DIRECT MEASUREMENT OF WAVE-INDUCED BOTTOM SHEAR STRESS UNDER IRREGULAR WAVES
Wave-induced bottom shear stress is one of most important parameters in modelling of wave hydrodynamics and coastal sediment transport, but has not been accurately estimated so far.A new type of shear plate is developed to measure instantaneous wave bottom shear stress under both regular and irregular waves. The shear plate directly measures instantaneous horizontal force by applying the Wheatstone half bridge circuit to detect a tiny horizontal movement of the shear plate. The horizontal force was measured at a sampling rate of 10 Hz for about 10 minutes on one smooth bed and two rough beds, respectively. The measured total force consists of the wave-induced bottom shear stress and wave pressure gradient acting on the ends of the shear plate. The wave friction factors measured on the smooth bed are shown to agree well with the theoretical values derived in laminar flow, but those on the rough beds may be affected by the wave pressure gradient and bed roughness length estimated.
Shear plate bottom shear stress irregular wave significant wave
Zaijin You Baoshu Yin Guang Huo
Coastal Unit, Department of Environment and Climate Change PO Box 2185, Dangar NSW 2309 AUSTRALIA St Institute of Oceanology, Chinese Academy of Sciences Qingdao 266071, China State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering Hohai University, Nanji
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
1213-1218
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）