Water balance responses to land-use/land-cover changes in the Pra River Basin of Ghana, 1986–2025

Awotwi, Alfred; Anornu, Geophrey K.; Quaye‐Ballard, Jonathan Arthur; Annor, Thompson; Forkuo, Eric Kwabena; Harris, Emmanuel; Agyekum, Jacob; Terlabie, John Lawer

doi:10.1016/j.catena.2019.104129

Cited by 55 publications

(38 citation statements)

References 56 publications

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“…By using multiple land-use maps with linear interpolation (the same methodology in this research), updated time stamps have led to more realistic conditions in the modeling [18]. After the determination of suitable land-use input conditions in a simulation, the critical subwatersheds can be appreciated in terms of their detailed internal processes, as well as further scenarios, including runoff and sediment at the watershed scale [48]. Some researchers have already emphasized the impacts of landuse changes on flow, total nitrogen, total phosphorus [18,20,21], and sediment yield [23,24].…”

Section: Discussionmentioning

confidence: 99%

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The Impacts of Land-Use Input Conditions on Flow and Sediment Discharge in the Dakbla Watershed, Central Highlands of Vietnam

Tram

Somura

Moroizumi

2021

Water

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The main objective of this study was to evaluate various land-use input conditions in terms of the performance improvement found in consequent flow and sediment simulations. The soil and water assessment tool (SWAT) was applied to the Dakbla watershed from 2000 to 2018. After the calibration and validation processes, dissimilar effects between the input conditions on the flow and sediment simulations were confirmed. It was recognized that the impact of the land use on the sediment simulation was more sensitive than with the flow simulation. Additionally, through monthly evaluation, the effects against the flow and sediment in the rainy season were larger than those in the dry season, especially for sediment simulation in the last three months from October to December. Changing land-use conditions could improve flow and sediment simulation performance better than the performance found with static land-use conditions. Updated land-use inputs should be considered in simulations if the given land-use condition changes in a relatively short period because of frequent land-use policy changes by a local government.

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Section: Discussionmentioning

confidence: 99%

“…One of the negative consequences of ongoing urbanization is an increase in deforestation [24]. Increasing areas of urban and agricultural lands at the expense of closed and open forests results in direct impacts on surface runoff, baseflow, and water yields [48].…”

Section: Influence Of Land-use Update For Flow and Sediment Simulationmentioning

confidence: 99%

The Impacts of Land-Use Input Conditions on Flow and Sediment Discharge in the Dakbla Watershed, Central Highlands of Vietnam

Tram

Somura

Moroizumi

2021

Water

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“…In view of this, accurate estimation of ET at both local and regional scales remains a fundamental tool for water resources planning and management ( Allen et al., 2007 ; Kundu et al., 2018 ; Li et al., 2018 ). Intriguingly, ET is the most complex hydrologic parameter to estimate ( Bastiaanssen et al., 1998 ; Sett et al., 2018 ) as it depends on factors such land use land cover (LULC) and climate change ( Li et al., 2017 ) whose dominance is influenced by anthropogenic activities ( Awotwi et al., 2019 ). ET is highly affected by LULC properties such as Normalized Difference Vegetation Index (NDVI) and Leaf Area Index (LAI) which collectively express the percentage of leaf area covering the land to the total area of cultivated land.…”

Section: Introductionmentioning

confidence: 99%

Estimating the spatial distribution of evapotranspiration within the Pra River Basin of Ghana

Nsiah

Gyamfi

Anornu

et al. 2021

Heliyon

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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 distribution of ET within the Pra River Basin (a forest ecological zone) of Ghana, using cloud-free Landsat 8 (OLI/TIRS) satellite images employing the SEBAL methodology. The study further estimates the spatial distribution ET in relation to major climatic variables, Land Use Land Cover (LULC) types and energy balance components. The overall spatial distribution of ET had a mean value of 5.63 mm/day. Spatial distribution of ET (mm/ day) for water body (5.51-7.81) and uncultivated forest (5.10-7.71) were high, while moderately average values were observed for logged forest (4.80-7.51). Settlement and bare landscapes observed low rates ((2.05-5.10) mm/day). Spatially, ET was higher in the upper western, central and the eastern parts of the basin, but lower in the northern part and pockets of areas at the southern part of the basin where settlement/bare landscape and logged forest dominate. Areas with high temperature and high solar radiation experiences high ET, while low wind speed, low to average temperature and solar radiation areas experience low ET. Also, areas with both high net radiation and ground heat flux but low to average sensible heat flux experiences high ET and vice versa. Linear regression analysis showed good fit with slope of 0.76 and R 2 of 0.93 indicating that 93 % of the variations in observed field measurement of ET fitted perfectly well with ET distributions generated by the SEBAL model.

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“…In Ghana, the Pra river catchment has gained increasing attention due to deforestation and illegal mining without land reclamation. These activities have significantly altered the eco-hydrology of the catchment in surface runoff ( Awotwi et al, 2019 ), and coastal and urban flooding ( Awotwi et al, 2017 ). Similarly, perennial urban and flash floods from short but high-intensity rainfall, in hand with weak drainage system network have been exacerbated as settlement rate increased to about 130% between 1986 and 2016 ( Awotwi et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Estimation of the return periods of maxima rainfall and floods at the Pra River Catchment, Ghana, West Africa using the Gumbel extreme value theory

Osei

Amekudzi

Omari-Sasu

et al. 2021

Heliyon

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The Pra river catchment in Ghana is adversely affected by perennial flooding from high-intensity rainfall events. To aid in flood management at the catchment, the Gumbel extreme value distribution has been used to estimate the return periods of maxima rainfall, flood, and consecutive dry and wet days (CDD and CWD) for a period of 5 to 100 years. The results revealed an expected increase in maxima rainfall, CDD and CWD. Maxima rainfall favours the south of the catchment while the CDD decreases northward. Furthermore, an increase in the magnitude of CWD observed at the centre of the catchment had a maximum of approximately 30 days for the 100 year return period, while lower flood volumes had a higher recurrence of 50% to 100% for 1 to 2 year return periods. The inclusion of a projected increase in anthropogenic activities and climate factors at the catchment will slightly affect the magnitude of these variables for the various return periods. Nonetheless, the findings in this study will be of essential input to policy implementation of the Integrated Water Resource Management Plan for river catchments in Ghana, West Africa.

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Water balance responses to land-use/land-cover changes in the Pra River Basin of Ghana, 1986–2025

Cited by 55 publications

References 56 publications

The Impacts of Land-Use Input Conditions on Flow and Sediment Discharge in the Dakbla Watershed, Central Highlands of Vietnam

The Impacts of Land-Use Input Conditions on Flow and Sediment Discharge in the Dakbla Watershed, Central Highlands of Vietnam

Estimating the spatial distribution of evapotranspiration within the Pra River Basin of Ghana

Estimation of the return periods of maxima rainfall and floods at the Pra River Catchment, Ghana, West Africa using the Gumbel extreme value theory

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