Groundwater modeling in data scarce aquifers: The case of Gilgel-Abay, Upper Blue Nile, Ethiopia

Khadim, Fahad Khan; Dokou, Zoi; Lazin, Rehenuma; Moges, Semu Ayalew; Bagtzoglou, Amvrossios C.; Anagnostou, Emmanouil N.

doi:10.1016/j.jhydrol.2020.125214

Cited by 31 publications

(25 citation statements)

References 61 publications

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“…However, the water management sector could not stay productive yet due to the temporal and spatial variation, the reduction in intensity, and shift in rainfall season [75]. The potential of groundwater development and climate change adaptation is still quite under-investigated [26]. The potential is not always accurately described, as groundwater recharge for the region lacks evaluating tools and proper knowledge on how the groundwater budget behaves [76,77].…”

Section: Groundwater Potentialmentioning

confidence: 99%

“…Description of peer-reviewed published research articles indicated in Table 2 emphasized estimating groundwater flow dynamics and recharge of aquifers applying the following applications. The Newton-Raphson formulation for modular finite-difference groundwater flow (MODFLOW) was applied to evaluate groundwater flow dynamics [9,26,33,72,95,100]. The model predictions reveal that aquifers increase withdrawal and decrease recharge.…”

Section: Groundwater Rechargementioning

confidence: 99%

“…Ethiopia is heavily dependent on groundwater for drinking, livestock production, and industries. More than 80% of the water supply comes from aquifers [26,27]. Groundwater is a renewable crucial water supply for the great majority of the population in different regions [28].…”

Section: Introductionmentioning

confidence: 99%

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Challenges and Prospects of Advancing Groundwater Research in Ethiopian Aquifers: A Review

et al. 2021

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Groundwater is a strategic resource in all climatic regions of Ethiopia, contributing about 80% of the domestic supply of urban and rural populations. However, little research has been available compared with extensive geographical coverage and increasing population growth rates. Hence, the present study aimed to review published groundwater research of Ethiopian aquifers to realize potential research challenges and suggest future research directions. We focused on groundwater potential, recharge process, and qualities. The total potential groundwater of the country ranges from 2.5 to 47 billion cubic meters. The study depicted that the mean annual recharge estimate varies from 24.9 mm to 457 mm at catchments scales. However, the overall country was about 39.1 mm. The study found a need for a detailed investigation of different factors susceptible to groundwater pollution, as some of the evaluations indicated exceeding acceptable standards. This study observed that the main challenge was the lack of data and convergence research trends. Henceforth, future research in different climate regions should focus on multifaceted technical and stakeholder settings. This study gives the insight to integrate palatable research findings with the national policy and decision-making process to enhance the sustainability of groundwater resources significantly.

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Section: Groundwater Potentialmentioning

confidence: 99%

Section: Groundwater Rechargementioning

confidence: 99%

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Challenges and Prospects of Advancing Groundwater Research in Ethiopian Aquifers: A Review

et al. 2021

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“…The GW model is a fine-resolution, numerical groundwater model developed using the MODFLOW-NWT program, which employs the Newton-Raphson formulation for unconfined subsurface flow conditions. The model entailed the MODFLOW Unsaturated Zone Flow package ( [69]) to emphasize vadose zone flow simulations, and comprised four vertical layers (aquifers), namely, (a) a 6 m top soil layer underlaid by (b) a gravel-dominated fractured basalt layer of 15 m, over (c) another fractured basalt layer of approximately 200 m, succeeded by (d) a 4000 m layer of sedimentary rocks ( [61,70]). The horizontal spatial resolution was 200 m, while we used a temporal scale of 12 h, for the time period between January 2008 and August 2019, in transient conditions.…”

Section: Estimation Of Electricity Demand and Irrigation Water Needsmentioning

confidence: 99%

A Comprehensive Approach to the Design of a Renewable Energy Microgrid for Rural Ethiopia: The Technical and Social Perspectives

et al. 2021

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In view of Ethiopia’s significant renewable energy (RE) potential and the dynamic interactions among the components of the Water–Energy–Food (WEF) Nexus, we attempted to incorporate solar and small-scale hydropower into the optimal design of an environmentally friendly microgrid with the primary goal of ensuring the sustainability of irrigation water pumping, while taking advantage of existing infrastructure in various small administrative units (kebele). Any additional generated energy would be made available to the community for other needs, such as lighting and cooking, to support health and food security and improve the general quality of life. The novelty of the study stems from the utilization of in situ social data, retrieved during fieldwork interviews conducted in the kebele of interest, to ascertain the actual needs and habits of the local people. Based on these combined efforts, we were able to formulate a realistic energy demand plan for climatic conditions typical of Sub-Saharan Africa agricultural communities and analyze four different scenarios of the microgrid’s potential functionality and capital cost, given different tolerance levels of scheduled outages. We demonstrated that the RE-based microgrid would be socially and environmentally beneficial and its capital cost sensitive to the incorporation of individual or communal machines and appliances. Ultimately, the social impact investigation revealed the design would be welcomed by the local community, whose members already implement tailor-made solutions to support their agricultural activities. Finally, we argue that extended educational programs and unambiguous policies should be in place before any implementation to ensure the venture’s sustainability and functionality.

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“…They provided a comprehensive review of citizen science and crowd sourced data collection focusing on the role of citizen science in generating a plethora of scientific data. Khadim et al (2020) used citizen science to complement in-situ data scarcity in the context of groundwater management in the Gilgel-Abay region, Ethiopia. They consider the collections of locally trained high school students and farmers to be verified by faculty experts.…”

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confidence: 99%

Soil moisture data using citizen science technology cross-validated by satellite data

Karamouz

Ebrahimi

Ghomlaghi

2021

Journal of Hydroinformatics

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Soil moisture represents many attributes of the geo-hydrological cycle and the climate system. Citizen science through social media as an emerging tool could be utilized to collect soil moisture data. A pilot study area was selected in Shahriar, Iran. A user interface and a sampling process (use of citizen science by subscribers) were designed to analyze the subjective and gravimetric soil moisture data. Furthermore, explanatory moisture condition (EMC), a new initiative to consider land use in soil moisture information from vegetation cover, was evaluated. A statistical artificial neural network was used for quantifying subjective data, and soil moisture layouts were produced by utilizing the ordinary kriging (OK) method. For cross-validating, the land surface temperature data from the MODIS satellite were retrieved. A platform for the region with 200 m grids resolution to collect daily soil moisture at eight ungauged stations is proposed to utilize subjective data from the subscribers and cross-validated with satellite data. A virtual station at the centroid of the pervious part of the study area was selected as a reference station for data collection daily or weekly to generate soil moisture time series. The results showed a high potential of utilizing satellite and citizen science data for real-time estimation of scarce soil moisture data in developing regions.

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Groundwater modeling in data scarce aquifers: The case of Gilgel-Abay, Upper Blue Nile, Ethiopia

Cited by 31 publications

References 61 publications

Challenges and Prospects of Advancing Groundwater Research in Ethiopian Aquifers: A Review

Challenges and Prospects of Advancing Groundwater Research in Ethiopian Aquifers: A Review

A Comprehensive Approach to the Design of a Renewable Energy Microgrid for Rural Ethiopia: The Technical and Social Perspectives

Soil moisture data using citizen science technology cross-validated by satellite data

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