The impact of rainstorms on floods in ephemeral channels in southeast Spain

Bull, L. J.; Kirkby, M. J.; Shannon, Joseph P.; Hooke, Janet

doi:10.1016/s0341-8162(99)00071-5

Cited by 100 publications

(90 citation statements)

References 7 publications

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“…Estimating flood peaks from trash lines in watermarks remains the most common method that used in the post-flood analysis. Due to the localised nature of floodwater dynamics spatially results in its flood magnitudes not only for the long period flooding but also flash flooding (Bull et al, 2000;Hooke & Mant, 2000;Smith, 2014).…”

Section: Flood Watermark Extractionmentioning

confidence: 99%

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

Meesuk¹

2017

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Although all care is taken to ensure the integrity and the quality of this publication and the information herein, no responsibility is assumed by the publishers, the author nor UNESCO-IHE for any damage to the property or persons as a result of operation or use of this publication and/or the information contained herein. A pdf version of this work will be made available as Open Access via http://repository.tudelft.nl/ihe This version is licensed under the Creative Commons Attribution-Non Commercial 4.0 International License, http://creativecommons.org/licenses/by-nc/4.0/Published by: CRC Press/Balkema PO Box 11320, 2301 EH Leiden, the Netherlands e-mail: Pub.NL@taylorandfrancis.com www.crcpress.com -www.taylorandfrancis.com to my dear family SummaryModelling urban flood dynamics requires detailed knowledge of a number of complex processes. Numerical simulation of flood propagation requires proper understanding of all processes involved. Also, special care has to be taken to adequately represent the urban topography, taking into account typical urban features like underpasses and hidden alleyways. Incorrect input data will affect the numerical model results, which may lead to inadequate flood-protection measures or even catastrophic flooding situations. This thesis explores how to include particular urban topographic features in urban flood modelling.Aerial Light Detection and Ranging (LiDAR) systems offer opportunities for achieving good quality topographic data, with less fieldwork on the ground. Even though aerial LiDAR data have long been used in many applications, conventional top-view LiDAR data can not quite capture some hidden urban features. However, recent improvements in Structure from Motion (SfM) techniques provide opportunities to achieve improved quality topographic data by using multiple viewpoints, including side-view data.This dissertation explores insights into the capabilities of assimilating SfM point cloud data by using multi-source views as input for enhancing 2D urban flood modelling. Side-view SfM point cloud data are collected and merged with conventional top-view LiDAR point cloud data to create novel Multi-Source Views (MSV) topographic data. The main objectives of this research are (i) to provide insight into the capabilities of using computer-based environments; (ii) to explore the benefits of using the new MSV data; (iii) to enhance 2D model schematizations; (iv) to compare simulated results using new MSV data and conventional top-view LiDAR data as input for urban flood models; and (v) to help developing flood-protection measures. Findings showed that simulation results using conventional top-view LiDAR-DSM as input show the least flood inundation areas and results contained many dry areas. This is because conventional LiDAR-DSM does not capture hidden urban features like underpasses, high trees, overarching structures, which behave as obstacles in 2D model schematics. When applying extended top-view LiDAR-DBM+ and the newly developed MSV-DEM as input, simulation results showed m...

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Section: Flood Watermark Extractionmentioning

confidence: 99%

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

Meesuk¹

2017

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“…During the last years, Europe experienced some of the most disastrous hydrogeological events from weather phenomena (European Environment Agency, 2001), including accelerated erosional soil degradation (Rebetez et al, 1997;Kömüscü, 1998;Martìnez-Casasnovas et al, 2002;De Luis et al, 2003), probably exacerbated by climate change that, over mid-latitude land areas, should be accompanied from an increase in atmosphere convective activity (Trenberth, 1999;Balling, Jr. and Cerveny, 2003). Rainstorms are very significant for soil hydrology in river-torrential environments and croplands, often exhibiting very high spatial variability (Bull et al, 2000;Gardner and Gerrard, 2003), and provoking high magnitude geomorphological processes and disastrous consequences in soil erosion (Coppus and Imeson, 2002;Renschler and Harbor, 2002).…”

Section: Introductionmentioning

confidence: 99%

Local models for rainstorm-induced hazard analysis on Mediterranean river-torrential geomorphological systems

Diodato

2004

Nat. Hazards Earth Syst. Sci.

