Identifying recharge areas for the upstream portion aquifers of Awash Basin, Ethiopia

The western and eastern flanks of Ethiopia's Awash and Abay Basins, respectively. Identifying recharge zones of the main aquifers in the Upper Awash Basin, which are water resources targeted for long-term sustainable use. In this work, lithohydrostratigraphic concepts with fracture density, hyd...

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Published in:Journal of hydrology. Regional studies 2024-08, Vol.54, p.101890, Article 101890
Main Authors: Tadesse, Ephrem, Azagegn, Tilahun, Alemayehu, Taye
Format: Article
Language:English
Subjects:
Aquifers
basalt
basins
deuterium
Ethiopia
groundwater
Groundwater chemistry
hydrogeochemistry
Part of the Upper Awash Basin
Recharge area
seepage
Stable isotopes
water supply
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Azagegn, Tilahun
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description The western and eastern flanks of Ethiopia's Awash and Abay Basins, respectively. Identifying recharge zones of the main aquifers in the Upper Awash Basin, which are water resources targeted for long-term sustainable use. In this work, lithohydrostratigraphic concepts with fracture density, hydrogeochemical and stable isotopic insights were applied using information from 94 water-supply wells, 188 geoelectrical resistivity, 124 hydrochemistry, and 81 stable isotopic data sets. The results illustrate that recharge of superficial deposits and Rift basalt aquifers is from modern precipitation and from nearby streams/rivers through fractures, which is exemplified by mixed CaHCO3 or CaMgHCO3 water types of low TDS (5), low RA (
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Identifying recharge zones of the main aquifers in the Upper Awash Basin, which are water resources targeted for long-term sustainable use. In this work, lithohydrostratigraphic concepts with fracture density, hydrogeochemical and stable isotopic insights were applied using information from 94 water-supply wells, 188 geoelectrical resistivity, 124 hydrochemistry, and 81 stable isotopic data sets. The results illustrate that recharge of superficial deposits and Rift basalt aquifers is from modern precipitation and from nearby streams/rivers through fractures, which is exemplified by mixed CaHCO3 or CaMgHCO3 water types of low TDS (<200 mg/l), high Ca/Na ratio (>5), low RA (<2.0), enriched isotopic signature, and high deuterium excess (13.3). Seepage from the overlying aquifers, as well as direct precipitation in locations where the unit is exposed, form the mechanisms of recharge for fractured ignimbrite aquifer. The highland and transition areas are dominantly the recharge areas for the regional scoriaceous basalt aquifer. These areas have high fracture density (0.96<FD<3.0 km/km2), mineralized NaHCO3 water type, high TDS (>468 mg/l), low Ca/Na ratio (<1), high RA (>2.0), highly depleted isotopic signals, and low deuterium excess (<11) relative to the Local Meteoric Water Line. The results also reveal groundwater flux from the adjacent eastern flank of Abay Basin. [Display omitted] •Meteoric water and surface water are recharge sources for shallow aquifer system.•Leakage from the overlying formations and direct recharge where it exposed are recharge zones for middle aquifer.•The recharge zone for deep confined aquifer system is plateau and zone beyond it.•The results show the inter-basin groundwater transfer for deep and middle aquifers.]]></description><identifier>ISSN: 2214-5818</identifier><identifier>EISSN: 2214-5818</identifier><identifier>DOI: 10.1016/j.ejrh.2024.101890</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Aquifers ; basalt ; basins ; deuterium ; Ethiopia ; groundwater ; Groundwater chemistry ; hydrogeochemistry ; Part of the Upper Awash Basin ; Recharge area ; seepage ; Stable isotopes ; water supply</subject><ispartof>Journal of hydrology. 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Regional studies</title><description><![CDATA[The western and eastern flanks of Ethiopia's Awash and Abay Basins, respectively. Identifying recharge zones of the main aquifers in the Upper Awash Basin, which are water resources targeted for long-term sustainable use. In this work, lithohydrostratigraphic concepts with fracture density, hydrogeochemical and stable isotopic insights were applied using information from 94 water-supply wells, 188 geoelectrical resistivity, 124 hydrochemistry, and 81 stable isotopic data sets. The results illustrate that recharge of superficial deposits and Rift basalt aquifers is from modern precipitation and from nearby streams/rivers through fractures, which is exemplified by mixed CaHCO3 or CaMgHCO3 water types of low TDS (<200 mg/l), high Ca/Na ratio (>5), low RA (<2.0), enriched isotopic signature, and high deuterium excess (13.3). Seepage from the overlying aquifers, as well as direct precipitation in locations where the unit is exposed, form the mechanisms of recharge for fractured ignimbrite aquifer. The highland and transition areas are dominantly the recharge areas for the regional scoriaceous basalt aquifer. These areas have high fracture density (0.96<FD<3.0 km/km2), mineralized NaHCO3 water type, high TDS (>468 mg/l), low Ca/Na ratio (<1), high RA (>2.0), highly depleted isotopic signals, and low deuterium excess (<11) relative to the Local Meteoric Water Line. The results also reveal groundwater flux from the adjacent eastern flank of Abay Basin. [Display omitted] •Meteoric water and surface water are recharge sources for shallow aquifer system.