globalchange  > 气候变化事实与影响
DOI: 10.1016/j.scitotenv.2018.12.051
WOS记录号: WOS:000456175700022
论文题名:
Physical dynamics of Lake Victoria over the past 34 years (1984-2018): Is the lake dying?
作者: Awange, J. L.1; Saleem, A.1; Sukhadiya, R. M.1; Ouma, Y. O.2; Kexiang, H.1
通讯作者: Saleem, A.
刊名: SCIENCE OF THE TOTAL ENVIRONMENT
ISSN: 0048-9697
EISSN: 1879-1026
出版年: 2019
卷: 658, 页码:199-218
语种: 英语
英文关键词: Lake Victoria ; Physical parameters ; Spatio-temporal changes ; Climate change ; Anthropogenic activities
WOS关键词: EAST-AFRICAN RAINFALL ; TERRESTRIAL WATER STORAGE ; SEA-SURFACE TEMPERATURE ; PRINCIPAL COMPONENT ; CLIMATE-CHANGE ; POTENTIAL IMPACTS ; NILE BASIN ; PRECIPITATION ; LANDSAT ; ACCURACY
WOS学科分类: Environmental Sciences
WOS研究方向: Environmental Sciences & Ecology
英文摘要:

Understanding changes in the physical dynamics of lakes (e.g., areas and shorelines) is important to inform policies, planning and management during climate extremes (e.g., floods and droughts). For Lake Victoria, the world's second largest freshwater lake, its physical dynamics and associated changes are not well understood as evidenced, e.g., from the citations of its area 66,400-69,485 km(2), length 300-412 km, width 240-355 km, and shorelines 3300-4828 km. Its sheer size and lack of research resources commitment by regional governments hamper observations. This contribution employs a suite of remotely sensed products for the past 34 years (1984-2018); Landsat, Sentinel-2, MODIS, Google Earth Pro, CHIRPS, Multivariate El' Nino-Southern Oscillation Index and altimetry data together with the physical parameters from 37 publications (1969-2018) to (i) study the lake's dynamics and establish its current (2018) state, (ii) identify and analyse hotspots where significantly dynamic changes occur, and (iii), study the contributions of climate change and anthropogenic activities on these dynamics. Utilizing manual digitisation, MNDWI, NDVI and PCA methods, the study shows the lake's mean surface area to be 69,295 km2 (i.e., 812 km(2) or 1.2% more than that of the 37 publications) and its 2018 value to be 69,216 km2 (i.e., similar to 733 km(2) (1.1%) more than that of the 37 publications). As to whether the lake is dying, it shrunk by 203 km(2) (0.3%) compared to its 1984 value, a decrease noted mainly in four hotspot Gulfs (Birinzi 40%, Winam 20%, Emin Pasha 38% and Mwanza 55%). Correspondingly, the expansion of Nalubaale Dam (2002-2006) decreased the areas by 31%, 10%, 21% and 44%, respectively. Seasonal analysis shows an increase of 9 km(2) in the lake's area during the heavy rainy season (March-May) while the ENSO enlarged the area by 0.23% (2007) and 0.45% (2010). It is evident, therefore, that both climate variability/change and anthropogenic activities are exerting a toll on the tropical's largest freshwater body thereby necessitating careful exploitation and management plans. (C) 2018 Elsevier B.V. All rights reserved.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/132381
Appears in Collections:气候变化事实与影响

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作者单位: 1.Curtin Univ, Sch Earth & Planetary Sci, Spatial Sci Discipline, Perth, WA, Australia
2.Moi Univ, Sch Engn, Eldoret, Uasin Gishu Cou, Kenya

Recommended Citation:
Awange, J. L.,Saleem, A.,Sukhadiya, R. M.,et al. Physical dynamics of Lake Victoria over the past 34 years (1984-2018): Is the lake dying?[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019-01-01,658:199-218
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