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A novel high resolution model without open boundary conditions applied to the China Seas: first investigation on tides

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Acta Oceanologica Sinica 2010年第6期29卷 12-25页

作者： YU Huaming CHEN Xueen BAO Xianwen Thomas Pohlmann WU Dexing Institute of Physical Oceanography Ocean University of China Qingdao 266100 China Institute of Oceanography Centre for Marine and Climate Research University of Hamburg Hamburg 20146 Germany

We developed a Global Ocean Circulation and Tide model （GOCTM） with coarse grids in the open deep ocean degrading ‘smoothly’ into the highly resolved China Seas （CS） of refined grids to study the tides and circulation *** is based on the framework of the finite volume approach for better mass conservation through improved transports across the discrete individual control *** also takes a full advantage of the geometric flexibility of unstructured mesh using a realistic global topography including the Arctic *** CS are given a special focus by refining the unstructured grids,but they are embedded into global domain ***,GOCTM not only successfully avoids the treatment of the open boundaries,but also optimizes the trade-off between computational cost and model ***,GOCTM is driven by the astronomical tide-generating potential and the secondary tide-generating potential directly,together with the wind stress and heat *** succeeds in reproducing the global eight principal tidal harmonic ***,the simulated tidal results in the CS are improved compared to some other regional models with the discrepancy of 3.9 cm for M 2 *** idea of GOCTM can also be referred for other regional ocean study.

关键词： finite volume model GOCTM open boundary conditions the China Seas

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Shallow sediment transport flow computation using time-varying sediment adaptation length

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International Journal of Sediment Research 2014年第2期29卷 171-183页

作者： Jaan Hui PU Khalid HUSSAIN Song-dong SHAO Yue-fei HUANG School of Engineering and Informatics University of Bradford West Yorkshire BD7 1DPUK.Lecturer School of Engineering University of Bradford West Yorkshire BD7 1 DPUK.Head Department of Civil and Structure Engineering University of Sheffield Sheffield S1 3JDUK Senior Lecturer State Key Laboratory of Hydro-Science and Engineering Tsinghua University

Based on the common approach,the adaptation length in sediment transport is normally estimated astemporally ***,this approach might not be theoretically justified as the process of reaching the sediment transport equilibrium stage is affected by the flow conditions in time,especially for fast moving flows,such as scour-hole developing *** this study,the two-dimensional(2D) shallow water formulation together with a sediment continuity-concentration(SCC) model were applied to flow with mobile sediment boundary.A timevarying approach was proposed to determine the sediment transport adaptation length to simulate the sediment erosion-deposition *** proposed computational model was based on the finite volume(FV) *** Monotone Upwind Scheme of Conservative Laws(MUSCL)-Hancock scheme was used with the Harten Lax van Leer-contact(HLLC) approximate Riemann solver to discretize the FV *** the flow applications of this paper,a highly discontinuous dam-break,fast sediment transport flow was used to calibrate the proposed timevarying sediment adaptation length *** the calibrated model was further applied to two separate experimental sediment transport flow applications documented in the literature,i.e.a highly concentrated sediment transport flow in a wide alluvial channel and a sediment aggradation *** agreement with the experimental data were obtained with the proposed model *** tests prove that the proposed model,which was calibrated by the discontinuous dam-break bed scouring flow,also performed well to represent rapid bed change and steady sediment mobility conditions.

关键词： finite volume model Harten Lax van Leer-contact solver Monotonic upwind scheme Sediment transport Shallow water model Time-varying sediment adaptation length

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