Flood risk assessment and mapping in peri-urban Mediterranean environments using hydrogeomorphology. Application to ephemeral streams in the Valencia region (eastern Spain)

Belmonte, Ana María Camarasa; Soriano-García, Julián

doi:10.1016/j.landurbplan.2011.10.009

Cited by 72 publications

(38 citation statements)

References 49 publications

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“…Extreme events, being greater in magnitude and with a strong seasonality, occur in Mediterranean regions (Sala 2003;Gaume et al 2009;Llasat et al 2010a, b;Camarasa-Belmonte and Soriano-García 2012). It is in the coastal areas where these phenomena pose a considerable risk due to the high vulnerability of urban development and an increase in population and tourism during the summer season (Llasat et al 2010a, b;Camarasa-Belmonte et al 2011).…”

Section: Flash Floodmentioning

confidence: 99%

“…In Spain, the Consorcio de Compensacion de Seguros (CCS), a public corporation which provides insurance to cover ''extraordinary'' risks, states that 61% of its resources are required to mitigate damages incurred as a result of flood events (Insurance Compensation Consortium 2016). The greatest number of casualties and material damages have occurred in the Spanish Mediterranean (Barnolas and Llasat 2007;Camarasa-Belmonte and Soriano-García 2012). Moreover, in the absence of additional adaptation, the risk from coastal flooding is predicted to rise in the future as a result of two primary factors.…”

Section: Introductionmentioning

confidence: 99%

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A multi-component flood risk assessment in the Maresme coast (NW Mediterranean)

2017

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Coastal regions are the areas most threatened by natural hazards, with floods being the most frequent and significant threat in terms of their induced impacts, and therefore, any management scheme requires their evaluation. In coastal areas, flooding is a hazard associated with various processes acting at different scales: coastal storms, flash floods, and sea level rise (SLR). In order to address the problem as a whole, this study presents a methodology to undertake a preliminary integrated risk assessment that determines the magnitude of the different flood processes (flash flood, marine storm, SLR) and their associated consequences, taking into account their temporal and spatial scales. The risk is quantified using specific indicators to assess the magnitude of the hazard (for each component) and the consequences in a common scale. This allows for a robust comparison of the spatial risk distribution along the coast in order to identify both the areas at greatest risk and the risk components that have the greatest impact. This methodology is applied on the Maresme coast (NW Mediterranean, Spain), which can be considered representative of developed areas of the Spanish Mediterranean coast. The results obtained characterise this coastline as an area of relatively low overall risk, although some hot spots have been identified with high-risk values, with flash flooding being the principal risk process.

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Section: Flash Floodmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A multi-component flood risk assessment in the Maresme coast (NW Mediterranean)

2017

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“…Flooding is one of the most important, dangerous and destructive natural hazards in the Mediterranean region [8][9][10][11][12][13]. In Portugal, flooding was the most deadly natural disaster during the 20 th century [14], in which the Lisbon Metropolitan Area (LMA) is a particularly affected region.…”

Section: Introductionmentioning

confidence: 99%

The potential of two types of urban flooding to cause material damages in Lisbon, Portugal

Leal¹,

Ramos²

2017

Int. J. SAFE

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The incapacity to cope with heavy rainfall events leads to flooding in urban areas. Urban flooding is usually divided into pluvial flooding, sewer flooding, among others. Determining which of these types was responsible to cause a flooding occurrence is, in most cases, an error-prone task, because it can be triggered by more than one of them and there is frequently an overlap in their extent.Given these problems, a classification based on the hydro-geomorphological features was applied to Lisbon, in which the relief and the ancient floodplains are still crucial factors in the city's current overland flow behavior. Two types of flooding are proposed: flooding related to natural drainage network (FREN) and flooding unrelated to natural drainage network (FUNN). In order to determine the material damages associated to FREN and FUNN and their spatial distribution, an insurance flooding database (2000-2011) was used. Through the accurate location of the APS (the Portuguese Association of Insurers) database flooding records triggered by rainfall and the reconstruction of the Lisbon's natural drainage network, it was possible to define which type of flooding caused each reported claim.There are different spatial patterns in Lisbon concerning FREN and FUNN. FREN occurs along the valley bottoms, while FUNN has a more scattered spatial pattern, meaning that FUNN can occur where there are overland flow difficulties. 53% of the claims were caused by FUNN; however, higher payouts are associated with FREN (58%). Resorting only to the claims recorded during an extreme rainfall event (in 18 February 2008), the weight of FREN is even more pronounced with 58% of the claims and 71% of the payouts. This proves the higher FREN's potential to cause material damages when compared to FUNN's. This knowledge can be applied to the flooding mitigation or adaptation measures to be included in urban planning.

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“…Moreover, Mediterranean ephemeral streams have specific features compared to other river systems. These basins are small and highly torrential and may generate flash-floods [7]. Runoff generation in semiarid zones is the result of many spatial and temporal complex processes related to hillslope and catchment scale.…”

Section: Introductionmentioning

confidence: 99%

Rainfall thresholds derivation for warning pluvial flooding risk in urbanised areas

Candela

Aronica

2016

E3S Web Conf.

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Abstract. Aim of this work is the development of an operational tool for pluvial flooding warning in an urban area based on off-line rainfall thresholds derived by coupling a rainfall±runoff modelling and a hydraulic routing. The critical conditions considered for issue flood warnings were not only based on the water stage, but also on the extension of the flooded area. Further, a risk assessment framework for quantifying the reliability of the rainfall thresholds has been included; rainfall thresholds used in pluvial flooding warning should be influenced by the uncertainties in the rainfall characteristics (i.e. rainfall duration, depth and storm pattern). This risk assessment framework incorporates the correlated multivariate Monte Carlo simulation method, an hydraulic model for the simulation of rainfall excess propagation over surface urban drainage structures, i.e. streets and pathways. Thresholds rainfall are defined using a number of inundation criteria, to analyze the change in the rainfall threshold due to various definitions of inundation. Starting from estimated water stages and flooded area from inundation simulation rainfall thresholds can be obtained according a specific inundation criterion, including, together, a critical water depth and a critical flooding area. Finally, the second phase concerns the imminence of a possible hydrological risk by comparing the time when cumulative rainfall and rainfall thresholds meet to each other. The developed procedure has been applied to the real case study of Mondello catchment in Palermo (Italy).

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Flood risk assessment and mapping in peri-urban Mediterranean environments using hydrogeomorphology. Application to ephemeral streams in the Valencia region (eastern Spain)

Cited by 72 publications

References 49 publications

A multi-component flood risk assessment in the Maresme coast (NW Mediterranean)

A multi-component flood risk assessment in the Maresme coast (NW Mediterranean)

The potential of two types of urban flooding to cause material damages in Lisbon, Portugal

Rainfall thresholds derivation for warning pluvial flooding risk in urbanised areas

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