2015
DOI: 10.1007/s10652-015-9432-1
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Resistance and reconfiguration of natural flexible submerged vegetation in hydrodynamic river modelling

Abstract: In-stream submerged macrophytes have a complex morphology and several species are not rigid, but are flexible and reconfigure along with the major flow direction to avoid potential damage at high stream velocities. However, in numerical hydrodynamic models, they are often simplified to rigid sticks. In this study hydraulic resistance of vegetation is represented by an adapted bottom friction coefficient and is calculated using an existing two layer formulation for which the input parameters were adjusted to ac… Show more

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Cited by 36 publications
(36 citation statements)
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“…FathiMoghadam et al (2011) estimated the submerged vegetation roughness of flood plains with physical and numerical models. Verschoren et al (2016) developed a practical approach to quantify the resistance of submerged vegetation. It can be applied in 2D depth-averaged hydrodynamic models typically used in research.…”
Section: Resultsmentioning
confidence: 99%
“…FathiMoghadam et al (2011) estimated the submerged vegetation roughness of flood plains with physical and numerical models. Verschoren et al (2016) developed a practical approach to quantify the resistance of submerged vegetation. It can be applied in 2D depth-averaged hydrodynamic models typically used in research.…”
Section: Resultsmentioning
confidence: 99%
“…The effects of bed and vegetative roughness on flow velocity are represented by determining hydrodynamic roughness characteristics for each cover type separately using the Chézy coefficient, following the approach of Straatsma and Baptist () and Verschoren et al. ().…”
Section: Methodsmentioning
confidence: 99%
“…() to account for reconfiguration of flexible submerged macrophytes, to express vegetation resistance as:Cd=1Cb2+)(2g10.277778emDcAw+gkvlnhHvwhere C b is the Chézy roughness of the bed, g is acceleration due to gravity (9.81 m/s 2 ), D c is a species‐dependent drag coefficient, A w is the specific plant surface area (total wetted vertical surface area of the vegetation per unit horizontal surface area of the river (Sand‐Jensen , Verschoren et al. )), directly related to plant biomass P i , k v is the Von Kármàn constant (0.41), and H v is the deflected vegetation height (m). Deflected vegetation height varies as a function of incoming flow velocity, due to the high flexibility of submerged aquatic vegetation and reconfiguration at higher stream velocities (Sand‐Jensen , Schoelynck et al.…”
Section: Methodsmentioning
confidence: 99%
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“…Riparian and aquatic vegetation, depending on their structure, density, coverage, etc. can affect river morphology in different ways, by altering the flow and subsequently the sediment balance through hydraulic resistance [4][5][6]. Numerous studies have described the empirical relationships between biological and physical characteristics in aquatic ecosystems [7,8]; nonetheless, more quantitative understanding, linking current knowledge with predictive models is required [9].…”
Section: Introductionmentioning
confidence: 99%