Geological Characteristics of Shallow Groundwater Aquifer and its Relation to Hydrochemical Features and Bacteriological Pollutants in Siwa Oasis, Egypt

Leakage of stored CO2 from a designated deep reservoir could contaminate overlying shallow potable aquifers by dissolution of arsenic-bearing minerals. To elucidate CO2 leakage-induced arsenic contamination, 2D multispecies reactive transport models were developed and CO2 leakage processes were simulated in the shallow groundwater aquifer. Throughout a series of numerical simulations, it was revealed that the movement of leaked CO2 was primarily governed by local flow fields within the shallow potable aquifer. The induced low-pH plume caused dissolution of aquifer minerals and sequentially increased permeabilities of the aquifer; in particular, the most drastic increase in permeability appeared at the rear margin of CO2 plume where two different types of groundwater mixed. The distribution of total arsenic (∑As) plume was similar to the one for the arsenopyrite dissolution. The breakthrough curve of ∑As monitored at the municipal well was utilized to quantify the human health risk. In addition, sensitivity studies were conducted with different sorption rates of arsenic species, CO2 leakage rates, and horizontal permeability in the aquifer. In conclusion, the human health risk was influenced by the shape of ∑As plume, which was, in turn, affected by the characteristics of CO2 plume behavior such as horizontal permeability and CO2 leakage rate.

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The saline Interface of a Shallow Unconfined Aquifer, Rangitikei Delta

10.26686/wgtn.16945810.v1 ◽

2021 ◽

Author(s):

◽

Desiree S A Craig

Keyword(s):

Salt Marsh ◽

River Estuary ◽

Shallow Groundwater ◽

Cumulative Effect ◽

High Volume ◽

Unconfined Aquifer ◽

Saline Intrusion ◽

Groundwater System ◽

The North ◽

Groundwater Aquifer

<p>The coastal communities of Tangimoana and Scott's Ferry have a long history of using shallow groundwater bores. The cumulative effect of pumping over decades could influence the saline interface given the close proximity of the communities to the seashore and river estuary. It is important to quantify the effects of pumping on both the shallow groundwater system and the dynamics of the saline interface. This is necessary to protect the groundwater system against saline intrusion especially given the increasing number of high volume groundwater consents to support dairying. Resistivity soundings and traverses, coupled with chemical analyses of groundwater samples, were found to be an effective method for defining the saline interface of the shallow groundwater aquifer under the Rangitikei delta. The saline interface extends from the salt marsh to beneath the farmland north of Tangimoana. The interface is a zone of diffusion with freshwater and brackish water mixing from the estuary. The interface is currently located on the outskirts of Tangimoana, and it is likely to extend beneath the township. The infiltration of brackish surface waters into sediments of the salt marsh form a surficial mixing zone that decreases with distance from the salt marsh. There is no indication of salinity in the area to the north of the Rangitikei delta. This area is most at risk of contamination from saline intrusion because of high volume groundwater abstractions, even though these abstractions are from deeper aquifers. The shallow groundwater beneath Tangimoana showed high concentrations of Ca and HCO3 ions. This may be a result of carbonate dissolution, which can occur when saline and freshwater mix. This creates groundwater that is under-saturated with calcium. The mixing water dissolves carbonates and increases the concentrations of Ca and HCO3. The major source of sodium and chloride was likely rainwater with evaporated solutes from seawater. The saline interface near Tangimoana appears to be relatively static, but the estuary and salt marsh are areas of low relief. There are preferential flows paths across the salt marsh to the farmland. These factors make the shallow groundwater in the Rangitikei delta vulnerable to saline intrusion.</p>

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Hydrogeology Potential of Hargorejo Area Kokap Subdistrict West Progo Regency

Angkasa: Jurnal Ilmiah Bidang Teknologi ◽

10.28989/angkasa.v12i2.772 ◽

2020 ◽

Vol 12 (2) ◽

Author(s):

T. Listyani R.A. ◽

Dianto Isnawan ◽

Ign. Adi Prabowo

Keyword(s):

Groundwater Flow ◽

Ph Value ◽

Shallow Groundwater ◽

Research Area ◽

The West ◽

Basin Boundary ◽

Geological Characteristics ◽

Dug Wells ◽

Groundwater Basin ◽

Basin Region

This research is a hydrogeological survey activity with the aim to determine the geological characteristics of groundwater in the Hargorejo area, Kokap Sub-district, West Progo. The study wants to know about the pattern of groundwater flow and water quality in the area. The northern part of the research area is included in the non-groundwater basin region of the West Progo Dome, while the southern part is included in Wates Groundwater Basin. Method of research is a field hydrogeological survey, to obtain geological and groundwater data. Groundwater flow pattern and quality analyses are based on groundwater data and pH, TDS and EC values. Groundwater can be obtained from springs or dug wells, with relatively shallow groundwater tables. The pattern of groundwater flow is generally to the south, with the H4 / H5 basin boundary type. Groundwater quality is quite good, with a pH value of 6.2 -7; TDS 191 - 558 ppm, and EC ranges from 279-783 µS / cm.

