Linking Debris Flows and Landslides to Large Floods in Gravel‐Bed Rivers

Marchi, Lorenzo

doi:10.1002/9781118971437.ch17

Cited by 3 publications

(4 citation statements)

References 95 publications

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“…The frequency of flood can cause the underlying ground to become saturated, thus increasing the risk of an event of flooding. Rapid occurrences of flood can also cause blockage of drainage due to debris carried by floodwaters [26]. Multiple occurrences of flood can also cause property damage and reducing the overall quality of properties in flood prone areas.…”

Section: Frequency Of Occurrencesmentioning

confidence: 99%

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A Review of Key Activities in Hydro Meteorological Disaster Management

Chuan¹,

Thiruchelvam²,

Ghazali³

et al. 2018

IJET

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One of the most highlighted issues in the developing world of the 21st century is the hydrometeorological disasters. Developed and developing nations are all affected by the more prominent climate change. There has been a rise in disaster occurrences over the past decade that this has caused more attention to be given to the topic of disaster management especially to floods. The scale of these disaster events has also intensified and have broken past records with more destructive disasters. This paper intends to review the activities related to hydrometeorological disaster. Key activities are broken down into three different phases, namely pre-disaster, during disaster and post-disaster. Understanding the activities involved is pertinent to not only the lead agencies and non-governmental organizations but plays a bigger role for the vulnerable communities. In the past, communities were the last group to be participative in disaster risk reduction efforts. Today, communities are being engaged from early stage to empower them to be resilient towards the possibility of facing future flood disaster. Evacuation planning and logistics arrangement are key activities prior to the occurrence of any disaster which will ease the implementation of search and rescue operations. However during disaster, it is important for the early warning system to be functioning to alert the affected communities. People also need to be aware of the outbreak of diseases during flood disaster. Finally, post-disaster efforts focuses more on the restoration of damaged infrastructure as well as the mental state of the affected victims. Understanding these key activities will increase the awareness of stakeholders in reducing loss of life and minimizing damages towards properties.

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Section: Frequency Of Occurrencesmentioning

confidence: 99%

“…Human activities such as logging can cause obstruction of flow in rivers. Rubbish in rivers can also cause build-ups thus, causing a restriction of water flow [26].…”

Section: Causes Of Flooding In Malaysiamentioning

confidence: 99%

A Review of Key Activities in Hydro Meteorological Disaster Management

Chuan¹,

Thiruchelvam²,

Ghazali³

et al. 2018

IJET

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“…Generally, the term debris flow is associated with a wide variety of hydrogeomorphic processes and phenomena (e.g., debris torrents, debris slides, mudflows, debris floods, mudslides), usually specific to steep slopes (e.g., mountains, cliffs) frequently impacted by extreme weather conditions (Santangelo et al, 2021;Ortiz-Giraldo et al, 2023). In this context, the interactions between debris flows induced by heavy rainfall and hydrographic network are topics of great relevance for understanding slope evolution, as well as the implications for flood hazards within exposed watersheds (Korup, 2005;Chien-Yuan et al, 2008;Cao et al, 2011a;Cao et al, 2011b;Marchi, 2017). However, the main issue with these types of hydrogeomorphic processes is their relative difficulty in prediction and monitoring due to their rapid manifestation.…”

mentioning

confidence: 99%

UAV and field survey investigation of a landslide triggered debris flow and dam formation in Eastern Carpathians

Mihu-Pintilie,

Stoleriu,

Urzică

2024

Front. Earth Sci.

