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On the formation of collapse dolines : a modelling perspective
Gabrovšek, Franci (Avtor), Stepišnik, Uroš (Avtor)

URLURL - Predstavitvena datoteka, za dostop obiščite http://www.sciencedirect.com/science/article/pii/S0169555X1100290X Povezava se odpre v novem oknu

Izvleček
Collapse dolines are among the most striking surface features in karst areas. Although they can be the result of different formation mechanisms, evidence suggests that large collapse dolines form due to chemical and mechanical removal of material at and below the level of groundwater. We have applied a genetic model of a two-dimensional fracture network to calculate the rate of dissolutional bedrock removal in the heavily fractured (crushed) zone intersecting a karst conduit in the phreatic zone. To account for infilling and breakdown processes in the crushed zone two simple rules were added to the basic model: 1) continuous infilling of dissolutionally created voids prevents fractures from growing beyond some limited aperture, although the dissolution proceeds, 2) discontinuous collapsing causes sudden closure of a fracture once some critical aperture has been reached. Both rules limit the transmissivity of the network and the related flow rates. Therefore, the constant head difference between the input and the output points is sustained and the flow remains distributed over the entire crushed zone. Provided that restrictions posed by the two rules permit turbulent flow, dissolution rates also remain high in the entire region. High surface area of water-rock contact and high dissolution rates result in high overall removal rates of rock from the crushed zone, one of the necessary conditions for the formation of large closed depressions. Despite the fact that the model neglects some processes and dynamics that would increase the removal rate, the results suggest that large closed depressions could form in the order of 1 million years.

Jezik:Angleški jezik
Ključne besede:krasoslovje, kraške oblike, erozija, udornice, karstology, karst forms, erosion, collapse dolines, numerical model
Vrsta gradiva:Delo ni kategorizirano (r6)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FF - Filozofska fakulteta
Leto izida:2011
Št. strani:str. 23-31
Številčenje:Vol. 134, 1-2
UDK:551.44
ISSN pri članku:0169-555X
DOI:10.1016/j.geomorph.2011.06.007 Povezava se odpre v novem oknu
COBISS.SI-ID:46343010 Povezava se odpre v novem oknu
Število ogledov:307
Število prenosov:89
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Gradivo je del revije

Naslov:Geomorphology
Skrajšan naslov:Geomorphology
Založnik:Elsevier
ISSN:0169-555X
COBISS.SI-ID:9839621 Povezava se odpre v novem oknu

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