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Climate and Land-Use Change Impacts on Flood Hazards in the Mono River Catchment of Benin and Togo

Author

Listed:
  • Nina Rholan Houngue

    (Department of Geography, University of Bonn, 53115 Bonn, Germany)

  • Adrian Delos Santos Almoradie

    (Department of Geography, University of Bonn, 53115 Bonn, Germany)

  • Sophie Thiam

    (Center for Development Research (ZEF), Zentrum für Entwicklungsforschung, Genscherallee 3, 53113 Bonn, Germany
    Senegalese Agricultural Research Institute, Tambacounda BP 211, Senegal)

  • Kossi Komi

    (Laboratory of Research on Spaces, Exchanges and Human Security, Department of Geography, University of Lomé, Lomé 01BP1515, Togo)

  • Julien G. Adounkpè

    (Laboratory of Applied Ecology, Faculty of Agronomic Sciences, University of Abomey-Calavi, Abomey-Calavi P.O. Box 526, Benin)

  • Komi Begedou

    (West African Science Service Centre on Climate Change and Adapted Land Use (WASCAL), Université de Lomé, Lomé 01BP1515, Togo)

  • Mariele Evers

    (Department of Geography, University of Bonn, 53115 Bonn, Germany)

Abstract

Flooding is prominent in West Africa, and is expected to be exacerbated, due to global climate and land-use changes. This study assessed the impacts of future climate and land-use changes on flood hazards in the Mono river catchment area of Benin and Togo. Climate scenarios from the representative concentration pathways, RCP 4.5 and RCP 8.5, and land-use projection at the horizon of 2070 were used for runoff simulation at the Athiémé outlet, and flood mapping in the lower Mono river basin. The planned Adjarala dam was also simulated, to evaluate its potential impact. The Soil and Water Assessment Tool (SWAT) was used to investigate the impact of the projected changes on runoff, while the flood-water extent was simulated using the two-dimensional TELEMAC-2D model. TELEMAC-2D was validated with satellite observation and in a participatory way with local stakeholders. SWAT showed good performance during the calibration (KGE = 0.83) and validation (KGE = 0.68) steps. Results show an increase in the magnitude of flood extremes under future climate- and land-use-change scenarios. Events of 10-year return periods during 1987–2010 are expected to become 2-year return-period events under the climate- and land-use-change scenarios considered. The planned Adjarala dam showed potentials for extreme-peak and flood-extent reduction. However, flow-duration curves revealed that the discharge of the river during low-flow periods may also be reduced if the Adjarala dam is built. Adaptation measures as well as sustainable land-use and dam-management options should be identified, to alleviate the impacts of the projected changes.

Suggested Citation

  • Nina Rholan Houngue & Adrian Delos Santos Almoradie & Sophie Thiam & Kossi Komi & Julien G. Adounkpè & Komi Begedou & Mariele Evers, 2023. "Climate and Land-Use Change Impacts on Flood Hazards in the Mono River Catchment of Benin and Togo," Sustainability, MDPI, vol. 15(7), pages 1-31, March.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:7:p:5862-:d:1109528
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    References listed on IDEAS

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    1. I. G. Pechlivanidis & B. Arheimer & C. Donnelly & Y. Hundecha & S. Huang & V. Aich & L. Samaniego & S. Eisner & P. Shi, 2017. "Analysis of hydrological extremes at different hydro-climatic regimes under present and future conditions," Climatic Change, Springer, vol. 141(3), pages 467-481, April.
    2. Sophie Thiam & Eric Ariel L. Salas & Nina Rholan Hounguè & Adrian Delos Santos Almoradie & Sarah Verleysdonk & Julien G. Adounkpe & Kossi Komi, 2022. "Modelling Land Use and Land Cover in the Transboundary Mono River Catchment of Togo and Benin Using Markov Chain and Stakeholder’s Perspectives," Sustainability, MDPI, vol. 14(7), pages 1-22, March.
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    Cited by:

    1. Adrian Delos Santos Almoradie & Nina Rholan Houngue & Kossi Komi & Julien Adounkpe & Mariele Evers, 2023. "Transboundary Collaborative Modeling: Consensual Identification and Ranking of Flood Adaptation Measures—A Case Study in the Mono River Basin, Benin, and Togo," Sustainability, MDPI, vol. 15(15), pages 1-17, July.

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