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Vulnerability mapping of shallow groundwater aquifer using SINTACS model in the Jordan Valley area, Jordan

Environmental Geology ◽

10.1007/s00254-006-0239-8 ◽

2006 ◽

Vol 50 (5) ◽

pp. 651-667 ◽

Cited By ~ 24

Author(s):

Mustafa Al Kuisi ◽

Ali El-Naqa ◽

Nezar Hammouri

Keyword(s):

Shallow Groundwater ◽

Vulnerability Mapping ◽

Jordan Valley ◽

Groundwater Aquifer ◽

Valley Area

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PEMETAAN AKUIFER AIRTANAH DI WILAYAH KAMPUS UNSRAT MANADO DENGAN MENGGUNAKAN METODE GEOLISTRIK TAHANAN JENIS

JURNAL ILMIAH SAINS ◽

10.35799/jis.15.1.2015.6771 ◽

2015 ◽

Vol 15 (1) ◽

pp. 20

Author(s):

Sweetny Steria Sulu ◽

As’ari As’ari ◽

Seni Herlina Juwita Tongkukut

Keyword(s):

Shallow Groundwater ◽

Electric Resistivity ◽

Subsurface Structure ◽

Resistivity Method ◽

Groundwater Aquifer ◽

The Difference

PEMETAAN AKUIFER AIRTANAH DI WILAYAH KAMPUS UNSRAT MANADO DENGAN MENGGUNAKAN METODE GEOLISTRIK TAHANAN JENISABSTRAK Penelitian ini bertujuan untuk memetakan keberadaan akuifer air tanah di Jl. Kampus Selatan Kecamatan Sario Kota Manado berdasarkan resistivitas batuan bawah permukaan hasil eksplorasi geofisika dengan metode geolistrik tahanan jenis. Penelitian ini terdiri dari 18 titik sounding yang terbagi dalam 4 lintasan dimana setiap lintasan dibuat model struktur lapisan tanah dibawah permukaan. Kondisi lapisan akuifer airtanah ini dapat dieksplorasi dengan metode geofisika yang dapat digunakan untuk menyelidiki struktur bawah permukaan berdasarkan perbedaan resistivitas batuan. Hasil eksplorasi ini kemudian diolah dengan menggunakan software IP2WIN untuk melihat data lapisan tanah berdasarkan nilai resistivitasnya (2D) dan pesebaran titik – titik terdapatnya akuifer airtanah. Berdasarkan model struktur lapisan tanah di bawah permukaan ini diperoleh lapisan akuifer airtanah yang berupa akuifer airtanah dangkal dengan nilai resistivitas ρ 14,5 Ωm. Lapisan akuifer airtanah yang berupa akuifer airtanah dangkal permukaan dengan kedalaman 2 meter pada titik sounding 3. Kedalaman 3 meter pada setiap titik sounding. Terdapat akuifer airtanah dangkal dalam pada kedalaman 10 meter dititik sounding 15. Kata kunci : Akuifer airtanah, geolistrik tahanan jenis, software IP2WIN, struktur lapisan tanah. THE MAPPING OF GROUNDWATER AQUIFER IN UNSRAT (MANADO BY USING THE GEO ELECTRIC OF RESISTIVITY METHOD ABSTRACT This research is intebded to map the existence of groundwater aquifer at Jl. Kampus Selatan Kecamatan Sario in Manadi city, based on resistivity of subsurface rock as exploration result is of geophysics by geo electric methode . The research consist of 18 sounding points which divided in 4 lines, that a model of this aquifer can be explored by geophysics method. This method can be use to see into subsurface structure based on the difference of rocks resistivity. This exploration result then proceeded by using IP2WIN software to see ground layers data based on resistivity values (2D) and the spread of the points in which the groundwater aquifer exists. Based on this subsurface ground layers structure, the groundwater aquifer layer of shallow groundwater is acquired with ρ 14,5 Ωm resistivity values. This can be found on sounding point 3 at depth of 2m. Aquifer with dept of 10m found in sounding point 15. Keyword : groundwater aquifer, geo electric resistivity, IP2WIN software, ground layers structure.

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CASE HISTORY: OPEC IN SOUTHERN IDAHO

International Oil Spill Conference Proceedings ◽

10.7901/2169-3358-1983-1-389 ◽

1983 ◽

Vol 1983 (1) ◽

pp. 389-391

Author(s):

James C. Willmann

Keyword(s):

Case History ◽

Environmental Protection Agency ◽

Oil Pollution ◽

Shallow Groundwater ◽

Protection Agency ◽

Groundwater Aquifer ◽

Pollution Problem ◽

Recovery System ◽

The City ◽

The U.S

ABSTRACT The City of Nampa, Idaho, has had an oil pollution problem for about eight years. Oil was found in basements of downtown buildings, in sewers, and occasionally in a local stream. Numerous efforts to locate the source failed. The U.S. Environmental Protection Agency assisted the city in locating the source and establishing a recovery system which continually removes oil from the shallow groundwater aquifer.

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