Development and calibration of two‐ and four‐wire water surface wave height measurement systems

1993 ◽  
Vol 93 (6) ◽  
pp. 3524-3524
Author(s):  
Robert Kerry Yarber
Keyword(s):  
Surface Wave ◽  
Wave Height ◽  
Water Surface ◽  
Height Measurement ◽  
Measurement Systems

scholarly journals The Close Relationship between Internal Wave and Ocean Free Surface Wave

2021 ◽  
Vol 9 (12) ◽  
pp. 1330
Author(s):  
Bang-Fuh Chen ◽  
Yi-Jei Huang
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Internal Wave ◽  
Surface Waves ◽  
Wave Height ◽  
Water Surface ◽  
Simple Method ◽  
Wave Signal ◽  
Close Relationship ◽  
Free Surface Wave

A numerical model was used to simulate the propagation of internal waves (IW) along the surface layer. The results show that strong water exchange during IW propagation results in strong free surface flow and produces small but distinct free surface waves. We found a close relationship between the internal and ocean surface waves. Our intuitive reaction is that by training the relationship between the water surface wave height and the internal wave waveform, the internal wave waveform can be reversed from the water surface wave height value. This paper intends to validate our intuition. The artificial neural network (ANN) method was used to train the Fluent simulated results, and then the trained ANN model was used to predict the inner waves below by the free surface wave signal. In addition, two linear internal wave equations (I and II) were derived, one based on the Archimedes principle and the other based on the long wave and Boussinesq approximation. The prediction by equation (II) was superior to the prediction of equation (I), which is independent of depth. The predicted IW of the proposed ANN method was in good agreement with the simulated results, and the predicted quality was much better than the two linear wave formulas. The proposed simple method can help researchers infer the magnitude of IW from the free surface wave signal. In the future, the spatial distribution of IW below the sea surface might be obtained by the proposed method without costly field investigation.

scholarly journals Surface Wave Measurements from Subsurface Floats

2015 ◽  
Vol 32 (4) ◽  
pp. 816-827 ◽  
Author(s):  
Eric D’Asaro
Keyword(s):  
Surface Wave ◽  
Pressure Gradient ◽  
Surface Waves ◽  
Wave Height ◽  
Vertical Motion ◽  
Sampling Interval ◽  
Height Measurement ◽  
Significant Wave ◽  
Wave Measurements ◽  
Wave Heights

AbstractPressure gradient measurements on a subsurface Lagrangian float are used to measure the spectrum of surface waves for 100 days of measurements at Ocean Weather Station Papa. Along Lagrangian trajectories of surface waves, the pressure is constant and the vertical pressure gradient fluctuations equal the Eulerian fluctuations at the mean float depth to second order in wave height. Measurement of the pressure difference between the top and the bottom of the float can thus be used to measure the waves. Corrections for the wave decay with depth, for the vertical motion of the float, for the finite sampling interval, and for the sampling noise (among others) are necessary to obtain accurate results. With these corrections, scalar spectra accurately match those from a nearby Waverider buoy for significant wave heights greater than about 3 m. For smaller wave heights, noise in the pressure measurements biases the float spectral measurements. Significant wave height is measured with an rms error of 0.37 m over the measured range of 1–9 m. This demonstrates that Lagrangian floats accurately follow the Lagrangian trajectories of surface waves. More detailed and quieter measurements of float motion could likely measure directional wave spectra from below the surface. Similar methods could be used to infer surface wave properties from other subsurface vehicles.

scholarly journals Wave Height Measurement by Analizing Image Data of the Water Surface Observed in Water

1993 ◽  
Vol 13 (Supplement1) ◽  
pp. 233-236
Author(s):  
Kazuhide Dan ◽  
Noriaki Yagi ◽  
Motoaki Yano
Keyword(s):  
Wave Height ◽  
Water Surface ◽  
Image Data ◽  
Height Measurement

Benchmarking three low-cost, low-maintenance cloud height measurement systems and ECMWF cloud heights against a ceilometer

Solar Energy ◽  
2018 ◽  
Vol 168 ◽  
pp. 140-152 ◽  
Author(s):  
P. Kuhn ◽  
M. Wirtz ◽  
N. Killius ◽  
S. Wilbert ◽  
J.L. Bosch ◽  
...  
Keyword(s):  
Low Cost ◽  
Height Measurement ◽  
Measurement Systems ◽  
Cloud Height

Influence of Water Surface Wave Disturbance on Wireless Optical Communication

2021 ◽  
Vol 41 (7) ◽  
pp. 0706005
Author(s):  
李军 Li Jun ◽  
罗江华 Luo Jianghua ◽  
元秀华 Yuan Xiuhua
Keyword(s):  
Surface Wave ◽  
Optical Communication ◽  
Water Surface ◽  
Wave Disturbance ◽  
Wireless Optical Communication ◽  
Influence Of Water

scholarly journals Experimental Study on 2D Motion Characteristics of Submerged Floating Tunnel in Waves

2020 ◽  
Vol 8 (2) ◽  
pp. 123 ◽  
Author(s):  
Zhiwen Yang ◽  
Jinzhao Li ◽  
Huaqing Zhang ◽  
Chunguang Yuan ◽  
Hua Yang
Keyword(s):  
Wave Height ◽  
Water Surface ◽  
Weight Ratio ◽  
Mooring Line ◽  
Natural Period ◽  
Main Challenge ◽  
Line Angle ◽  
Submerged Floating Tunnel ◽  
Motion Characteristics ◽  
The Stability

Submerged floating tunnel (SFT) is a new type of transportation infrastructure for crossing sea straits in relatively deeper water. Compared with the fixed tunnel, the main challenge in designing a SFT is the stability maintaining in a complex hydrodynamic environment, especially for the wave-induced dynamic load. In this study, a series of systematic experiments were conducted to investigate the 2D motion characteristics (i.e., heave, sway and roll) of the SFT exposed to regular waves. The movement of the SFT model is measured by the image processing method which is a noncontact measurement. The experimental observation of SFT motion during the process of wave and SFT interaction is described in detail, and the influence of several governing parameters is thoroughly analyzed, including the wave height and period, submergence depth, buoyancy to weight ratio (BWR), and the mooring line angle. The results show that the motion amplitudes of SFT increase with the wave height increasing. The effect of wave period is related to the natural period of the structure. The sway, heave and roll of the SFT submerged beneath the water surface are much smaller than that of the SFT on the water surface. With the increase of BWR, the motion of SFT decreases. The motion amplitude increases with mooring line angle increasing. Finally, empirical equations are proposed to estimate the motion characteristics of the SFT.

Wave-Height Map Extraction From Compact HF Surface-Wave Radar Network

2021 ◽  
Vol 18 (1) ◽  
pp. 77-81
Author(s):  
Zhen Tian ◽  
Yingwei Tian ◽  
Biyang Wen ◽  
Jiurui Zhao
Keyword(s):  
Surface Wave ◽  
Wave Height ◽  
Radar Network ◽  
Wave Radar ◽  
Hf Surface Wave Radar
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