scholarly journals LONG PERIOD OSCILLATION OF FLUID VELOCITY BEHIND SUBMERGED BREAKWATER CAUSED BY ABSORBING WAVE GENERATOR

1999 ◽  
Vol 15 ◽  
pp. 83-88
Author(s):  
Masaru YAMASHIRO ◽  
Akinori YOSHIDA ◽  
Isao IRIE ◽  
Hiromitu OTI
Keyword(s):  
Fluid Velocity ◽  
Submerged Breakwater ◽  
Long Period ◽  
Wave Generator ◽  
Period Oscillation

scholarly journals Changes in the strength and width of the Hadley Circulation since 1871

2012 ◽  
Vol 8 (4) ◽  
pp. 1169-1175 ◽  
Author(s):  
J. Liu ◽  
M. Song ◽  
Y. Hu ◽  
X. Ren
Keyword(s):  
20Th Century ◽  
Global Climate ◽  
Hadley Circulation ◽  
Recent Change ◽  
Early 20Th Century ◽  
Greenhouse Warming ◽  
Long Period ◽  
The Past ◽  
Period Oscillation

Abstract. Recent studies demonstrate that the Hadley Circulation has intensified and expanded for the past three decades, which has important implications for subtropical societies and may lead to profound changes in global climate. However, the robustness of this intensification and expansion that should be considered when interpreting long-term changes of the Hadley Circulation is still a matter of debate. It also remains largely unknown how the Hadley Circulation has evolved over longer periods. Here, we present long-term variability of the Hadley Circulation using the 20th Century Reanalysis. It shows a slight strengthening and widening of the Hadley Circulation since the late 1970s, which is not inconsistent with recent assessments. However, over centennial timescales (1871–2008), the Hadley Circulation shows a tendency towards a more intense and narrower state. More importantly, the width of the Hadley Circulation might have not yet completed a life-cycle since 1871. The strength and width of the Hadley Circulation during the late 19th to early 20th century show strong natural variability, exceeding variability that coincides with global warming in recent decades. These findings raise the question of whether the recent change in the Hadley Circulation is primarily attributed to greenhouse warming or to a long-period oscillation of the Hadley Circulation – substantially longer than that observed in previous studies.

scholarly journals THE EFFECT OF LONG PERIOD OSCILLATION IN THE STORM SURGE

2002 ◽  
Vol 18 ◽  
pp. 125-130
Author(s):  
Hiroshi YOSHIOKA ◽  
Shigeatsu SERIZAWA ◽  
Tomotsuka TAKAYAMA
Keyword(s):  
Storm Surge ◽  
Long Period ◽  
Period Oscillation

Field Observations and Analyses of Long-Period Oscillation in Harbours and Bays

1983 ◽  
Vol 26 (1) ◽  
pp. 39-50 ◽  
Author(s):  
Naoto Yamada ◽  
Shuji Yamamoto ◽  
Yasuhiro Hosokawa
Keyword(s):  
Field Observations ◽  
Long Period ◽  
Period Oscillation

A study of magnetothermal and Shubnikov – de Haas oscillations in arsenic

1968 ◽  
Vol 46 (17) ◽  
pp. 1935-1943 ◽  
Author(s):  
J. Vanderkooy ◽  
W. R. Datars
Keyword(s):  
Fermi Surface ◽  
Sample Material ◽  
Effect Factors ◽  
Long Period ◽  
Period Oscillation ◽  
Shubnikov De Haas Oscillations ◽  
Haas Effect

Magnetothermal and Shubnikov – de Haas oscillations were observed in arsenic. The periods of the oscillations are in agreement with those from recent de Haas – van Alphen experiments that support the Lin–Falicov model of the arsenic Fermi surface. The ratio of oscillatory and non-oscillatory resistivities is of the magnitude predicted by Adams–Holstein theory. It is shown that, for the same sample material, the Dingle temperature of the Shubnikov – de Haas effect is larger than the corresponding temperature of the de Haas – van Alphen effect. The long-period oscillation is not observed in the Shubnikov – de Haas effect. Factors that could attenuate the long-period oscillation are considered. Variations in temperature in the magnetothermal effect are compared to calculated values determined from the amplitude of the de Haas – van Alphen torque oscillations.

scholarly journals Changes in the strength and width of the Hadley circulation since 1871

2012 ◽  
Vol 8 (2) ◽  
pp. 695-713 ◽  
Author(s):  
J. Liu ◽  
M. Song ◽  
Y. Hu ◽  
X. Ren
Keyword(s):  
20Th Century ◽  
Global Climate ◽  
Hadley Circulation ◽  
Recent Change ◽  
Early 20Th Century ◽  
Greenhouse Warming ◽  
Long Period ◽  
The Past ◽  
Period Oscillation

Abstract. Recent studies demonstrate that the Hadley Circulation has intensified and expanded for the past three decades, which has important implications for subtropical societies and may lead to profound changes in global climate. However, the robustness of this intensification and expansion that should be considered when interpreting long-term changes of the Hadley Circulation is still matters of debate. It also remains largely unknown how the Hadley Circulation has evolved over longer periods. Here we present long-term variability of the Hadley Circulation using the 20th Century Reanalysis. It shows a slight strengthening and widening of the Hadley Circulation since the late 1970s, which is not inconsistent with recent assessments. However, over centennial timescales (1871–2008), the Hadley Circulation shows a tendency towards more intense and narrower state. More importantly, the width of the Hadley Circulation has not yet completed a life-cycle since 1871. The strength and width of the Hadley Circulation during the late 19th and early 20th century show strong natural variability, exceeding variability that coincides with global warming in recent decades. These findings raise the question that the recent change of the Hadley Circulation is primarily attributed to greenhouse warming or a long-period oscillation of the Hadley Circulation substantially longer than that observed in previous studies.

scholarly journals REFLEKSI GELOMBANG PADA PEMECAH GELOMBANG TENGGELAM BLOK BETON BERKAIT

2018 ◽  
Vol 9 (1) ◽  
pp. 33-42 ◽  
Author(s):  
I Ketut Dharma Setiawan ◽  
Juventus Welly Radianta Ginting
Keyword(s):  
Concrete Block ◽  
Coastal Protection ◽  
Block Type ◽  
Wave Forces ◽  
Research Subject ◽  
Submerged Breakwater ◽  
Experimental Station ◽  
Processing Data ◽  
Wave Generator ◽  
Resource Research

When a large dimension of rock needed for an armored layer of breakwater, the scarcity of it became a major adversity, because of that many research subject of using concrete as a substitute for rock performed. One of the research are the usage of concrete block for submerged breakwater as a method for avoiding a very large concrete block, but still able to withstood wave forces. The key is in the interlocking of each concrete block so it could achieve the desired result with a lesser dimension concrete block. The research was performed in Laboratory of Coastal Experimental Station, Water Resource Research Center, using a 2D channel. The facility used were flume channel, regular wave generator machine, wave dumper, wave probe, and computer for processing data. The experiment indicate that the wave energy attenuation depends on the dimension of interlocking concrete block type submerged breakwater. The dimension represented in the form of relation of the distance of water level to structures crest and the crests width. The breakwater performance of the concrete block is quite useful as an underwater coastal protection building viewed from reflection with a reflection coefficient of 34.7% at (h?d) / h = 0 and the peak width of B = 2.0

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