气候变化领域集成服务门户(CCPortal): Lahars and debris flows: Characteristics and impacts

CCPortal

DOI	10.1016/j.earscirev.2019.103003
	Lahars and debris flows: Characteristics and impacts
	Thouret J.-C.; Antoine S.; Magill C.; Ollier C.
发表日期	2020
ISSN	0012-8801
卷号	201
英文摘要	This review describes the mechanisms of lahars and debris flows, and their impacts on buildings, infrastructure and other valuables. Lahars are a type of debris flow restricted to volcanic debris. Both water-rich mass flows, having solid concentration from 40 to 80 % volume and density from 1,300 to 2,400 kg/m3, exhibit velocities ranging between 3 and 30 m/s, peak discharge as high as 48,000 m3/s, volume as large as 100 million m3, and can flow down valley as far as 100 km from the source. The review presents the array of methods and tools used in the field-based and experimental study of hydraulic, physical and rheological characteristics of volcanic and non-volcanic debris flows worldwide. These mass flows share several characteristics and effects with floods, but fewer studies have analyzed the wide range of impacts produced by lahars and debris flows. Damages are induced by three principal forces driving impacts: (1) hydrodynamic pressure, (2) hydrostatic pressure, and (3) the collisional forces of boulders acting as missiles. The impacts of debris flows are diverse, cascading and interacting because the size, the velocity and the proportion of rock debris mixed with water constantly change down valley. The review will complement previous studies in three ways: 1) we investigate how debris-flow characteristics and processes lead to damage mechanisms on buildings, infrastructure and lifelines; 2) we explore the broad range of valuable assets impacted by debris flows, and; 3) we analyze the physical vulnerability of valuables, leading to a review of indicators, matrices and fragility functions, which may lead to better understand loss. The review shows that economic impacts of lahars and debris flows extend well beyond the immediate costs of loss of life and asset damage. Enhanced understanding of flows and their impacts can improve risk mitigation and land use planning. © 2019 Elsevier B.V.
英文关键词	Building; Damage; Debris flow; Exposure; Impact; Infrastructure; Lahar; Loss; Vulnerability
语种	英语
scopus关键词	damage mechanics; debris flow; economic impact; geological hazard; lahar; land use planning; mass movement; risk assessment; structural response; vulnerability
来源期刊	EARTH-SCIENCE REVIEWS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/209730
作者单位	Université Clermont-Auvergne, CNRS, Laboratoire Magmas et Volcans, Clermont-Ferrand, IRD, OPGC F-63000, France; Institut de Physique du Globe, Laboratoire de Tectonique et Mécanique de la Lithosphère, 1 Rue Jussieu, Paris, 75005, France; Department of Environmental Sciences, Faculty of Science and Engineering, Macquarie UniversityNSW 2109, Australia; School of Earth and Environment, The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
推荐引用方式 GB/T 7714	Thouret J.-C.,Antoine S.,Magill C.,et al. Lahars and debris flows: Characteristics and impacts[J],2020,201.
APA	Thouret J.-C.,Antoine S.,Magill C.,&Ollier C..(2020).Lahars and debris flows: Characteristics and impacts.EARTH-SCIENCE REVIEWS,201.
MLA	Thouret J.-C.,et al."Lahars and debris flows: Characteristics and impacts".EARTH-SCIENCE REVIEWS 201(2020).