Modelling and forecasting reservoir sedimentation of irrigation dams in the Guinea Savannah Ecological Zone of Ghana

Adongo, Thomas Apusiga; Abagale, Felix K.; Agyare, Wilson Agyei

doi:10.2166/wpt.2021.073

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…As a result of inadequate implementation of reservoir management techniques, such as sediment routing, regular sediment flushing, and catchment management aimed at minimizing soil erosion, the accumulation of sediments in reservoirs has become an inescapable issue. This problem has steadily escalated, impacting numerous nations globally (Adongo et al, 2021;Michalec and Cupak, 2021).…”

Section: Introductionmentioning

confidence: 99%

Understanding sedimentation trends to enhance sustainable reservoir management in the Angereb reservoir, Upper Blue Nile Basin, Ethiopia

Tessema,

Zimale,

Kebedew

2024

Front. Water

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Reservoir sedimentation is a significant issue that shortens reservoir life and impacts operations such as irrigation, hydropower, and drinking water supply because it significantly reduces the reservoir’s initial capacity. Information on changes in the storage capacity is required to reduce the risk of reservoir sustainability. This study was conducted on the Angereb reservoir in the sub-humid region of Ethiopia, in the Upper Blue Nile Basin. Bathymetric surveys and ArcGIS 10.8 were used to estimate the sedimentation and service life of the Angereb reservoir. A Triangulated Irregular Network (TIN) surface was developed from the survey data to estimate the volume of the reservoir. Based on the findings of this bathymetry a total of 2.18 Mm3 of sediment was deposited on the reservoir bed between 2007 to 2022. Storage capacity was decreased by 62.28% in 16 years of operation and caused an average annual volume reduction of 3.9%. The sediment yield (SY) and specific sediment yield (SSY) of the Angereb watershed revealed 192715.5 and 170312.5 m3 year−1 and 3043.2 and 2689.4-ton km−2 y−1 for trap efficiencies of 70.1 and 80% calculated with two methods, respectively. The SSY has increased by about 50.3% to the minimum and 70.1% to the maximum indicating more degradation of the watershed in sixteen years. The gross storage capacity loss of the reservoir was about 75% which was 5.3 Mm3 in 1997 and reduced to 1.32 Mm3 in 2022 with an annual reduction of 2.9% in storage capacity. The reservoir will be filled up by sediment in 7 years if the incoming sediment remains the same in the future. These findings will serve as a call for action in the watershed and a foundation for managing the accumulated sedimentation in the Angereb reservoir and for developing sediment control and management strategies for similar reservoirs.

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Section: Introductionmentioning

confidence: 99%

Understanding sedimentation trends to enhance sustainable reservoir management in the Angereb reservoir, Upper Blue Nile Basin, Ethiopia

Tessema,

Zimale,

Kebedew

2024

Front. Water

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“…Reservoir sedimentation is a major issue all over the world since it decreased the reservoir's original capacity, affecting drinking water supply, agriculture, hydropower, flood management, and recreational activities. The sedimentation of reservoirs is unavoidable due to a lack of reservoir management measures such as reservoir sediment routing, periodic sediment flushing, and catchment management to decrease soil erosion, and it has steadily become a major issue for many countries across the world (Adongo et al 2021;Michalec and Cupak 2021).…”

Section: Introductionmentioning

confidence: 99%

“…To guide targeted management, it is vital to identify the key causes of erosion and other factors that increase siltation in reservoirs. For the prediction of storage losses and the reservoir's likely economic life, a progressive evaluation of reservoir siltation is required information (Adongo et al 2021;Moges et al 2018). It is critical to maintain the reservoir's storage capacity by estimating and analyzing sediment yield, deposition pattern, and sediment dispersion inside the reservoir.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of reservoir sedimentation using bathymetry survey: a case study on Adebra night storage reservoir, Ethiopia

et al. 2022

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Reservoir sedimentation is a serious challenge that reduces reservoir life. Because it decreases the initial capacity of the reservoir and has an impact on drinking water supply, irrigation, and hydropower activities. Inadequate land activities and poor management techniques cause soil erosion and reduce reservoir storage capacity. As a result, accurate sediment estimation was assist in the adoption of sustainable land-use activities and best management practices that lead to effective reservoir operations. The main objective of this study was to evaluate the rate of sedimentation and remaining capacity of Adebra night storage reservoir (NSR) using a bathymetric survey and Arc-GIS 10.8. A comparison of original and current reservoir capacity was used to evaluate the quantity of sediment deposition in the reservoir. The latter was developed using Arc-GIS 10.8 and a bathymetry survey that was used to develop the TIN surface and evaluate reservoir volume. The Adebra NSR reservoir capacity was decreased by the accumulation of sedimentation from 36,902 m3 in 2012 to 27,722 m3 in 2020. The results of this study showed that the Adebra night storage reservoir had lost on average 24.8% of its capacity due to sedimentation, during 8 years of operation. The average deposition rate of sedimentation in Adebra NSR was estimated to be 1147.5 m3/year, with a loss rate of 3.1% per year. The value of sedimentation rates found in live storage of the reservoir area was 1147.5 m3/year. At the current time, the expected life of the night storage reservoir was reduced due to a lack of proper soil conservation practices in the reservoir catchment areas. In general, the study finding showed that the capacity of NSR was reduced by the accumulation of sedimentation year to year throughout the design period. Therefore, to improve the capacity of NSR should be planning and implementing different techniques of sediment control and removal, depending on the estimation of sediment production from watersheds of inlets and outlets of reservoirs.

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Estimation of siltation in Tuirial dam: a spatio-temporal analysis using GIS technique and bathymetry survey

Lawmchullova,

Rao

2023

J. Sediment. Environ.

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Modelling and forecasting reservoir sedimentation of irrigation dams in the Guinea Savannah Ecological Zone of Ghana

Cited by 4 publications

References 15 publications

Understanding sedimentation trends to enhance sustainable reservoir management in the Angereb reservoir, Upper Blue Nile Basin, Ethiopia

Understanding sedimentation trends to enhance sustainable reservoir management in the Angereb reservoir, Upper Blue Nile Basin, Ethiopia

Evaluation of reservoir sedimentation using bathymetry survey: a case study on Adebra night storage reservoir, Ethiopia

Estimation of siltation in Tuirial dam: a spatio-temporal analysis using GIS technique and bathymetry survey

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