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On the possibility for generic modeling of submarine groundwater discharge
KTH, Superseded Departments, Land and Water Resources Engineering.
KTH, Superseded Departments, Land and Water Resources Engineering.
2003 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 66, no 1-2, 171-186 p.Article in journal (Refereed) Published
Abstract [en]

We simulate large-scale dynamics of submarine groundwater discharge (SGD) in three different coastal aquifers on the Mediterranean Sea. We subject these aquifers to a wide range of different groundwater management conditions, leading to widely different net groundwater drainage from land to sea. The resulting SGD at steady-state is quantifiable and predictable by simple linearity in the net land-determined groundwater drainage, defined as total fresh water drainage minus groundwater extraction in the coastal aquifer system. This linearity appears to be general and independent of site-specific, variable and complex details of hydrogeology, aquifer hydraulics, streamlines and salinity transition zones in different coastal systems. Also independently of site-specifics, low SGD implies high seawater content due to seawater intruding into the aquifer and mixing with fresh groundwater within a wide salinity transition zone in the aquifer. Increasing SGD implies decreasing seawater content, decreased mixing between seawater and fresh groundwater and narrowing of the salinity transition zone of brackish groundwater in the aquifer.

Place, publisher, year, edition, pages
2003. Vol. 66, no 1-2, 171-186 p.
Keyword [en]
coastal aquifer, coastal zone, groundwater-seawater interactions, seawater intrusion, submarine groundwater discharge
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5143DOI: 10.1023/B:BIOG.0000006101.12076.10ISI: 000186894700010OAI: oai:DiVA.org:kth-5143DiVA: diva2:7941
Note
QC 20101012Available from: 2005-05-25 Created: 2005-05-25 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Groundwater-Seawater Interactions: Seawater Intrusion, Submarine Groundwater Discharge and Temporal Variability and Randomness Effects
Open this publication in new window or tab >>Groundwater-Seawater Interactions: Seawater Intrusion, Submarine Groundwater Discharge and Temporal Variability and Randomness Effects
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Fresh groundwater quality and availability in coastal areas is affected by seawater intrusion into coastal aquifers, and coastal water quality and ecosystem status may be significantly affected by groundwater pollutants that are transported into coastal waters by submarine groundwater dis-charge (SGD). This thesis uses an overall regional perspective for investigating: i) seawater intru-sion and its possible control in sustainable coastal groundwater management; ii) SGD and its relevant quantification as one interacting part among the diverse main regional pathways of freshwater and tracer/pollutant inputs from land to sea; and iii) the integrated system functioning of both i) and ii) as main components of the same coastal groundwater system.

Results show that intensive pumping rates may be maintained for a long time before major re-gional seawater intrusion problems are recognized by too high salinities in pumped groundwater. After such late recognition, pumping wells are no longer useful and a common strategy of mov-ing groundwater pumping further upstream from the coast only increases the extent of the salt-water intrusion zone into the aquifer. An alternative strategy may be to control seawater intrusion through artificial groundwater recharge, for instance by sufficiently treated wastewater, which may considerably reduce long-term trends of salinity increase in pumped groundwater, even for small artificial recharge rates compared to pumping rates. In general, account for natural spatial-temporal variability and randomness may be essential for relevant prediction of groundwater dynamics for management purposes. Spatial and temporal randomness effects, however, may not be additive, but rather largely overlapping, with either spatial or temporal randomness being the dominating part that must be accounted for in predictive groundwater dynamics calculations. Aquifer depth is identified as an important control parameter in this context, yielding much greater temporal randomness effects in shallow than in deep aquifers.

Combined simulation results suggest a simple, approximately linear regional relationship between total SGD and its hydrologically determined freshwater component. Tidal oscillation may signifi-cantly affect such linear dependence of steady-state SGD, but primarily for low SGD conditions. High SGD appears to depend mainly on a dominant freshwater component, which effectively counteracts density-driven flow of seawater into the aquifer and thus decreases also effects of sea-level oscillation on the seawater component of total SGD. Comparative analysis between different SGD estimation methods in different reported high-SGD regions of the world indicates possible anomalously large regional SGD estimation from tracer concentrations in coastal waters, by confusing different main pathways of groundwater flow and pollutant inputs to the sea.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. x, 21 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1019
Keyword
Hydraulic engineering, Seawater intrusion, submarine groundwater discharge, coastal groundwater management, coastal zone management, temporal variability, temporal randomness, Vattenteknik
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-222 (URN)91-7178-027-0 (ISBN)
Public defence
2005-06-01, sal D3, KTH, Lindstedtsvägen 5, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101012Available from: 2005-05-25 Created: 2005-05-25 Last updated: 2010-10-12Bibliographically approved

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