Alluvial gully erosion in Australia's tropical rivers: A conceptual model as a basis for a remote sensing mapping procedure

摘要: In 2004, an aerial reconnaissance survey of Gulf Carpentaria rivers identified alluvial gully erosion as a likely key sediment source into many rivers. The process is found to varying degrees within river types along most rivers, and more extensive in the larger, steeper gradient It hypothesised that high connectivity between gullies trunk streams makes these features significant Gulf. appears differ significantly scale from well documented, largely colluvial, abound southern Australia. New conceptual models processes driving gullies, controls on their morphology spatial distribution, are required if this be adequately parameterised existing budget models, such SedNet, northern similar exist eastern draining tropical suggesting SedNet may need adjusted account for different style erosion. Our model suggests morphological variability can explained by relative dominance two main headward retreat: basal sapping overland flow driven knickpoint retreat. initiation, rate activity interplay soil type, floodplain relief, vegetation, climate, fire regime, grazing pressure, regime local rainfall context primary processes.