KMS Institute Of Geographic Sciences And Natural Resources Research,CAS
| Assessment of hydro-climatic trends and causes of dramatically declining stream flow to Lake Chad, Africa, using a hydrological approach | |
Mahmood, Rashid1; Jia, Shaofeng1,2,3
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| 2019-07-20 | |
| Source Publication | SCIENCE OF THE TOTAL ENVIRONMENT
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| ISSN | 0048-9697 |
| Volume | 675Pages:122-140 |
| Corresponding Author | Mahmood, Rashid(rashi1254@gmail.com) ; Jia, Shaofeng(jiasf@igsnrr.ac.cn) |
| Abstract | In the 1960s, Lake Chad (LC) was one of the largest inland water body on the earth and since then, it has extremely shrunk from a surface area of 25,000 km(2) to 2000 km(2). The present study determines hydro-climatic changes in the active parts of the Lake Chad basin by using trend analysis and the causes of declining stream flow to LC due to human interventions and climate variability by using a hydrological approach. One approach, which is used to estimate changes in stream flow due to climate variability, is also modified in this study. Trend results showed that mean temperature exhibited very strong increasing trends, with amean rise of 1.4 degrees C for 1951-2015, while precipitation presented very weak to strong declining trends, with an overall decline of 15%. Regarding stream flow, all major rivers showed very strong downward trends, resulting in 67% decline. The northern and eastern regions were the most impacted areas in the basin regarding decreasing precipitation and increasing temperature. The hydrological approach showed that decreasing stream flow to LC varied between 34% and 45% in different decades. In general, human activities attributed a 66% decline in stream flow and climate variability 34% for the impacted period (1972-2013) relative to 1951-1971. Only during 1982-1991, climate variability caused most reduction (59% of total) in stream flow because of devastating drought during this period. Since stream flow to LC was mostly affected by human activities, proper water resources planning and sustainable management are necessary but under the umbrella of considering changing climate. (C) 2019 Elsevier B.V. All rights reserved. |
| Keyword | Trend analysis Climate variability Hydrological modelling HEC-HMS Human activities Lake Chad basin |
| DOI | 10.1016/j.scitotenv.2019.04.219 |
| WOS Keyword | SURFACE-WATER RESOURCES ; HEC-HMS MODEL ; RIVER-BASIN ; QUANTITATIVE ASSESSMENT ; GRIDDED DATASETS ; QUALITY-CONTROL ; WEST-AFRICA ; VARIABILITY ; PRECIPITATION ; RAINFALL |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA20010201] ; Power China International Limited |
| Funding Organization | Strategic Priority Research Program of the Chinese Academy of Sciences ; Power China International Limited |
| WOS Research Area | Environmental Sciences & Ecology |
| WOS Subject | Environmental Sciences |
| WOS ID | WOS:000467391900012 |
| Publisher | ELSEVIER SCIENCE BV |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.igsnrr.ac.cn/handle/311030/59832 |
| Collection | 中国科学院地理科学与资源研究所 |
| Corresponding Author | Mahmood, Rashid; Jia, Shaofeng |
| Affiliation | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Qinghai Inst Water Resources & Hydropower, Qinghai Key Lab Basin Water Cycle & Ecol, Xining, Qinghai, Peoples R China 3.Qinghai Normal Univ, Sch Geog Sci, Xining, Qinghai, Peoples R China |
| Recommended Citation GB/T 7714 | Mahmood, Rashid,Jia, Shaofeng. Assessment of hydro-climatic trends and causes of dramatically declining stream flow to Lake Chad, Africa, using a hydrological approach[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,675:122-140. |
| APA | Mahmood, Rashid,&Jia, Shaofeng.(2019).Assessment of hydro-climatic trends and causes of dramatically declining stream flow to Lake Chad, Africa, using a hydrological approach.SCIENCE OF THE TOTAL ENVIRONMENT,675,122-140. |
| MLA | Mahmood, Rashid,et al."Assessment of hydro-climatic trends and causes of dramatically declining stream flow to Lake Chad, Africa, using a hydrological approach".SCIENCE OF THE TOTAL ENVIRONMENT 675(2019):122-140. |
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