Alluvial gully erosion is a likely key sediment source into many large rivers in tropical Australia. This type of gullying differs fundamentally to the generally accepted gully model from Southern Australia, in that it is found exclusively within alluvium and can propagate entirely as a result of basal sapping. The process is found to varying degrees within alluvial river types along most Gulf ...

Relatively young landforms on Mars, seen in high-resolution images acquired by the Mars Global Surveyor Mars Orbiter Camera since March 1999, suggest the presence of sources of liquid water at shallow depths beneath the martian surface. Found at middle and high martian latitudes (particularly in the southern hemisphere), gullies within the walls of a very small number of impact craters, south p...

Despite radically different environmental conditions, terrestrial and martian dunes bear a strong resemblance, indicating that the basic processes of saltation and grainfall (sand avalanching down the dune slipface) operate on both worlds. Here, we show that martian dunes are subject to an additional modification process not found on Earth: springtime sublimation of Mars' CO(2) seasonal polar c...

Intense gully erosion has sculptured remarkable channels into the Moldavian Plateau of eastern Romania, especially in its most representative subunit, Bârlad covering >8000 km2. The permanent types are: (1) discontinuous gullies, mostly located on hillslopes and (2) large continuous gullies valley bottoms. This study seeks to improve our understanding development over variable time-scales (most...

a r t i c l e i n f o Gully erosion removes comparatively large volumes of soil from small areas. It is often difficult to quantify the loss of soil because the footprint of individual gullies is too small to be captured by most generally available digital elevation models (DEMs), such as the USGS National Elevation Dataset. Airborne LiDAR (Light Detection and Ranging) has the potential to prov...

Introduction: Recent gullies on Mars are observed on the wallslopes of the mid-latitude regions. They might sign the presence of fluid flows, likely involving liquid water, in a recent past [1]. However, authors have shown that dry flows might be an alternative to the formation of Martian gullies [e.g.2]. Levees are frequently present together Martian gullies independently of their location (du...

Introduction: One of the major surprises of the Mars Global Surveyor mission was the discovery of gullies, a class of unusually young features consisting of an alcove, a channel and a fan [1-2]. These features were interpreted to have originated through the flow of liquid water originating from groundwater discharge [1,2], although alternate interpretations have been presented [see 3]. Uncertai...

Purpose The purpose of our study was to identify major hillslope sediment sources in a partially urbanized coastal watershed supporting salmonid habitat and to evaluate the use of physical and maximum entropy models in predicting sites of greatest concern. Questions include when and where increased runoff from trail and unpaved road surfaces has influenced patterns of landslides and gullies to ...