Submarine groundwater discharge: Effects of hydrogeology and of near shore surface water bodies

Kaleris, Vassilios

doi:10.1016/j.jhydrol.2005.10.008

Cited by 40 publications

(32 citation statements)

References 20 publications

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“…Previously , we used dispersivities of 0.25 (longitudinal) and 0.05 (transversal), which comply with reported macro dispersivities for aquifers (Gelhar et al, 1992;Kaleris, 2006;Kaleris et al, 2002). The value of the dispersivities that follows from Fiori and Dagan (2000) would easily be one (or more) order(s) of magnitude smaller.…”

Section: Appendix a Mixingmentioning

confidence: 84%

Response to recharge variation of thin rainwater lenses and their mixing zone with underlying saline groundwater

Eeman

Zee

Leijnse

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. In coastal zones with saline groundwater, fresh groundwater lenses may form due to infiltration of rain water. The thickness of both the lens and the mixing zone, determines fresh water availability for plant growth. Due to recharge variation, the thickness of the lens and the mixing zone are not constant, which may adversely affect agricultural and natural vegetation if saline water reaches the root zone during the growing season. In this paper, we study the response of thin lenses and their mixing zone to variation of recharge. The recharge is varied using sinusoids with a range of amplitudes and frequencies. We vary lens characteristics by varying the Rayleigh number and Mass flux ratio of saline and fresh water, as these dominantly influence the thickness of thin lenses and their mixing zone. Numerical results show a linear relation between the normalised lens volume and the main lens and recharge characteristics, enabling an empirical approximation of the variation of lens thickness. Increase of the recharge amplitude causes increase and the increase of recharge frequency causes a decrease in the variation of lens thickness. The average lens thickness is not significantly influenced by these variations in recharge, contrary to the mixing zone thickness. The mixing zone thickness is compared to that of a Fickian mixing regime. A simple relation between the travelled distance of the centre of the mixing zone position due to variations in recharge and the mixing zone thickness is shown to be valid for both a sinusoidal recharge variation and actual records of daily recharge data. Starting from a step response function, convolution can be used to determine the effect of variable recharge in time. For a sinusoidal curve, we can determine delay of lens movement compared to the recharge curve as well as the lens amplitude, derived from the convolution integral. Together the proposed equations provide us with a first order approximation of lens characteristics using basic lens and recharge parameters without the use of numerical models. This enables the assessment of the vulnerability of any thin fresh water lens on saline, upward seeping groundwater to salinity stress in the root zone.

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Section: Appendix a Mixingmentioning

confidence: 84%

Response to recharge variation of thin rainwater lenses and their mixing zone with underlying saline groundwater

Eeman

Zee

Leijnse

et al. 2012

Hydrol. Earth Syst. Sci.

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“…2002 ), a także procesy i efekty wymiany makro-i mikroskładników pomiędzy osadami jeziornymi a wodą naddenną w jeziorze ( Engstrom, Swain 1986;Rainey i in. 2000;Kaleris 2006 ). Na temat zasilania jezior poprzez wypływy wód podziemnych pisał także Meyboom ( 1967 ), który prowadził badania dla obszarów młodoglacjalnych zachodniej Kanady.…”

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Wypływy wód podziemnych w dnach mis jeziornych na przykładzie Jeziora Raduńskiego Górnego (Pojezierze Kaszubskie)

Cieśliński

Piekarz

2017

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: The aim of the study was to locate and describe groundwater outflows in a selected lake basin. The second aim was to measure spring discharge and measure physical characteristics of the studied waters ( temperature, conductivity ). The time scope of the work comprised the period from January 2011 to September 2012. The spatial scope of the work included the area of Lake Raduńskie Górne located in the Kashubian Lake District in northern Poland. The study consisted mostly of fieldwork and reviewing archived materials. Four groundwater outflows were located in the course of the study. Their total discharge was 4.6 l·s -1 and ranged between 0.5 and 2.5 l·s . This value is comparable to that for other lakes in the world. In effect, Lake Raduńskie Górne receives about 0.15% of its water from under-lake springs. This is a minute value in comparison with the lake's total groundwater recharge ( 97 mln m 3 per year ). However, it must be assumed that the actual number of under-lake springs is many times greater than that identified in the course of this study, which means that the share of water supplied in this manner is likely much higher and its effect on water chemistry and water levels in the lake is also likely much more pronounced.

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“…Whereas many of these factors can be measured, dispersivities remain difficult to quantify. The values of dispersivities proposed in the literature range from 0.1-1 mm (Fiori et al 2000) to meters (Kaleris et al, 2002 andKaleris, 2006) or even larger (Gelhar et al,1992). This large range is caused by differences between pore scale dispersion and macro-or mega-dispersion.…”

Section: Qualitative Description Of the Problemmentioning

confidence: 96%

“…In Chapter 1 we used dispersivities of 0.25 (longitudinal) and 0.05 (transversal), which comply with reported macro dispersivities for aquifers (Gelhar, 1992;Kaleris, 2006;Kaleris, 2002). The value of the dispersivities that follows from Fiori and Dagan (2000) would easily be one (or more) order(s) of magnitude smaller.…”

Section: Mixingmentioning

confidence: 96%

“…In their work, Paster and Dagan (2008) assumed small pore scale transversal dispersivities, and that assumption justified their boundary layer approach. The dispersivities used by Kaleris et al (2002) and Kaleris (2006) are intended to represent the combination of pore scale dispersion and macro dispersion. They are related to the length scale of the flow domain, in view of observations by Gelhar et al (1992).…”

Section: Qualitative Description Of the Problemmentioning

confidence: 99%

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Dynamics of rainwater lenses on upward seeping saline groundwater

Eeman¹

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Submarine groundwater discharge: Effects of hydrogeology and of near shore surface water bodies

Cited by 40 publications

References 20 publications

Response to recharge variation of thin rainwater lenses and their mixing zone with underlying saline groundwater

Response to recharge variation of thin rainwater lenses and their mixing zone with underlying saline groundwater

Wypływy wód podziemnych w dnach mis jeziornych na przykładzie Jeziora Raduńskiego Górnego (Pojezierze Kaszubskie)

Dynamics of rainwater lenses on upward seeping saline groundwater

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