
Charles GyamfiKwame Nkrumah University of Science and Technology | KNUST · Department of Civil Engineering
Charles Gyamfi
PhD Civil Engineering
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58
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Publications (58)
Soil erosion is a major land degradation issue affecting various facets of human lives. To curtail soil erosion occurrence requires understanding of soil properties and how they influence soil erosion. To this end, the soil erodibility index which gives an indication of the susceptibility of soils to erosion was examined. In particular, we aimed to...
The provision and control of water resources is becoming increasingly expensive with semi-arid regions experiencing significant issues with soil loss, sedimentation, and river erosion. This paper sought to investigate the current rate of sediment transport, capacity and bathymetry of the Weija reservoir by establishing discharge and sediment rating...
This paper examines the water quality of the Aboabo River in Kumasi, Ghana using the Canadian Council of Ministers of the Environment water quality index (CCME-WQI).Water samples were collected from five sampling stations namely; Pankrono, Moshie Zongo, Aboabo, Asokwa and Atonsu. The model employs both bacteriological and physicochemical parameters...
In 2015, Ghana launched the National Drinking Water Quality Management Framework (NDWQMF) to promote a risk-based approach to water quality through water safety plans (WSPs). This study uses a narrative review to synthesize WSP implementation progress in Ghana, identify gaps in practice, and provide recommendations for enhanced effectiveness and sc...
Water availability for domestic, institutional, and agricultural production is threatened by the continuous change
in land use land cover (LULC). These changes in LULC features affect the dynamics of the hydrological processes
such as surface runoff, infiltration, and evapotranspiration, resulting in variations in water availability especially,...
Water has prominence over all the usable natural resources to humankind due to its very significance to human life. Approximately, 70% of Ghana's populace relies on groundwater exploitation for freshwater consumption. Managed aquifer recharge is capable of sustaining water resources for all livelihood activities. Underperformance of MAR systems is...
Sub-Saharan Africa faces a number of essential issues, including water quality. As such, evaluating the surface water quality of lakes and reservoirs is a crucial part of environmental monitoring and management. Especially in a region where these water bodies serve as a source of livelihood for communities living around them. Water quality paramete...
Perturbations in extreme precipitation characteristics are investigated over the Volta Basin (VB) and its three subdomains (Sahel, Soudano-Sahel and Guinea Coast) for the early-21st (2030–2053) and mid-twenty-first centuries (2057–2080) under representative concentration pathways (RCPs) 4.5 and 8.5. Seven climate indices from the Expert Team on Cli...
Nitrate (NO3⁻) contamination threatens the quality of groundwater in many agricultural areas, and excessive NO3⁻ consumption may cause adverse human health implications. Determination of NO3⁻ occurrence and its source of contamination is essential for the effective management of groundwater quality. The characteristics of NO3⁻ in groundwater from t...
Researchers assessed the performance of L2 satellite soil moisture estimates from the European Space Agency’s SMOS satellite using in-situ data from capacitance SM probes. The in-situ measurements are from monitoring stations (at 10, 20, 30 cm depth) at two sites, Yendi and Jirapa in the Northern part of Ghana, West Africa. They are in two differen...
The study employed pairwise statistics (BIAS, R and NSE) to assess the potential of five different satellite rainfall products (CHIRPS, PERSIANN, TRMM, RFE, and ARC) in reproducing the hydrology of the Black Volta Basin. This was achieved by using the HEC-HMS model calibrated with observed streamflow data from three gauged stations (Lawra, Chache a...
Study region: Odaw River Basin (ORB) in Ghana Study focus: We simulated and examined the impacts of retention basin as a hydraulic structure in attenuating the flood peaks downstream of the ORB with a coupled HEC-HMS and HEC-RAS models for different flood scenarios. Calibrated and validated HEC-HMS models were used to forecast floods in terms of pe...
The Amansie West District is characterized by extensive land degrading activities. The district has become a nexus for vast illegal small-scale mining activities, thus affecting the sustainability of other land uses. It is thus imperative, that the land use land cover (LULC) trends over the years be monitored. This would aid assessment of changes o...
To ensure that groundwater resources are effectively protected and to improve the quality of life, it is vital to take into consideration all polluting activities that could pose a potential risk to the resource. Groundwater potential research conducted only covers 5% of Montserrado County excluding Greater Monrovia in Liberia. Although this little...
Remote Sensing and satellite altimetry can monitor fresh water resources given the worldwide decline in conventional in-situ level gauging stations. In many hydrological and hydraulic applications, satellite altimetry is being recognized as a vital source of data. However, the reliability of the many sensors used to monitor the water level via sate...
