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J. Poesen, E. Luna, A. França, J. Nachtergaele, Gerard Govers (1999)
Concentrated flow erosion rates as affected by rock fragment cover and initial soil moisture contentCatena, 36
D. Wijdenes, J. Poesen, L. Vandekerckhove, J. Nachtergaele, J. Baerdemaeker (1999)
Gully‐head morphology and implications for gully development on abandoned fields in a semi‐arid environment, Sierra de Gata, southeast SpainEarth Surface Processes and Landforms, 24
K. Vandaele, J. Poesen, Marques Silva, Gerard Govers, Philippe Desmet (1997)
Assessment of factors controlling ephemeral gully erosion in Southern Portugal and Central Belgium using aerial photographsZeitschrift Fur Geomorphologie, 41
J. Poesen, B. Wesemael, Gerard Govers, J. Martínez-Fernández, Philippe Desmet, K. Vandaele, T. Quine, G. Degraer (1997)
Patterns of rock fragment cover generated by tillage erosionGeomorphology, 18
J. Doe (1957)
Soil Map of the WorldNature, 179
J. Brice (1966)
Erosion and deposition in the loess-mantled Great Plains, Medicine Creek drainage basin, Nebraska
J. Ploey (1984)
Hydraulics of runoff and loess loam depositionEarth Surface Processes and Landforms, 9
I. Moore, G. Burch, D. Mackenzie (1988)
Topographic Effects on the Distribution of Surface Soil Water and the Location of Ephemeral GulliesTransactions of the ASABE, 31
(1973)
Gully erosion in the semi-arid west
(1994)
Modelling soil erosion
P. Patton, S. Schumm (1975)
Gully Erosion, Northwestern Colorado: A Threshold PhenomenonGeology, 3
William Ackermann (1976)
Soil and Water ConservationEos, Transactions American Geophysical Union, 57
J. Poesen, B. Wesemael, K. Bunte, A. Benet (1998)
Variation of rock fragment cover and size along semiarid hillslopes: a case-study from southeast SpainGeomorphology, 23
I. Prosser, B. Abernethy (1996)
Predicting the Topographic Limits to a Gully Network Using a Digital Terrain Model and Process ThresholdsWater Resources Research, 32
J. Poesen, Janet Hooke (1997)
Erosion, flooding and channel management in Mediterranean environments of southern EuropeProgress in Physical Geography, 21
I. Prosser, C. Slade (1994)
Gully formation and the role of valley floor vegetation
R. David, E. William (1994)
Landscape dissection and drainage area-slope thresholds, 221246
(1999)
hillslopes: a case study from Southeast Spain. Geomorphology
(1991)
Spain: a dry-region, tectonically active landscape
J. Nachtergaele, J. Poesen, L. Vandekerckhove, D. Wijdenes, M. Roxo (2001)
Testing the Ephemeral Gully Erosion Model (EGEM) for two Mediterranean environmentsEarth Surface Processes and Landforms, 26
J. Poesen, K. Vandaele, B. Wesemael (1996)
Contribution of gully erosion to sediment production in cultivated lands and rangelands, 236
J. Poesen, K. Bunte, C. Brandt, J. Thornes (1996)
Effects of rock fragments on desertification processes in Mediterranean environments
L. Vandekerckhove, J. Poesen, D. Wijdenes, T. Figueiredo (1998)
Topographical thresholds for ephemeral gully initiation in intensively cultivated areas of the MediterraneanCatena, 33
M. Boer (1999)
Assessment of dryland degradation : linking theory and practice through site water balance modelling
D. Montgomery, W. Dietrich (1988)
Where do channels begin?Nature, 336
Gully erosion , land - use and climate change
J. Lastovicka, J. Jackson (1991)
A User's Guide to Principal Components.The Statistician, 42
D. Montgomery, W. Dietrich (1989)
Source areas, drainage density, and channel initiationWater Resources Research, 25
L. Bull, M. Kirkby, J. Shannon, J. Hooke (2000)
The impact of rainstorms on floods in ephemeral channels in southeast SpainCatena, 38
J. Zulueta (1990)
Allue Andrade J. L., 1990: Atlas Fitoclimático de España. Taxonomías. Ministerio de Agricultura, Pesca y Alimentación. Instituto Nacional de Investigaciones Agrarias. Departamento de Sistemas Forestales. Madrid., 20
W. Knisel (1980)
CREAMS: a field scale model for Chemicals, Runoff, and Erosion from Agricultural Management Systems [USA]
