Gully Erosion: Procedures to Adopt When Modelling Soil Erosion in Landscapes Affected by Gullying - Erosion Modelling - page 380

Knapen, A., Poesen, J., Govers, G., et al . (2007)
Resistance of soils to concentrated flow erosion: A
review. Earth-Science Reviews 80 : 75-109.
Laflen, J.M. & Beasly, R.P. (1960) Effects of compaction
on critical tractive forces in cohesive soils. Univer-
sity of Missouri, Agricultural Experiment Station,
Research Bulletin 749.
Leduc, C., Favreau, G. & Schroeter, P. (2001) Long-term
rise in a Sahelian water-table: the Continental Terminal
in South-West Niger. Journal of Hydrology 243 : 43-54.
Leopold, L.B., Wolman, M.G. & Miller, J.P. (1964)
Fluvial Processes in Geomorphology . Freeman and
Co., San Francisco.
Li, Y. (1995) Plant Roots and Soil Anti-scouribility
on the Loess Plateau . National Natural Science
Foundation of China, Science Press, Bejing, 133 pp.
Martínez-Casasnovas, J.A., Ramos, M.C. & Poesen, J.
(2004) Assessment of sidewall erosion in large gullies
using multi-temporal DEMs and logistic regression
analysis. Geomorphology 58 : 305-21.
Merkel, W.H., Woodward, D.E. & Clarke, C.D. (1988)
Ephemeral gully erosion model (EGEM). In Modelling
Agricultural, Forest and Rangeland Hydrology .
American Society of Agricultural Engineers
Publication 07-88, St Joseph, MI: 315-23.
Merz, W. & Bryan, R.B. (1993) Critical conditions for rill
initiation on sandy loam Brunisols: laboratory and
field experiments in southern Ontario, Canada.
Geoderma 57 : 357-85.
Moeyersons, J. (1991) Ravine formation on steep slopes -
forward versus regressive erosion - some case-studies
from Rwanda. Catena 18 : 309-24.
Moeyersons, J. (2000) Desertification and man in Africa.
Bulletin of the Royal Academy of Overseas Science,
Brussels, 46 : 151-70.
Moeyersons, J. (2003) The topographic thresholds of
hillslope incisions in southwestern Rwanda. Catena
50 : 381-400.
Montgomery, D.R. (1994) Road surface drainage, chan-
nel initiation, and slope instability. Water Resources
Research 30 : 1925-32.
Montgomery, D. & Dietrich, W. (1988) Where do chan-
nels begin? Nature 336 : 232-4.
Montgomery, D.R. & Dietrich, W.E. (1994) Landscape
dissection and drainage area-slope thresholds. In
Kirkby, M.J. (ed.), Process Models and Theoretical
Geomorphology . John Wiley & Sons, Chichester:
221-46.
Moore, I.D., Burch, G.J. & Mackenzie, D.H. (1988)
Topographic effects on the distribution of surface
soil water and the location of ephemeral gullies.

Transactions of the American Society of Agricultural
Engineers 32 : 1098-1107.
Morgan, R.P.C. & Mngomezulu, D. (2003) Threshold
conditions for initiation of valley-side gullies in the
Middle Veld of Swaziland. Catena 50 : 401-14.
Nachtergaele, J. (2001) A spatial and temporal analysis
of the characteristics, importance and prediction of
ephemeral gully erosion . PhD thesis, Department of
Geography-Geology, K.U. Leuven.
Nachtergaele, J. & Poesen, J. (2002) Spatial and tempo-
ral variations in resistance of loess-derived soils to
ephemeral gully erosion. European Journal of Soil
Science 53 : 449-63.
Nachtergaele, J., Poesen, J., Steegen, A., et al . (2001a)
The value of a physically based model versus an
empirical approach in the prediction of ephemeral
gully erosion for loess-derived soils. Geomorphology
40 : 237-52.
Nachtergaele, J., Poesen, J., Vandekerckove, L., et al .
(2001b) Testing the ephemeral gully erosion model
(EGEM) for two Mediterranean environments. Earth
Surface Processes and Landforms 26 : 17-30.
Nachtergaele, J., Poesen, J., Sidorchuk, A. & Torri, D.
(2002a) Prediction of concentrated flow width in
ephemeral gully channels. Hydrological Processes 16 :
1935-53.
Nachtergaele, J., Poesen, J., Oostwoud Wijdenes, D. &
Vandekerckhove, L. (2002b) Medium-term evolution
of a gully developed in a loess-derived soil.
Geomorphology 46 : 223-39.
Nogueras, P., Burjachs, F., Gallart, F. & Puigdefabregas,
J. (2000) Recent gully erosion in El Cautivo badlands
(Tabernas, SE Spain). Catena 40 : 203-15.
Nyssen, J., Poesen, J., Moeyersons, J., et al . (2002)
Impact of road building on gully erosion risk: a case
study from the northern Ethiopian highlands. Earth
Surface Processes and Landforms 27 : 1267-83.
Okagbue, C.O. & Uma, K.O. (1987) Performance of
gully erosion control measures in southeastern
Nigeria. International Association of Hydrological
Sciences Publication 167 : 163-72.
Oostwoud Wijdenes, D.J. & Bryan, R.B. (2001) Gully-
head erosion processes on a semi-arid valley floor in
Kenya: a case study into temporal variation and sedi-
ment budgeting. Earth Surface Processes and
Landforms 26 : 911-33.
Oostwoud Wijdenes, D., Poesen, J., Vandekerckhove, L.,
et al . (1999) Gully-head morphology and implications
for gully development on abandoned fields in a semi-
arid environment, Sierra de Gata, Southeast Spain.
Earth Surface Processes and Landforms 24 : 585-603.