A hydro-sedimentary modeling system for flash flood propagation and hazard estimation under different agricultural practices

Kourgialas, Nektarios N.; Karatzas, George P.

doi:10.5194/nhess-14-625-2014

Cited by 26 publications

(15 citation statements)

References 21 publications

(29 reference statements)

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“…The resolution of the cohesive sediment transport module requires outputs from the hydrodynamics module, namely water discharge, water level, cross-sectional area and hydraulic radius, and calibrated specific parameters (critical shear stress for erosion, critical shear stress for deposition, erodibility). This cohesive sediment transport module associated with MIKE11 has been successfully applied to sediment transport studies by, e.g., Neary et al (2001), EtemadShahidi et al (2010) and Kourgialas and Karatzas (2014).…”

Section: The Cohesive Sediment Transport Modulementioning

confidence: 99%

Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta

Vinh¹,

Ouillon

Thạnh³

et al. 2014

Hydrol. Earth Syst. Sci.

104

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Abstract. The Hoa Binh dam (HBD), located on a tributary of the Red River in Vietnam, has a capacity of 9.45 × 10 9 m 3 and was commissioned in December 1988. Although it is important for flood prevention, electricity production and irrigation in northern Vietnam, the Hoa Binh dam has also highly influenced the suspended sediment distribution in the lower Red River basin, in the delta and in the coastal zone. Its impact was analysed from a 50-year data set of water discharge and suspended sediment concentration , and the distribution of water and sediment across the nine mouths of the delta was simulated using the MIKE11 numerical model before and after the dam settlement. Although water discharge at the delta inlet decreased by only 9 %, the yearly suspended sediment flux dropped, on average, by 61 % at Son Tay near Hanoi (from 119 to 46 × 10 6 t yr −1 ). Along the coast, reduced sedimentation rates are coincident with the lower sediment delivery observed since the impoundment of the Hoa Binh dam. Water regulation has led to decreased water discharge in the wet season (−14 % in the Red River at Son Tay) and increased water discharge in the dry season (+12 % at the same station). The ratios of water and suspended sediment flows, as compared to the total flows in the nine mouths, increased in the northern and southern estuaries and decreased in the central, main Ba Lat mouth. The increasing volume of dredged sediments in the Haiphong harbour is evidence of the silting up of the northern estuary of Cam-Bach Dang. The effect of tidal pumping on enhanced flow occurring in the dry season and resulting from changed water regulation is discussed as a possible cause of the enhanced siltation of the estuary after Hoa Binh dam impoundment.

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Section: The Cohesive Sediment Transport Modulementioning

confidence: 99%

Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta

Vinh¹,

Ouillon

Thạnh³

et al. 2014

Hydrol. Earth Syst. Sci.

104

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“…One dimensional (1-D) hydraulic models are the most common method for flood simulation and flood inundation mapping because of their simplicity, least amount of input data and low computational power (e.g. Pappenberger et al, 2005;Kourgialas and Karatzas, 2014;Teng et al, 2017). Furthermore, two dimensional (2-D) hydrodynamic models have been applied in recent studies, due to improvements on model structure and on model parameter estimation methods (Cook and Merwade, 2009;Tsakiris and Bellos, 2014;Costabile and Macchione, 2015;Shen et al, 2015;Teng et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Probabilistic flood inundation mapping at ungauged streams due to roughness coefficient uncertainty in hydraulic modelling

et al. 2017

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Abstract. Probabilistic flood inundation mapping is performed and analysed at the ungauged Xerias stream reach, Volos, Greece. The study evaluates the uncertainty introduced by the roughness coefficient values on hydraulic models in flood inundation modelling and mapping. The wellestablished one-dimensional (1-D) hydraulic model, HEC-RAS is selected and linked to Monte-Carlo simulations of hydraulic roughness. Terrestrial Laser Scanner data have been used to produce a high quality DEM for input data uncertainty minimisation and to improve determination accuracy on stream channel topography required by the hydraulic model. Initial Manning's n roughness coefficient values are based on pebble count field surveys and empirical formulas. Various theoretical probability distributions are fitted and evaluated on their accuracy to represent the estimated roughness values. Finally, Latin Hypercube Sampling has been used for generation of different sets of Manning roughness values and flood inundation probability maps have been created with the use of Monte Carlo simulations. Historical flood extent data, from an extreme historical flash flood event, are used for validation of the method. The calibration process is based on a binary wet-dry reasoning with the use of Median Absolute Percentage Error evaluation metric. The results show that the proposed procedure supports probabilistic flood hazard mapping at ungauged rivers and provides water resources managers with valuable information for planning and implementing flood risk mitigation strategies.

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“…Rainfall-runoff and hydraulic models have commonly been used to characterize the probability of occurrence and the impacts of floods (e.g., [40]). This involves simulating riverine floods associated with precipitation events of different return periods (T), and route them in a hydraulic model.…”

Section: Flood Hazardmentioning

confidence: 99%

From Multi-Risk Evaluation to Resilience Planning: The Case of Central Chilean Coastal Cities

Barría

Cruzat

Cienfuegos

et al. 2019

Water

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Multi-hazard evaluations are fundamental inputs for disaster risk management plans and the implementation of resilient urban environments, adapted to extreme natural events. Risk assessments from natural hazards have been typically restricted to the analysis of single hazards or focused on the vulnerability of specific targets, which might result in an underestimation of the risk level. This study presents a practical and effective methodology applied to two Chilean coastal cities to characterize risk in data-poor regions, which integrates multi-hazard and multi-vulnerability analyses through physically-based models and easily accessible data. A matrix approach was used to cross the degree of exposure to floods, landslides, tsunamis, and earthquakes hazards, and two dimensions of vulnerability (physical, socio-economical). This information is used to provide the guidelines to lead the development of resilience thinking and disaster risk management in Chile years after the major and destructive 2010 Mw8.8 earthquake.

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A hydro-sedimentary modeling system for flash flood propagation and hazard estimation under different agricultural practices

Cited by 26 publications

References 21 publications

Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta

Impact of the Hoa Binh dam (Vietnam) on water and sediment budgets in the Red River basin and delta

Probabilistic flood inundation mapping at ungauged streams due to roughness coefficient uncertainty in hydraulic modelling

From Multi-Risk Evaluation to Resilience Planning: The Case of Central Chilean Coastal Cities

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