Magnitude–frequency characteristics and preparatory factors for spatial debris-slide distribution in the northern Faroe Islands

Dahl, Mads-Peter Jakob; Mortensen, Lis; Jensen, Niels H.; Veihe, Anita

doi:10.1016/j.geomorph.2012.09.015

Cited by 11 publications

(5 citation statements)

References 54 publications

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“…They further noted that in the Tinalah watershed, for instance, the landslide occurrence coincides mostly with an elevation of higher than 400 m.a.s.l., a slope of 20 o , an east-to-west slope direction, and a flat curvature. However, according to Dahl et al (2011) discriminant function analysis shows that preparatory factors responsible for spatial debris-slide distribution are aspect, slope angle, stream density, plan curvature and altitude, while influence of lithology, dip, profile curvature and differences in infield/outfield areas are negligible. Thus, overall there is still lack of consensus on the topographic factors underpinning landslide distribution.…”

Section: Introductionmentioning

confidence: 97%

Topographic influence on landslides characteristics and implication for risk management in upper Manafwa catchment, Mt Elgon Uganda

Nakileza

Nedala

2020

Geoenviron Disasters

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This study aimed to characterize the topographic effect on landslides attributes and explore the implications on risk management in a tropical mountainous environment. A database was constructed based on landslide inventory from field surveys supplemented by desk research. The topographic parameters were derived from STRM DEM of a 30 m resolution for the study area. The analysis of the data was conducted in Arc GIS 10.5 environment. The relationship between landslides and topographic conditioning factors was analysed using the Frequency Ratio model. Results revealed that most landslides were distributed within the altitudinal range of 1500 to 1800 m a.s.l. on moderately steep slopes (15 o-20o) in concave curvatures (hollows). Shallow slides mainly debris flows and debris slides were predominant. Most slope failures were initiated on mid to upper slope positions in either new or old scars. Some runout depositions of large slides ended in streams thus undermining water quality. The findings on topographic parameters have implications and yet landslide risk management by the local population was generally inadequate. Any efforts toward effective landslide risk management should prioritise greening the sensitive topographic hollows and old scars particularly on mid to upper slope positions.

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Section: Introductionmentioning

confidence: 97%

Topographic influence on landslides characteristics and implication for risk management in upper Manafwa catchment, Mt Elgon Uganda

Nakileza

Nedala

2020

Geoenviron Disasters

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“…Achieving sustainable sheep grazing regimes is particularly important in mountainous areas, where steep slopes, thin soils and the slow rate of biological processes limit resilience to grazing and trampling. Studies have shown that erosion events correlate with high-intensity grazing in the Faroe Islands (higher altitudes) (Dahl et al 2013), Greenland (mainly one site) (Massa et al 2012) and most notably on Iceland, where erosion of varying severity has been recorded on 70 % of the land area and, although erosion is reported to have decreased, some degraded areas are still grazed (Arnalds 2015;Arnalds and Barkarson 2003). The condition of some parts of the summer grazing land in Iceland has improved considerably in recent years; however, due to lower densities of sheep, shorter grazing seasons and a warmer climate (Thórhallsdóttir 2003), this is still a serious problem in other parts, especially within the volcanic active zone (OECD 2014).…”

Section: Ecosystem Functionmentioning

confidence: 99%

Sheep grazing in the North Atlantic region: A long-term perspective on environmental sustainability

Ross

Austrheim

Asheim

et al. 2016

Ambio

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Sheep grazing is an important part of agriculture in the North Atlantic region, defined here as the Faroe Islands, Greenland, Iceland, Norway and Scotland. This process has played a key role in shaping the landscape and biodiversity of the region, sometimes with major environmental consequences, and has also been instrumental in the development of its rural economy and culture. In this review, we present results of the first interdisciplinary study taking a long-term perspective on sheep management, resource economy and the ecological impacts of sheep grazing, showing that sustainability boundaries are most likely to be exceeded in fragile environments where financial support is linked to the number of sheep produced. The sustainability of sheep grazing can be enhanced by a management regime that promotes grazing densities appropriate to the site and supported by areabased subsidy systems, thus minimizing environmental degradation, encouraging biodiversity and preserving the integrity of ecosystem processes.

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“…They further noted that in the Tinalah watershed, for instance, the landslide occurrence coincides mostly with an elevation of higher than 400 m.a.s.l., a slope of 20 o , an east-to-west slope direction, and a flat curvature. However, according to Dahl et al (2011) discriminant function analysis shows that preparatory factors responsible for spatial debrisslide distribution are aspect, slope angle, sheep density, plan curvature and altitude, while influence of lithology, dip, profile curvature and differences in infield/outfield areas are negligible. Fernandes et al (2004) and Broothaert et al (2012) among others have also noted the role of investigating topographic influence.…”

Section: Introductionmentioning

confidence: 97%

Topographic Influence On Landslides Characteristics And Implication For Risk Management In Upper Manafwa Catchment, Mt Elgon Uganda

Nakileza

Nedala

2020

Preprint

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This study aimed to characterize the topographic effect on landslides attributes and explore the implications on risk management in a tropical mountainous environment. A database was constructed based on landslide inventory from field surveys supplemented by desk research. The topographic parameters were derived from STRM DEM of a 30 m resolution for the study area. The analysis of the data was conducted in Arc GIS 10.5 environment. The relationship between landslides and topographic conditioning factors was analysed using the Frequency Ratio model. Results revealed that most landslides were distributed within the altitudinal range of 1500 to 1800m a.s.l. on moderately steep slopes (15 o -20 o ) in concave curvatures (hollows). Shallow slides mainly debris flows and debris slides were predominant. Most slope failures were initiated on mid to upper slope positions in either new or old scars. Some runout depositions of large slides ended in streams thus undermining water quality. The findings on topographic parameters have implications and yet landslide risk management by the local population was generally inadequate. Any efforts toward effective landslide risk management should prioritise greening the sensitive topographic hollows and old scars particularly on mid to upper slope positions.

show abstract

Magnitude–frequency characteristics and preparatory factors for spatial debris-slide distribution in the northern Faroe Islands

Cited by 11 publications

References 54 publications

Topographic influence on landslides characteristics and implication for risk management in upper Manafwa catchment, Mt Elgon Uganda

Topographic influence on landslides characteristics and implication for risk management in upper Manafwa catchment, Mt Elgon Uganda

Sheep grazing in the North Atlantic region: A long-term perspective on environmental sustainability

Topographic Influence On Landslides Characteristics And Implication For Risk Management In Upper Manafwa Catchment, Mt Elgon Uganda

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