Study of the relationship between non-dimensional roughness length and wave age, effected by wave directionality |
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| Authors: | Naoya Suzuki Naoto Ebuchi Chaofang Zhao Isao Watabe Yasuhiro Sugimori |
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| Institution: | (1) Center for Environmental Remote Sensing (CEReS), Chiba University, 1-33 Yayoi Inage, 263-8522 Chiba, Japan;(2) Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University, Aoba, 980-8578 Sendai, Japan;(3) Ocean Remote Sensing Laboratory, Ocean University of Qingdao, China;(4) National Research Institute for Earth Science and Disaster Prevention, Science and Technology Agency, 9-2 Nijigahama, Hiratsuka, 254-0823 Kanagawa, Japan |
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| Abstract: | Relationship between the non-dimensional roughness length and inverse of wave age has been discussed without consideration
of wave directions, though wind wave field consists of various directional component waves. In this study we observe wave
heights by an array of four wave gauges at the Hiratsuka Tower of (Independent Administrative Institution) National Research
Institute for Earth Science and Disaster Prevention (NIED), Japan, and discuss the effect of wave directionality. As a result,
the data sets were classified into two different groups according to the directional wave spectrum distribution. In case 1
only swell and wind waves exist and in case 2 there exist wave components from several directions. It is shown that the case
of multiple-directional component waves (case 2) may affect the non-dimensional roughness length and friction velocity. |
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| Keywords: | Wind wave roughness length wave age |
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