A paradigm quantitative approach for a regional risk assessment and management in a few landslide prone hamlets along the windward slope of Western Ghats, India

Sajinkumar, K.S.; Anbazhagan, S.; Rani, V. R.; Muraleedharan, C.

doi:10.1016/j.ijdrr.2013.10.004

Cited by 24 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some factors remarkably react and play a role in control while some factors interact with other factors and impose the remarkable effects. Therefore, the risk assessment index will be selected based on the detailed research on the conditions in Dali City in combination with the findings of the predecessors [Michoud et al, 2012;Sajinkumar et al, 2014;Liu et al, 2015], the national standards and the relevant literature indexes [Raghuvanshi et al, 2014;Uromeihy and Mahdavifar, 2000;Aleotti and Chowdhury, 1999]. In combination with the characteristics of the research area and the currently available data and information, two kinds of factors including the basic factors and the inducing factors are selected [Caine, 1980].…”

Section: Yang Et Al / Physics and Chemistry Of Thementioning

confidence: 99%

Geological risk assessment for the rapid development area of the Erhai Basin

Liu

Wang

Gui

et al. 2015

Physics and Chemistry of the Earth, Parts A/B/C

View full text Add to dashboard Cite

a b s t r a c tFor low-slope hilly land development to have more new land space in a watershed, it is particularly important that to coordinate the sharply increasing conflicts between mountainous and urban land utilization in the city. However, development of low-slope hilly land easily induce potential risks of geologic hazards such as landslide and landslip. It may lead to further environmental losses in a watershed. Hence, it is necessary to study potential risks of geo-hazards in low-slope hilly land development in urban area. Based on GIS spatial analysis technique, we select a study area, Dali City in the Erhai Basin located in watershed belt of Jinsha River, Lancang River and Red River in Yunnan Province of China. Through studying some relevant key indexes and parameters for monitoring potential risks of geo-hazards, we establish a composite index model for zoning the area with potential risks of geohazards in development of low-slope hilly land in the study area. Our research findings indicate that the potential risks of geo-hazards in eastern Dali City is relatively low while of that on slow hills with gentle slopes in the western area are relatively high. By using a zoning research method, generated maps show geological information of potential risks of geo-hazards on low-slope hilly land which provide important messages for guarding against natural geo-hazards and potential environmental losses in a watershed.

show abstract

Section: Yang Et Al / Physics and Chemistry Of Thementioning

confidence: 99%

Geological risk assessment for the rapid development area of the Erhai Basin

Liu

Wang

Gui

et al. 2015

Physics and Chemistry of the Earth, Parts A/B/C

View full text Add to dashboard Cite

show abstract

“…This region is characterized by rugged hills with steep long side slopes on which rests the loose unconsolidated soil and earth material. Over saturation of slopes fractured by tectonic forces, affected by weathering processes and compounded by anthropogenic interface leads to frequent slope failure in this highly rugged mountain system (Thampi et al 1998;Sajinkumar et al 2013). Rainfall-induced landslides are the most common form of landslides worldwide (Dai and Lee 2001;Dai et al 2003;Tu et al 2009;Park et al 2013;Chen et al 2014), and the study area is no exception.…”

Section: Introductionmentioning

confidence: 97%

Geomorphic appraisal of landslides on the windward slope of Western Ghats, southern India

Sajinkumar

Anbazhagan

2014

Nat Hazards

Self Cite

View full text Add to dashboard Cite

The Western Ghats, the bold westerly escarpment of India paralleling the west coast, are characterized by different geologic and geomorphic units formed during different episodes of Earth's history. The majority of these present day landforms evolved in response to the tectonic activity that the Western Ghats witnessed during the Tertiary period. The major structural features together with the geomorphic units have predominant role in the occurrence of cataclysmic landslides which the windward slope of Western Ghats witness during the peak monsoon season. The Kerala and Periyar lineaments, which are the sites of minor earthquakes, pass through the study area. Escarpments and structural hill systems are the vulnerable landforms for landslide occurrence. Due to the predominant role of these tectonic and geomorphic features in the capricious change of landforms, a study was carried out in this hilly terrain based on geomorphology. The study of soil, slope morphometry, relative relief, land use/land cover and hydrogeological conditions together with a multidimensional analysis in a GIS environment resulted in classifying the entire area into different landslide susceptible zones based on Bureau of Indian Standards. Moreover, the area is also divided into three zones based on the terrain conditions and the type of landslide occurrence. The methodology can well fit with any area experiencing the same terrain conditions and can be used to classify an area on the basis of landslide occurrence and geomorphology.

show abstract

“…Whereas in 2018 alone, landslides caused more than 433 casualties (Abraham et al 2019). Though landslides were common in the past, their numbers increased significantly during 2018, 2019, and 2020 (Abraham et al 2019, Achu et al 2020, Sajinkumar et al 2014, Sajinkumar & Anbazhagan 2015. For example, in the Idukki district, 64 major landslides occurred until 2010, whose total count rose to 2223 in 2018 (Hao et al 2020, Kuriakose et al 2010, Kuriakose, Sankar & Muraleedharan 2009.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Initiation, Runout, and Rainfall Thresholds of Extreme-Precipitation-Induced Debris Flows

Subramanian

Yunus

Jasin

et al. 2021

Preprint

View full text Add to dashboard Cite

The frequency of unprecedented extreme precipitation events is increasing, and consequently, catastrophic debris flows occur in regions worldwide. Rapid velocity and long-runout distances of debris flow induce massive loss of life and damage to infrastructure. Despite extensive research, understanding the initiation mechanisms and defining early warning thresholds for extreme-precipitation-induced debris flows remain a challenge. Due to the nonavailability of extreme events in the past, statistical models cannot determine thresholds from historical datasets. Here, we develop a numerical model to analyze the initiation and runout of extreme-precipitation-induced runoff-generated debris flows and derive the Intensity-Duration (ID) rainfall threshold. We choose the catastrophic debris flow on 6 August 2020 in Pettimudi, Kerala, India, for our analysis. Our model satisfactorily predicts the accumulation thickness (7 m to 8 m) and occurrence time of debris flow compared to the benchmark. Results reveal that the debris flow was rapid, traveling with a maximum velocity of 9 m/s for more than 9 minutes. The ID rainfall threshold defined for the event suggests earlier thresholds are not valid for debris flow triggered by extreme precipitation. The methodology we develop in this study is helpful to derive ID rainfall thresholds for debris flows without historical data.

show abstract

A paradigm quantitative approach for a regional risk assessment and management in a few landslide prone hamlets along the windward slope of Western Ghats, India

Cited by 24 publications

References 12 publications

Geological risk assessment for the rapid development area of the Erhai Basin

Geological risk assessment for the rapid development area of the Erhai Basin

Geomorphic appraisal of landslides on the windward slope of Western Ghats, southern India

Mechanisms of Initiation, Runout, and Rainfall Thresholds of Extreme-Precipitation-Induced Debris Flows

Contact Info

Product

Resources

About