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

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.

Study on Monitoring Water Surface in Poyang Lake by MODIS Image

2013 ◽  
Vol 303-306 ◽  
pp. 744-747
Author(s):  
Xing Hua Le ◽  
Mei Ying Wan ◽  
Zhe Wen Fan ◽  
Yu Fang ◽  
Ling Quang Huang
Keyword(s):  
Lake Water ◽  
Water Surface ◽  
Poyang Lake ◽  
Image Data ◽  
Water Monitoring ◽  
Surface Information ◽  
Resolution Image ◽  
Monitoring Time ◽  
Modis Image

. In the paper, we use med-resolution image data-MODIS to monitor Poyang Lake water surface. The resolution of images is 250 meters. The cycle of the monitoring frequence is 8 days. The monitoring time is from Jan, 1st to June, 25th, 2012. We select water surface in the embankment of Poyang Lake as the research object. The results show that Modis image can extracte water surface information quickly for water monitoring in time. The technology can be supplied to trail the change of Poyang Lake eco-system frequently.

Ocean wave height measurement with SEASAT SAR using speckle diversity

1982 ◽  
Vol 7 (2) ◽  
pp. 103-107 ◽  
Author(s):  
A. Jain ◽  
G. Medlin ◽  
C. Wu
Keyword(s):  
Wave Height ◽  
Ocean Wave ◽  
Height Measurement

Experimental Research on a Pump Suction Sump With Improved Structure

2005 ◽  
Author(s):  
Yi Fan ◽  
Shuhong Liu ◽  
Yulin Wu ◽  
Yong Li ◽  
Zhaofeng Xu
Keyword(s):  
Water Depth ◽  
Water Surface ◽  
Free Water ◽  
Air Entrainment ◽  
Critical Flow ◽  
Height Measurement ◽  
Critical Flow Rate ◽  
Pumping System ◽  
Pump Station ◽  
Pump Sump

Pump suction sump is an important part of pump station and its flow situations influence the performance of pumping system greatly. In this paper, the pump suction sump with particular structure is designed to improve the flow situations near the pump intake. In order to validate the effect of the improved structure, three experiments were carried out on both the original and improved structures, including the experiment of critical flow rate for air entrainment, the experiment of free water surface height measurement, and 3D PIV experiments at the pump sump. The results of the experiments show that water depth and inlet flow velocity influence the flow situations greatly. The results also show that the improved structure is useful to improve flow situations in pump suction sump.

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