A simple 2-D inundation model for incorporating flood damage in urban drainage planning

Pathirana, Assela; Tsegaye, Seneshaw; Gersonius, Berry; Vairavamoorthy, Kalanithy

doi:10.5194/hess-15-2747-2011

Cited by 31 publications

(15 citation statements)

References 8 publications

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“…When water begins to overflow it becomes a 2D phenomenon and the use of a 2D model is more suitable. Thus, 2D numerical models were successfully applied for flood modelling [14][15][16]; the discharge is used as upstream boundary condition of the main river channel and then a 2D simulation is performed. Nowadays there is a wide availability of numerical models with different capabilities and from different developers; some models are free while others require the purchase of a licence.…”

Section: Introductionmentioning

confidence: 99%

Application of 2D numerical simulation for the analysis of the February 2014 Bolivian Amazonia flood: Application of the new HEC-RAS version 5

Quirogaa

Kurea

Udoa

et al. 2016

Ribagua

192

111

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a b s t r a c tLlanos de Moxos are vast plains in the Bolivian Amazonia that are continually flooded by the Mamore river. The flood lasts for several days affecting important cities like Trinidad, drowning people, drowning cattle and swamping arable land. Because of the cloudy skies, remote sensing observations are limited to some areas and few days. Thus, there is huge uncertainty about characteristics of flood events and possible consequences. Two-dimensional (2D) numerical simulation proved to be an important tool for understanding flood events. The HEC-RAS model is one of the most popular hydraulic models. In 2014 a new version of HEC-RAS (HEC-RAS-v5) was released including 2D capabilities. The present study applied the new HEC-RAS-v5 to simulate the February 2014 flood event in the Bolivian Amazonia. The flood simulated shows good performance when compared with satellite image of the flood event. In addition, the simulation provides information like water depth, flow velocity and a temporal variation of the flood. Specific locations where water begins to overflow were identified. Over most of the flooded area the water velocity is lower than 0.25 m s −1 . During first ten days of the flood the flood extent increases rapidly. The flood depth allows identifying areas exposed to different hazard levels. The west plain of the Mamore river is the most exposed to the flood; it shows bigger flood extent, longer flood duration and deeper water depth. The flood that threatens the city of Trinidad originates in two locations; one located 32 km at the north and other located 10 km at the south west. The flood from the north gets close to Trinidad twelve days after it begins to overflow, while the flood from the south gets close to Trinidad seven days after it begins to overflow. Although the flood from the north is deeper than the flood from the south, the flood from the south begins flooded before the north. Thus, water borne and vector borne diseases may originate at the south earlier than the north. The city of San Javier gets covered by flood five days after the water begins to overflow. The study shows the applicability and the value of the 2D capabilities of the new HEC-RAS for flood studies. Llanos de Moxos son planicies de inundación en la Amazonia Boliviana que constantemente son inundadas por el río Mamore. Las inundaciones se prolongan durante varios días afectando importantes ciudades como Trinidad, ahogando gente, ahogando ganado e inundando cultivos. La visibilidad de imá-genes satelitales se ve limitada debido a la nubosidad. Por tal motivo se tiene un gran desconocimiento sobre las características de la inundación y sus posibles consecuencias. Simulación numérica bidimensional (2D) es una importante herramienta para simular y analizar inundaciones. El modelo HEC-RAS es * Corresponding author. uno de los más populares modelos hidráulicos. En octubre de 2014 la última versión de HEC-RAS versión 5 fue publicada con capacidades 2D. El presente estudio aplicó el nuevo HEC-RAS versión 5 para simular la inund...

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Section: Introductionmentioning

confidence: 99%

Application of 2D numerical simulation for the analysis of the February 2014 Bolivian Amazonia flood: Application of the new HEC-RAS version 5

Quirogaa

Kurea

Udoa

et al. 2016

Ribagua

192

111

View full text Add to dashboard Cite

show abstract

“…Previous studies have shown that urban catchments, characterised by a fast hydrological response due to both low interception and infiltration, are highly sensitive to small-scale spatial and temporal variability of the precipitation field (Bell and Moore, 2000;Einfalt et al, 2004;Gires et al, 2013) In the past, a lot of studies have addressed requirements and approaches for flood modelling (Schmitt et al, 2004;Balmforth and Dibben, 2006;Parker et al, 2011;Pathirana et al, 2011;Priest et al, 2011;Neal et al, 2012;Ozdemir et al, 2013). More recently, studies have shown the impact of rainfall variability on hydrodynamic models outputs (Gires et al, 2012;Liguori et al, 2012;Vieux and Imgarten, 2012).…”

Section: Introductionmentioning

confidence: 99%

On the sensitivity of urban hydrodynamic modelling to rainfall spatial and temporal resolution

Bruni

Reinoso

Giesen

et al. 2015

Hydrol. Earth Syst. Sci.

121

109

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Abstract. Cities are increasingly vulnerable to floods generated by intense rainfall, because of urbanisation of floodprone areas and ongoing urban densification. Accurate information of convective storm characteristics at high spatial and temporal resolution is a crucial input for urban hydrological models to be able to simulate fast runoff processes and enhance flood prediction in cities. In this paper, a detailed study of the sensitivity of urban hydrodynamic response to high resolution radar rainfall was conducted. Rainfall rates derived from X-band dual polarimetric weather radar were used as input into a detailed hydrodynamic sewer model for an urban catchment in the city of Rotterdam, the Netherlands. The aim was to characterise how the effect of space and time aggregation on rainfall structure affects hydrodynamic modelling of urban catchments, for resolutions ranging from 100 to 2000 m and from 1 to 10 min. Dimensionless parameters were derived to compare results between different storm conditions and to describe the effect of rainfall spatial resolution in relation to storm characteristics and hydrodynamic model properties: rainfall sampling number (rainfall resolution vs. storm size), catchment sampling number (rainfall resolution vs. catchment size), runoff and sewer sampling number (rainfall resolution vs. runoff and sewer model resolution respectively).Results show that for rainfall resolution lower than half the catchment size, rainfall volumes mean and standard deviations decrease as a result of smoothing of rainfall gradients. Moreover, deviations in maximum water depths, from 10 to 30 % depending on the storm, occurred for rainfall resolution close to storm size, as a result of rainfall aggregation. Model results also showed that modelled runoff peaks are more sensitive to rainfall resolution than maximum insewer water depths as flow routing has a damping effect on in-sewer water level variations. Temporal resolution aggregation of rainfall inputs led to increase in de-correlation lengths and resulted in time shift in modelled flow peaks by several minutes. Sensitivity to temporal resolution of rainfall inputs was low compared to spatial resolution, for the storms analysed in this study.

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“…Furthermore, cost-benefit analysis could be considered, but this would require damage assessment (cf. Pathirana et al, 2011;Jonkman et al, 2008).…”

Section: Discussionmentioning

confidence: 97%

Impacts of rainfall variability and expected rainfall changes on cost-effective adaptation of water systems to climate change

Pol

Ierland

Gabbert

et al. 2015

Journal of Environmental Management

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A simple 2-D inundation model for incorporating flood damage in urban drainage planning

Cited by 31 publications

References 8 publications

Application of 2D numerical simulation for the analysis of the February 2014 Bolivian Amazonia flood: Application of the new HEC-RAS version 5

Application of 2D numerical simulation for the analysis of the February 2014 Bolivian Amazonia flood: Application of the new HEC-RAS version 5

On the sensitivity of urban hydrodynamic modelling to rainfall spatial and temporal resolution

Impacts of rainfall variability and expected rainfall changes on cost-effective adaptation of water systems to climate change

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