Implementation of the Semi-Distributed SWAT (Soil and Water Assessment Tool) Model Capacity in the Lobo Watershed at Nibéhibé (Center-West of Côte D’Ivoire)

Abstract

The Lobo watershed is an agricultural area where the use of fertilizers by farmers is intensive, causing eutrophication problems that deteriorate the quality of drinking water distributed to the population. Since the phenomenon of eutrophication is directly linked to runoff, it is essential to model the flow in order to better control the transfer of nutrients responsible for eutrophication. It is within this framework that this study was conducted. The objective of this study is to assess the ability of the semi-distributed SWAT (Soil and Water Assessment Tool) model to simulate runoff in the Lobo watershed. The methodology adopted was based on the use of the QSWAT graphical interface to manipulate and execute the main functions of the SWAT model from QGIS tools. The hydrological modeling was carried out with the QSWAT interface for SWAT 2012. The results showed good performance for the flow calibration (1982)(1983)(1984) with the evaluation criteria R 2 , NSE and PBIAS respectively of 0.64, 0.64 and 3.1. In the validation period (1984)(1985)(1986)(1987), the model also showed good performance in the streamflow simulation for R 2 and NSE of 0.84 and 0.76 respectively as values. However, for the PBAIS criterion, the result was less good but still remains satisfactory with a value of 19.6. It emerges from this study that the SWAT model is suitable for simulating water transfer and can therefore be used to study the transfer of pollutants in the fight against eutrophication in the Lobo watershed.

Understanding the Interactions of Climate and Land Use Changes with Runoff Components in Spatial-Temporal Dimensions in the Upper Chi Basin, Thailand

“…The QSWAT is a hydrological model that can simulate physical basins by distributing the parameters according to the physical conditions of the actual area. It is also able to predict the effects of climate change and land use on runoff, sediment, and agricultural chemicals [36][37][38][39][40][41]. In addition, its calculation process is highly reliable and is widely used not only in Thailand, but also around the world [42].…”

Fight against Eutrophication of the Lobo River in Daloa (Central‐West Ivory Coast): Methodology for Applying a Pollutant Transfer Model through a Vegetative Filter Strip

“…The Lobo reservoir is used by the Cote d'Ivoire Water Distribution Company (SODECI) to supply drinking water to the Daloa town populations and its surrounding areas as well as to meet the water needs of agropastoral activities. The work carried out by Koua et al [8], Soro et al [9], N'goran et al [10] showed a spatial distribution of nutrients from mineral fertilizers applied to plants. This distribution predisposes ivorian reservoirs, particularly the Lobo reservoir to an enrichment of nutrient elements responsible for the observed eutrophication phenomenon in that reservoir.…”

“…MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions, or products referred to in the content. 2 eutrophication problems [4]. The case of the Lobo reservoir highlighted by Maïga et al [5] is representative.…”