epic landslide erosion from mountain roads in yunnan, china – challenges for sustainable development
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2014
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Abstract
Expanding systems of mountain roads in developing countries have significantly
increased the risk of landslides and sedimentation, and have created
vulnerabilities for residents and aquatic resources. We measured landslide
erosion along seven road segments in steep terrain in the upper Salween
River basin, Yunnan, China and estimated sediment delivery to channels.
Landslide erosion rates along the roads ranged from 2780 to 48 235 Mg ha−1 yr−1,
the upper end of this range being the highest rate ever
reported along mountain roads. The two roads with the highest landslide
erosion (FG1 = 12 966 Mg ha−1 yr−1; DXD = 48 235 Mg ha−1 yr−1)
had some of the highest sediment delivery rates to
channels (about 80 and 86%, respectively). Overall, 3 times more
landslides occurred along cut slopes compared to fill slopes, but fill slope
failures had a combined mass > 1.3 times that of cut slope
failures. Many small landslides occurred along road cuts, but these were
often trapped on the road surface. Given the magnitude of the landslide
problem and the lack of attention to this issue, a more sustainable approach
for mountain road development is outlined based on an analysis of landslide
susceptibility and how thresholds for landslide trigger mechanisms would be
modified by road location and different construction techniques.
| Reference Key |
sidle2014naturalepic
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|---|---|
| Authors | ;R. C. Sidle;M. Ghestem;A. Stokes |
| Journal | anziam journal |
| Year | 2014 |
| DOI |
10.5194/nhess-14-3093-2014
|
| URL | |
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