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原文传递 Semianalytical Model of Depth-Integrated Vegetal Drag Force Based on Stokes Second-Order Wave Theory

题名：	Semianalytical Model of Depth-Integrated Vegetal Drag Force Based on Stokes Second-Order Wave Theory
正文语种：	英文
作者：	Ling Zhu, A.M.ASCE1; Qin Chen, M.ASCE2; Yan Ding, M.ASCE3; Navid Jafari, M.ASCE4; Julie D. Rosati, M.ASCE5
作者单位：	1Associate Research Scientist, Dept. of Civil and Environmental Engineering, Northeastern Univ., 400 Snell Engineering Center, 360 Huntington Ave., Boston, MA 02115. 2Professor, Dept. of Civil and Environmental Engineering and Dept. of Marine and Environmental Sciences, Northeastern Univ., 471 Snell Engineering Center, 360 Huntington Ave., Boston, MA 02115 (corresponding author). 3Research Civil Engineer (Hydraulics), Coastal and Hydraulics Laboratory, Engineer Research and Development Center, USACE, 3909 Halls Ferry Rd., Vicksburg, MS 39180. 4Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., 3212D Patrick F. Taylor Hall, Baton Rouge, LA 70803. 5Technical Director, Flood & Coastal Systems R&D, Coastal & Hydraulics Laboratory, Engineer Research & Development Center, USACE, 441 G Street NW, 3W08, Washington, DC 20314.
关键词：	Phase-averaged drag force; Bending moment; Bending stress; Stem breakage; Wave setup/setdown; Wave–vegetation interaction
摘要：	The phase-averaged depth-integrated vegetal drag force (Fv) directly impacts the mean water level (MWL) change in vegetation. Evaluated from linear wave theory, Fv integrated along the submerged part of vegetation becomes zero due to the symmetric profile of horizontal velocity. In this study, a semianalytical model for estimating Fv on vegetation stems exposed to Stokes waves is developed based on Stokes second-order wave theory (STK). By assuming a narrow-banded wave spectral density and Rayleigh-distributed wave heights, the proposed model can be applied to random waves. STK-based formulas of the maximum depth-integrated vegetal drag force, bending moment, and bending stress are provided to assess the breakage of vegetation stems. Moreover, by taking the solutions from the stream function wave theory as references, the applicable ranges of the STK-based semianalytical model of Fv and drag-induced bending moment are determined.
出版年：	2019
期刊名称：	Journal of Waterway, Port, Coastal, and Ocean Engineering
卷：	145
期：	2
页码：	1-13