in a state of severe eutrophication.Since 2019,the eutrophication level of the water body began to decrease;the water quality was gradually improving,and showed that in spring and winter were better than that in summer and autumn for different seasons.

关 键 词：后官湖 Landsat8影像 叶绿素A 遥感反演 

分 类 号：P23[天文地球—摄影测量与遥感]