气候变化领域集成服务门户(CCPortal): Geophysical and Remote Sensing Assessment of Chad's Groundwater Resources

CCPortal

DOI	10.3390/rs15030560
	Geophysical and Remote Sensing Assessment of Chad's Groundwater Resources
	Mohamed, Ahmed; Abdelrady, Ahmed; Alarifi, Saad S.; Othman, Abdullah
发表日期	2023
EISSN	2072-4292
卷号	15 期号:3
英文摘要	Because of climate change and human activity, North and Central Africa are experiencing a significant water shortage. Recent advancements in earth observation technologies have made widespread groundwater monitoring possible. To examine spatial and temporal mass fluctuations caused by groundwater variations in Chad, gravity solutions from the Gravity Recovery and Climate Experiment (GRACE), climatic model outputs, and precipitation data are integrated. The results are as follows: (1) The investigated region experienced average annual precipitation (AAP) rates of 351.6, 336.22, and 377.8 mm yr(-1), throughout the overall investigation period (04/2002-12/2021), Period I (04/2002-12/2011), and Period II (01/2012-12/2021), respectively. (2) Using the three gravity solutions, the average Terrestrial Water Storage Variations (Delta TWS) values are estimated to be +0.26 +/- 0.04, +0.006 +/- 0.10, and +0.64 +/- 0.12 cm yr(-1), for the overall study period, periods I, and II, respectively. (3) Throughout the full period, periods I, and II, the groundwater storage fluctuations (Delta GWS) are calculated to be +0.25 +/- 0.04, +0.0001 +/- 0.099, and +0.62 +/- 0.12 cm yr(-1), respectively after removing the soil moisture (Delta SMS) and Lake Chad water level trend values. (4) The country receives an average natural recharge rate of +0.32 +/- 0.04, +0.068 +/- 0.099, and +0.69 +/- 0.12 cm yr(-1), throughout the whole period, Periods I, and II, respectively. (5) The southern mountainous regions of Erdi, Ennedi, Tibesti, and Darfur are receiving higher rainfall rates that may recharge the northern part of Chad through the stream networks; in addition to the Lake Chad and the higher rainfall over southern Chad might help recharge the central and southern parts of the country. (6) A preferred groundwater flow path from the Kufra (Chad and Libya) to the Dakhla basin (Egypt) appears to be the Pelusium mega shear system, which trends north-east. The findings suggest that GRACE is useful for monitoring changes in groundwater storage and recharge rates across large areas. Our observation-based methodology provides a unique understanding of monthly ground-water patterns at the state level, which is essential for successful interstate resource allocation, future development, and policy initiatives, as well as having broad scientific implications for arid and semiarid countries.
英文关键词	geophysics; time-variable gravity data; terrestrial water storage; groundwater resources; recharge; Chad
语种	英语
WOS研究方向	Environmental Sciences ; Geosciences, Multidisciplinary ; Remote Sensing ; Imaging Science & Photographic Technology
WOS类目	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000930124600001
来源期刊	REMOTE SENSING
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/281397
作者单位	Egyptian Knowledge Bank (EKB); Assiut University; Delft University of Technology; King Saud University; Umm Al Qura University
推荐引用方式 GB/T 7714	Mohamed, Ahmed,Abdelrady, Ahmed,Alarifi, Saad S.,et al. Geophysical and Remote Sensing Assessment of Chad's Groundwater Resources[J],2023,15(3).
APA	Mohamed, Ahmed,Abdelrady, Ahmed,Alarifi, Saad S.,&Othman, Abdullah.(2023).Geophysical and Remote Sensing Assessment of Chad's Groundwater Resources.REMOTE SENSING,15(3).
MLA	Mohamed, Ahmed,et al."Geophysical and Remote Sensing Assessment of Chad's Groundwater Resources".REMOTE SENSING 15.3(2023).