| 规则波作用下刚性植物拖曳力系数实验研究 |
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| 引用本文： | 陈杰,何飞,蒋昌波,赵静.规则波作用下刚性植物拖曳力系数实验研究[J].水利学报,2017,48(7):846-857. |
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| 作者姓名： | 陈杰 何飞 蒋昌波 赵静 |
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| 作者单位： | 长沙理工大学 水利工程学院, 湖南 长沙 410114;水沙科学与水灾害防治湖南省重点实验室, 湖南 长沙 410114;长沙理工大学水科学与环境工程国际研究中心, 湖南 长沙 410114,长沙理工大学 水利工程学院, 湖南 长沙 410114,长沙理工大学 水利工程学院, 湖南 长沙 410114;水沙科学与水灾害防治湖南省重点实验室, 湖南 长沙 410114;长沙理工大学水科学与环境工程国际研究中心, 湖南 长沙 410114,长沙理工大学 水利工程学院, 湖南 长沙 410114 |
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| 基金项目： | 国家自然科学基金重点项目（51239001）；国家自然科学基金项目（51409022）；湖南教育厅科研资助项目（YB2015B034）；水利部水科学与水工程重点实验室开放研究基金项目（YK914013） |
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| 摘 要： | 植物的消波特性能有效防止波浪冲刷所造成的岸线侵蚀。在开展根茎叶共同作用下的刚性植物消波实验的基础上,采用Kobayashi和Dalrymple经验公式计算本实验植物模型的拖曳力系数,探究了拖曳力系数变化规律。通过对比分析两种经验公式计算所得的拖曳力系数,发现采用Kobayashi消波模型对于本实验中刚性植物消波模拟效果更好。根茎叶均在不同程度上对于植物消波特性产生影响。拖曳力系数与邱卡数、雷诺数、厄塞尔数及相对水深之间的关系依赖于植物淹没度。针对包含根茎叶的刚性植物,考虑植物摆动因素,对波能耗散方程中阻力项进行修正,提出改进的消波模型。
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| 关 键 词： | 刚性植物 拖曳力系数 消波模型 淹没度 |
| 收稿时间： | 2016/12/16 0:00:00 |
Experimental investigation on drag coefficient of rigid vegetation influenced by regular waves |
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| CHEN Jie,HE Fei,JIANG Changbo and ZHAO Jing.Experimental investigation on drag coefficient of rigid vegetation influenced by regular waves[J].Journal of Hydraulic Engineering,2017,48(7):846-857. |
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| Authors: | CHEN Jie HE Fei JIANG Changbo and ZHAO Jing |
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| Affiliation: | School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China;Key Laboratory of Water Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China;International Research Center of Water Science & Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China,School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China,School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China;Key Laboratory of Water Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China;International Research Center of Water Science & Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China and School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410114, China |
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| Abstract: | The coastal erosion problems caused by wave scouring can be solved by vegetation efficiently due to their function of wave damping. The experiments of wave attenuation by rigid vegetation were con-ducted in the flume, in which the effects of roots,stems and canopies were considered. The drag coefficient was computed by the formula of Kobayashi and Dalrymple and its variation was investigated. It can be found that the wave damping simulated by the Kobayashi model is better than that of Dalrymple by compar-ing the drag coefficients between the two formulas. Root, stem and canopy affect on wave dissipation at vary-ing degrees. The relationship between the drag coefficient and Keulegan-Carpenter number, Reynolds num-ber, Ursell number and relative water depth depends on submergence ratio. Finally, to obtain the model of rigid vegetation composed of root, stem and canopy, the term of drag force derived from the dissipation of energy equation has been modified involving swaying motion of plants. |
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| Keywords: | rigid vegetation drag coefficient wave attenuation model submergence ratio |
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