Movie:Effects of high horizontal displacement rates on landscape evolution & pull-apart basins formation
Information Page: Effects of high horizontal displacement rates on landscape evolution & pull-apart basins formation
Effects of high horizontal displacement rates on landscape geomorphological evolution.
|Tristan, Patrice, Salles, Rey
Grade level: Under graduate (13-16), Graduate / Professional
Statement: Effects of high horizontal displacement rates on landscape geomorphological evolution.
Abstract: In this example, we impose over 2 millions of years a deformation field produced with Underworld over an initial flat surface (256 km square box at a resolution of 1 km). Over the deformed surface, a landscape evolution model, Badlands, is used to simulate both hillslope (creep) and overland flow processes (detachment limited) induced by an uniform precipitation rate of 1 m/yr (surface process resolution lower around 250 m).
The continuous 3D deformation field from Underworld is imported every 5000 years in Badlands as an average displacement rate (horizontal & vertical). The geodynamics model boundary conditions forces the formation of pull-apart basins. The internal structure of these basins is highly variable both in space and time owing to complex stress fields and heterogeneous crustal rheology around the termination of the delimiting faults. This complexity has led to several unresolved problems regarding the kinematics and dynamics of pull-apart basins.
Using the coupling between Badlands and Underworld it is now possible to test the time-dependent deformation patterns within pull-apart basins, and the relation of these basins with the adjacent deformed structural domains.
Basin and Landscape Dynamics (Badlands) is a parallel TIN-based landscape evolution model, built to simulate topography development at various space and time scales. The model is presently capable of simulating hillslope processes (linear diffusion), fluvial incision ('modified' SPL: erosion/transport/deposition), spatially and temporally varying geodynamic (horizontal + vertical displacements) and climatic forces which can be used to simulate changes in base level, as well as effects of climate changes or sea-level fluctuations.
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