A Coupled 1D-2D Hydrodynamic Model for Urban Flood Inundation

Fan, Yuyan; Ao, Tianqi; Yu, Haoping; Huang, Guoru; Li, Xiaodong

doi:10.1155/2017/2819308

Cited by 63 publications

(35 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…There is an increasing application of a storm risk management besides the mentioned classical flood risk management. In the last years several technical papers and authoritative guidelines were published to give recommendations on the procedure of storm hazard analysis and risk management (compare LAWA, 2018;Tyrna, Assmann, Fritsch, & Johann, 2017;LUBW, 2016;Fritsch, Assmann, & Tyrna, 2016;Assmann, Fritsch, & Jäger, 2012;Falconer et al, 2009). Apart from analyses based on Geographical Information Systems (GIS) of the digital elevation model (DEM), the key features of the storm risk management are again the 2D surface water models based on the 2D St. Venant equations.…”

Section: Motivation and Research Gapmentioning

confidence: 99%

Flood hazard analysis in small catchments: Comparison of hydrological and hydrodynamic approaches by the use of direct rainfall

David

Schmalz

2020

J Flood Risk Management

View full text Add to dashboard Cite

The classical 'decoupled' approach for fluvial flooding makes use of hydrographs as input boundary conditions. The catchment hydrology is determined by empirical semi-distributed rainfall-runoff models, the flood processes by the use of hydrodynamic models. However, for urban floods, the distributed rainfall is set directly as input ('direct rainfall modelling'-DRM) to the elements of the 2D model. This 'integrated approach' aims to include hydrological and hydraulic processes in one single model. In this study, both modelling approaches are applied and evaluated for their suitability to determine flood hazards in small, rural catchments. The resulting flood maps and flow hydrographs are compared for selected rainfall-runoff events in a catchment located in Central Germany. In the first approach, the hydrological model (HEC-HMS) from the Hydrologic Engineering Center (HEC) is used to generate the inflow boundary hydrographs for the 2D model (HEC-RAS), which is then used to simulate the flow variables for the river network and its floodplains. For the second approach, the DRM is applied over the whole catchment by the use of HEC-RAS. Special focus is given for the integrated approach to the difficulties occurring during the model optimisation and calibration. The comparison of the results and modelling processes of both approaches give insights into the advantages, disadvantages and difficulties or limitations of each presented approach. K E Y W O R D S direct rainfall modelling (DRM), flash flood, flood inundation modelling (FIM), HEC-RAS, hydraulic modelling, hydrological modelling, pluvial flooding, small catchments

show abstract

Section: Motivation and Research Gapmentioning

confidence: 99%

Flood hazard analysis in small catchments: Comparison of hydrological and hydrodynamic approaches by the use of direct rainfall

David

Schmalz

2020

J Flood Risk Management

View full text Add to dashboard Cite

show abstract

“…While this study provides a new idea of flood control, there are some caveats when the idea is applied in other regions. For one, MIKE 21 has high requirements for data; for tributaries and rivers, when simulating small-scale areas using the model, it needs a precise spatial resolution, whilst it is unable to predict elevation differences in floodplain modeling, which has its own significance in accurate results [54,55]. Second, there are some differences between the data obtained in the research area and the requirements of the model, and considering errors such as the generalization of the river network and grids as well as the changes in working conditions in the model, the verification of the one-dimensional model and the two-dimensional model is seemingly simple.…”

Section: Discussionmentioning

confidence: 99%

Small and Medium-Scale River Flood Controls in Highly Urbanized Areas: A Whole Region Perspective

Zengmei

Cai

Wang

et al. 2020

Water

View full text Add to dashboard Cite

While rapid urbanization promotes social and economic development, it poses a serious threat to the health of rivers, especially the small and medium-scale rivers. Flood control for small and medium-scale rivers in highly urbanized areas is particularly important. The purpose of this study is to explore the most effective flood control strategy for small and medium-scale rivers in highly urbanized areas. MIKE 11 and MIKE 21 were coupled with MIKE FLOOD model to simulate flooding with the flood control standard, after which the best flooding control scheme was determined from a whole region perspective (both the mainstream and tributary conditions were considered). The SheGong River basin located near the Guangzhou Baiyun international airport in Guangzhou city over south China was selected for the case study. The results showed that the flooding area in the basin of interest accounts for 42% of the total, with maximum inundation depth up to 0.93 m under the 20-year return period of the designed flood. The flood-prone areas are the midstream and downstream where urbanization is high; however the downstream of the adjacent TieShan River is still able to bear more flooding. Therefore, the probable cost-effective flood control scheme is to construct two new tributaries transferring floodwater in the mid- and downstream of the SheGong River into the downstream of the TieShan River. This infers that flood control for small and medium-scale rivers in highly urbanized areas should not simply consider tributary flood regimes but, rather, involve both tributary and mainstream flood characters from a whole region perspective.

show abstract

“…Most of coupled models use the 1D model in the river channel and 2D model in the floodplain to solve the river flood problem [2][3][4][5][11][12][13][14]. The other coupled models simulate urban drainage pipe network and river by 1D model and urban area by 2D model to solve the urban rain-flood problem [1,6,15,16]. To our knowledge, there is no precedent for applying the 1D-2D coupled model for the study of river closure in hydraulic engineering.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of River Closure Project

Lin

Jin

et al. 2020

Water

View full text Add to dashboard Cite

The success or failure of river closure is directly related to the construction period and project benefit. Therefore, it is very necessary to study the river closure by an appropriate method. In this paper, a 1D–2D coupled river closure model is established to optimize the closure flow rate, closure period, and layout of a real closure project. The 1D transition model between open channel flow and pressurized flow is established by a finite volume scheme. For the 2D model, 2D shallow water equations are solved using an unstructured finite volume scheme. The 1D model and 2D model are coupled by considering the mass and momentum conservation. To validate the model, a physical experiment of a real river closure project is set up according to the gravity similarity criterion with a scale of 1:80. Then, the experimental data obtained by the calibrated physical experiment is compared with the numerical results. Good agreements are achieved in terms of surface elevation, velocity, and flow rate. Finally, the real river closure project is further investigated by the model. The layout, closure flow rate and closure period of this project is analyzed and optimized. The original design of the berm is more suitable to discharge the flow. Moreover, the first stage cofferdam should be removed to floor elevation upstream and downstream of the dam. The river closure flow rate should not exceed 2380 m3/s.

show abstract

A Coupled 1D-2D Hydrodynamic Model for Urban Flood Inundation

Cited by 63 publications

References 19 publications

Flood hazard analysis in small catchments: Comparison of hydrological and hydrodynamic approaches by the use of direct rainfall

Flood hazard analysis in small catchments: Comparison of hydrological and hydrodynamic approaches by the use of direct rainfall

Small and Medium-Scale River Flood Controls in Highly Urbanized Areas: A Whole Region Perspective

Experimental and Numerical Investigation of River Closure Project

Contact Info

Product

Resources

About