基于Google Earth Engine平台的1984—2018年太湖水域变化特征  

Surface water change characteristics of Taihu Lake from 1984-2018 based on Google Earth Engine

作　　者：刘垚燚 田恬 曾鹏[1,2] 张新雨 车越 LIU Yao-yi;TIAN Tian;ZENG Peng;ZHANG Xin-yu;CHE Yue(School of Ecological and Environmental Sciences,East China Normal University,Shanghai 200241,Chi-na;Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration,Shanghai 200241,China)

机构地区：[1]华东师范大学生态与环境科学学院,上海200241 [2]上海市城市化生态过程与生态恢复重点实验室,上海200241

出　　处：《应用生态学报》2020年第9期3163-3172,共10页Chinese Journal of Applied Ecology

基　　金：上海市水务局科研项目(2020-19)资助。

摘　　要：湖泊是重要的淡水资源,准确了解湖泊水体动态变化有利于水资源可持续利用和社会经济发展。本研究基于Google Earth Engine(GEE)平台,以Joint Research Centre(JRC)全球地表水数据集和Landsat遥感影像为数据源,分析了1984—2018年大型湖泊——太湖水体的动态变化,并利用改进的归一化差异水体指数(MNDWI)研究了太湖面积变化趋势。结果表明:1984—2018年,太湖湖泊面积呈增加趋势,共增加45.31 km^2,湖泊面积呈夏季低、春冬季高的特点,东太湖是太湖面积发生变化的主要区域。与1984年相比,2018年太湖88.9%的水体未发生任何变化,0.3%的水体永久性消失。湖泊面积变化受自然和人为因素的共同影响,农业灌溉、渔业养殖、围湖垦殖、水利工程设施和土地利用类型转移等导致湖泊面积减少;年降水量增加和环境保护政策的实施是湖泊面积增加的主要原因。本研究结果可为实施水资源可持续管理提供参考,亦验证了基于GEE平台开展水体长期变化监测的可行性。Lakes are important fresh water resources.Accurate understanding of lake dynamic changes benefits the sustainable development of water resources and socio-economic development.Based on the Google Earth Engine(GEE),we analyzed the dynamics of Taihu Lake from 1984 to 2018 by adopting the dataset of Joint Research Centre’s Global Surface Water and Landsat imagery.The modified normalized difference water index(MNDWI)was used to explore the changes in the area of Taihu Lake in recent 35 years.The results showed that the area of Taihu Lake increased during 1984-2018,with a total increase of 45.31 km^2.The area in spring and winter was larger than that in summer.Eastern Taihu Lake was the main part of Taihu Lake showing area change.Compared with 1984,88.9%of the water area of Taihu Lake in 2018 did not change,and 0.3%of the water area disappeared permanently.Lake area changes were affected by both natural and anthropogenic factors.Agricultural irrigation,fish farming,reclamation of surrounding lakes,water conservancy engineering facilities,and the transformation of land-use types caused the reduction in lake area.Increased annual precipitation and the implementation of environmental protection policies were the main factors for the increases in lake area.The results provide reference for effective sustainable water resource management and verify the feasibility of monitoring long-term surface water change based on the GEE platform.

关 键 词：水体动态变化 太湖 Google Earth Engine 改进的归一化差异水体指数 长时间序列 

分 类 号：P343.3[天文地球—水文科学] TV211[天文地球—地球物理学]