A method for estimating the fresh water–salt water interface with hydraulic heads in a coastal aquifer and its application

Zhou, Xun

doi:10.1016/j.gsf.2011.02.003

Cited by 16 publications

(7 citation statements)

References 23 publications

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“…Due to this, dependence on groundwater is higher day after day because of the enormous population growth in coastal areas, [10] as they demand fresh water free of contaminants [11], knowing seasonal and special evolution of water in coast zones is useful for preventing seawater intrusion and to understand the vulnerability of a coastal environment [12]. As groundwater use has increased in coastal areas, so has the recognition that groundwater supplies are vulnerable to overuse and contamination.…”

Section: Introductionmentioning

confidence: 99%

Determining Water Salinity in a Shallow Aquifer and Its Vulnerability to Coastline Erosion

Peinado-Guevara¹,

Delgado‐Rodríguez²,

Herrera-Barrientos³

et al. 2017

Pol. J. Environ. Stud.

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In most coastal areas in Mexico, there is an increase in housing development and facilities for tourism, consequently resulting in a negative impact on the environment. Due to this, an awareness of the critical role of groundwater in sustaining coastal populations, economies, and ecosystems is growing. The coastal zone of Sinaloa State is classified as an area with a high presence of saline groundwater in Mexico. The present work was performed in the Las Glorias Beach, Guasave, Sinaloa, Mexico. The results of the analysis of 19 soil and groundwater samples indicate the predominance of sandy soil and a wide range of water salinity, from slightly saline to brine. An electromagnetic profiling (EMP) survey was performed at the study site showing a low apparent electrical conductivity zone parallel to the coastline as indicative of the possible presence of fresh and/or slightly saline water. Apparent electrical conductivity values were compared with electrical conductivity values measured in groundwater samples collected in wells, resulting in a positive linear correlation (R = 0.97). This linear relation is explained by a φ -ξ electromagnetic analytic model when 5.36 ≤ σ a ≤ 85.87 mS/cm. The linear relation was used to recalculate the apparent electrical conductivity values from EMP survey into electrical conductivity values of groundwater and, therefore, TDS values. The TDS map indicates the presence of a barrier of fresh/slightly saline groundwater parallel to the coastline that keeps a fragile balance that prevents the advance of saltwater intrusion from the sea of Cortés and from brine zones located in the northern part of the site. The advance of erosion in Las Glorias Beach exposes

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Section: Introductionmentioning

confidence: 99%

Determining Water Salinity in a Shallow Aquifer and Its Vulnerability to Coastline Erosion

Peinado-Guevara¹,

Delgado‐Rodríguez²,

Herrera-Barrientos³

et al. 2017

Pol. J. Environ. Stud.

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“…Lu et al, 2016 andZhou (2011), used analytical solutions for seawater-freshwater interface characterizations, to determine the lateral seawater intrusion zone, and to estimate the volume of seawater in coastal aquifers.…”

Section: Figure 1 Location Map Of the Ras El Hekma Area Northwestermentioning

confidence: 99%

Integrative management of saltwater intrusion in poorly-constrained semi-arid coastal aquifer at Ras El-Hekma, Northwestern Coast, Egypt

