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基于多源卫星数据的淀山湖富营养化时空分布研究
投稿时间:2022-12-01  修订日期:2022-12-19  点此下载全文
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作者单位地址
刘君 上海市水文总站 上海市龙华西路241号
戚浩强 上海市水文总站 
黄奔 上海市水文总站 
董蕾 中国科学院上海技术物理研究所 上海市虹口区玉田路500号中国科学院上海技术物理研究所
基金项目:上海市水务局科研项目(沪水科2021-10)
中文摘要:准确监测蓝藻水华是湖泊富营养化研究的基础,可以为水环境部门的管理、决策提供依据。论文以淀山湖为研究对象,利用sentinel-2 MSI、Landsat 8 OLI两种影像数据,通过改进的浮游藻类指数(Floating Algae Index, FAI)监测了2019年~2021年共21景淀山湖区域的水华情况,在此基础上分析了淀山湖富营养化的分布规律。结果表明:(1)淀山湖连续三年都有蓝藻水华出现,存在富营养化情况;(2)每年的6~9月份是蓝藻水华的高发期,湖体富营养化发生的面积较大、频率较高,2020年9月和2021年8月爆发水华面积超过20km2;(3)水华爆发速度较快,持续时间较短。
中文关键词:淀山湖  蓝藻水华 富营养化  sentinel-2  Landsat 8  时空分布
 
Study on the spatiotemporal distribution of eutrophication in Dianshan Lake based on multi-source satellite data
Abstract:Accurate monitoring of cyanobacterial blooms is the basis of lake eutrophication research, it can provide a basis for management and decision-making in water environment departments. In this paper, Dianshan Lake was chosen as this search object, sentinel-2 MSI and Landsat 8 OLI image data was used to monitor a total of 21 algal bloom areas in Dianshan Lake from 2019 to 2021 through the improved Floating Algae Index (FAI). On this basis, the distribution law of eutrophication in Dianshan Lake was analyzed. The results show that: (1) Cyanobacterial blooms have appeared in Dianshan Lake for three consecutive years, and there is eutrophication; (2) The high incidence period of eutrophication in this lake is from June to September each year, and the area and frequency of algal blooms are large and higher. Among them, the area of algal blooms in September 2020 and August 2021 exceeded 20 km2; (3) the algal blooms broke out faster and lasted for a shorter period of time.
keywords:Dianshan lake  cyanobacterial blooms  eutrophication  sentinel-2  Landsat 8  spatial-temporal distribution
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