scholarly journals Wave pattern induced by a moving atmospheric pressure disturbance

2015 ◽  
Vol 52 ◽  
pp. 37-42 ◽  
Author(s):  
Xiaojing Niu ◽  
Haojie Zhou
Keyword(s):  
Atmospheric Pressure ◽  
Wave Pattern ◽  
Pressure Disturbance

scholarly journals EDGE WAVE INDUCED BY AN ATMOSPHERIC PRESSURE DISTURBANCE MOVING ALONG A SLOPING BEACH

2018 ◽  
pp. 82
Author(s):  
Yixiang Chen ◽  
Xiaojing Niu
Keyword(s):  
Shallow Water Equations ◽  
Atmospheric Pressure ◽  
Edge Wave ◽  
Edge Waves ◽  
Translation Speed ◽  
Pressure Disturbance ◽  
Significant Edge ◽  
Spatial Size ◽  
Sloping Beach ◽  
Wave Induced

Edge wave can be generated by an atmospheric pressure disturbance moving along the shoreline on a sloping beach. A two-dimensional numerical model based on non-linear shallow water equations is established and a set of numerical experiments are conducted to study the edge wave packets evolution in coastal ocean. In light of the analytical solutions by Greenspan, some dominant factors are discussed, such as disturbance spatial size, translation speed, its location and the slope inclination, that influence the generation conditions and evolution process of edge waves. The results indicate on what circumstances significant edge waves will be excited and how long it takes for the wave growth.

scholarly journals STUDY ON THE PROUDMAN RESONANCE OF WAVES INDUCED BY A MOVING ATMOSPHERIC PRESSURE DISTURBANCE

2018 ◽  
pp. 34
Author(s):  
Xiaojing Niu ◽  
Yixiang Chen ◽  
Haojie Zhou
Keyword(s):  
Shallow Water ◽  
Atmospheric Pressure ◽  
Water Waves ◽  
Impact Factors ◽  
Pressure Disturbance ◽  
Proudman Resonance ◽  
Nonlinear Shallow Water Equations ◽  
Maximum Water ◽  
The Impact ◽  
The Waves

A moving atmospheric pressure disturbance can induce a system of forced water waves. As predicted by the linear theory, an infinite wave height will be induced when the Froude number Fr=1, which is known as the Proudman resonance. Fr is defined as the ratio between the moving speed of an atmospheric pressure disturbance and the phase velocity of shallow water wave. The Proudman resonance is thought to be one of main mechanisms for the destructive meteotsunami (Monserrat et al., 2006). In this study, the nonlinear shallow water equations are used to describe the waves induced by a moving pressure disturbance, and the impact factors to the maximum water elevation in the case of Fr=1 are discussed.

A High-Voltage Terminal for a Field-Emission Gun

1972 ◽  
Vol 30 ◽  
pp. 428-429
Author(s):  
N. F. Ziegler
Keyword(s):  
Field Emission ◽  
High Voltage ◽  
Atmospheric Pressure ◽  
Power Supplies ◽  
High Coherence

A high-voltage terminal has been constructed for housing the various power supplies and metering circuits required by the field-emission gun (described elsewhere in these Proceedings) for the high-coherence microscope. The terminal is cylindrical in shape having a diameter of 14 inches and a length of 24 inches. It is completely enclosed by an aluminum housing filled with Freon-12 gas at essentially atmospheric pressure. The potential of the terminal relative to ground is, of course, equal to the accelerating potential of the microscope, which in the present case, is 150 kilovolts maximum.

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