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Earth’s rotation induces vertical ground water flow
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Arkitektur och vatten.ORCID-id: 0000-0001-7144-9778
2007 (engelsk)Konferansepaper, Oral presentation only (Annet vitenskapelig)
Abstract [en]

It is well established that the Coriolis Force deflects wind and water currents. However, its influence on groundwater flow is neglected. Earth’s rotation causes inertia circles in groundwater that create vortices ending up in different local pressure zones, similar to the high and low pressures in air. High pressure zones in groundwater induce, under certain conditions, a vertical flow up to the surface. This could be the missing link where hydrostatic pressure is not sufficient to explain springs in deserts, mountains and on islands in the sea. Here, simulations on the Coriolis force acting on groundwater flows are presented.

sted, utgiver, år, opplag, sider
2007.
Emneord [en]
Earth sciences - Atmosphere and hydrosphere sciences
Emneord [sv]
Geovetenskap - Atmosfärs- och hydrosfärsvetenskap
HSV kategori
Forskningsprogram
Vattenteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-40081Lokal ID: f0f6605d-e991-4321-aa3c-7ddc5d0caacfOAI: oai:DiVA.org:ltu-40081DiVA, id: diva2:1013604
Konferanse
International Workshop on Natural Energies : 03/08/2007 - 05/08/2007
Merknad
Godkänd; 2007; 20121107 (bon)Tilgjengelig fra: 2016-10-03 Laget: 2016-10-03 Sist oppdatert: 2017-11-25bibliografisk kontrollert
Inngår i avhandling
1. Secondary currents in groundwater
Åpne denne publikasjonen i ny fane eller vindu >>Secondary currents in groundwater
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The thesis concerns the small vertical water movements created by thermal convection and the Coriolis force acting on groundwater flows. These small flows are of importance to vertical transports of temperature, nutrients and contaminants that would not be spread in the way they are. The first part analyzes thermally driven, seasonal groundwater convection by numerical simulation. The second part shows that the Coriolis force also induces secondary currents in groundwater flow through different vertical permeability distributions. Density driven convection occurs during the autumn in southern Sweden when the ambient air temperature cools the mean groundwater temperature from about 10ºC. When the shallow groundwater is cooled by the ambient air its increased density makes this water sink, slowly increasing in temperature, while pressing the warmer water upwards creating a convection cell. The process is ongoing as long as there is a thermal gradient between ground surface and the groundwater. Under favorable conditions convection can reach a depth of 6m. Such density-driven water movements occur most easily in more permeable soil. In northern Sweden, the situation is reversed, since the mean groundwater temperature is below 4ºC, at which water is at its density maximum. So, in springtime when the uppermost groundwater is heated to 4ºC by the warmer air the convection process starts. Here, the sinking groundwater does not reach the same depth, less than one meter. The Coriolis force has been considered too small to have any effect on groundwater flow, though its importance in meteorology and oceanography is well established. These theories have been applied using numerical simulations of groundwater flow. The numerical model has been validated by simulating some earlier studies of Coriolis forces in fluids. Furthermore the model has been extended to include porous media. It has been shown that secondary currents occur in nonlinear vertical permeability distributions. For simulations of constant and linear distributions no secondary currents have been seen. The development is more pronounced in confined aquifers. The structure of the bottom of the aquifer  affects  how the secondary currents arise. It was shown that both temperature gradients and the Coriolis force form secondary currents in groundwater and a general conclusion is that groundwater flow is more complex than previously assumed.

sted, utgiver, år, opplag, sider
Luleå: Luleå University of Technology, 2017. s. 70
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Emneord
Groundwater
HSV kategori
Forskningsprogram
Vattenteknik
Identifikatorer
urn:nbn:se:ltu:diva-66411 (URN)978-91-7790-006-1 (ISBN)978-91-7790-007-8 (ISBN)
Disputas
2017-12-15, F1031, Luleå, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2017-11-14 Laget: 2017-11-11 Sist oppdatert: 2018-01-13bibliografisk kontrollert

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