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Abstract. Damaging hydrogeomorphological events are defined as one or more simultaneous phenomena (e.g. accelerated erosions, landslides, flash floods and river floods), occurring in a spatially and temporal random way and triggered by rainfall with different intensity and extent. The storm rainfall values are highly dependent on weather condition and relief. However, the impact of rainstorms in Mediterranean mountain environments depend mainly on climatic fluctuations in the short and long term, especially in rainfall quantity. An algorithm for the characterisation of this impact, called Rainfall Hazard Index (RHI), is developed with a less expensive methodology. In RHI modelling, we assume that the river-torrential system has adapted to the natural hydrological regime, and a sudden fluctuation in this regime, especially those exceeding thresholds for an acceptable range of flexibility, may have disastrous consequences for the mountain environment. RHI integrate two rainfall variables based upon storm depth current and historical data, both of a fixed duration, and a one-dimensionless parameter representative of the degree ecosystem flexibility. The approach was applied to a test site in the Benevento river-torrential landscape, Campania (Southern Italy). So, a database including data from 27 events which have occurred during an 77-year period ) was compared with Benevento-station RHI (24 h) , for a qualitative validation. Trends in RHIx for annual maximum storms of duration 1, 3 and 24 h were also examined. Little change is observed at the 3-and 24-h duration of a storm, but a significant increase results in hazard of a short and intense storm (RHIx (1 h) ), in agreement with a reduction in return period for extreme rainfall events.

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“…Mediterranean storms which generate floods in ephemeral streams are particularly intense (Bull, Kirkby, Shannon, & Hooke, 2000;Lana, Martínez, Serra, & Burgueño, 2004). A single event can double or triple the annual average and can frequently exceed 100 mm/h and reach maximums in excess of 355 mm/h in 5 min (Camarasa, Soriano, & López-García, 2010).…”

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confidence: 99%

“…A single event can double or triple the annual average and can frequently exceed 100 mm/h and reach maximums in excess of 355 mm/h in 5 min (Camarasa, Soriano, & López-García, 2010). Alongside the intensity of the rainfall, other factors (Bull et al, 2000;Greenbaum, Margalit, Shick, Sharon, & Baker, 1998) short lag times (Braken, Cox, & Shannon, 2008;Camarasa & Segura, 2001;Dick et al, 1997;Renard & Keppel, 1996).…”

mentioning

confidence: 99%

“…Finally, despite the fact that the hydrogeomorphological operation of these systems is well known (Bull et al, 2000;Hooke and Mant, 2000;Merrit & Wohl, 2003;Ortega & Garzón, 2009) the literature on modeling system dynamics is scarce (Servat, Najem, Leduc, & Shakeel, 2003). This shortage stems from a lack of quality, detailed hydrological data with which to analyze the processes and fit the models.…”

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confidence: 99%

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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)

Belmonte¹,

Soriano-García²

2012

Landscape and Urban Planning

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a b s t r a c tThis paper proposes a methodology for mapping flood risk in ephemeral streams, based on assessing flood hazards and global exposure. The method has been applied to the peri-urban area of Valencia, extended over the floodplains of the Barranco del Carraixet and Rambla de Poyo catchments. Hazard was assessed using hydrogeomorphological methods. Global exposure was estimated as a combination between the economic value of land use and human exposure, following a previous study carried out by Camarasa, A.M., López, M.J. and Soriano, J., 2011. Mapping temporally variable exposure to flooding in small Mediterranean basins using land-use indicators, Applied Geography 31 (19), 136-145. Synthesis mapping was elaborated to spatially rank flood risks, in terms of their hazard and exposure components. The method is simple, effective and easily comparable. The results reveal diverse risk configurations for each floodplain, even though both are in the vicinity of Valencia city (metropolitan area). This flood risk mapping method is very useful for land use planning because it enables swift diagnosis of the nature of risks and can supports decision making by risk managers and urban planners.

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The impact of rainstorms on floods in ephemeral channels in southeast Spain

Cited by 100 publications

References 7 publications

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

Point Cloud Data Fusion for Enhancing 2D Urban Flood Modelling

Local models for rainstorm-induced hazard analysis on Mediterranean river-torrential geomorphological systems

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

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