Sediment yield of a forest river basin in Ghana

Kusimi, John Manyimadin; Amisigo, Barnabas; Banoeng-Yakubo, Bruce

doi:10.1016/j.catena.2014.08.001

Cited by 20 publications

(23 citation statements)

References 15 publications

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“…Unfortunately, as it is mainly surface mining, it results in significant destruction of natural vegetation and farm land, removal of soil, and diversion of water bodies. The mining process also leads to dust pollution, water pollution from increase in sediments (Kusimi et al, 2014) and the introduction of mercury which also contaminates soil (Serfor-Armah et al, 2004). In 2011 the Ghana Water Company Limited was forced to temporarily stop treating water because the Birim river was too polluted to be treated for domestic use (Amankwah, 2013).…”

Section: Introductionmentioning

confidence: 99%

Mapping the expansion of galamsey gold mines in the cocoa growing area of Ghana using optical remote sensing

Snapir

Simms

Waine

2017

International Journal of Applied Earth Observation and Geoinfor

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Artisanal gold mining (galamsey) and cocoa farming are essential sources of income for local populations in Ghana. Unfortunately the former poses serious threats to the environment and human health, and conflicts with cocoa farming and other livelihoods. Timely and spatially referenced information on the extent of galamsey is needed to understand and limit the negative impacts of mining. To address this, we use multi-date UK-DMC2 satellite images to map the extent and expansion of galamsey from 2011 to 2015. We map the total area of galamsey in 2013 over the cocoa growing area, using k-means clustering on a cloud-free 2013 image with strong spectral contrast between galamsey and the surrounding vegetation. We also process a pair of hazy images from 2011 and 2015 with Multivariate Alteration Detection to map the 2011-2015 galamsey expansion in a subset, labelled the change area. We use a set of visually interpreted random sample points to compute bias-corrected area estimates. We also delineate an indicative impact zone of pollution proportional to the density of galamsey, assuming a maximum radius of 10 km. In the cocoa growing area of Ghana, the estimated total area of galamsey in 2013 is 27,839 ha with an impact zone of 551,496 ha. In the change area, galamsey has more than tripled between 2011 and 2015, resulting in 603 ha of direct encroachment into protected forest reserves. Assuming the same growth rate for the rest of the cocoa growing area, the total area of galamsey in 2015 is estimated at 43,879 ha. Galamsey is developing along most of the river network (Offin, Ankobra, Birim, Anum, Tano), with downstream pollution affecting both land and water.

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Section: Introductionmentioning

confidence: 99%

Mapping the expansion of galamsey gold mines in the cocoa growing area of Ghana using optical remote sensing

Snapir

Simms

Waine

2017

International Journal of Applied Earth Observation and Geoinfor

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“…The slash and burn method as seen in (Figure 2) ends up destroying or causing bushfires thus depriving the forest of its vast areas of vegetated land that is not intended to be burnt thereby contributing to sediment loads and changing the geomorphology of the streams as seen in (Figure 3) showing a sandy stream bed thus confirming Kusimi, Amisigo, & Banoeng-Yakubo (2014). It also depletes the soil of its essential nutrients after some years according to Hirst (2019), though that is not to say that slash and burn method is not good in another environment, since this method adds another layer of nutrients to the soil.…”

Section: Behavioural Determinants To the Lake's Degradationmentioning

confidence: 80%

Knowledge Relationships in Freshwater Governance

Marian¹,

Stephen²,

Antwi³

et al. 2019

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Freshwater governance (policy formulation and implementation) because governance is about policy formulation and implementation are usually undertaken with little consideration to the thought process of the owners of the resources and resource environment. Even though considerable efforts have been made to the social change theory by incorporating stakeholder's views, the individual-level or local-level insights as well as constructs and environmental connections (cognitive view) in freshwater challenges are usually left out. Using the case study research design, with emphasis on the descriptive design helped to access local knowledge in freshwater governance. The mixed method approach, helped to put together information based on behavioural concerns, the spirituality of the people, and the resource environmental issues required for the analysis and discussion of the data, while drawing meaningful conclusion from data. The results provide a framework, which will help to address interventions that simultaneously address both development and behavioural determinants of freshwater degradation, toward social change conservation policy in reducing crisis in freshwater governance.

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“…The preferred one is the integrating samplers. However, in the absence of depth integrated sampler some researchers such as Akrasi and Ansa-Asare (2008) and Kusimi et al (2014) used the dipping method and applied the necessary correction according to Rooseboom and Annandale (1981) and Demmak (1976). The sampled water was taken to laboratory to determine the suspended sediment concentration through either the evaporation or filtration method.…”

Section: Sediment Yield Assessment and Modelingmentioning

confidence: 99%

“…Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License well as flood and control fishing, in addition to reducing reservoir lifespan and modifying river channel morphology (Mensah, 2009;Kusimi, 2008b;Peng et al, 2008). Thus, reliable information on the expected sediment yield of river basins is important for water resources management and development (Kusimi et al, 2014;Akrasi, 2011).…”

Section: Introductionmentioning

confidence: 99%

Land use change and sediment yield studies in Ghana: Review

Boakye¹,

Anornu²,

Quaye‐Ballard³

et al. 2018

J. Geogr. Reg. Plann.

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Understanding the factors and processes controlling catchment sediment yield is crucial and fundamental to water resources management and development. This review provides an inventory on land use and sediment yield studies in Ghana and explores their existing link. The review through desktop studies analyzed the discussions and related studies on the impact of land use/cover change on sediment yield. Available literature showed that generally sediment yield is sensitive to land use/cover, however, the evidence of the empirical link between land use/cover and the catchment sediment yield is unclear. Though various land use/cover and sediment yield studies have contributed to the understanding of the variations in catchment erosion rate resulting from land use/cover changes, the results do not show strong influence of cover types on sediment yield. The results relate sediment yield to rainfall, runoff and catchment area without exploring the empirical evidence of land use impact. Thus, empirically, the extent to which sediment yield varies with land use /cover changes still remain unclear. Further research is recommended to ascertain the empirical link between land use/cover change and catchment sediment yield.

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Sediment yield of a forest river basin in Ghana

Cited by 20 publications

References 15 publications

Mapping the expansion of galamsey gold mines in the cocoa growing area of Ghana using optical remote sensing

Mapping the expansion of galamsey gold mines in the cocoa growing area of Ghana using optical remote sensing

Knowledge Relationships in Freshwater Governance

Land use change and sediment yield studies in Ghana: Review

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