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AN EXTENDED modeling OF TIDE-WAVE MOTION

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Journal of Hydrodynamics 2001年第3期13卷 100-106页

作者： zhang qing hua, Xu Hao,{3.,{3., qingdao 2.6061, China key laboratory of marine science and numerical modeling,{3., qingdao 2.6061, China first Inst. of oceanography State Oceanic Administration Qingdao 266061 China

By vertical boundary conditions, a spectral expansion of horizontal tide wave velocity is done in vertical direction in terms of a complete basis functions selected properly, hence a relation between tide levels and spectral components is found theoretically under condition of ignoring the horizontal friction stress and nonlinear effect. And a relation between bottom friction of tide current, which satisfies the viscous condition on sea bottom, and tide levels is determined. The relation is different from the relation of the traditional parameterizing of bottom friction. Moreover integration of the continuity equation and momentum equations is carried out in the vertical direction using zero flux condition on solid boundaries and inputting condition on open boundaries, and then a boundary value problem of elliptic form on the tide levels is constructed.

关键词： tide waves basis function spectral expansion bottom friction

ANALYTIC METHOD FOR INVERSING THE OPEN BOUNDARY CONDITIONS IN A SEMI-CLOSED SEA AREA—CASE I FOR INVERSING THE TIDAL LEVELS AT OPEN BOUNDARY

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Journal of Hydrodynamics 2004年第5期16卷 590-595页

作者： zhangqing-hua YINXun-qiang MA{3. qu{3.-{3. keylaboratoryofmarine{3.and{3.modeling TheFirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China keylaboratoryofmarine{3.and{3.modeling TheFirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China

In this paper, a computational case was employed to describe thecomputational procedure for inversing the tidal level open boundary conditions using an analyticmethod. The area for finding the solution is a circular area with a circular arc with the openingangle 60°-being the open boundary and the other circular arc being the solid wall *** from the reestablished elliptic partial differential e{3.ation satisfied by the tidallevel function, the extended spectrum method was used to derive the general solution of the e{3.ationfor the sea of constant depth, and the impermeable solid wall condition (the second class boundarycondition) and the ade{3.ately specified open boundary conditions were then applied to determine theundetermined coefficients of the general solution, thus obtaining the tidal level distributionfunction. In this way, both the first and second class boundary values at the solid wall boundarywere obtained. With the above boundary values as the boundary conditions, the tidal level values atthe open boundary were then inversed by means of the general solution of tidal wave e{3.ation. Thevalidity of inversion method could be verified by comparing the inversed tidal level distributionswith the originally specified open boundary values.

关键词： semi-closed sea open boundary condition extended spectrum method generalsolution of equation in-version

KUROSHIO INTRUSION INTO THE SOUTH CHINA SEA

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Journal of Hydrodynamics 2006年第6期18卷 702-713页

作者： zhang qing-hua FAN Hai-mei qu yuan-yuan institute of Physical oceanography Ocean University of China Qingdao 266003 China key laboratory of marine {3. and {3. modeling State Oceanic Administration Qingdao 266061China

In this article, the circulation of the South China Sea （SCS）, which is idealized as the rectangular basin with constant depth, is studied under Kuroshio boundary forces. Starting from the linearly quasi-geostrophic vorticity equation, the solution of the SCS circulation is given in the form of corrected Fourier series under proper boundary conditions. The results show that the intruded current flows westward and separates into the northward branch and the southward branch before arriving at the western boundary. The southward branch flows out of the SCS through the southwestern passage, at the same time, the induced cyclonic （anti-clockwise） ring almost occupies the middle and southern parts, and concomitant anti-cyclonic （clockwise） vortex appears between the cyclone and the western boundary. While the northward branch outflows through the northeastern passage, the anti-cyclonic （clockwise） ring is triggered at the northern part of the SCS. The above two vortexes are both intensified if the south-entering and the north-leaving current loop intrusion are superposed. The outer flow of the northern vortex flows westward, then northward, and then eastward, and it is very similar to the configuration of the SCS Warm Current （SCSWC） at the northern part of the SCS, thus, a kind of generating mechanism of the SCSWC is presented.

关键词： Kuroshio boundary forces South China Sea (SCS) SCS Warm Current (SCSWC)

AN ACCURATE SOLUTION OF THE liNEAR THEORY OF THE WIND-DRIVEN OCEAN CIRCULATION-I. THE GENERAliZED SOLUTION

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Journal of Hydrodynamics 2003年第6期15卷 96-105页

作者： zhang qing-hua, qu yuan-yuan, Xia Chang-shuikey {3. of marine science and numerical modeling, state oceanic administration, first institute of {13., qingdao 2.6061, China, e-mail: qu-helen @ *** key laboratory of marine {3. and {3. modeling State Oceanic Administration First Institute of Oceanography Qingdao 266061 China

To model the wind-driven ocean circulation of the isobath rectangular basin,the linear vorticity equation with the meridional friction terra was used compared to the Munk'stheory on the ocean circulation. The generalized solution of the vorlicity equation was thus workedout in the sense of Fourier averaging by using the corrected Fourier expansion. The method to obtainthe undetermined coefficients was presented using the viscous boundary conditions.

关键词： wind-driven ocean circulation meridional friction corrected fourierexpansion