3D numerical modelling of open-channel flow with submerged vegetation

Fischer-Antze, Tim; Stoesser, Thorsten; Bates, Paul; Olsen, Nils Reidar Bøe

doi:10.1080/00221680109499833

Cited by 160 publications

(95 citation statements)

References 7 publications

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“…These strong bed changes impose a relevant test for the numerical model. The observed results are in line with the general conclusions of the whole free flowing Danube River reach from Vienna to the Austrian-Slovakian border that was analyzed over a 10-year period [Fisher-Antze, 2005]. Also, over a longer time span, the bars remained at their positions and changes were observed only locally.…”

Section: Resultssupporting

confidence: 77%

“…Applying the model on a 180°laboratory bend [Fisher-Antze, 2005] showed that the parameter m is sensitive to changes. Figure 6 shows the results of the influence of parameter m on the computed bed changes.…”

Section: Parameter Sensitivity Analysismentioning

confidence: 99%

“…The fourth map shows results of an alternative consideration of vegetation effects on flow and finally on morphological changes. This approach introduced an additional source term in the Navier-Stokes equations to account for the additional drag induced by vegetation elements on the flow [Fischer-Antze et al, 2001]. Vegetation was then modeled by a number of vertical cylinders in each cell.…”

Section: Parameter Sensitivity Analysismentioning

confidence: 99%

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Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Fischer-Antze¹,

Olsen

Gutknecht

2008

Water Resources Research

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[1] The bed changes in a section of the river Danube were computed using a 3-D computational fluid dynamics model. A time series of discharges during the flood in 2002 was used. The results compared reasonably well with regular bed level surveys before and after the flood. The Danube River section was 6 km long and located between Vienna and the Austrian-Slovakian border. The fully three-dimensional numerical model solved the Navier-Stokes equations using the k-epsilon turbulence closure. Nonuniform sediment transport was computed using the formulas of Wu et al. (2000b), considering hidingexposure algorithms. Both bed deformation and sorting processes were calculated. A number of parameter sensitivity tests were carried out on roughness values, parameters in the sediment transport capacity formula, parameters in the hiding-exposure formulas, critical Shields number, and variations in the formulas for the effect of a sloping bed. Additionally, the sediment inflow to the section was varied together with investigations of physical parameters such as vegetation and groyne structures. The results were most sensitive to the Shields number for critical movement of the sediments. An error analysis was performed to give a quantitative assessment of the parameter sensitivity tests.

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Section: Resultssupporting

confidence: 77%

Section: Parameter Sensitivity Analysismentioning

confidence: 99%

Section: Parameter Sensitivity Analysismentioning

confidence: 99%

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Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Fischer-Antze¹,

Olsen

Gutknecht

2008

Water Resources Research

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“…Simulation tools are used for ecological studies (Hauer et al, 2008a,b) as well as for hydraulic engineering purposes such as river restoration and the like (Denoth, 2003;Gouda et al, 2002;Khan and Barkdoll, 2000;Fischer-Antze et al, 2001). Moreover, the precise delineation of endangered or vulnerable areas in flood hazard analysis is also based on hydrodynamic-numerical models (Habersack and Gaul, 2008).…”

Section: Introductionmentioning

confidence: 99%

Optimisation of LiDAR derived terrain models for river flow modelling

Mandlburger¹,

Hauer

Höfle

et al. 2009

Hydrol. Earth Syst. Sci.

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Abstract. Airborne LiDAR (Light Detection And Ranging) combines cost efficiency, high degree of automation, high point density of typically 1-10 points per m 2 and height accuracy of better than ±15 cm. For all these reasons Li-DAR is particularly suitable for deriving precise Digital Terrain Models (DTM) as geometric basis for hydrodynamicnumerical (HN) simulations. The application of LiDAR for river flow modelling requires a series of preprocessing steps. Terrain points have to be filtered and merged with river bed data, e.g. from echo sounding. Then, a smooth Digital Terrain Model of the Watercourse (DTM-W) needs to be derived, preferably considering the random measurement error during surface interpolation. In a subsequent step, a hydraulic computation mesh has to be constructed. Hydraulic simulation software is often restricted to a limited number of nodes and elements, thus, data reduction and data conditioning of the high resolution LiDAR DTM-W becomes necessary. We will present a DTM thinning approach based on adaptive TIN refinement which allows a very effective compression of the point data (more than 95% in flood plains and up to 90% in steep areas) while preserving the most relevant topographic features (height tolerance ±20 cm). Traditional hydraulic mesh generators focus primarily on physical aspects of the computation grid like aspect ratio, expansion ratio and angle criterion. They often neglect the detailed shape of the topography as provided by LiDAR data. In contrast, our approach considers both the high geometric resolution of Correspondence to: G. Mandlburger (gm@ipf.tuwien.ac.at) the LiDAR data and additional mesh quality parameters. It will be shown that the modelling results (flood extents, flow velocities, etc.) can vary remarkably by the availability of surface details. Thus, the inclusion of such geometric details in the hydraulic computation meshes is gaining importance in river flow modelling.

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“…The governing equations of FLOW-3D were validated for surface water flow [30,31]. The model uses the continuity and momentum equations as governing differential equations.…”

Section: Numerical Model Theory (The Flow-3d Model)mentioning

confidence: 99%

The Effect of Hydraulic Characteristics on Algal Bloom in an Artificial Seawater Canal: A Case Study in Songdo City, South Korea

Lee

Kim

et al. 2014

Water

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Algal blooms have threatened the environmental functions of artificial seawater canals. Generally, water quality in a canal is managed by periodically circulating water from the sea into the canal. However, hydraulic characteristics from the canal design can interrupt the removal of algal blooms by water circulations in the canal. Accordingly, this study analyzed the effect of the hydraulic characteristics on algal blooms in an artificial seawater channel in Central Park, New Songdo City, Korea using a 3-D hydrodynamic model. Nutrients and velocity in stagnant areas in the canal were spatio-temporally measured. Algal bloom locations based on field monitoring mainly corresponded with areas of stagnant water and high vorticity in the z-direction, as determined by the numerical simulations. These results support that high vorticity interrupts the transfer water to the outer area when the canal water is in a stagnant condition. A high value of z-direction vorticity resulted in increased nutrient (total nitrogen (T-N) and total phosphorus (T-P)) availability, and sequentially increases the probability of algal bloom events. In this regard, this study will give a contribution to prevention of algal blooms in the artificial seawater canal. OPEN ACCESSWater 2014, 6 400

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3D numerical modelling of open-channel flow with submerged vegetation

Cited by 160 publications

References 7 publications

Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Three‐dimensional CFD modeling of morphological bed changes in the Danube River

Optimisation of LiDAR derived terrain models for river flow modelling

The Effect of Hydraulic Characteristics on Algal Bloom in an Artificial Seawater Canal: A Case Study in Songdo City, South Korea

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