Role of Benthic Protozoa and Microinvertebrates of the Shallow-Water Zone of the Kremenchug Reservoir in the Processes of Production and Decomposition

2003 ◽  
Vol 39 (4) ◽  
pp. 26-44
Author(s):  
A. A. Kovalchuk
Keyword(s):  
Shallow Water ◽  
Water Zone ◽  
Kremenchug Reservoir

scholarly journals A shallow water analogue of asymmetric core-collapse, and neutron star kick/spin

2011 ◽  
Vol 7 (S279) ◽  
pp. 134-137
Author(s):  
Thierry Foglizzo ◽  
Frédéric Masset ◽  
Jérôme Guilet ◽  
Gilles Durand
Keyword(s):  
Neutron Star ◽  
Shallow Water ◽  
Acoustic Waves ◽  
Large Scale ◽  
Massive Stars ◽  
Core Collapse ◽  
Hydraulic Jumps ◽  
Core Collapse Supernova ◽  
Accretion Shock

AbstractMassive stars end their life with the gravitational collapse of their core and the formation of a neutron star. Their explosion as a supernova depends on the revival of a spherical accretion shock, located in the inner 200km and stalled during a few hundred milliseconds. Numerical simulations suggest that the large scale asymmetry of the neutrino-driven explosion is induced by a hydrodynamical instability named SASI. Its non radial character is able to influence the kick and the spin of the resulting neutron star. The SWASI experiment is a simple shallow water analog of SASI, where the role of acoustic waves and shocks is played by surface waves and hydraulic jumps. Distances in the experiment are scaled down by a factor one million, and time is slower by a factor one hundred. This experiment is designed to illustrate the asymmetric nature of core-collapse supernova.

Experimental study on resonantly forced interfacial waves in a stratified circular cylindrical basin

2007 ◽  
Vol 582 ◽  
pp. 203-222 ◽  
Author(s):  
GEOFFREY W. WAKE ◽  
EMIL J. HOPFINGER ◽  
GREGORY N. IVEY
Keyword(s):  
Shallow Water ◽  
Alternative Pathway ◽  
Primary Resonance ◽  
Single Layer ◽  
Forced Response ◽  
Interfacial Waves ◽  
Resonant Condition ◽  
Resonant Forcing ◽  
Shallow Water Depth

Laboratory experiments have been performed on resonantly forced interfacial waves in a circular cylindrical basin containing a two-layer stratified fluid. The results of this shallow-water study exhibit a number of similarities to previous shallow-water studies performed in single-layer fluids, such as the generation of a large-amplitude response over a frequency bandwidth offset from the primary resonance, generation of a swirling mode at the observed resonant condition, and the significant contribution of higher harmonics. The two-layer experiments also produce results that are unique to stratified domains. In particular, the observed negative nonlinearity of the resonant condition at shallow water depth, mixing of the density interface resulting in detuning the forced response from the resonant condition, the enhanced role of viscous dissipation, and an alternative pathway for the nonlinear generation of higher-frequency waves when the layer depths are disparate. The results of this study are considered with regard to their implications for enclosed basins at the geophysical scale that are subject to near resonant forcing.

scholarly journals The role of experiments understanding shallow water coherence and predictability

1991 ◽  
Vol 89 (4B) ◽  
pp. 1961-1962
Author(s):  
Harry A. De Ferrari ◽  
Daniel Wormser
Keyword(s):  
Shallow Water
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