Modelling karst geomorphology on different time scales
作者： Georg Kaufmann
DOI: 10.1016/J.GEOMORPH.2008.09.016
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摘要: Abstract The evolution and flow in a karst aquifer is studied with numerical simulations, based on the KARST model (Karst AquifeR Simulation Tool). consists of three-dimensional interconnected network conduits representing fractures rock, porous rock matrix finer fissured system rock. Flow through can be driven by both diffuse recharge from precipitation localised sinking streams, drains towards large resurgence base level. Superimposed onto landscape, which evolve time small-scale diffusive processes, large-scale river erosion, denudation. Fractures are enlarged chemical dissolution, enhancing secondary porosity aquifer. enlargement results dramatic increase conductivity over several orders magnitude, change patterns an initially pore-controlled to heterogeneous fracture-controlled During evolution, water table falling high position close land surface lower level coinciding actual Two scenarios elucidate three dimensions. models then complemented event-type spring discharge modelling, used as predictive tool for contaminant transport.
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