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Ephemeral gullying is an important erosion process in Mediterranean areas suffering from land degradation because of increased drought and human impact. An ephemeral gully is formed when a hydraulic threshold for incision into a resistant soil surface is exceeded. The flow intensity at the soil surface of any landscape position is controlled by topographical parameters, such as local slope (S) and...
Gullies in the Guadalentin catchment, SE Spain, are formed in a variety of lithologies, ranging from schists to marls. There are clear differences in valley and channel morphology between these two types. Gully erosion in schists produces large amounts of clastic material that restricts sediment transport, leading to a relatively smooth transition from gullies to hillslopes, and to broad alluvial...
The cover provided by forest vegetation makes it possible to fight erosion efficiently. Furthermore, vegetation barriers can also play a major role by trapping eroded sediments and thus vegetation located downslope of a gully can be important. The objective of this study is to highlight the role of vegetation distribution in a marly gully in reducing sediment loss at the outlet. To do this, sediment...
This article presents new quantitative evidence that land use in Rwanda contributes to the development of hillslope incisions.Two types of hillslope incisions can be distinguished in southern Rwanda. Incisions of the first type drain an area depending on the form and extension on the natural topography and geology. The Runyinya gully (25 o ) and the Rugabano soil slippage (39 o ) are...
In dispersive marls near Vera, badland gullies are eroding into a previously stable matorral-covered landscape. This relatively recent activity was probably triggered by minor climatic or land-use change. In this landscape, Calvo-Cases and Harvey [Earth Surface Processes and Landforms 21 (1996) 725] argued that new gully-head slopes with differing aspect represent a sequence of progressive erosion...
A single gully system was selected in a small agricultural watershed on the Loess Plateau of China with the objective of measuring and then simulating water and sediment transport and defining alternative land uses to reduce discharge and soil loss. The gully had a total length of about 40 m and was about 30 m wide. The watershed feeding the gully occupied about 1950 m 2 (including the gully...
Linear erosion (LE), including rilling and gullying, has been identified as the major problem for sustainable agriculture in steepland areas. It causes severe environmental, economic, and social impacts. This issue is even more crucial in those areas undergoing rapid changes in land use, as for example northern Laos, and may dramatically affect soil conservation. Despite an increasing interest in...
Catchment scale sediment budgeting models are increasingly being used to target remediation works aimed at controlling erosion and improving water quality. Gully erosion is often a major sediment source and needs to be accounted for in such models in a manner consistent with the scale of analysis and available data. Using 130 measurements of gully cross-sectional area and 45 measurements of gully...
The baseflow of tributaries to the Velhas River in the northwest region of Ouro Preto County (São Francisco Basin, Brazil) has been declining in the last years, without a simultaneous decrease in the water input. This can only be attributed to badly planned human activities, which result in soil crusting or compaction, erosion, among other types of impact, such as groundwater overexploitation and...
Knowledge of soil moisture distributions in gullies, which are highly variable spatially and temporally, is important for both restoring vegetation and controlling erosion in them, but little attention has been paid to this spatio-temporal variability to date. Therefore, we examined soil moisture profiles and their variability along three transects traversing sidewalls of a well-developed gully with...
Soil erosion, in its myriad forms, devastates arable land and infrastructure. As an integral landscape feature, gully erosion is a complex system as its evolution is controlled by upstream migration of a gully head (headcut face), incision of the gully bed (plunge pool) and gravitational mass-movement (widening) on gully channel sidewalls. Bed incision is often limited by the presence of a less erodible...
Field scientists studying badland processes in Mediterranean and Semi-arid climates require assurances that the material in which gullies are presented is not dispersive. A dispersive context means; first, infiltration rates may be radically changing in very short periods due to swelling and deflocculation of clays; second, surface crusts could be the result of translocation of sodium into subsurface...
Land-levelling measures are widely used in the Souss valley, South Morocco, for the implementation of land use change. However, their impact on soil erosion in this region is unclear. This paper presents the approach of combining punctual process analysis through experimental rainfall simulation and gully mapping as well as volume quantification analysing on a local scale using unmanned aerial vehicle...
The Dry-hot Valley of the Jinsha River in southwest China is an ecologically fragile zone in which gully erosion is one of the most important environmental problems due to the high sediment yield from the gully. The vegetation, which impacts the erosion processes of the gully, is important to the ecological environment. In this study, we investigated the vegetation in gully n1 of Yuanmou County, which...
Revegetation plays an important role in controlling soil erosion and improving eco-environmental conditions on the Loess Plateau in China, yet little is known about its beneficial effect on soil properties in gully areas. In this study, we examined the relationship between three revegetation types and ten soil properties along five gully position transects on the loess hilly region of Ansai County,...
Gullies naturally exhibit complex morphologies and hence are difficult to measure. Photogrammetric methods are promising tools to overcome such problems due to 3D reconstruction from overlapping images without disturbing the surface. Airborne (e.g. unmanned aerial vehicles, UAV) and terrestrial image acquisition platforms are possible data sources for comprehensive digital gully modelling. In this...
Temperate Highland Peat Swamps on Sandstone (THPSS) are a distinctive feature of low-relief plateaus in eastern Australia and are listed as an endangered ecological community under state and federal policy. A significant proportion of these ‘upland swamps’ occur within the World Heritage Blue Mountains of NSW. Here, long wall mining, coal seam gas extraction and catchment urbanisation are impacting...
The aim of this study is to estimate the sediment residence time in the stream network of two small headwater catchments (Laval and Moulin) characterized by a badlands landscape entrenched into Jurassic black marls of the Southern French Prealps. The method is based on an intensive field survey of the alluvial storage along the main stream reaches from which a scaling law between the average thickness...
Road-stream crossings constructed with culverts have the potential to alter geomorphic processes in adjacent stream channels. We examined changes in channel geometry and bed sediments in longitudinal profiles related to culverts at five paved forest road crossings with perennial headwater streams and two gullies initiated by point releases of water through ditches. A dendrogeomorphic approach was...
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