[ Evaluation à long terme de l’impact de la dynamique de l’occupation des sols sur les écoulements dans le bassin versant du Haut Bandama (Nord Côte d’Ivoire) ]
Volume 67, Issue 2, July 2023, Pages 302–323
OUEDE Gla Blaise1, Kouadio Zilé Alex2, Yao Affoué Berthe3, Kouassi Kouakou Lazare4, and Diedihou Arona5
1 University Jean Lorougnon Guédé, BP 150 Daloa, Côte d’Ivoire
2 Geoscience et environnement, Jean Lorougnon Guédé, Daloa, Côte d’Ivoire
3 Geoscience et environnement, Jean Lorougnon Guédé, Daloa, Côte d’Ivoire
4 Geoscience et environnement, Jean Lorougnon Guédé, Daloa, Côte d’Ivoire
5 Institut de Recherche et de Développement (IRD), Abidjan, Côte d’Ivoire
Original language: French
Copyright © 2023 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Land use changes are mainly driven by human activities and climate change. Uncontrolled land use can alter surface runoff and affect several sectors of activity such as agriculture, hydropower, drinking water supply, sanitation, etc. The main objective of this study is to assess the influence of changes in land surface conditions on runoff in the Haut Bandama catchment. For this purpose, LANDSAT satellite images from 1990, 2006 and 2020 were used. These images were processed by the maximum likelihood supervised classification method under ENVI to establish the land use maps. Based on the past land use trends, a future prediction (2035 and 2050) is made using the Land Change Modeler. The diachronic analysis of the land use maps for the period 1990-2020 showed a decline in the area of forest and savannah patches, followed by that of water bodies. Conversely, the area of built-up and bare land as well as crops and fallow land is increasing. The same dynamics are predicted for the 2035 and 2050 horizons, where the savannah class dominates most of the net changes. The dynamics of the land surface condition has led to an increase in the runoff coefficient from 1990 to 2020 from 18.5% to 30.7% respectively. This evolution continues until 2050 with 34.5% in 2035 and 36.4% in 2050.
Author Keywords: Land use, runoff, LCM, Upper Bandama catchment, Ivory Coast.
Volume 67, Issue 2, July 2023, Pages 302–323
OUEDE Gla Blaise1, Kouadio Zilé Alex2, Yao Affoué Berthe3, Kouassi Kouakou Lazare4, and Diedihou Arona5
1 University Jean Lorougnon Guédé, BP 150 Daloa, Côte d’Ivoire
2 Geoscience et environnement, Jean Lorougnon Guédé, Daloa, Côte d’Ivoire
3 Geoscience et environnement, Jean Lorougnon Guédé, Daloa, Côte d’Ivoire
4 Geoscience et environnement, Jean Lorougnon Guédé, Daloa, Côte d’Ivoire
5 Institut de Recherche et de Développement (IRD), Abidjan, Côte d’Ivoire
Original language: French
Copyright © 2023 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Land use changes are mainly driven by human activities and climate change. Uncontrolled land use can alter surface runoff and affect several sectors of activity such as agriculture, hydropower, drinking water supply, sanitation, etc. The main objective of this study is to assess the influence of changes in land surface conditions on runoff in the Haut Bandama catchment. For this purpose, LANDSAT satellite images from 1990, 2006 and 2020 were used. These images were processed by the maximum likelihood supervised classification method under ENVI to establish the land use maps. Based on the past land use trends, a future prediction (2035 and 2050) is made using the Land Change Modeler. The diachronic analysis of the land use maps for the period 1990-2020 showed a decline in the area of forest and savannah patches, followed by that of water bodies. Conversely, the area of built-up and bare land as well as crops and fallow land is increasing. The same dynamics are predicted for the 2035 and 2050 horizons, where the savannah class dominates most of the net changes. The dynamics of the land surface condition has led to an increase in the runoff coefficient from 1990 to 2020 from 18.5% to 30.7% respectively. This evolution continues until 2050 with 34.5% in 2035 and 36.4% in 2050.
Author Keywords: Land use, runoff, LCM, Upper Bandama catchment, Ivory Coast.
Abstract: (french)
Les changements d’occupation des sols ont pour principaux facteurs les activités anthropiques et le changement climatique. La non maitrise du mode d’occupation des sols peut modifier les écoulements de surface et affecter plusieurs secteurs d’activité tels que l’agriculture, l’hydroélectricité, l’approvisionnement en eau potable, l’assainissement, etc. Cette étude a pour objectif principal d’évaluer l’influence des mutations de l’état de surface du sol sur le ruissellement du bassin versant du Haut Bandama. Pour ce faire, des images satellitaires LANDSAT de 1990, 2006 et 2020 ont été utilisées. Ces images ont été traitées par la méthode de classification supervisée du maximum de vraisemblance sous ENVI pour établir les cartes d’occupation du sol. Sur la base des tendances d’occupation des sols passées, une prédiction future (2035 et 2050) est faite à l’aide du modèle Land Change Modeler. L’analyse diachronique des cartes d’occupation des sols de la période 1990-2020 a permis d’observer une régression de la superficie des lambeaux de forêts et de savanes, suivie de celle des plans d’eau. A l’inverse, la superficie des bâtis et sols nus ainsi que des cultures et jachères sont en augmentation. Cette même dynamique est prédite aux horizons 2035 et 2050 où la classe de savane est prépondérante dans la plupart des changements nets. La dynamique de l’état de surface des sols a entrainé une augmentation du coefficient de ruissellement de 1990 à 2020 qui passe de 18,5% à 30,7% respectivement. Cette évolution se poursuit jusqu’à l’horizon 2050 avec 34,5% en 2035 et 36,4% en 2050.
Author Keywords: Occupation des sols, ruissellement, LCM, bassin versant du haut Bandama, Côte d’Ivoire.
How to Cite this Article
OUEDE Gla Blaise, Kouadio Zilé Alex, Yao Affoué Berthe, Kouassi Kouakou Lazare, and Diedihou Arona, “Long-term evaluation of the impact of land use dynamics on runoff in the Haut Bandama watershed (Northern Ivory Coast),” International Journal of Innovation and Scientific Research, vol. 67, no. 2, pp. 302–323, July 2023.
