Epic landslide erosion from mountain roads in Yunnan, China  – challenges for sustainable development

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.

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Epic landslide erosion from mountain roads in Yunnan, China – challenges for sustainable development

Natural Hazards and Earth System Sciences Discussions ◽

10.5194/nhessd-2-3887-2014 ◽

2014 ◽

Vol 2 (6) ◽

pp. 3887-3917

Author(s):

R. C. Sidle ◽

M. Ghestem ◽

A. Stokes

Keyword(s):

Sediment Delivery ◽

The Road ◽

Erosion Rates ◽

Construction Techniques ◽

Road Development ◽

On The Road ◽

Steep Terrain ◽

Trigger Mechanisms ◽

Road Segments ◽

Salween River

Abstract. Expanding mountain road networks in developing countries significantly increase the risk of landslides and sedimentation, as well as create 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, three times more landslides occurred along cutslopes compared to fillslopes, but fillslope failures had a combined mass >1.3 times that of cutslope 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 construction techniques.

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THE ROLE OF UNPAVED ROADS IN THE SEDIMENT BUDGET OF A SEMI-ARID MESOSCALE CATCHMENT

10.22541/au.162486576.63306110/v1 ◽

2021 ◽

Author(s):

Teresa Raquel Lima Farias ◽

Pedro Medeiros ◽

José Carlos de Araujo ◽

Joaquin Navarro Hevia

Keyword(s):

Soil Loss ◽

Water Reservoir ◽

Sediment Budget ◽

Northeastern Brazil ◽

Delivery Ratio ◽

Sediment Delivery ◽

Unpaved Roads ◽

The Road ◽

Sediment Connectivity ◽

On The Road

High rates of erosion and runoff production on road infrastructure have been documented, indicating that unpaved roads might be significant sources of sediment in catchments. In this paper, the production of surface sediments from unpaved rural roads at different scales is assessed. The study took place in northeastern Brazil, in a semiarid area of the Caatinga biome, vulnerable to desertification. Sediment production data from road surface segments were monitored for two years (2013-2014) under conditions of natural precipitation. By using hydrosedimentological modeling and Geographic Information System (GIS), the sediment budget was calculated at the meso-scale basin (aprox. 930 km²), in order to identify the relative contribution of roads to the sediment balance. Universal Soil Loss Equation (USLE) associated with Maner’s sediment delivery ratio (SDR) equation, proved to be an adequate approach for predicting sediment yield on the road segment scale; the best results were obtained for the road without traffic, due to the non-interference in this segment of external factors, such as traffic and maintenance activities, not explicitly considered in the model formulation. The modeling procedure showed that the roads, which occupy only 0.7% of the catchment surface, were responsible for approximately 7% of soil loss in the area. Furthermore, sediment connectivity might be enhanced by roads, which cross the river network and, therefore, deliver more directly the sediment generated at hillslopes. This is particularly important in the studied environment, where sediment connectivity is low due to limited runoff and the existence of a dense network of surface water reservoir

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Analisis Prioritas Pembangunan dan Pengembangan Jaringan Jalan di Pro~Si Papua

Warta Penelitian Perhubungan ◽

10.25104/warlit.v22i1.993 ◽

2010 ◽

Vol 22 (1) ◽

pp. 30-44

Author(s):

Anriani Safar ◽

Muhammad Y. Jinca ◽

Roland Barkey

Keyword(s):

Regional Development ◽

Road Network ◽

Transportation Network ◽

The Other ◽

Network Development ◽

The Road ◽

Road Development ◽

Multi Criteria Analysis ◽

On The Road

An Analysis of Priority of Road Network Development in Papua Province (supervised bt; M.Yamin Jinca and Rol.a.nd A. Barket;)The aim of the study was to discover the condition and potential of road development and factorsaffecting its development.The study was a survey using a questionnaire to stakeholders as respondents. The data were analyzedbt; using multi criteria analysis, namely scalogram and hierarchy process.T7re results of the study indicate that the region condition affects the road network developmentespecially at the area with difficult topographic conditions (mountainous) which become the constraintin the developnrent of l.a.nd transportation. The main priority in handling the road network isregion development. The other factors are accessibility, mobz1ity and hierarchy of road network. Thethree factors are not quite different from each other, but they have a low effect on the road networkperformana!. The prioritiy of road development is from Jayapura to Wamena to Mulia, Waena toArso V, Jai;apura to Hamadi to Holtekamp to PNG Border.Keywords : Transportation network, regional development, accessibz1ity and mobilih;.

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