Browsing by Author "Kallon, Hadji Ds"

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    Development and application of SWAT-MODFLOW in surface water-groundwater interactions: Current status and future challenges
    (Springer Science+Business Media, 2026-01-13) Kallon, Hadji Ds
    Climate change and human activity have placed substantial pressure on water resources, underscoring the critical importance of understanding the surface water and groundwater interactions (SGIs). This article reviews the development and application of the coupled SWAT-MODFLOW model for characterizing SGIs. It highlights three key developmental stages, drawing on the seminal works of researchers. These models are powerful tools for simulating hydrological processes, nutrient transport, and climate change impacts on water resources. However, uncertainties related to parameterization, input databases, and model structure constrain their predictive accuracy. The integrated SWAT-MODFLOW model enhances integrated water resource simulations, but this comes at the cost of increased complexity; by contrast, standalone SWAT and MODFLOW models optimize analyses of surface water and groundwater systems, respectively. A further strength is its ability to accurately simulate SGIs by accounting for diverse influencing factors, though it requires more extensive input data and incurs higher computational costs than individual standalone models. Accordingly, for practical applications, researchers should select an appropriate model and a reasonable set of influencing factors based on the specific research topic and requirements.
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    Integrated Analysis of Water Quality in Artificial Fishponds Using WQI and GIS in South-East Sierra Leone
    (Scientific Research Publishing, 2024) Kallon, Hadji Ds
    Artificial fishponds play a pivotal role in global aquaculture, serving as a source of livelihood and nourishment for many communities. Ensuring the sustained health and productivity of Fishes in these environments relies heavily on water quality management. This assessment was done to determine the water quality of ten artificial fishponds in the south-eastern part of Sierra Leone using twelve physicochemical factors (pH, BOD, EC, TDS, turbidity, COD, Fe2+, Mg2+, Ca2+, NH3, , and alkalinity) to find out the Water Quality Index (WQI) and spatial distribution of respective parameters. The assessment of artificial fishponds using WQI and Inverse Distant Weighting (IDW) integration represents a relatively underexplored area within the domain of environmental water resources. The WQI was determined using the “Weighted Arithmetic Water Quality Index’’ method. The results of WQI in the study area range from 65.05 to 147.26. Several locations have water quality deemed unsuitable for consumption, while others range from good to very poor. It is essential to address and improve water quality in locations categorized as unsuitable for consumption and very poor to ensure safe and healthy water sources. It was also clear from the calculation that the smaller the mean concentration value of the pH as compared to the ideal value (7), the smaller the WQI value and the better the water quality. To keep the artificial fishpond water in good condition, mass domestic use should be controlled, and draining of surrounding organic matter should be stopped in ponds Bo\_001, Kenema\_001, and Kenema\_002.
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