Dynamic topography and sediment routing systems
Xuesong Ding, Tristan Salles, Nicolas Flament, Claire Mallard, Patrice Rey
- Badlands 1.0
Model setup of a generic case showing a wave of positive dynamic topography migrating under a fixed circular continent. The circular continent is 700 km in diameter with a spatial resolution of 1 km. Its initial landscape of the continent consists of a central plateau (source area) surrounded by an alluvial plain (transfer zone) and a continental margin (sink area). A sinusoidal wave of positive dynamic topography with a wavelength of 1000 km and amplitude of 300 m propagating to the west at 5 cm/yr is considered.
|Non Marine Erodibility||K_e||2.e-7|
|(Rainfall * Area) exponent m||m||0.5|
|Slope exponent n||n||1.0|
|Slope Minimum for Flood-plain Deposition||slp_cr||0.001|
|Non-Marine % Max Deposition||perc_dep||0.5|
|Land sed. Transport by River||criver||10|
|Land sed. Transport by Wind||caerial||0.001|
|Lake/Sea sed. Transport by Currents||cmarine||0.005|
|No. Time Steps To Distribute Marine Deposits||diffnb||5|
|Marine % Max Deposition||diffprop||0.4|
(a) Sediment supply histories and erosion of stratigraphic layers, stratal stacking patterns represented by (b) depositional environments, (c) interpreted systems tracts, and (d) Wheeler diagrams reconstructed on the eastern margin. (e-h) Same for the western margin. Paleo-depth is assumed to be a proxy for depositional environments, including alluvial plain (>0 m), shoreface (or delta front, 0-30 m), distal offshore (or prodelta, 30-100 m), upper slope (100-300 m), middle slope (300-500m) and abyss (>500 m). Key stratigraphic surfaces and their timing are indicated in c, d, g and h. Systems tracts are interpreted for Case 3 with abbreviations: A - aggradation, P - progradation, R - retrogradation, D - degradation, HST - highstand systems tract, TST - transgressive systems tract, LST - lowstand systems tract, FSST - falling-stage systems tract, MTS - maximum transgressive surface, MFS - maximum flooding surface, TS – transgressive surface, MRS - maximum regressive surface, SB - sequence boundary.