基于Google Earth Engine 的鄱阳湖面积时空变化及驱动因素分析
Analysis of Spatiotemporal Changes and Driving Factors of Poyang Lake Area Based on Google Earth Engine
投稿时间:2021-01-03  修订日期:2021-01-03
DOI:
中文关键词:  鄱阳湖  Google Earth Engine  水体指数  时空变化
英文关键词:Poyang Lake  Google Earth Engine  water index  Temporal and spatial changes
基金项目:自然资源部地理国情监测重点实验室开放基金资助(2020NGCM07)
作者单位邮编
姬梦飞 长江大学地球科学学院 430100
汤军 长江大学地球科学学院 430100
高贤君 长江大学地球科学学院 
杨元维 长江大学地球科学学院 
吴贞江 长江大学地球科学学院 
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中文摘要:
      长时间序列的湖泊动态监测对湖泊资源合理利用及生态环境保护有重要意义。作为中国最大的淡水湖,鄱阳湖面积变化受到广泛关注。研究基于Google Earth Engine云平台,以1989—2019年覆盖鄱阳湖的Landsat影像为数据源,在归一化差分水体指数(NDWI)、改进归一化差分水体指数(MNDWI)和自动水提取指数(AWEI)中选用最适水体指数提取鄱阳湖水体,分析鄱阳湖时间及空间变化特征,研究鄱阳湖面积变化与降水、气温、蒸发量和土地利用的关系。研究表明:(1)1989—2019年,鄱阳湖面积呈现下降趋势,西部和西南部是鄱阳湖主要缩减区,湖泊面积变化季节性明显,夏季湖泊面积较大,冬季湖泊水面缩减分散。(2)降水和气温是影响夏季湖泊面积变化的重要因素(R2为0.511和-0.487),蒸发量是2003—2009年冬季湖泊面积变化的重要因素(R2=-0.801)。(3)随着经济发展和人口增加,城市和耕地侵占湖泊,使湖泊大量减少。
英文摘要:
      Long—term lake dynamic monitoring is of great significance to the rational utilization of lake resources and ecological environment protection. As the largest freshwater lake in China, the area change of Poyang Lake has received widespread attention. The research is based on the Google Earth Engine cloud platform, using the Landsat imagery covering Poyang Lake from 1989 to 2019 as the data source. The normalized differential water index (NDWI), improved normalized differential water index (MNDWI) and automatic water extraction index (AWEI) were selected as the most suitable water index to extract the water of Poyang Lake, analyze the characteristics of time and space changes of Poyang Lake. The relationship between the change of Poyang Lake area and precipitation, temperature, evaporation and land use were studied. The results are as follows:(1) From 1989 to 2019, the area of Poyang Lake showed a downward trend. The western and southwestern parts of Poyang Lake were the main shrinking areas. The area of the lake changed seasonally. The lake area is larger in summer, and the lake surface is reduced and scattered in winter. (2) Precipitation and temperature are important factors affecting the lake area change in summer (R2 is 0.511 and -0.487), and evaporation is an important factor in the lake area change in winter from 2003 to 2009 (R2=-0.801). (3) As the economic development and population increasing, cities and cultivated land invade lakes, causing lakes to decrease greatly.
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