摘要
鄱阳湖是中国最大的淡水湖,是世界上重要的湿地,近年来旱涝灾害频发,引起了广泛关注。鉴于其高频波动的特征,有必要使用长期的高时间分辨率卫星对其进行监测。从2001-2020年MODIS数据中提取鄱阳湖水域面积分析其变化特征,并利用Mann-Kendall突变检验和小波分析法研究鄱阳湖水域面积对气象因素的响应情况。结果表明:①鄱阳湖季节性变化显著,2003年后枯水期持续时间有一定程度延长,研究期内最小水域和最大水域的年际变化趋势呈弱相反;②水域面积在2004年发生突变后呈下降,面积时间序列在主周期18个月(约1.5 a)上变化具有全域性,正负交替规律较强;③鄱阳湖水域面积变化对气象因素存在响应,不同水情下气象作用有差异,降雨量是影响水域面积的主导因素。
Poyang Lake is the largest freshwater lake in China and an important wetland in the world.In recent years,drought and flood have occurred frequently,which has attracted extensive attention.Due to its high-frequency fluctuation characteristics,it is necessary to monitor it with long-term high temporal resolution satellites.The variation characteristics of Poyang Lake water area are analyzed by extracting MODIS data from 2001 to 2020,and the response of Poyang Lake water area to meteorological factors is studied by using Mann-Kendall Mutation Test and wavelet analysis.The results show that:①The seasonal variation of Poyang Lake is significant,and the duration of dry season extended to a certain extent after 2003.The interannual variation trend of the smallest and largest water areas in the study period was weakly opposite.②The water area decreased after mutation in 2004,and the time series of water area changed regionally over the main period of 18 months(about 1.5 a),with strong positive and negative alternating law.③The variation of water area in Poyang Lake responds to meteorological factors,and the meteorological effects are different under different water regimes.Rainfall is the dominant factor affecting water areas.
作者
谢诗怡
况润元
宋子豪
XIE Shi-yi;KUANG Run-yuan;SONG Zi-hao(School of Civil and Mapping,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi Province,China;LTD of China Coal Zhejiang Surveying and Mapping Geographic Information,Hangzhou 310000,China)
出处
《中国农村水利水电》
北大核心
2022年第7期103-109,共7页
China Rural Water and Hydropower
基金
江西省教育厅科学技术研究项目(GJJ160617)。
