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Water balance variability in the confined Aba'ala limestone graben at the western margin of the Danakil depression, northern Ethiopia

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Abstract
Marginal grabens are major development corridors in Ethiopia, and need to be understood for proper assessment of the hydrological budget. This study investigates the water balance of the Aba'ala graben (553km(2)) in the period 2015-2016 under the challenge of data scarcity. We measured the rainfall and river discharge in order to analyse the runoff components of the graben. The rainfall volume in the Aba'ala graben showed erratic behaviour, which led to rapid flood runoff of the major river into the graben bottom. The average annual inflow and outflow of the graben bottom for the period 2015-2016 amounted to 364 and 254 hm(3), respectively. However, flood runoff and evapotranspiration had a marked effect on water availability. Water storage took 36% of the water inflow into the graben bottom. Sustainable water management could reduce the temporal variation of the water storage in Aba'ala graben.
Keywords
RIFT-VALLEY ESCARPMENT, BLUE NILE BASIN, SPATIOTEMPORAL RAINFALL, VARIABILITY, EAST-AFRICAN RIFT, RIVER-BASIN, LAKE TANA, INTEGRATED, ASSESSMENT, RESOURCES MANAGEMENT, SOCIO-HYDROLOGY, GROUNDWATER, streamflow, hydrology, evapotranspiration, Rift Valley, Afar, northern, Ethiopia

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Chicago
Gebregergs, Hailemariam Meaza, Amaury Frankl, Jean Poesen, Amanuel Zenebe, Veerle Van Eetvelde, Biadgilgn Demissie, Tesfaalem Ghebreyohannes Asfaha, Jozef Deckers, Dirk Raes, and Jan Nyssen. 2018. “Water Balance Variability in the Confined Aba’ala Limestone Graben at the Western Margin of the Danakil Depression, Northern Ethiopia.” Hydrological Sciences Journal-journal Des Sciences Hydrologiques 63 (6): 957–977.
APA
Gebregergs, H. M., Frankl, A., Poesen, J., Zenebe, A., Van Eetvelde, V., Demissie, B., Asfaha, T. G., et al. (2018). Water balance variability in the confined Aba’ala limestone graben at the western margin of the Danakil depression, northern Ethiopia. HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, 63(6), 957–977.
Vancouver
1.
Gebregergs HM, Frankl A, Poesen J, Zenebe A, Van Eetvelde V, Demissie B, et al. Water balance variability in the confined Aba’ala limestone graben at the western margin of the Danakil depression, northern Ethiopia. HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES. Abingdon: Taylor & Francis Ltd; 2018;63(6):957–77.
MLA
Gebregergs, Hailemariam Meaza, Amaury Frankl, Jean Poesen, et al. “Water Balance Variability in the Confined Aba’ala Limestone Graben at the Western Margin of the Danakil Depression, Northern Ethiopia.” HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES 63.6 (2018): 957–977. Print.
@article{8567838,
  abstract     = {Marginal grabens are major development corridors in Ethiopia, and need to be understood for proper assessment of the hydrological budget. This study investigates the water balance of the Aba'ala graben (553km(2)) in the period 2015-2016 under the challenge of data scarcity. We measured the rainfall and river discharge in order to analyse the runoff components of the graben. The rainfall volume in the Aba'ala graben showed erratic behaviour, which led to rapid flood runoff of the major river into the graben bottom. The average annual inflow and outflow of the graben bottom for the period 2015-2016 amounted to 364 and 254 hm(3), respectively. However, flood runoff and evapotranspiration had a marked effect on water availability. Water storage took 36\% of the water inflow into the graben bottom. Sustainable water management could reduce the temporal variation of the water storage in Aba'ala graben.},
  author       = {Gebregergs, Hailemariam Meaza and Frankl, Amaury and Poesen, Jean and Zenebe, Amanuel and Van Eetvelde, Veerle and Demissie, Biadgilgn and Asfaha, Tesfaalem Ghebreyohannes and Deckers, Jozef and Raes, Dirk and Nyssen, Jan},
  issn         = {0262-6667},
  journal      = {HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES},
  language     = {eng},
  number       = {6},
  pages        = {957--977},
  publisher    = {Taylor \& Francis Ltd},
  title        = {Water balance variability in the confined Aba'ala limestone graben at the western margin of the Danakil depression, northern Ethiopia},
  url          = {http://dx.doi.org/10.1080/02626667.2018.1466055},
  volume       = {63},
  year         = {2018},
}

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