Data/hora: 16/06/2024 01:45:54

Provedor de dados: 	5	
País: 	France	
Título: 	Analyses of Environmental time series: Extreme Values	
Autores: 	Guanche Garcia, Yanira; Prevosto, Marc; Maisondieu, Christophe; Bulteau, Thomas; Paris, François.	
Data: 	2015-07	
Ano: 	2015	
Resumo: 	The knowledge of extreme events of environmental variables is an issue of increasing concern to the scientific community. Within the branch of coastal and ocean engineering there are many fields of application where an accurate estimation of long term return period events is needed, i.e. coastal defenses design, coastal flooding management, estimation of changes of the littoral morphology, offshore and onshore renewable energy devices design, etc. But not only the engineers are concerned by extreme events; biological communities in the open sea and estuarine systems are also exposed to extreme events that may affect its natural development (i.e. extreme sea levels in estuarine environments could raze fields of plants not able to deal with salt in just a few hours). But the analysis of environmental variables and their extreme behaviors is not an easy task. In most cases the problem to be solved presents a multivariate nature, which makes it of a special complexity. For instance, in the case of flooding analysis, an estimation of joint probability density of astronomical tide, storm surge and waves is needed; or in the case of floating offshore devices the parameters of interest would be waves, winds and currents. Complex mathematical methods and techniques are needed to be able to estimate the joint probability of occurrence of more than one variable at the same time. In addition, some considerations must be taken regarding the quality of the data in order to be able to guarantee the achievement of reliable estimations. In this document, an analysis of the problem of extreme value analyses, the existing methods, their limitations, and some hints to proceed are exposed. The document is divided as follows: a first part will introduce the main problems or aspects that need to be considered concerning data and exposes the main methods to solve univariate problems and the way to estimate statistical parameters; a second part is focused on the main multivariate methods; then, a fourth part will focus on the principal techniques to estimate the uncertainties; finally in the last part the available softwares useful for EV analysis are exposed. In the appendices is presented the application of these methods in two different case studies, one proposed by IFREMER and based on the design of an offshore structure mooring and the second one proposed by BRGM with a focus on a practical application to flood risk in coastal areas.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/00378/48967/49370.pdf

DOI:10.13155/48967

http://archimer.ifremer.fr/doc/00378/48967/	
Formato: 	application/pdf	
Fonte: 	2015 Ifremer, BRGM

info:eu-repo/semantics/openAccess

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