Sediment erosion dynamics of a gullied debris slide: a medium-term record
Sediment erosion dynamics of a gullied debris slide: a medium-term record
复制标题
冲沟碎片滑坡的沉积物侵蚀动力学:中期记录
DOI:
10.1016/j.catena.2014.12.018
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发表时间:
2015
期刊:
影响因子:
6.2
通讯作者:
Johnson R
中科院分区:
文献类型:
--
作者:
Johnson R
Medium-term post-event sediment flux investigations are rare for headwater catchments and particularly sparse for gullied hillslope failures. Repeat field observation, ground photography and cross section measurements of a debris slide scar at the Wet Swine Gill headwater catchment (0.65 km2) in the English Lake District (UK), provide evidence of erosion and deposition dynamics over the medium-term (2002–2014). These data are compared to site topographic and meteorological conditions, to evaluate potential process–response linkages.Rill and gully erosion networks establish soon after the slide failure (1 February 2002); thereafter gully enlargement proceeds rapidly, first by vertical downcutting, prior to lateral expansion and gully wall angle decline. Changes in cross sectional width, depth and area (2002–2013) are characterised by statistically significant (P = < 0.05) negative exponential growth models (R2= width: 0.88–0.97; depth: 0.71–0.86; area: 0.87–0.93). Gully walls were dominated by erosion but the gully bed was characterised by episodic sediment production, storage and transfer often leading to temporary deposition. Specific erosion rates on the gully wall exceeded those on the adjacent slide scar by up to 764% (maximum values = wall: − 0.0084; scar:− 0.0011 m2m− 1d− 1). Upslope contributing (runoff) area and slope gradient are generally important for erosion; although linear regression analysis demonstrates weak or insignificant relationships between meteorological conditions and gully/scar sediment flux. A general conceptual model of slide scar evolution, integrating gully growth and capture, summarises activity at this site. However transferability to locations with terrain characteristics, land management practices and climate conditions different to those existing in the UK uplands remains to be tested. This investigation adds to growing appreciation of the complexities of sediment dynamics in headwater catchments and provides clear evidence for the potential of early management intervention to counter detrimental post-failure sediment erosion; which at this site would have been most effective up to 3–4 years following gully initiation.
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DOI:
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发表时间:
1992
期刊:
影响因子:
--
作者:
A. Harvey
通讯作者:
A. Harvey
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
R. Johnson;J. Warburton
通讯作者:
J. Warburton
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
M. Cooper;C. Stanley
通讯作者:
C. Stanley
影响因子:
3.3
作者:
J. A. Martínez-Casasnovas;M. C. Ramos;D. García-Hernández
通讯作者:
J. A. Martínez-Casasnovas;M. C. Ramos;D. García-Hernández
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
Richard M. Johnson;J. Warburton;A. Mills;C. Winter
通讯作者:
C. Winter