Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR027746 |
Investigating the productivity and sustainability of weathered basement aquifers in tropical Africa using numerical simulation and global sensitivity analysis | |
Marco Bianchi; Alan M. MacDonald; David M. J. Macdonald; Enoch B. Asare | |
2020-09-09 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | Groundwater stored in weathered basement aquifers (WBAs) is a strategic water resource. In this study, we investigate the productivity of WBAs and sustainability of groundwater abstractions using a novel process‐based stochastic modelling approach, which is applied to simulate abstractions in the Precambrian basement aquifer in Ghana. The statistical distribution of the generated synthetic yield data was found in very good agreement with observed yield data from the same Ghanaian aquifer. Further analysis provided robust insights regarding how different hydrogeological parameters of the WBA, and their interplay, control aquifer productivity and sustainability. Results indicate that 97% of the simulated abstractions could sustain the yield of a handpump (6 L/min), approximately 30% could also sustain yields > 60 L/min, while only 1% could sustain yields greater than 300 L/min. The model indicates that an aquifer transmissivity value of approximately 1.4 m2/d is required for a successful hand‐pumped borehole, while a higher yielding source (60 L/min) requires a transmissivity value of at least 9.5 m2/d. A global sensitivity analysis of 13 model input parameters shows that the thickness of the regolith and the maximum hydraulic conductivity developed at the base of the saprolite are the critical factors controlling success and sustainability for low yielding hand‐pumped boreholes. For higher yielding supplies, the net recharge, the depth to groundwater, and the aquifer extent become increasingly significant. Results from this work have important implications for the potential for increased development of groundwater from weathered basement aquifers in tropical Africa. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/293989 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Marco Bianchi,Alan M. MacDonald,David M. J. Macdonald,et al. Investigating the productivity and sustainability of weathered basement aquifers in tropical Africa using numerical simulation and global sensitivity analysis[J]. Water Resources Research,2020. |
APA | Marco Bianchi,Alan M. MacDonald,David M. J. Macdonald,&Enoch B. Asare.(2020).Investigating the productivity and sustainability of weathered basement aquifers in tropical Africa using numerical simulation and global sensitivity analysis.Water Resources Research. |
MLA | Marco Bianchi,et al."Investigating the productivity and sustainability of weathered basement aquifers in tropical Africa using numerical simulation and global sensitivity analysis".Water Resources Research (2020). |
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