TITLE:
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)
AUTHORS:
Tanoh Jean-Jacques Koua, Yeganantham Dhanesh, Jaehak Jeong, Raghavan Srinivasan, Kouao Armand Anoh
KEYWORDS:
Modelling, SWAT, Lobo, Eutrophication, Côte d’Ivoire
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.9 No.8,
August
9,
2021
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
(1982-1984) with the evaluation criteria R2, NSE and PBIAS
respectively of 0.64, 0.64 and 3.1. In the validation period (1984-1987), the
model also showed good performance in the streamflow simulation for R2 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.