Geomorphometric Characteristics of Landslides in the Tinalah Watershed, Menoreh Mountains, Yogyakarta, Indonesia

Nugraha, Henky; Wacano, Dhandhun; Dipayana, Gilang Arya; Cahyadi, Ahmad; Mutaqin, Bachtiar Wahyu; Larasati, Ajeng

doi:10.1016/j.proenv.2015.07.068

Cited by 28 publications

(17 citation statements)

References 40 publications

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“…Topography, which is a major land surface characteristic constituting a key pre-condition/ factor in landslide occurrence, needs to be further investigated to guide planning and risk management. Nugraha et al (2015) argued that land surface (geomorphometric) characteristics, have a significant relationship with the landslide distribution. 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.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

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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“…A raster-based spatial analysis between landslide events and geomorphometric characteristics was carried out, based on Nugraha et al (2015). More precisely the landslide inventory data from the field and literature totaling to 284 records was imported into Arc GIS 10.5 for analysis of the landslide distribution and their characteristics with respect to geomorphometric parameters (slope, aspect, altitude, plan curvature).…”

Section: Gis Data Layers and Data Analysismentioning

confidence: 99%

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.

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“…This knowledge will help the authorities to make informed decisions in mitigating such occurrences. Despite the socio-economic and geomorphologic impacts associated with landslides (Ngeku and Mathu, 1999;Ngeku et al, 2004 andJacobs et al, 2016), which are expected to increase with global climate change (Nugraha et al, 2015), studies are still rare in the Africa continent ( The situation is even worst in Sierra Leone, which has very limited and restricted scientific landslide studies (e.g. Thomas, 1983Thomas, , 1994Thomas, & 1998Cui et al, 2019, Redshaw et al, 2019; and Lahai and Lahai 2019), amidst a surge of landslides in its capital city.…”

Section: Introductionmentioning

confidence: 99%

A comparative Geological, Tectonic and Geomorphological assessment of the Charlotte, Regent and Madina Landslides, Western Areas, Sierra Leone

Lahai

Anderson²,

Jalloh

et al. 2020

Preprint

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This work focused on three landslide events that have attracted significant public concern due to the associated calamities. The slides have been analyzed for their geology, tectonics and geomorphological (GTG) characteristics. In addition, an understanding of the link between GTG characteristics and the landslide events was established.To achieve this, field surveys were conducted, particularly for the Charlotte landslide, where identification of geological structures was perturbed by the obliteration of vegetation and sediment accumulations on relatively planar sections of the landslide area. GIS and remote sensing techniques enhanced mapping and determination of landslide characteristics, and laboratory analyses on rock samples provided the petrological characterization of the landslides. Results indicated change in rock composition (gabbro), variable geomorphological characteristics and the nature/pattern and density of discontinuities; these factors, to a large extent, determined the nature and magnitude of the rainfall-triggered landslides. Charlotte lithology slightly differs from and recorded higher Silica (Si) and Aluminum (Al) and lower iron (Fe) than rocks of Regent and Madina landslides. Study also revealed only tenuous correlation between rock composition and weathering depth. The slope angles for the landslides' main scarps (depletion zone) are steep (>45 degree) with altitudes ≈270m, 470m and 200m above sea level for Charlotte, Regent and Madina respectively.Additionally, the area and length of the landslides have relatively high variance (CV=1) and the variance of their run-outs as well is high (CV>1). Finally, information derived from this work can be useful to understand the spatial variation in landslide characteristics and the development of a susceptibility map.

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Geomorphometric Characteristics of Landslides in the Tinalah Watershed, Menoreh Mountains, Yogyakarta, Indonesia

Cited by 28 publications

References 40 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

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

A comparative Geological, Tectonic and Geomorphological assessment of the Charlotte, Regent and Madina Landslides, Western Areas, Sierra Leone

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