scholarly journals Errors of Airborne Bathymetry LiDAR Detection Caused by Ocean Waves and Dimension-Based Laser Incidence Correction

2021 ◽  
Vol 13 (9) ◽  
pp. 1750
Author(s):  
Kai Guo ◽  
Qingquan Li ◽  
Qingzhou Mao ◽  
Chisheng Wang ◽  
Jiasong Zhu ◽  
...  

Ocean waves are a vital environmental factor that affects the accuracy of airborne laser bathymetry (ALB) systems. As the regional water surface undulates with randomness, the laser propagation direction through the air–water surface will change and impact the underwater topographic result from the ALB system, especially for the small laser divergence system. However, the natural ocean surface changes rapidly over time, and uneven ocean surface point clouds from ALB scanning will cause an uncertain estimation of the laser propagation direction; therefore, a self-adaptive correction method based on the characteristics of the partial wave surface is key to improving the accuracy and applicability of the ALB system. In this paper, we focused on the issues of spatial position deviation caused by surface waves and position correction of the underwater laser footprint, and the dimension-based adaptive method is applied to attempt to correct the laser incidence angle. Simulation experiments and analysis of the actual measurement data from different ALB systems verified that the method can effectively suppress the influence of ocean waves. Furthermore, the inversion result of sea surface inclination changes is consistent with the surface wind wave reanalysis products. Based on the laser underwater propagation model in the strategy, we also quantitatively analyzed the influence of surface waves on laser bathymetry, which can guide the operation selection and data processing of the ALB system at specific water depths and under dynamic ocean conditions.

Geophysics ◽  
2012 ◽  
Vol 77 (1) ◽  
pp. E1-E8 ◽  
Author(s):  
Endre Håland ◽  
Eirik G. Flekkøy ◽  
Knut Jørgen Måløy

The natural E-field variations measured at the sea bottom, and the magnitude of the different field components compared in the light of the theory for induction caused by ocean surface waves. At shallow sea depths of 107–122 meters only the vertical component carries an observable effect of ocean waves, whereas the horizontal field is dominated by the larger magnetotelluric noise. This agrees well with theoretical predictions.


2020 ◽  
Author(s):  
Chen Chen ◽  
Kenji Sasa ◽  
Takaaki Mizojiri

Abstract. The analysis of ocean surface waves are essential to ensure a safe and economical navigation. Since 2010, different onboard observation data from a bulk carrier have been colledted for 6 years, including high-risk shipping regions in the Southern Hemisphere with strong ocean currents. For four rough sea cases, high-resolution numerical simulations of ocean waves, including the effect of wave-current interaction on ship navigation, have been performed using the WAVEWATCH III model. The simulations considered the ocean surface wind force from the widely used grid point value database NCEP-FNL and ERA-Interim. Aimed at providing practical suggestions for safe navigation by avoiding possible high-risk ocean regions as well as the construction of a more effective and efficient optimum ship routing system, the model results were validated based on onboard observations, followed by discussions on the responses of ship motion and navigation to wave states at different levels. Finally, identification of the early warning criteria, including various operational ocean parameters, is provided for ballast and loaded ships sailing in rough seas.


2014 ◽  
Author(s):  
James M. Kaihatu ◽  
Alexandru Sheremet ◽  
Jame M. Smith ◽  
Hendrik L. Tolman

AIP Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 015336
Author(s):  
Jia-Yi Zhang ◽  
Ting Liu ◽  
Jia Tao ◽  
Ya-Xian Fan ◽  
Zhi-Yong Tao
Keyword(s):  

2020 ◽  
Vol 12 (2) ◽  
pp. 155-164
Author(s):  
He Fang ◽  
William Perrie ◽  
Gaofeng Fan ◽  
Tao Xie ◽  
Jingsong Yang

1995 ◽  
Vol 18 (6) ◽  
pp. 438-444 ◽  
Author(s):  
P. Bonmarin ◽  
F. Bartholin ◽  
A. Ramamonjiarisoa

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