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Modeling Hydrological Functioning of a Drainage Basin With Relation to Land Use Change in the Context of Climate Change: Ourika Watershed Case Study
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Author(s): Reda Rihane (High Commission for Water and Forest and Combating Desertification, Morocco), Abdellatif Khattabi (National School of Forestry Engineering, Morocco), Nabil Rifai (High Commission for Water and Forest and Combating Desertification, Morocco)and Said Lahssini (National School of Forestry Engineering, Morocco)
Copyright: 2019
Pages: 20
Source title:
Geospatial Technologies for Effective Land Governance
Source Author(s)/Editor(s): Moha El-Ayachi (Institut Agronomique et Vétérinaire Hassan II, Morocco)and Loubna El Mansouri (Institut Agronomique et Vétérinaire Hassan II, Morocco)
DOI: 10.4018/978-1-5225-5939-9.ch012
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Abstract
Ourika basin in Morocco has very steep slopes with impermeable ground favoring water flows and flooding. History has shown deadly flood events. Floods are becoming recurrent and exacerbated not only by human activities that degrade soil and vegetation cover, accelerating erosion and quick water flows, but also by climate change. In fact, the basin has experienced a very strong dynamic of its vegetation cover, during the last 30 years, and has been subject to climate change impacts. This study is devoted to evaluating the impact of land cover change, mainly vegetation cover, on hydrological functioning of the basin. The HEC-HMS model was used to simulate basin hydrological response, according to two scenarios of land cover change. The first scenario simulates deforestation and urbanization impacts on peak flows, showing an increase of the peak flow by 31.68%. The second evaluates the impact of both reforestation actions and proscription of forest harvesting in the region. The simulated results showed a decline of 17.25% in peak flows, except for heavy precipitation events.
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