Incorporating river morphological changes to flood risk assessment: uncertainties, methodology and application

Neuhold, Clemens; Stanzel, Philipp; Nachtnebel, Hans Peter

doi:10.5194/nhess-9-789-2009

Cited by 58 publications

(56 citation statements)

References 12 publications

(8 reference statements)

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“…Flood hazards Correspondence to: G. Krapesch (gerald.krapesch@boku.ac.at) substantially affect the morphology of river systems in a very short time period (Hooke, 2008;Neuhold et al, 2009;Miller, 1990). Long term the lateral morphological changes, quantified by comparing the river width before and after the event (Zhang et al, 2009), can be determined as a characteristic feature for various river types (Bertoldi et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Scale orientated analysis of river width changes due to extreme flood hazards

Krapesch

Hauer

Habersack

2011

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper analyses the morphological effects of extreme floods (recurrence interval > 100 years) and examines which parameters best describe the width changes due to erosion based on 5 affected alpine gravel bed rivers in Austria. The research was based on vertical aerial photos of the rivers before and after extreme floods, hydrodynamic numerical models and cross sectional measurements supported by LiDAR data of the rivers. Average width ratios (width after/before the flood) were calculated and correlated with different hydraulic parameters (specific stream power, shear stress, flow area, specific discharge). Depending on the geomorphological boundary conditions of the different rivers, a mean width ratio between 1.12 (Lech River) and 3.45 (Trisanna River) was determined on the reach scale. The specific stream power (SSP) best predicted the mean width ratios of the rivers especially on the reach scale and sub reach scale. On the local scale more parameters have to be considered to define the "minimum morphological spatial demand of rivers", which is a crucial parameter for addressing and managing flood hazards and should be used in hazard zone plans and spatial planning.

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Section: Introductionmentioning

confidence: 99%

Scale orientated analysis of river width changes due to extreme flood hazards

Krapesch

Hauer

Habersack

2011

Nat. Hazards Earth Syst. Sci.

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“…The VMD river network is fluvially unstable (Reichel and Nachtnebel, 1994;Neuhold et al, 2009;MRC, 2010a) and the hydraulic nature of it is highly complex, impacted by both the upstream discharge and sea level along the East and West Seas. The East and West Seas have semidiurnal and diurnal tides, respectively (Nguyen and Savenije, 2006) (Fig.…”

Section: The Study Areamentioning

confidence: 99%

A study of the climate change impacts on fluvial flood propagation in the Vietnamese Mekong Delta

Văn

Popescu

Griensven

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. The present paper investigated the extent of the flood propagation in the Vietnamese Mekong Delta under different projected flood hydrographs, considering the 2000 flood event (the 20-yr return period event, T. V. H. as the basis for computation. The analysis herein was done to demonstrate the particular complexity of the flood dynamics, which was simulated by the 1-D modelling system ISIS used by the Mekong River Commission. The floods of the year 2050 are simulated using a projected sea level rise of +30 cm. The future flood hydrograph changes at Kratie, Cambodia, were also applied for the upstream boundary condition by using an adjusted regional climate model. Two future flood hydrographs were applied at the upstream part of the delta, the first one in a scenario of climate change without considering developments in the Mekong Basin,and the second one in a scenario of climate change taking into account future development of the delta. Analyses were done to identify the areas sensitive to floods, considering the uncertainty of the projection of both the upstream and downstream boundary conditions. In addition, due to the rice-dominated culture in the Vietnamese Mekong Delta, possible impacts of floods on the rice-based farming systems were also analysed.

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“…On the other hand, channel erosion-sedimentation processes may lead to topographical variations which may be significant 10 in the results obtained from the hydraulic modelling (Neuhold et al, 2009). As mentioned above, this channel was found to have high sediment mobility and therefore these processes, linked to a single event, may be significant.…”

Section: Limitations Of the Methods Usedmentioning

confidence: 99%

Hydrodynamic characterization of past flash-flood events and their associated hazards from dendrogeomorphological evidence in Caldera de Taburiente National Park (Canary Islands, Spain)

Garrote

Díez‐Herrero

Pozo

et al. 2016

Preprint

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Abstract. Las Angustias river is an ungauged stream located in theAlternative or complementary data sources and methods including palaeohydrological techniques can therefore be used here 20 for flood hazard analysis. A detailed dendrogeomorphological study of the river system was carried out using Canarian pine trees located on the stream bed and river bank with external evidence of flash-flood damage, including scars and exposed roots.The preliminary results identify and date at least eight winter flood events between 1962-1963 and 2011-12. In spite of the uncertainties deriving from the incomplete precipitation data and the mobile alluvial riverbed, the models provide an 25 estimate of past flood discharge magnitudes. E.g. for the 1997 flood event a 1235 m 3 ·s -1 flood minimizes the RMSE over the disturbed tree sample; furthermore, this flow value clearly exceeds the return period considered and means a distinct behavioral change in this gorge, from a braided channel with emerged bars to a single channel occupying the whole river bed. These numerical results and maps could improve flood hazard and risk analysis and should be useful for the national park land use management and visitors planning. 30Nat. Hazards Earth Syst. Sci. Discuss.,

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Incorporating river morphological changes to flood risk assessment: uncertainties, methodology and application

Cited by 58 publications

References 12 publications

Scale orientated analysis of river width changes due to extreme flood hazards

Scale orientated analysis of river width changes due to extreme flood hazards

A study of the climate change impacts on fluvial flood propagation in the Vietnamese Mekong Delta

Hydrodynamic characterization of past flash-flood events and their associated hazards from dendrogeomorphological evidence in Caldera de Taburiente National Park (Canary Islands, Spain)

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