Z. Begin, S. Schumm (1979)
Instability of Alluvial Valley Floors: A Method for its AssessmentTransactions of the ASABE, 22
R. Hodgkins, R. Hodgkins (1999)
Controls on suspended-sediment transfer at a High-Arctic glacier, determined from statistical modellingEarth Surface Processes and Landforms, 24
D. Walling, B. Webb (1996)
Erosion and sediment yield : global and regional perspectives
J. Andrade, M. Ángel, J. Corbí (1990)
Atlas fitoclimático de España: taxonomías
W. Dietrich, C. Wilson, D. Montgomery, J. McKean, R. Bauer (1992)
Erosion thresholds and land surface morphologyGeology, 20
E. O'Loughlin (1986)
Prediction of Surface Saturation Zones in Natural Catchments by Topographic AnalysisWater Resources Research, 22
J. Poesen, J. Poesen, K. Vandaele, B. Wesemael (1998)
Gully Erosion: Importance and Model Implications
K. Vandaele, J. Poesen, Gerard Govers, B. Wesemael (1996)
Geomorphic threshold conditions for ephemeral gully incisionGeomorphology, 16
In Mediterranean areas the dynamics of gully development act as an important indicator of desertification. However, little is known about the influence of climate and land‐use changes, and almost no field data exist to assess the sensitivity of a landscape to gully erosion. Two important components of gully erosion studies are the prediction of where gullies begin and where they end. To address some of these issues, topographical thresholds for gully initiation and sedimentation in six different Mediterranean study areas were established. Field measurements of local soil surface slope (S) and drainage‐basin area (A) at the point of initiation of ephemeral gullies in intensively cultivated fields (five datasets) and permanent gullies in rangelands (three datasets) were carried out. A negative power relationship of the form S = aA−b was fitted through all datasets, and defined as the mean topographical threshold for gullying in the respective area. Topographically controlled slopes of sedimentation at the gully bottom were also measured. Compared to theoretical relationships for channel initiation by overland flow, relatively low values for b are obtained, suggesting a dominance of overland flow and an influence of subsurface flow. The influence of landsliding at steeper slopes appeared from the flattening of the overall negative trend in the higher slope range (S > 0·30) of the integrated dataset. Comparing the threshold lines of our datasets to the average trend lines through data found in literature revealed that vegetation type and cover could better explain differences in topographical thresholds level than climatic conditions. In cultivated fields, soil structure and moisture conditions, as determined by the rainfall distribution, are critical factors influencing topographical thresholds rather than daily rainfall amounts of the gully‐initiating events. In rangelands, vegetation cover at the time of incision appears to be the most important factor differentiating between topographical thresholds, overruling the effect of average annual rainfall amounts. Soil texture and rock fragment cover contributed little to the explanation of the relative threshold levels. Differences in regression slopes (b) between the S–A relationships found in this study have been attributed to the soil characteristics in the different study areas, determining the relative importance of subsurface flow and Hortonian overland flow. Sedimentation slopes where both ephemeral and permanent gullies end were generally high because of the high rock fragment content of the transported sediment. A positive relationship was found between the rock fragment content at the apex of the sedimentation fan and the slope of the soil surface at this location. Copyright © 2000 John Wiley & Sons, Ltd.
Earth Surface Processes and Landforms – Wiley
Published: Jan 1, 2000
Keywords: ; ; ; ;
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