Groundwater resources assessment in the Densu Basin: A review

Akurugu, Bismark Awinbire; Obuobie, Emmanuel; Yidana, Sandow Mark; Stisen, Simon; Seidenfaden, Ida Karlsson; Chegbeleh, Larry Pax

doi:10.1016/j.ejrh.2022.101017

Cited by 5 publications

(6 citation statements)

References 19 publications

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“…Therefore, changes in groundwater levels were influenced by recharge only, which showed a decreasing trend attributed to the increase in urbanization as built-up areas increased despite the projected increase in rainfall due to the effect of climate change. This research findings agreed well with the findings of Duy et al and Akurugun et al [8,41], which shows recharge decrease with increase in urbanization and vice versa.…”

Section: Figure 16 Groundwater Levels Contour With An Increase In Abs...supporting

confidence: 92%

Effect of Recharge and Abstraction on Groundwater Levels

2022

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Groundwater constitutes 99% of all liquid freshwater globally that is available for human use. Groundwater levels in the Nairobi aquifer system (NAS) have been declining over time because of excessive abstraction fueled by increased water demand. This has increased the cost of pumping and drilling boreholes, which is unsustainable. The objective of this study is to determine the effect of recharge and abstraction on groundwater levels using a more realistic approach by estimating recharge using the SWAT model while considering climatic data, soil type, land use/cover, and topography. Recharge obtained from SWAT was applied in MODFLOW to model the groundwater system. Results showed that the average annual recharge was 73 mm, which is about 9.7% of the precipitation. Groundwater levels decreased with an increase in abstraction and a decrease in recharge and vice versa. Groundwater levels will decrease by 76 m by the year 2063 if the abstraction rate is kept constant and the recharge is maintained, and will decrease by 14m by the year 2030 if the trend of abstraction rate continues to increase while recharge is kept constant. The abstraction rate should be regulated according to available recharge and recharge enhanced to avoid possible depletion of groundwater. Doi: 10.28991/CEJ-2022-08-05-05 Full Text: PDF

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Section: Figure 16 Groundwater Levels Contour With An Increase In Abs...supporting

confidence: 92%

Effect of Recharge and Abstraction on Groundwater Levels

2022

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“…Dovie and Kasei [75] also employed the SPI to highlight the increased drought and flood influence on groundwater recharge and irrigation in the White Volta river basin. In addition, Akurugu et al [76] studied the groundwater resources in the Densu river basin in south-western coastal Ghana, and they concluded that the basin's recharge rate is at risk of decreasing due to the impacts of climate change and urbanization. Furthermore, Nasirudeen et al [77] used the SPI and Reconnaissance Drought Index (RDI) to analyze drought patterns in the Tano river basin and found that drought had a negative impact on agricultural production and water supply along the river.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Characteristics of Meteorological Drought and Wetness Events across the Coastal Savannah Agroecological Zone of Ghana

Ankrah

Monteiro

Madureira

2023

Water

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Drought and wetness events have become common due to global warming, warranting the need for continuous analysis and monitoring of drought and wet events to safeguard people’s livelihoods. In this study, the Standardized Precipitation Evapotranspiration Index (SPEI) was utilized to analyze the spatiotemporal characteristics of drought and wetness events in the coastal Savannah agroecological zone from 1981 to 2021. Climate data from 14 locations across the zone were used to characterize drought and wetness events at the 3 and 12 month timescales. Except for September 1995 and November 2002, when changepoints occurred, the results revealed the homogeneous nature of temperature and rainfall in the zone. More drought events were observed in the dry and minor seasons, while the wet season had more wetness events under both the SPEI-3 and SPEI-12 timescales. The results also showed that, while moderate-to-severe drought events were common for most years, extreme drought events were more typical in the 1980s and 1990s than in the 2000s under both the SPEI-3 and SPEI-12. Furthermore, the 2000s saw more moderate-to-severe wetness events than the 1980s and 1990s, while the greatest number of extreme wetness events occurred in 1987, followed by 1997 and 2021 under the SPEI-3, and a few moderate-to-extreme wetness events occurred in 1987, 1991, 1997–1998, 2012–2013, 2018, and 2020–2021 under the SPEI-12. Under the SPEI-12, only extreme drought events showed a significant positive trend with a small magnitude of change. On the spatial scale, drought and wetness events occurred more frequently in the Central and Volta regions than in the Greater Accra region; however, the intensity and duration of the events were stronger and lasted longer in the Greater Accra and Central regions than in the Volta region. The regular monitoring of drought and wetness events is required to protect the livelihoods of people in the zone.

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“…It is worth noting that the DRB is responsible for the supply of 300,000 m 3 of water on a daily basis to most parts of Accra through the Weija Dam. For some years now, the river has served as the primary water source to most smaller communities around the basin (Arthur, 2023;Akurugu et al, 2022;Wantzen, 2023). Ghana water company also uses the Weija Dam which is on the river as a water treatment plant to supply water to the general populace in Accra (Asante et al, 2017;Ofosu et al, 2020).…”

Section: Environmental Implicationsmentioning

confidence: 99%

“…The encroachment of the basin is however a serious threat to the quality and even the availability of water within the basin as human activities around the basin will greatly affect it. Also, as a result of the encroachments, the basin has become extremely liable to drought as studies by Akurugu et al (2022) indicate that 12% of the basin is liable to drought within the next 10 years.…”

Section: Environmental Implicationsmentioning

confidence: 99%

Land use-land cover changes and river basin degradation: A case study of the Densu River in Ghana

Lord,

Seth,

Kwaku

2024

J. Geogr. Reg. Plann.

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Land use-land cover (LULC) changes over time trigger local climatic and geological changes. Recent earth tremors around the Densu River Basin (DRB) in Weija near Accra Ghana, provided the motivation for this study. Using Landsat 8 and Landsat 9 OLI/TIRS imageries, this paper maps the various LULC change trends in the basin over 20 years (2003-2023) and discusses the impact on the Densu River basin. Land cover changes identified include shrinking water bodies, farmlands, and closed forests. These changes were linked to human encroachment through both direct and indirect means. The paper concludes with a discussion of policy implications and lessons for land use planning and river basin management.

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Groundwater resources assessment in the Densu Basin: A review

Cited by 5 publications

References 19 publications

Effect of Recharge and Abstraction on Groundwater Levels

Effect of Recharge and Abstraction on Groundwater Levels

Spatiotemporal Characteristics of Meteorological Drought and Wetness Events across the Coastal Savannah Agroecological Zone of Ghana

Land use-land cover changes and river basin degradation: A case study of the Densu River in Ghana

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