Hydrological characteristics of vegetated river flows: a laboratory flume study |
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| Authors: | John Z Shi Yan-Hong Li Jocelyne MR Hughes Ming Zhao |
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| Institution: | 1. Department of Harbour and Coastal Engineering, Institute of Harbour and Hydraulic Engineering, State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, 1954 Hua Shan Road , Shanghai , 200030 , China E-mail: zshi@sjtu.edu.cn;2. Currently visiting: Department of Applied Mathematics and Theoretical Physics , University of Cambridge, Wilberforce Road , Cambridge , CB3 0WA , UK zshi@sjtu.edu.cn;4. Department of Harbour and Coastal Engineering, Institute of Harbour and Hydraulic Engineering, State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, 1954 Hua Shan Road , Shanghai , 200030 , China E-mail: zshi@sjtu.edu.cn;5. Oxford Water , Oxford University Centre for the Environment , Dyson Perrins Building E-mail: jocelyne.hughes@conted.ox.ac.uk |
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| Abstract: | Abstract Laboratory flume experiments were undertaken to measure the vertical profiles of mean flow velocity for three different flow discharges and four different stem densities of Hydrilla verticillata. The data were used to calculate three parameters, namely Manning's roughness coefficient, the Reynolds number and the Froude number. In addition, empirical equations were obtained for the vertical distribution of measured flow velocity within the transitional zone and above the plant canopy. The results show that: (a) the vertical distribution of measured flow velocity exhibits three zone profiles; (b) Manning's roughness coefficient decreases with increasing depth-averaged flow velocity; (c) the relationship between Manning's roughness coefficient and the depth-averaged flow velocity is within the smooth left inverse curve; (d) Manning's roughness coefficient significantly changes with increasing density of Hydrilla; (e) the Froude number is independent of the density of Hydrilla; and (f) both the Reynolds number and the Froude number increase with increasing depth-averaged flow velocity. Citation Shi, J.Z., Li, Y.-H., Hughes, J.M.R., and Zhao, M., 2013. Hydrological characteristics of vegetated river flows: a laboratory flume study. Hydrological Sciences Journal, 58 (5), 1047–1058. Editor Z.W. Kundzewicz |
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| Keywords: | mean flow velocities Manning's roughness coefficient Reynolds number Froude number Hydrilla verticillata laboratory flume |
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