A replication of landslide hazard mapping at catchment scale

Dahal, Ranjan Kumar; Hasegawa, Shuichi; Bhandary, Netra Prakash; Poudel, Prem Prasad; Nonomura, Atsuko; Yatabe, Ryuichi

doi:10.1080/19475705.2011.629007

Cited by 51 publications

(30 citation statements)

References 54 publications

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“…From this, it is well understood that if replication of a deterministic model is carried out employing parameters-based multivariate regression modelling, the prediction accuracy can be significantly increased. Replication of slope failure hazard, as in the present study, can be reviewed in a very few catchment-scale studies, such as Ghimire 2011 andDahal et al 2012 with a similar reasonable performance. However, this study has first indicated the possibility of the replication of a deterministic slope failure hazard model, although research on the deterministic shallow landslide hazard assessment or physically based modelling of shallow landslides has been practised worldwide for the past few decades (Montgomery and Dietrich 1994;Borga et al 1998;Moon and Blackstock 2004;Rosso et al 2006;Meisina and Scarabelli 2007;Dahal et al 2008b;Godt et al 2008;Salciarini et al 2008;Sorbino et al 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, rainfall-triggered slope failure is a recurring problem in the hillslopes of loose colluvium. So, slope failure hazard analysis and its management in catchment scales has been a primary concern of geoscientists and geoengineers (Montgomery and Dietrich 1994;Guzzetti et al 2005;Zolfaghari and Health 2008;Hadmoko et al 2010;Arnone et al 2011;Ching et al 2011;Ghimire 2011;Dahal et al 2012;Segoni et al 2012). Slope failure hazard maps in catchment scales can be used as a cost-effective tool for slope failure hazard mitigation planning and risk analysis.…”

Section: Introductionmentioning

confidence: 99%

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Deterministic slope failure hazard assessment in a model catchment and its replication in neighbourhood terrain

Acharya

Yatabe

Bhandary

et al. 2014

Geomatics, Natural Hazards and Risk

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In this work, we prepare and replicate a deterministic slope failure hazard model in small-scale catchments of tertiary sedimentary terrain of Niihama city in western Japan. It is generally difficult to replicate a deterministic model from one catchment to another due to lack of exactly similar geo-mechanical and hydrological parameters. To overcome this problem, discriminant function modelling was done with the deterministic slope failure hazard model and the DEM-based causal factors of slope failure, which yielded an empirical parametric relationship or a discriminant function equation. This parametric relationship was used to predict the slope failure hazard index in a total of 40 target catchments in the study area. From ROC plots, the prediction rate between 0.719-0.814 and 0.704-0.805 was obtained with inventories of September and October slope failures, respectively. This means September slope failures were better predicted than October slope failures by approximately 1%. The results show that the prediction of the slope failure hazard index is possible, even in a small catchment scale, in similar geophysical settings. Moreover, the replication of the deterministic model through discriminant function modelling was found to be successful in predicting typhoon rainfall-induced slope failures with moderate to good accuracy without any use of geo-mechanical and hydrological parameters.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deterministic slope failure hazard assessment in a model catchment and its replication in neighbourhood terrain

Acharya

Yatabe

Bhandary

et al. 2014

Geomatics, Natural Hazards and Risk

Self Cite

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“…Various models have been applied to landslide susceptibility and hazard mapping (Lee 2007;Guzzetti et al 1999;Pradhan and Lee 2009;Chung and Fabbri 2003;Remondo et al 2003;Van Westen et al 2003;Dahal et al 2012;Bonham-Carter 1994). The knowledge based approach has been followed in the present study.…”