The study investigated potential sites for the development of Small Hydropower Systems (SHP) to augment the existing energy supply in the UDRB. Remote sensing and the Soil and Water Assessment Tool (SWAT) were employed to generate and simulate basin parameters for the hydropower analysis. The energy potential of suitable sites was evaluated using f...
The performance of four Near-Real-Time Satellite-Based Rainfall Estimates (NRT_SREs) was evaluated across the Volta basin from January 2019 to December 2020: Global Satellite Mapping of Precipitation (GSMaP_NRT), Integrated Multi-satellitE Retrievals for Global Precipitation Measurement-Early run (IMERG-E), Precipitation Estimation from Remotely Se...
The Black Volta River basin faces several challenges, which impedes the sustainability of its water resources and biodiversity. Climate change coupled with land use/land cover (LULC) change patterns accounts for most of the observed hydrological changes in the basin. The aim of this study was to assess the impact of changes in climate and LULC on w...
Water, Energy and Food (WEF) are inextricably linked, and the Water-Energy-Food nexus (WEF nexus) provides a comprehensive framework for addressing the complex and intricate interconnections in the development of these invaluable resources. Quantifying the interconnections among energy, water, and food sectors is a preliminary step to integrated WE...
The availability of water in the Senegal River basin is a basic issue for moving towards efficient resource management. Given the extent of the river and the large number of stations, hydrological modelling is a reliable means of assessing the evolution of the water balance and availability over the last 30 years. This paper aims to evaluate water...
The Afram Plains watershed is one of the major watersheds located at the lower part of the Volta Basin in Ghana with high groundwater usage. Dependency on groundwater is a fast-growing concern in the plains due to the unreliable supply of surface water. This has put the groundwater resources under intense pressure and has necessitated the need for...
The likelihood of changing trends in climatic time series over the Pra River Basin in Ghana was examined. Trend analyses were carried out on monthly, seasonal, and annual timescales for temperature and rainfall from 1950 to 2010. The use of Modified Mann–Kendall, Sen’s slope and Pettit tests revealed warming trends over the Pra River Basin. Maximum...
The performance of satellite Rainfall Estimates (RFE, version 2.0) at daily resolution was evaluated in comparison with ground-based meteorological datasets (GBD) by applying statistical and hydrological modeling approaches. In-situ daily rainfall observations from 5 stations in and around the periphery of the Nasia river basin in Ghana, covering a...
Gold mining is extremely valuable for countries involved in it due to the potential for employment, income allocation and socio-economic development. As a result of the attraction of international investors by governments of countries rich in this natural resource and increasing gold prices, large-scale, small-scale and unlicensed and illegal (Gala...
It is important in water resource planning to accurately estimate the spatial distribution of evapotranspiration (ET) as an input parameter for hydrological studies. Although, conventional pan evaporation, lysimetric and eddy covariance techniques have been used, they only estimate point values. Hence, this study aimed at estimating the spatial dis...
Study region
Pra River Basin (PRB) located in Ghana
Study focus
Now, hydrological and climate change impact studies are shifting towards reliance on openly accessible databases particularly for regions with limited observed datasets. There is therefore the need to evaluate the reliability of such datasets in order to reduce modelling uncertainties...
This study evaluated the performance of five satellite rainfall products (CHIRPS, PERSIANN, TRMM, RFE, and ARC) in the Black Volta Basin (BVB) using four performance evaluation methods: pairwise statistics, categorical statistics, rainfall intensity distribution, and extreme rainfall indices. In all, 21 rainfall stations distributed across the BVB...
The effect of different land use types on the physicochemical water quality of a semi-arid coastal basin is examined. From nine sites, a comprehensive sampling campaign was executed during October 2018 to January 2019. One-way analysis of variance (ANOVA), Pearson correlation and multiple regression analyses were used to determine the relationship...
Study region
: Lower Pra River (LPR) Basin, Ghana
Study focus
: This study examines the potential for Small Hydropower Development in a semi-arid environment albeit the lack of data. Geographic and site specific information acquired through geographic and remote sensing techniques are applied in a physically based semi-distributed hydrologic model...
The present study examines the trends of hydro-climatic parameters over the Black Volta Basin in Ghana. Trend analysis was carried at different time scales (i.e., monthly, seasonal, and annual) from 1961 to 2016. Modified Mann–Kendall (MMK) test, Sen’s slope estimates, and Pettit–Mann–Whitney test were applied to compute the existence of a trend, t...
We present here an evaluation of the water quality of an inland watercourse, the Densu River, using multivariate statistical approaches; Principal Component and Cluster Analyses. Sixteen (16) physicochemical parameters were analysed from river water samples for ten (10) different stations. The sampling campaigns were done for four months, October 2...
