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Darwin’s Theory About “Impassable”Marine Barrier Holds True for Coral Larvae
Darwin’s Theory Impassable Marine Barrier Coral Larvae
2016/9/12
An international team of scientists used a state-of-the-art computer model, a high-powered supercomputer, and five billion ‘virtual’ coral larvae to test Charles Darwin’s 1880 hypothesis that marine s...
Threshold-driven shifts in two copepod species: Testing ecological theory with observational data
Threshold-driven shifts two copepod species Testing ecological theory observational data
2014/4/2
We used an observed abrupt shift in the dominance pattern of two coexisting copepod species in Müggelsee, a shallow eutrophic lake in Germany, to investigate mechanisms leading to this shift, by embed...
Toward a more comprehensive theory of zooplankton diel vertical migration: Integrating ultraviolet radiation and water transparency into the biotic paradigm
comprehensive theory zooplankton diel vertical migration Integrating ultraviolet radiation water transparency biotic paradigm
2014/4/4
The current prevailing theory of diel vertical migration (DVM) of zooplankton is focused largely on two biotic drivers: food and predation. Yet recent evidence suggests that abiotic drivers such as da...
Fully Nonlinear Shallow Water Waves Simulation Using Green-Naghdi Theory
Green-Naghdi theory model fully nonlinear water waves shoaling waves
2011/9/8
Green-Naghdi (G-N) theory is a fully nonlinear theory for water waves. Some researchers call it a fully nonlinear Boussinesq model. Different degrees of complexity of G-N theory are distinguished by “...
Application of Optimal Control Theory to Course Keeping Problem in Following Seas
Optimal Control Theory Following Seas Application
2009/4/28
When a ship runs in following and quartering seas, she could occasionally face broaching-to, which is a major threat of ship capsizing, or difficulty to keep her desired course due to wave-induce forc...
A simple nonlinear model of the generation of Kelvin waves is presented and applied to internal Kelvin waves in Lake Michigan. It is shown that a Kelvin wave which has a wavelength longer than the Ros...
The three-dimensional circulation produced in a homogeneous ocean by a steady wind stress is investigated when the bottom topography contains a discontinuity in gradient, such as occurs at the edge ...
Baroclinic Instability over a Slope. Part II：Finite-Amplitude Theory
Baroclinic Instability Finite-Amplitude Theory
2009/3/24
Baroclinic instability of a circular current is modified by the presence of a unidirectional bottom slope. An analytical theory is developed for the slightly unstable flow regime over a weak slope. Th...
Baroclinic Instability over a Slope. Part I：Linear Theory
Baroclinic Instability Slope Linear Theory
2009/3/24
We consider the instability properties of a circular current in the upper layer of a two-layer quasi-geostrophic ocean over a unidirectional slope. This particular flow-topography geometry is intended...
On Phillips’Theory of Equilibrium Range in the Spectra of Wind-Generated Gravity Waves
Equilibrium Range Wind-Generated Gravity Waves
2009/3/24
Phillips' hypothesis concerning the equilibrium range in the spectrum of wind-generated surface waves in deep water can be expressed either in the frequency form S(ω)ω−5 or the wavenumber form (...
Theory of Steady Wind-Driven Currents in Shallow Water with Variable Eddy Viscosity
Steady Wind-Driven Currents Shallow Water Variable Eddy Viscosity
2009/3/24
A theory is given for steady wind-driven currents in shallow water (friction depth comparable to total depth) in which the vertical eddy viscosity varies linearly with depth, from zero at the bottom t...
Continental Shelf Currents in Tropical Storm Delia：Observations and Theory
Continental Shelf Currents Tropical Storm Delia
2009/3/7
Storm currents are a significant part of the design hydrodynamic flow field in areas subject to tropical storms. In September 1973, Tropical Storm Delia passed over the instrumented Buccaneer platform...
On the Nonlinear Theory for Gravity Waves on the Ocean's Surface. Part II：Interpretation and Applications
Nonlinear Theory Gravity Waves Ocean's Surface Interpretation
2009/3/7
In a previous paper (Weber and Barrick, 1977), a generalization of Stokes’ perturbational technique permitted us to obtain solutions to higher orders for gravity-wave parameters for an arbitrary, two-...
On the Nonlinear Theory for Gravity Waves on the Ocean's Surface. Part I：Derivations
Nonlinear Theory Ocean's Surface Gravity Waves
2009/3/7
A general hydrodynamic solution is derived for arbitrary gravity-wave fields on the ocean surface by extending Stokes' (1847) original perturbational analysis. The solution to the nonlinear equations ...
On Geostrophic Adjustment in Sea Straits and Wide Estuaries：Theory and Laboratory Experiments. Part II—Two-Layer System
Sea Straits II—Two-Layer System Wide Estuaries
2009/2/23
A frictionless nonlinear model with allowance for motions which are far from a state of geostrophic balance is considered in order to describe the dynamics of outflows consisting of two layers of flui...