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Impact of reservoir construction on the sediment budget of a downstream-linked freshwater lake

Hanibal Lemma Gebrekidan, Jan Nyssen (UGent) , Jean Poesen, Habtamu Assaye, Enyew Adgo and Amaury Frankl (UGent)
(2024) HYDROLOGICAL SCIENCES JOURNAL. 69(7). p.833-843
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Abstract
We investigated the magnitude of reservoir sedimentation upstream and its sediment-shadow effect on a large downstream-linked lake, Lake Tana (Ethiopia). To better understand the reservoir-induced reductions of fluvial sediment downstream, sediment budgets for two scenarios were developed. The results indicated that reservoir sedimentation is extremely high, with annual storage capacity losses (1-4.2%) exceeding the global average. Consequently, unless mitigation measures are implemented, the reservoirs' dead storage volume will be filled with sediment in less than 42% of their designed life expectancy. The sediment-trapping conditions created by the reservoirs will also reduce sediment inflow from tributaries into the lake by 15-52%, overbank sedimentation on floodplains by 33-48%, and sediment deposition in Lake Tana by 16-54% annually. Overall, under the current environmental set-up, the ongoing and planned reservoir constructions could extend the expected useful lifetime of Lake Tana from 918 to 2022 years.
Keywords
sediment yield, reservoir sedimentation, sediment-shadow effect, Lake Tana, Ethiopia, BLUE NILE BASIN, NORTHERN ETHIOPIA, TRAP EFFICIENCY, TANA BASIN, YIELD, VARIABILITY, DAMS, CONSERVATION, FLOODPLAIN, HIGHLANDS

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Citation

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MLA
Gebrekidan, Hanibal Lemma, et al. “Impact of Reservoir Construction on the Sediment Budget of a Downstream-Linked Freshwater Lake.” HYDROLOGICAL SCIENCES JOURNAL, vol. 69, no. 7, 2024, pp. 833–43, doi:10.1080/02626667.2024.2337052.
APA
Gebrekidan, H. L., Nyssen, J., Poesen, J., Assaye, H., Adgo, E., & Frankl, A. (2024). Impact of reservoir construction on the sediment budget of a downstream-linked freshwater lake. HYDROLOGICAL SCIENCES JOURNAL, 69(7), 833–843. https://doi.org/10.1080/02626667.2024.2337052
Chicago author-date
Gebrekidan, Hanibal Lemma, Jan Nyssen, Jean Poesen, Habtamu Assaye, Enyew Adgo, and Amaury Frankl. 2024. “Impact of Reservoir Construction on the Sediment Budget of a Downstream-Linked Freshwater Lake.” HYDROLOGICAL SCIENCES JOURNAL 69 (7): 833–43. https://doi.org/10.1080/02626667.2024.2337052.
Chicago author-date (all authors)
Gebrekidan, Hanibal Lemma, Jan Nyssen, Jean Poesen, Habtamu Assaye, Enyew Adgo, and Amaury Frankl. 2024. “Impact of Reservoir Construction on the Sediment Budget of a Downstream-Linked Freshwater Lake.” HYDROLOGICAL SCIENCES JOURNAL 69 (7): 833–843. doi:10.1080/02626667.2024.2337052.
Vancouver
1.
Gebrekidan HL, Nyssen J, Poesen J, Assaye H, Adgo E, Frankl A. Impact of reservoir construction on the sediment budget of a downstream-linked freshwater lake. HYDROLOGICAL SCIENCES JOURNAL. 2024;69(7):833–43.
IEEE
[1]
H. L. Gebrekidan, J. Nyssen, J. Poesen, H. Assaye, E. Adgo, and A. Frankl, “Impact of reservoir construction on the sediment budget of a downstream-linked freshwater lake,” HYDROLOGICAL SCIENCES JOURNAL, vol. 69, no. 7, pp. 833–843, 2024.
@article{01HXY099D683SHPRQ2GR4QX1EZ,
  abstract     = {{We investigated the magnitude of reservoir sedimentation upstream and its sediment-shadow effect on a large downstream-linked lake, Lake Tana (Ethiopia). To better understand the reservoir-induced reductions of fluvial sediment downstream, sediment budgets for two scenarios were developed. The results indicated that reservoir sedimentation is extremely high, with annual storage capacity losses (1-4.2%) exceeding the global average. Consequently, unless mitigation measures are implemented, the reservoirs' dead storage volume will be filled with sediment in less than 42% of their designed life expectancy. The sediment-trapping conditions created by the reservoirs will also reduce sediment inflow from tributaries into the lake by 15-52%, overbank sedimentation on floodplains by 33-48%, and sediment deposition in Lake Tana by 16-54% annually. Overall, under the current environmental set-up, the ongoing and planned reservoir constructions could extend the expected useful lifetime of Lake Tana from 918 to 2022 years.}},
  author       = {{Gebrekidan, Hanibal Lemma and Nyssen, Jan and  Poesen, Jean and  Assaye, Habtamu and  Adgo, Enyew and Frankl, Amaury}},
  issn         = {{0262-6667}},
  journal      = {{HYDROLOGICAL SCIENCES JOURNAL}},
  keywords     = {{sediment yield,reservoir sedimentation,sediment-shadow effect,Lake Tana,Ethiopia,BLUE NILE BASIN,NORTHERN ETHIOPIA,TRAP EFFICIENCY,TANA BASIN,YIELD,VARIABILITY,DAMS,CONSERVATION,FLOODPLAIN,HIGHLANDS}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{833--843}},
  title        = {{Impact of reservoir construction on the sediment budget of a downstream-linked freshwater lake}},
  url          = {{http://doi.org/10.1080/02626667.2024.2337052}},
  volume       = {{69}},
  year         = {{2024}},
}
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