Eissa

Dreuzy

Parker

2018

Groundwater for Sustainable Development

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International audienceSaltwater intrusion is a major concern in coastal aquifers, particularly in arid and semiarid regions, where recharge is limited and groundwater withdrawal is the main source of potable water. In Ras El Hekma groundwater occurs in the Pleistocene aquifer as a thin lens of freshwater where groundwater quality is very sensitive to pumping stresses. High groundwater withdrawals from the Pleistocene aquifer deteriorate the groundwater quality along the coast due to upwelling of saltwater into the thin lens freshwater. The Pleistocene aquifer is poorly-constrained; the hydrological and geochemical records are sparse. Therefore, a simple analytical approach has been used in order to address local and regional groundwater management issues, for cases of data scarcity using little known and well defined parameters. The model assumes steady state flow as an initial condition in an isotropic and homogeneous medium, with a sharp interface between the freshwater and seawater wedge. The model combines the hydrogeological and geochemical characterization, adapted to the aquifer geometry, in order to provide global salt and freshwater balances to the Ras El Hekma scale site. The model shows progressive extension of the seawater intrusion zone (x-toe) upon increasing the groundwater withdrawals from 250 m3/day to an order of magnitude of this amount. The x-toe distance has been extended from 1700 to 5000 m from the tip of Ras El Hekma to inland. Such model could be applied to estimate the volume of the freshwater and seawater wedge along the coast as well as to predict the groundwater withdrawals under different pumping scenarios. Seawater intrusion, in the Ras El Hekma area, is caused by the unbalance between the pumping withdrawal rates and the natural recharge from precipitation. The model can be applied for similar hydrogeological systems, specifically, coastal aquifers located in semiarid to arid environments where limited aquifer data is available

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“…Hubungan air tawar (fresh water) dengan air asin (saline water) [2] Ketersediaan air tawar di kawasan pesisir mengakibatkan terjadinya eksplotasi air tawar yang berlebihan. Akibatnya terjadi intrusi air asin di wilayah pesisir [3][4][5][6][7]. Intrusi air asin akibat eksploitasi air tawar di wilayah pesisir untuk pulau kecil lebih rentan lagi dibandingkan pulau besar [8].…”

Section: Latar Belakangunclassified

Penentuan Kedalaman Interface pada Bentuklahan Lereng Gunungapi Bawah dan Bentuklahan Dataran Aluvial Kepesisiran di Pulau Ternate

Salam¹,

Sunarto²,

Santosa³

2018

Positron

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Telah dilakukan pengukuran interface menggunakan metode geolistrik 2D di wilayah pesisir Pulau Ternate. Penelitian ini dimaksudkan untuk menentukan keadaan interface dengan mengajukan asumsi sederhana yang berdasar pada prinsip trigonometri dasar. Pengukuran dilakukan di bagian barat sampai barat daya pada bentuklahan lereng gunungapi bawah dan bentuklahan dataran aluvial kepesisiran. Hasil pengukuran geolistrik pada keseluruhan lintasan menunjukkan, ketebalan air tawar pada bentuklahan lereng gunungapi bawah berkisar 7 - 13 m dengan nilai resistivitas antara 25,9 – 100 Ωm. Ketebalan air tawar pada bentuklahan dataran aluvial kepesisiran antara 15 m hingga kurang dari 20 m dengan nilai resistivitas antara 30 – 109 Ωm. Kedalaman interface pada bentuklahan lereng gunungapi bawah sekitar 13 m dari permukaan dengan kemiringan 77o, sedang kedalaman interface pada bentuklahan dataran aluvial kepesisiran sekitar 20 m dari permukaan dengan kemiringan 81o. Hasil pengukuran menunjukkan bahwa ketebalan air tawar di daerah pesisir bagian barat sampai baratdaya pada bentuklahan lereng gunungapi bawah lebih tipis dibandingkan dengan daerah pesisir bagian timur hingga tenggara pada bentuklahan dataran aluvial kepesisiran.

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A method for estimating the fresh water–salt water interface with hydraulic heads in a coastal aquifer and its application

Cited by 16 publications

References 23 publications

Determining Water Salinity in a Shallow Aquifer and Its Vulnerability to Coastline Erosion

Determining Water Salinity in a Shallow Aquifer and Its Vulnerability to Coastline Erosion

Integrative management of saltwater intrusion in poorly-constrained semi-arid coastal aquifer at Ras El-Hekma, Northwestern Coast, Egypt

Penentuan Kedalaman Interface pada Bentuklahan Lereng Gunungapi Bawah dan Bentuklahan Dataran Aluvial Kepesisiran di Pulau Ternate

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