Climate Change and Its Impacts on Water Resources in the Bandama Basin, Côte D’ivoire

Abstract

Abstract:This study aims to assess future trends in monthly rainfall and temperature and its impacts on surface and groundwater resources in the Bandama basin. The Bandama river is one of the four major rivers of Côte d'Ivoire. Historical data from 14 meteorological and three hydrological stations were used. Simulation results for future climate from HadGEM2-ES model under representative concentration pathway (RCP) 4.5 and RCP 8.5 scenarios indicate that the annual temperature may increase from 1.2 • C to 3 • C. These increases will be greater in the north than in the south of the basin. The monthly rainfall may decrease from December to April in the future. During this period, it is projected to decrease by 3% to 42% at all horizons under RCP 4.5 and by 5% to 47% under RCP 8.5. These variations will have cause an increase in surface and groundwater resources during the three periods (2006-2035; 2041-2060; 2066-2085) under the RCP 4.5 scenario. On the other side, these water resources may decrease for all horizons under RCP 8.5 in the Bandama basin.

The Impact of Climate Change on Water Resource Availability in a Trans-Boundary Basin in West Africa: The Case of Sassandra

“…For RCP 4.5, we will reach an increase of 2.1 • C by 2090 (i.e., +9.1%). The variations observed in this study were close to the results of Ardoin et al [19] and Soro et al [44]. Soro et al [44] [19] obtained the same augmentation using for the future climate projections, the HadCM3 model, and the A2 greenhouse gas emission scenario in West Africa.…”

“…The variations observed in this study were close to the results of Ardoin et al [19] and Soro et al [44]. Soro et al [44] [19] obtained the same augmentation using for the future climate projections, the HadCM3 model, and the A2 greenhouse gas emission scenario in West Africa. The monthly inter-annual rainfall observed in the baseline period and projected under RCPs 4.5 and 8.5 for Horizons 2030, 2050, 2070, and 2090 is presented in Figure 5.…”

“…We will have 1330.1 mm, 1310.2 mm, 1295.5 mm, and 1296.6 mm for RCP 4.5 and 1224.7 mm, 1185 mm, 1155.3 mm, and 1088.8 mm for RCP 8.5, respectively, for the Horizons 2030, 2050, 2070, and 2090. This rainfall deficit situation has already been observed by several authors in West Africa for RCPs 4.5 and 8.5 [44,45].…”

“…They used data from the CMIP5 climate model under RCP 4.5 and RCP 8.5 and the hydrological model GR4J. However, Soro et al [44] observed an increase in runoff for RCP 4.5 in the Bandama River Basin (Côte d'Ivoire).…”

Sustainable Hydroelectric Dam Management in the Context of Climate Change: Case of the Taabo Dam in Côte D’Ivoire, West Africa

“…Three climate regimes influence the Bandama Basin. The northern part is characterized by a dry sub-tropical climate (between 1000 mm and 1700 mm) [32], which has a unimodal rainfall distribution or pattern, with distinct wet (rainy) and dry seasons. The central and southern parts of the basin are characterized by two rainy seasons.…”