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Projeto de investigação
Desenvolvimento de um índice de vulnerabilidade para a avaliação do risco de inundação em estuários: uma abordagem integrada
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Improving Estuarine Flood Risk Knowledge through Documentary Data Using Multiple Correspondence Analysis
Publication . Rilo, Ana; Tavares, Alexandre Oliveira; Freire, Paula; Zêzere, José Luís; Haigh, Ivan D.
Estuarine margins are usually heavily occupied areas that are commonly affected by
compound flooding triggers originating from different sources (e.g., coastal, fluvial, and pluvial).
Therefore, estuarine flood management remains a challenge due to the need to combine the distinct
dimensions of flood triggers and damages. Past flood data are critical for improve our understanding
of flood risks in these areas, while providing the basis for a preliminary flood risk assessment, as
required by European Floods Directive. This paper presents a spin-off database of estuarine flood
events built upon previously existing databases and a framework for working with qualitative past
flood information using multiple correspondence analysis. The methodology is presented, with steps
ranging from a spin-off database building process to information extraction techniques, and the
statistical method used was further explored through the study of information acquired from the
categories and their relation to the dimensions. This work enabled the extraction of the most relevant
estuarine flood risk indicators and demonstrates the transversal importance of triggers, since they are
of utmost importance for the characterization of estuarine flood risks. The results showed a relation
between sets of triggers and damages that are related to estuarine margin land use, demonstrating
their ability to inform flood risk management options. This work provides a consistent and coherent
approach to use qualitative information on past floods, as a useful contribution in the context of
scarce data, where measured and documentary data are not simultaneously available
Enhancing estuarine flood risk management: comparative analysis of three estuarine systems
Publication . Rilo, Ana; Tavares, Alexandre Oliveira; Freire, Paula; Zêzere, José; Haigh, Ivan D.
Estuarine flood risk management is a challenge for coastal managers since this type of system is usually
complex due to the presence of multiple trigger combinations that can induce flood events affecting different
types of human occupation. Furthermore, legal directives demanded countries to have flood risk assessment
tools therefore enhancing knowledge on estuarine triggers and flood damage typologies is useful for coastal
managers. In this study three different flood events are compared and contrasted, each one having occurred in a
different estuarine system chosen based on a set of criteria (temporal proximity, occurrence of human damages
and at least three flood triggers identified in each database). The diversity of data sources that characterizes
each database was examined, for the three events, which are described in terms of triggers and damages. The
comparison highlighted that the local context was important in the estuarine flood combination of triggers and
disclosed two categories (one category comprising infrastructure economic and human damages; and another
category involving circulation interruption and functions disruption) of flood damages common between the
studied systems corresponding to different levels of relevance for management. The enhanced knowledge
acquired allowed the construction of a conceptual framework for damages that can contribute to more adequate estuarine flood risk frameworks.
Dealing with multisource information for estuarine flood risk appraisal in two Western European Coastal Areas
Publication . Rilo, Ana; Tavares, Alexandre Manuel de Oliveira Soares; Freire, Paula Maria dos Santos; Zêzere, José
Estuaries are usually affected by compound flooding triggers that cause diverse territorial damages. While fluvial flood risk assessment frameworks are well established in the literature, integrated management instruments that deal with estuarine flood risk remain incomplete and often lacking. This research presents a methodology to extract relevant information from multiple sources post-event and a database building process that is applied to two contrasting estuaries (the Tagus River estuary in Portugal, and the Shannon River estuary in Ireland) in the Western European coastal area. Overall, a total of 274 documents were analyzed and the information was stored in two databases. Multiple correspondence analysis was applied to extract the most informative and relevant estuarine flood indicators. An integrated estuarine flood risk assessment framework is presented and discussed based on the extracted indicators. The framework is driven by two distinct dimensions (oceanic and hydrographic) and revealed the transversal position of triggers of estuarine floods, reflecting the compounding effects usually present in these areas. The results also highlight two levels of flood risk mostly based on damage typology.
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Fundação para a Ciência e a Tecnologia
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Número da atribuição
SFRH/BD/111166/2015