Section: Methodsmentioning

confidence: 99%

Knowledge based landslide susceptibility mapping in the Himalayas

Pathak

2016

Geoenviron Disasters

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Background: Landslides are common geological hazard occurring in the mountainous region. The Himalayan belt is prone to landslide disasters, which is directly linked to the prosperity and development of the area. The present study was carried out around the Chamoli-Joshimath area, which is situated in the Northernmost-belt of the Garhwal Himalaya, India. A strategic road connecting Tibet which also links the famous Hindu temples Badrinath and Kedarnath traverses the area. The main purposes of the present study is to delineate the landslide susceptible zones in the area so that it could be helpful towards landslide disaster risk reduction and to highlight the applicability of knowledge based susceptibility mapping method in the Himalayas. Results: The area comprises low-to-high grade metamorphic rocks as well as carbonate rocks such as limestone and dolomite. In the study area, most of the landslides occur along the road and river sections, and in the thrust or fault zones. The landslide zones are strongly controlled by the Main Central Thrust and other faults and the resulting geomorphic condition. Most of the unstable slopes are prone to plane and wedge failures. There are many active and dormant landslides (covered by vegetation) in the area. The active landslides are due to reactivation of pre-existing ones. Conclusions: The predicted landslide susceptible zones are in good agreement with the historical landslide locations, which is good indication that knowledge based landslide susceptibility mapping can be successfully applied in the Himalayas provided the causative factors are thoroughly understood.

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“…Recently, some literatures have been published from Nepal Himalaya in the field of landslide hazard mapping (e.g. Brunsden et al 1975;Wagner 1981;Kienholz et al 1984;Deoja et al 1991;Dhital et al 1991Dhital et al , 2006Dhital 2000;Dahal et al , 2012Devkota et al 2012). In addition, some studies have been undertaken to understand the mechanism and process in landslide formation (e.g.…”

Section: Introductionmentioning

confidence: 99%

The relationship between geology and rock weathering on the rock instability along Mugling–Narayanghat road corridor, Central Nepal Himalaya

Regmi

Yoshida

Nagata³

et al. 2012

Nat Hazards

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The present study was conducted along the Mugling-Narayanghat road section and its surrounding region that is most affected by landslide and related mass-movement phenomena. The main rock types in the study area are limestone, dolomite, slate, phyllite, quartzite and amphibolites of Lesser Himalaya, sandstone, mudstone and conglomerates of Siwaliks and Holocene Deposits. Due to the important role of geology and rock weathering in the instabilities, an attempt has been made to understand the relationship between these phenomena. Consequently, landslides of the road section and its surrounding region have been assessed using remote sensing, Geographical information systems and multiple field visits. A landslide inventory map was prepared and comprising 275 landslides. Nine landslides representing the whole area were selected for detailed studies. Field surveys, integrated with laboratory tests, were used as the main criteria for determining the weathering zones in the landslide area. From the overall study, it is seen that large and complex landslides are related to deep rock weathering followed by the intervention of geological structures as faults, joints and fractures. Rotational types of landslides are observed in highly weathered rocks, where the dip direction of the foliation plane together with the rock weathering plays a principle role. Shallow landslides are developed in the slope covered by residual soil or colluviums. The rock is rather fresh below these covers. Some shallow landslides (rock topples) are related to the attitude of the foliation plane and are generally observed in fresh rocks. Debris slides and debris flows occur in colluviums or residual soil-covered slopes. In few instances, they are also related to the rock fall occurring at higher slopes.The materials from the rock fall are mixed with the colluviums and other materials lying on the slope downhill and flow as debris flow. Rock falls are mainly related to the joint pattern and the slope angle. They are found in less-weathered rocks. From all these, it is concluded that the rock weathering followed by geological structures has prominent role in the rock slope instability along Mugling-Narayanghat road section and its surrounding regions.

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A replication of landslide hazard mapping at catchment scale

Cited by 51 publications

References 54 publications

Deterministic slope failure hazard assessment in a model catchment and its replication in neighbourhood terrain

Deterministic slope failure hazard assessment in a model catchment and its replication in neighbourhood terrain

Knowledge based landslide susceptibility mapping in the Himalayas

The relationship between geology and rock weathering on the rock instability along Mugling–Narayanghat road corridor, Central Nepal Himalaya

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