Hydro-climatic and land use/cover changes in Nasia catchment of the White Volta basin in Ghana

Nyadzi, Emmanuel; Bessah, Enoch; Kranjac-Berisavljevic, Gordana; Ludwig, Fulco

doi:10.1007/s00704-021-03772-0

Cited by 4 publications

(1 citation statement)

References 105 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are 30 settlements dotted around the lake. Lake Volta, as shown in Table 2, is a man-made lake and one of the most studied lakes in Ghana ( Van de Giesen et al, 2010;Codjoe et al, 2020;Nyadzi et al, 2021). It is the largest impoundment with a capacity estimated between 148 and 153 km 3 when the Akosombo dam was constructed for hydropower generation in 1964 (NASA, 2018).…”

Section: Reservoirsmentioning

confidence: 99%

A review of the water resources of Ghana in a changing climate and anthropogenic stresses

Agodzo

Bessah²,

Nyatuame³

2023

Front. Water

Self Cite

View full text Add to dashboard Cite

An extensive narrative review approach is adopted to present existing information on the consumptive and non-consumptive uses and their related issues, such as floods and droughts, climate and the environment in Ghana. Total annual rainfall in the country ranges between 800 mm/y (south-east coat) and 2,000 mm/y (south-west coast) with a bimodal and mono-modal patterns in the south and north, respectively. Annual total runoff from the 3 river systems (the Volta river system, the South-western river system and the Coastal river system) in Ghana is estimated at 40 billion m3 out of about 53 billion renewable freshwater resources. Groundwater yields ranges from 6 m3/h in the Volta basin sedimentary formations to 180 m3/h in the limestone formations. It is estimated that the total water withdrawal as a percentage of total renewable water resources is about 2%. At an average per capita consumption of water of 50 l/p/d, estimated daily water demand for the 2021 population of 31 million people stands at about 566 million m3/y. Current water supply systems are overstretched and it is further estimated that about US $ 240 million is required per year as capital expenditure in urban and rural water supply. Moreover, climate change is projected to increase the scarcity of water in future. Wastewater generated through domestic and industrial uses including storm water in urban Ghana is estimated at about 760 million m3/y. Ghana's irrigation potential to reduce climate change impact on agriculture is put at between 0.36 and 2.9 million ha, accounting for about 66.4% of the consumptive water withdrawal. Estimated water demand for cattle, sheep and goats in 2010 was put at about 22 million m3/y. Other services obtained from surface water are the provision of fish (the Volta Lake is estimated to contributes to 16% of total catch in Ghana); hydropower generation accounting for about 40% of total power installed capacity (Akosombo = 1,020 MW, Kpong = 160 MW, and Bui = 404 MW); water transportation (notably on the Volta Lake); tourist attractions [are 550 km Ghana's shoreline that has about 90 lagoons, the Volta Lake, the lower Volta (e.g., Sogakope, Ada) and some other inland waters like Lake Bosumtwi] and wetlands (recognized by RAMSAR convention of 1971) In the legal context, water governance issues are handled by various institutions created by Acts of Parliament.

show abstract

Section: Reservoirsmentioning

confidence: 99%

A review of the water resources of Ghana in a changing climate and anthropogenic stresses

Agodzo

Bessah²,

Nyatuame³

2023

Front. Water

Self Cite

View full text Add to dashboard Cite

show abstract

利用三维数值模拟进行气候和灌溉情景分析：以Ghana的White Volta流域Nasia次流域为例

et al. 2023

View full text Add to dashboard Cite

Flood risk assessment and adaptation under changing climate for the agricultural system in the Ghanaian White Volta Basin

Smits,

Attoh,

Ludwig

2024

Climatic Change

View full text Add to dashboard Cite

In the context of river basins, the threat of climate change has been extensively studied. However, many of these studies centred on hazard analysis while neglecting the need for comprehensive risk assessments that account for exposure and vulnerability. Hazard analysis alone is not adequate for making adaptive decisions. Thus, to effectively manage flood risk, it is essential to understand the elements that contribute to vulnerability and exposure in addition to hazard analysis. This study aims to assess flood risk (in space and time until the year 2100) for the agricultural system, in the White Volta Basin in northern Ghana. Employing the impact chain methodology, a mix of quantitative and qualitative data and techniques were used to assess hazard, exposure, and vulnerability. Multi-model climate change data (RCP 8.5) from CORDEX and observation data from the Ghana Meteorological Agency were used for hazard analysis. Data on exposure, vulnerability, and adaptation were collected through structured interviews. Results indicate that flood hazard will increase by 79.1% with high spatial variability of wet periods but the flood risk of the catchment will increase by 19.3% by the end of the twenty-first century. The highest flood risk is found in the Upper East region, followed by North East, Northern, Savannah, and Upper West for all four analysed periods. Adaptive capacity, sensitivity, and exposure factors are driven by poverty, ineffective institutional governance, and a lack of livelihood alternatives. We conclude that the region is highly susceptible and vulnerable to floods, and that shifting from isolated hazard analysis to a comprehensive assessment that considers exposure and vulnerability reveals the underlying root causes of the risk. Also, the impact chain is useful in generating insight into flood risk for policymakers and researchers. We recommend the need to enhance local capacity and foster social transformation in the region.

show abstract

Hydro-climatic and land use/cover changes in Nasia catchment of the White Volta basin in Ghana

Cited by 4 publications

References 105 publications

A review of the water resources of Ghana in a changing climate and anthropogenic stresses

A review of the water resources of Ghana in a changing climate and anthropogenic stresses

利用三维数值模拟进行气候和灌溉情景分析：以Ghana的White Volta流域Nasia次流域为例

Flood risk assessment and adaptation under changing climate for the agricultural system in the Ghanaian White Volta Basin

Contact Info

Product

Resources

About