According to exploration seismic sounding data,density stratification wag fixed forgravity anomalies along the Fenghuang-Chaling geoscieroe section. The section density model wasessablished with the help of variable density horizontal trapezoid body,ac th6 calculated theoretical anomalies are coincideal with the measured Bouguer gravity anomalies.

A sound analysis of velocity distributions of steady,uniform water sediment mixture flows in open channels is presented based on mass and momentum conservation laws. The shear stress due to sediment particle particle interactions and the buoyancy effects due to density stratification are considered respectively through the mixture′s constitutive relationship and an adapted Monin Obukhov length scale. Excellent performance of the developed model is demonstrated through comparison with measured data.

In the two-dimensional wind tunnel, systematic experimental researches were carried out on the phenomenon of reverse transition on a heated plane with stable density stratification.

In the two-dimensional wind tunnel, systematic experimental researches were carried out on the phenomenon of reverse transition on a heated plane with stable density stratification.

Firstly, the concept of local area is brought forward, and the method of subtracting local averaged density stratification is used in the numerical schemes of baroclinic pressure gradient terms in σ coordinate, which can improve the calculation precision of baroclinic pressure gradient.

The application of the spin separating technology has two necessaryconditions: one is that the mixture flow must has pressure energy, the other is that between thetwo-phase mediums must has density stratification;

In this thesis we consider a viscous instability that is a modified form of the familiar Tollmien-Schlichting (T-S) waves by stable density stratification.

However,the horizontal pressure gradient force estimation is problematic over steep topography and density stratification areas in sigma coordinate model. The artificial pressure gradient error may create artificial flow.

Some examples are given,showing that density stratification can have a large effect on the added mass and damping of the floating rectangular box in a two-layer fluid over a range of frequencies.

The effect of thermal boundary conditions and density stratification on the appearance of convection in the atmospheres of plane

The effect of the density stratification of the atmosphere on the structure of the thermal during its motion is analyzed, and relations describing the characteristic points of the thermal and the smearing of its leading edge are obtained.

The vertical displacement of the water particles relative to the equilibrium position is obtained in the form of a series in terms of waves modes for a given density stratification.

The fine structure of thermoconvective flow near an inclined- plane heat source within a fluid with a stable density stratification due to salinity gradient is investigated using optical and probe techniques.

In the axisymmetric case the geostrophic vortex is qualitatively analyzed on the basis of a numerical calculation of integral representations of the hydrodynamic fields for a fluid with an exponential density stratification.

A theoretical formula of amplitudes of internal waves generated by even-paddle wave-makers, , is derived under the condition of linear'density stratification, where m is an odd number and 2m is the mode number. When A, N and ω are constants, the amplitude ratio of mode 2m to mode 2(m+2) is a2m/a2(m+2)=(m+2)2/m2. The theoretical results are examined by laboratory experiments performed in a small long tank using a mode 1-and-mode 2 paddle wave-maker designed by authors. The agreement is reasonable. The weakness...

A theoretical formula of amplitudes of internal waves generated by even-paddle wave-makers, , is derived under the condition of linear'density stratification, where m is an odd number and 2m is the mode number. When A, N and ω are constants, the amplitude ratio of mode 2m to mode 2(m+2) is a2m/a2(m+2)=(m+2)2/m2. The theoretical results are examined by laboratory experiments performed in a small long tank using a mode 1-and-mode 2 paddle wave-maker designed by authors. The agreement is reasonable. The weakness of the theory is that it can hot predict the amplitudes with even number m.

An experimental investigation on turbulent mixing and density stratification of flows which result from the merging of two layers of flow with temperature difference(or with salinity difference, or with both temperature difference and salinity difference) was conducted in detail, and a mathematical model for density stratified flow is suggested. In the paper, some experimental results and computational results are reported. The experimental results show that within the scope of flow investigated,...

An experimental investigation on turbulent mixing and density stratification of flows which result from the merging of two layers of flow with temperature difference(or with salinity difference, or with both temperature difference and salinity difference) was conducted in detail, and a mathematical model for density stratified flow is suggested. In the paper, some experimental results and computational results are reported. The experimental results show that within the scope of flow investigated, major factors which influence the mixing are the velocity ratio (V_2/V_1) and density Froude number(F_0), critical condition of stratification stability can be dcscribed by a simple formula about V_2/V_2 and F_0, and it is not related to the Reynolds number(Re). The comparison between computation results and experimental results shows that the present model can be used to simulate temperature stratified flow and salinity stratified flow correctly. According to the structure of model, it can be believed that the present model reflects the feature of anisotropic turbulence and the interaction between stratification and turbulence reasonably.

Based on the fundamental equations of geophysical fluid dynamics and the consequence of vertical density stratification, this research applies travelling wave coordinate to the 3-D Boussinesq fluid to study the nonlinear permanent wave. An autonomous system of ordinary differcntial equations in two variables is obtained as follows:Rigorous study of the mathematical mechanics of the geometric topological structures in phase plane led to the conclusion that nonlinear wave is periodic in propagation direction...

Based on the fundamental equations of geophysical fluid dynamics and the consequence of vertical density stratification, this research applies travelling wave coordinate to the 3-D Boussinesq fluid to study the nonlinear permanent wave. An autonomous system of ordinary differcntial equations in two variables is obtained as follows:Rigorous study of the mathematical mechanics of the geometric topological structures in phase plane led to the conclusion that nonlinear wave is periodic in propagation direction and that solitary waves do not exist.Further researches showed the travelling wave system can be transformed into a simpler form by using the Hamilton function and "action-angle" variables so that the complex nonlinear wave was simp1ified into a system like simple harmonic vibration.Using the transformed form of nonlinear wave and the directional angle of travelling wave, the analytic solution of nonlinear inertia-gravity internal wave can be written in the form