A rapid assessment method for calculating the drag coefficient in wave attenuation by vegetation |
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| Authors: | Zhilin Zhang Bensheng Huang Hongxiang Ji Xin Tian Jing Qiu Chao Tan Xiangju Cheng |
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| Institution: | Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510630, China;State and Local Joint Engineering Laboratory of Estuarine and Hydraulic Technology, Guangzhou 510630, China;Guangdong Key Laboratory of Hydrodynamic Research, Guangzhou 510630, China;Technical Research Center of Guangdong-Hong Kong-Macao Greater Bay Area's Water Safety Guarantee, Guangzhou 510630, China;Department of Water Management, Delft University of Technology, Delft 2628 CN, the Netherlands;School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | Vegetation in wetlands is a large-scale nature-based resource that can provide multiple benefits to human beings and the environment,such as wave attenuation in coastal zones.Traditionally,there are two main calibration approaches to calculate the attenuation of wave driven by vegetation.The first method is a straightforward one based on the exponential attenuation of wave height in the direction of wave transmission,which,however,overlooks the crucial drag coefficient (C_D).The other method is in accordance with more complicate equations for predicting the damping factor,which is regarded as a function of C_D.In this study,a new relation,combining these above two conventional approaches,is proposed to predict the C_D in an operative approach.Results show that values yielded by the new assessment method perform a strong linear relationship with a collection of historical observations,with a promising R~2 value of 0.90.Besides,the linear regression derives a new predictive equation for the bulk drag coefficient.Additionally,a calibrated value of 4 for the empirical plant drag coefficient(C_P) is revealed.Overall,this new equation,with the superiority of the convenient exponential regression,is expected to be a rapid assessment method for calculating wave attenuation by vegetation and predicting the drag coefficient. |
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| Keywords: | wave attenuation by vegetation nature-based coast drag coefficient empirical validation |
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