Monitoring Recent Fluctuations of the Southern Pool of Lake Chad Using Multiple Remote Sensing Data: Implications for Water Balance Analysis

doi:10.3390/rs9101032

	Monitoring Recent Fluctuations of the Southern Pool of Lake Chad Using Multiple Remote Sensing Data: Implications for Water Balance Analysis
	Zhu, Wenbin 1,2; Yan, Jiabao 1,2; Jia, Shaofeng 1,2
刊名	REMOTE SENSING
	2017-10-01
卷号	9 期号:10 页码:26
关键词	water level water surface area water volume variations water balance remote sensing Lake Chad
ISSN号	2072-4292
DOI	10.3390/rs9101032
通讯作者	Jia, Shaofeng(jiasf@igsnrr.ac.cn)
英文摘要	The drought episodes in the second half of the 20th century have profoundly modified the state of Lake Chad and investigation of its variations is necessary under the new circumstances. Multiple remote sensing observations were used in this paper to study its variation in the recent 25 years. Unlike previous studies, only the southern pool of Lake Chad (SPLC) was selected as our study area, because it is the only permanent open water area after the serious lake recession in 1973-1975. Four satellite altimetry products were used for water level retrieval and 904 Landsat TM/ETM+ images were used for lake surface area extraction. Based on the water level (L) and surface area (A) retrieved (with coinciding dates), linear regression method was used to retrieve the SPLC's L-A curve, which was then integrated to estimate water volume variations (DV). The results show that the SPLC has been in a relatively stable phase, with a slight increasing trend from 1992 to 2016. On annual average scale, the increase rate of water level, surface area and water volume is 0.5 cm year(-1), 0.14 km(2) year(-1) and 0.007 km(3) year(-1), respectively. As for the intra-annual variations of the SPLC, the seasonal variation amplitude of water level, lake area and water volume is 1.38 m, 38.08 km(2) and 2.00 km(3), respectively. The scatterplots between precipitation and D V indicate that there is a time lag of about one to two months in the response of water volume variations to precipitation, which makes it possible for us to predict D V. The water balance of the SPLC is significantly different from that of the entire Lake Chad. While evaporation accounts for 96% of the lake's total water losses, only 16% of the SPLC's losses are consumed by evaporation, with the other 84% offset by outflow.
资助项目	National Key Research and Development Program of China[2016YFC0401307] ; PowerChina International Limited
WOS关键词	SATELLITE ALTIMETRY ; VOLUME VARIATIONS ; TIME-SERIES ; BASIN ; LANDSAT ; DYNAMICS ; IMAGERY ; AFRICA ; REGION ; GRACE
WOS研究方向	Remote Sensing
语种	英语
出版者	MDPI AG
WOS记录号	WOS:000414650600062
资助机构	National Key Research and Development Program of China ; PowerChina International Limited
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/61096]
专题	中国科学院地理科学与资源研究所
通讯作者	Jia, Shaofeng
作者单位	1.Chinese Acad Sci, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Wenbin,Yan, Jiabao,Jia, Shaofeng. Monitoring Recent Fluctuations of the Southern Pool of Lake Chad Using Multiple Remote Sensing Data: Implications for Water Balance Analysis[J]. REMOTE SENSING,2017,9(10):26.
APA	Zhu, Wenbin,Yan, Jiabao,&Jia, Shaofeng.(2017).Monitoring Recent Fluctuations of the Southern Pool of Lake Chad Using Multiple Remote Sensing Data: Implications for Water Balance Analysis.REMOTE SENSING,9(10),26.
MLA	Zhu, Wenbin,et al."Monitoring Recent Fluctuations of the Southern Pool of Lake Chad Using Multiple Remote Sensing Data: Implications for Water Balance Analysis".REMOTE SENSING 9.10(2017):26.