A physically based model; Soil and Water Assessment Tool (SWAT) and bathymetric data were integrated to simulate and evaluate the water balance of the Brimsu Reservoir from 2002 to 2018. The simulated water balance describes the changes in water storage of the reservoir as a hydrological component that is dependent on inflows (precipitation, runoff...
This study examined four Regional Climate Models (RCMs) from Coordinated Regional Climate Downscaling Experiment-Africa which are widely used in Africa researches, to select the best performing model against gridded observational dataset over the Kpong Irrigation Scheme area with data from 1964 to 2005. Statistical tools such as correlation coeffic...
This study examined four Regional Climate Models (RCMs) from Coordinated Regional Climate Downscaling Experiment-Africa which are widely used in Africa researches, to select the best performing model against gridded observational dataset over the Kpong Irrigation Scheme area with data from 1964 to 2005. Statistical tools such as correlation coeffic...
The study presents a more recent historical analysis of hydro-meteorological droughts in the Olifants Basin, South Africa from 1980 to 2013 using the Standardized Precipitation Index (SPI), the Standardized Precipitation Evapotranspiration Index (SPEI) and the Streamflow Drought Index (SDI). Time series of SPI, SPEI and SDI were analyzed for drough...
Simulation-optimization models have been widely developed and used for many decades in groundwater resource management. However, simulation-optimization models in most applications encompass data that are subject to uncertainty. Groundwater aquifer hydrogeology condition is highly uncertain; hence it is important that this uncertainty is taken into...
Groundwater constitutes an essential resource that augments surface water resources in meeting the water supply needs of man and the ecosystem. Most importantly in arid and semi-arid environments where rainfall patterns are erratic, groundwater resources are often the preferred source of water. This causes enormous pressure on the resource leading...
Water resources of the world are currently under increasing threat due to climate change, environmental degradation and misappropriation of the available limited resources. The stresses that have developed are explicitly the aftermath of anthropogenic activities that occur within basins. Of significant impact are the changes observed in land use an...
This paper discusses the hydrological impacts of land use changes on the Olifants Basin in South Africa using the Soil andWater Assessment Tool (SWAT). A three-phase land use scenario (2000, 2007 and 2013) employing the "fix-changing" method was used to simulate the hydrology of the Olifants Basin. Changes in land uses were related to different hyd...
Intensified human activities over the past decades have culminated in the prevalence of dire environmental consequences of sediment yield resulting mainly from land use changes. Understanding the role that land use changes play in the dynamics of sediment yield would greatly enhance decision-making processes related to land use and water resources...
Groundwater is an inimitable resource that provides water to communities especially in arid and semi-arid regions. However, the spatial variability of the resource as well as the heterogeneity and complex nature of aquifer systems that store groundwater presents difficulties for groundwater development. Thus, understanding the spatial structure of...
Anthropogenic activities in river basins have culminated into land use and land cover changes (LULCCs) resulting in environmental consequences of sediment generation. Understanding the role that LULCCs play in the dynamics of sediment yield would greatly enhance decision making processes that borders on land use and water resources management. We i...
A set of homogeneity test methods and the Mann-Kendall trend test were applied on historical rainfall records of the Olifants Basin to detect changes in rainfall pattern under a changing climate. In total, historical rainfall records from 13 stations obtained from the South African Weather Service (SAWS) and the Department of Water Affairs (DWA) sp...
Presented in this paper is an assessment of groundwater potential in the Bawku West District of the Upper East region of Ghana. Pumping test data acquired from 74 boreholes have been analysed to determine the sustainability or otherwise of boreholes in the district. Aquifer characteristics including transmissivity and sustainable yield have been as...
Soils properties show both spatial and temporal variability at different scales. The representation of processes and properties at a scale different from the one at which observations and measurements are made is a universal problem in soil science, since these measurements are dependent on the scale of observation. Fractal models assume that this...
Potential areas for the use of Small Reservoirs and Stone Bunds as agricultural water management interventions have been assessed using Weighted Overlay Analysis (WOA). The four key parameters that were combined to obtain the suitability levels of the interventions are runoff, soil type, land use/cover and slope. The results indicate high potential...
Water as a resource is vital for both social and economic development. Notwithstanding these roles, the water resources availability of the Black Volta basin which is in a semi-arid region is threatened by climate change and high population growth rate. These challenges increase the competition for the limited water resources which could result in...
Questions
Question (1)
I am currently modelling a watershed in Africa for sediment yield. Unfortunately there is no observed sediment yield data for the area under study. Is there anyway i can calibrate and validate the model without measured data?
Thank you.