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In the May–August period of 2010, major heavy rains impacted the Eastern Carpathians (Northeastern Romania), leading to flash floods and triggering numerous landslides. The extreme weather conditions caused damage to the road network, extensive forest destruction, and lead to formation of impounded lakes. One of the hardest-hit areas was the mountain tributaries catchments of the Bistrița watershed. Particularly, the most significant landslide-triggered debris flow event occurred in the upper Iapa valley (Neamț County). The landslide process started near the top of the Drumul Chinezilor ridge in the Goșmanu-Geamăna Massif (Tarcău Mountains), at an elevation of 875 m a.s.l., and the flow-slide fan obstructed a 300-m section of the Iapa watercourse at 615 m a.s.l. This study compiles the climatic, anthropogenic, geological, and geomorphological evidence gathered during the field investigation in the October 2023 and utilizes Unmanned Aerial Vehicle (UAV) data collected to reconstruct the occurred debris flow-slide event. Additionally, it explores considerations regarding the reactivation of landslide processes, dam stability, and the future evolution of the impounded lake (Făgețel Lake: water surface area of 9,500 m2; maximum depth 10 m). Furthermore, the lessons learned and future actions required to prevent further mass movement associated with debris flow-slide processes in prone areas of the Eastern Carpathians are discussed.

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“…Not only do reactivated landslides have a direct impact on the landscape, society and infrastructure, they also have an indirect impact through elevated sediment transport on hill slopes and into fluvial systems (Marchi, 2017;Davies & Korup, 2007;Korup 6.7. IMPLICATIONS FOR KAIKŌURA et al, 2004).…”

Section: Implications For Kaikōuramentioning

confidence: 99%

Laboratory simulations of rainfall-induced landslide reactivation mechanisms following the 2016 Kaikōura Earthquake

Lee¹

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Increases in rainfall-induced landsliding following large earthquake are well documented but the time frames over which this heightened hazard persists in the land scape remains poorly understood. Whilst it is well known that the presence of failed and partially slopes after earthquakes significantly reduces the rainfall thresholds required to activate slope movement, their failure susceptibility during specific storms and how this changes through time remains poorly studied. To improve knowledge in this field requires well documented slope failures following earthquakes and a detailed understanding of their potential failure mechanisms when pore pressures are elevated in the slope. The 2016 Mw 7.8 Kaikōura earthquake provides a unique opportunity to study how rainfall events following the earthquake may impact the timing and mechanisms of landslide reactivation. This study conducted a suite of specialist triaxial cell experiments, designed to replicate varying rainfall scenarios on remoulded samples collected from two sites where numerous earthquake-induced landslides were recorded in similar Late Cretaceous to Neogene sediments with similar physical properties (the Leader Dam Landslides (LDL) and the Limestone Hill landslide (LHL)). In each experiment rainfall events were simulated using a series of different pore pressure scenarios (increases and decreases in mean effective stress) at representative field stress conditions whilst monitoring material deformation behaviour. The results demonstrate that both the deformation behaviour and pore pressure required to generate failure were influenced by the previous changes in pore pressure. Samples subjected to stepped increases in pore pressure were subject to greater pre-failure deformation (dilation) and subsequently failed at lower pore pressures (higher mean effective stress) when compared to samples subjected to linear increases in pore pressure. In addition, increases in the rate of pore pressure also increased the amount of pre-failure deformation allowing failure to occur when pore pressures were lower. In contrast a sample subjected to both increases and decreases in pore pressure underwent pre-failure densification and subsequently required a larger increase in pore pressure to fail. The results demonstrate that landslide reactivation is influenced by a number of factors including the amount and rate of previous changes in pore pressure and the slope drainage history. The results provide new insights into why landslide susceptibility may remain elevated for prolonged periods of time (e.g. decades) in the landscape as well as why the rainfall thresholds for site specific failures during storms may be difficult to predict.

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Linking Debris Flows and Landslides to Large Floods in Gravel‐Bed Rivers

Cited by 3 publications

References 95 publications

A Review of Key Activities in Hydro Meteorological Disaster Management

A Review of Key Activities in Hydro Meteorological Disaster Management

UAV and field survey investigation of a landslide triggered debris flow and dam formation in Eastern Carpathians

Laboratory simulations of rainfall-induced landslide reactivation mechanisms following the 2016 Kaikōura Earthquake

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