•Leakage from the overlying formations and direct recharge where it exposed are recharge zones for middle aquifer.•The recharge zone for deep confined aquifer system is plateau and zone beyond it.•The results show the inter-basin groundwater transfer for deep and middle aquifers.]]></description><subject>Aquifers</subject><subject>basalt</subject><subject>basins</subject><subject>deuterium</subject><subject>Ethiopia</subject><subject>groundwater</subject><subject>Groundwater chemistry</subject><subject>hydrogeochemistry</subject><subject>Part of the Upper Awash Basin</subject><subject>Recharge area</subject><subject>seepage</subject><subject>Stable isotopes</subject><subject>water supply</subject><issn>2214-5818</issn><issn>2214-5818</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>DOA</sourceid><recordid>eNp9UcFO3DAQjVArgYAf4ORjD92tY3sTW-oFEJSVkLjA2ZraMxtHu3Gws1T8PV5SIU6cZvT03puneVV1UfNlzevmV7_EPnVLwYU6ANrwo-pEiFotVrrW3z7tx9V5zj3nhdRq0_CT6mntcZgCvYZhwxK6DtIGGSSEzCgmNnXI9mOeCrBjY0xTiAOD530gTJlFYpf_IHfsCnIYfrKbqQtxDHBWfSfYZjz_P0-rp9ubx-u7xf3Dn_X15f3CCc2nhRKt8ZKvFGopjdRakiBjVgiqIfQCuSZHjTdeA3gptXek25Y7RVIo0vK0Ws--PkJvxxR2kF5thGDfgZg2Fkpkt0UrOZGXDbhyS_11yhhAo1tqhPatJFe8fsxeY4rPe8yT3YXscLuFAeM-W1mvZKNkzdtCFTPVpZhzQvo4XXN7qMT29lCJPVRi50qK6PcswvKQl4DJZhdwcOhD-ftUEoev5G9mX5SM</recordid><startdate>20240801</startdate><enddate>20240801</enddate><creator>Tadesse, Ephrem</creator><creator>Azagegn, Tilahun</creator><creator>Alemayehu, Taye</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>6I.</scope><scope>AAFTH</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7S9</scope><scope>L.6</scope><scope>DOA</scope></search><sort><creationdate>20240801</creationdate><title>Identifying recharge areas for the upstream portion aquifers of Awash Basin, Ethiopia</title><author>Tadesse, Ephrem ; Azagegn, Tilahun ; Alemayehu, Taye</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c280t-4279d3054e83393883f2f995ea46fed2e08fcf6d9d8aad338dcf8770c4f324f83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Aquifers</topic><topic>basalt</topic><topic>basins</topic><topic>deuterium</topic><topic>Ethiopia</topic><topic>groundwater</topic><topic>Groundwater chemistry</topic><topic>hydrogeochemistry</topic><topic>Part of the Upper Awash Basin</topic><topic>Recharge area</topic><topic>seepage</topic><topic>Stable isotopes</topic><topic>water supply</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Tadesse, Ephrem</creatorcontrib><creatorcontrib>Azagegn, Tilahun</creatorcontrib><creatorcontrib>Alemayehu, Taye</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>CrossRef</collection><collection>AGRICOLA</collection><collection>AGRICOLA - Academic</collection><collection>DOAJ Directory of Open Access Journals</collection><jtitle>Journal of hydrology. Regional studies</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tadesse, Ephrem</au><au>Azagegn, Tilahun</au><au>Alemayehu, Taye</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Identifying recharge areas for the upstream portion aquifers of Awash Basin, Ethiopia</atitle><jtitle>Journal of hydrology. Regional studies</jtitle><date>2024-08-01</date><risdate>2024</risdate><volume>54</volume><spage>101890</spage><pages>101890-</pages><artnum>101890</artnum><issn>2214-5818</issn><eissn>2214-5818</eissn><abstract><![CDATA[The western and eastern flanks of Ethiopia's Awash and Abay Basins, respectively. Identifying recharge zones of the main aquifers in the Upper Awash Basin, which are water resources targeted for long-term sustainable use. In this work, lithohydrostratigraphic concepts with fracture density, hydrogeochemical and stable isotopic insights were applied using information from 94 water-supply wells, 188 geoelectrical resistivity, 124 hydrochemistry, and 81 stable isotopic data sets. The results illustrate that recharge of superficial deposits and Rift basalt aquifers is from modern precipitation and from nearby streams/rivers through fractures, which is exemplified by mixed CaHCO3 or CaMgHCO3 water types of low TDS (<200 mg/l), high Ca/Na ratio (>5), low RA (<2.0), enriched isotopic signature, and high deuterium excess (13.3). Seepage from the overlying aquifers, as well as direct precipitation in locations where the unit is exposed, form the mechanisms of recharge for fractured ignimbrite aquifer. The highland and transition areas are dominantly the recharge areas for the regional scoriaceous basalt aquifer. These areas have high fracture density (0.96<FD<3.0 km/km2), mineralized NaHCO3 water type, high TDS (>468 mg/l), low Ca/Na ratio (<1), high RA (>2.0), highly depleted isotopic signals, and low deuterium excess (<11) relative to the Local Meteoric Water Line. The results also reveal groundwater flux from the adjacent eastern flank of Abay Basin. [Display omitted] •Meteoric water and surface water are recharge sources for shallow aquifer system.•Leakage from the overlying formations and direct recharge where it exposed are recharge zones for middle aquifer.•The recharge zone for deep confined aquifer system is plateau and zone beyond it.•The results show the inter-basin groundwater transfer for deep and middle aquifers.]]></abstract><pub>Elsevier B.V</pub><doi>10.1016/j.ejrh.2024.101890</doi><oa>free_for_read</oa></addata></record>
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subjects Aquifers
basalt
basins
deuterium
Ethiopia
groundwater
Groundwater chemistry
hydrogeochemistry
Part of the Upper Awash Basin
Recharge area
seepage
Stable isotopes
water supply
title Identifying recharge areas for the upstream portion aquifers of Awash Basin, Ethiopia
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