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Modeling the impact of land cover changes on water balance in the Vea catchment of Ghana, 1985–2040

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Abstract

The ensuing effect of global land use changes on watershed hydrology is enormous, particularly in rapidly developing countries such as Ghana. Understanding how watershed land use dynamics influence hydrology is essential to devising effective land and water resources management strategies. This study evaluated the impact of land-use changes on hydrological components in the Vea catchment of Ghana from 1986 to 2040 using the Cellular Automata (CA)-Markov chain model for land change modeling and Soil Water Assessment Tool (SWAT) for hydrological modeling. The models performed satisfactorily with NSE values of 0.74 and 0.78 for calibration and validation, respectively, in SWAT and an overall Kappa value of 0.89 in CA-Markov. The land cover change analysis revealed a continuous increase in farmland and built-up areas alongside decreasing savanah forest which resulted in increased Curved Numbers (CN) from 81 in 1986 to 86 in 2040. Consequently, ET and baseflow decreased by − 7.8% and − 26.2%, respectively, while surface runoff, and water yield increased by 46.9%, and 5.1%, respectively. Despite the general decline in baseflow, the seasonal trend showed an extention to January, indicating adequate storage of water in the shallow aquifer that can be extracted for dry season gardening. While vegetation restoration is critical to reducing eroded sediment yield to guarantee reservoir storage, constructing dams and dugouts to harness the high surface runoff for irrigation and livestock watering in the long dry season is also needful.

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Data availability statement

The data that support the findings of this study are available from the corresponding author (JAA), upon reasonable request.

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Acknowledgements

The authors duly acknowledge the funding support from the Regional Water and Environmental Sanitation Center, Kumasi (RWESCK), an African Center of Excellence under the auspices of the World Bank and Government of Ghana. Irrigation Company of the upper region (ICOUR) is much appreciated for the Data support.

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Conceptualization and data collection were done by JAA. Data preprocessing were done by JAA and AJ. JAA also contributed to literature review and modeling while writing the first draft and editing was performed by JAA and SA. Supervision, further editing, reviewing, and validation were done by AAK, EDO, and OSN. All authors read and approved the final manuscript.

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Correspondence to Joan A. Atullley.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Atullley, J.A., Kwaku, A.A., Owusu-Ansah, E.D.J. et al. Modeling the impact of land cover changes on water balance in the Vea catchment of Ghana, 1985–2040. Sustain. Water Resour. Manag. 8, 148 (2022). https://doi.org/10.1007/s40899-022-00727-9

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  • DOI: https://doi.org/10.1007/s40899-022-00727-9

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