Flood risk assessment: concepts, modelling, applications

Tsakiris, George

doi:10.5194/nhess-14-1361-2014

Cited by 146 publications

(103 citation statements)

References 14 publications

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“…By definition, depth-damage functions include the water depth as the main determinant of direct damage (Appelbaum 1985;Smith 1994;USACE 1996;Penning-Rowsell and Fordham 1994;Pistrika 2010b). However, many more factors such as flow velocity, duration of flooding, sediment load, contamination, the existence of a flood warning system, and the effectiveness of emergency response during a flood event (Smith 1994;Kelman and Spencer 2004;Merz et al 2004;Pistrika and Jonkman 2009;Pistrika 2010b;Tsakiris 2014) may influence the severity and the extent of flood damage to buildings. Flood damage models rarely include all these factors.…”

Section: A General Approach In Damage Estimationmentioning

confidence: 99%

Flood Depth-Damage Functions for Built Environment

2014

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A conventional approach for the economic estimation of direct flood damage to buildings is using the method of depth-damage functions. However, there are few publications that describe in detail the derivation of depth-damage functions based on actual flood damage data. It still remains an open issue whether a site-specific depthdamage function can be applied to another region with similar climate and building conditions. This paper aims at demonstrating a step-by-step methodology for devising depth-damage functions using data from a flood event which occurred in Moschato, a suburb of Athens, Greece in July 2002. It also compares the developed depth-damage functions to functions from other areas with similar conditions. In the case study, the damage percentage is calculated per category of flood-affected property on the basis of relief payments. The replacement cost of the affected components of a building structure and the market value of each category of flood-affected property are estimated in order to develop depth-damage relationships for building structures. The local depth-damage function for residential use is compared to generalized functions and a site-specific function developed for the urban area of Palermo, Italy. Differences and similarities in damage datasets are examined and explained by related causative factors such as structural or architectural features of buildings. Finally, the application of both of the above functions to a third case (the Erasinos river basin in Attica, Greece) resulted in a fair difference (9 %) in the estimation of the expected average annual direct damage to residential buildings.

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Section: A General Approach In Damage Estimationmentioning

confidence: 99%

Flood Depth-Damage Functions for Built Environment

2014

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“…Two-dimensional flood inundation modeling is a pivotal component of flood risk assessment and management. It is therefore not surprising that over the last few decades significant efforts have been devoted to the development of increasingly complex algorithms to simulate the flow of water in streams and floodplains [3][4][5][6][7][8][9][10]. In areas with mild slope terrain, one-dimensional models may produce misleading results and two-dimensional (2D) models are recommended also for their ability to capture preferential flow directions caused by the presence of buildings [11,12].…”

Section: Introductionmentioning

confidence: 99%

Simulating the Influence of Buildings on Flood Inundation in Urban Areas

et al. 2018

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Two-dimensional hydraulic modeling is fundamental to simulate flood events in urban area. Key factors to reach optimal results are detailed information about domain geometry and utility of hydrodynamic models to integrate the full or simplified Saint Venant equations in complex geometry. However, in some cases, detailed topographic datasets that represent the domain geometry are not available, so approximations-such as diffusive wave equation-is introduced whilst representing urban area with an adjusted roughness coefficient. In the present paper, different methods to represent buildings and approximation of the Saint Venant equations are tested by performing experiments on a scale physical model of urban district in laboratory. Simplified methods are tested for simulation of a real flood event which occurred in 2013 in the city of Olbia, Italy. Results show that accuracy of simulating flow depth with a detailed geometry is comparable to the one achieved with an adjusted roughness coefficient.

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“…In fact from Bstructural defence^based on a certain probability of exceedance, we move to a balance of flood risk and protection measures. As a statesman mentioned, the flood directive can be summarised by the slogan Bwe have to live with floods^ (Tsakiris 2014).…”

Section: The Flood Directivementioning

confidence: 99%

“…The paper is based principally on the EU documents, the reports of the related agencies (e.g., the European Environment Agency), some pier reviewed papers on the assessment of EU directives (e.g., Kristensen et al 2013) and previous reviews of mine on the subject (Tsakiris et al 2009;Tsakiris , 2014. A prior version of this paper was presented at the World Environmental and Water Resources Congress of ASCE/ Watershed Council Awards Luncheon at Austin-Texas on the 19th of May 2015.…”

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confidence: 99%

The Status of the European Waters in 2015: a Review

Tsakiris

2015

Environ. Process.

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The paper aims at presenting the recent European developments in water resources management with particular focus on the EU policies related to floods, droughts and ecosystems and their implementation. In this context, the Water Framework Directive (WFD), the Flood Directive and the Communication on Water Scarcity and Droughts are critically presented and analysed. Also, the main methodologies endorsed by the member states for the implementation of EU directives, such as the DPSIR (Driver-Pressure-State-Impact-Response), the risk assessment and the CEA (Cost-Effectiveness Analysis) are briefly discussed. Further, the first account of the implementation of the EU directives by the member states is presented, together with the statistics that resulted from the first River Basin Management Plans of WFD and the first results from the Flood Directive. It is concluded that despite the significant progress achieved up to now on the fulfilment of the environmental objectives, there is still a long way to go particularly for the new member states of the EU. Enhanced integration of all related policies and better coordination is still required for improving the effectiveness of the Programmes of Measures (PoMs) in the River Basin Districts of the EU territory. Finally, future amendments in European policies on water resources are discussed which will lead to revised environmental objectives for the second and third stage applications of the water directives by the EU member states.

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Flood risk assessment: concepts, modelling, applications

Cited by 146 publications

References 14 publications

Flood Depth-Damage Functions for Built Environment

Flood Depth-Damage Functions for Built Environment

Simulating the Influence of Buildings on Flood Inundation in Urban Areas

The Status of the European Waters in 2015: a Review

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