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Numerical investigation of the effects of aquatic plants on wind-induced currents in Taihu Lake in China

Journal of Hydrodynamics 2019年第4期31卷 778-787页

作者： Tian-ping Xu Ming-liang Zhang Hcng-zhi Jiang Jun Tang Hong-xing Zhang Hui-ting Qiao School of Ocean Science and Environment Dalian Ocean University Dalian 116023 China National Marine Environmental Monitoring Center Dalian 116023 China State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116023 China

Shallow lakes are an important part of the earth's water circulation system, and many factors may impact the evolution of the lake water circulation, including the wind, the topography, the human activities, and the aquatic plants. This paper proposes a depth-averaged 2-D hydrodynamic model to investigate the interaction of the wind-induced current and the aquatic plant in the lake. The model is based on the generalized shallow water equations solved by an explicit finite volume method with unstructured triangular grids. The drag force of the vegetation is considered into the momentum equations as the source term. Remote sensing techniques are applied to evaluate the aquatic vegetation in the Taihu Lake, China, based on Landsat TM satellite images. The study model is then used to simulate the characteristics of the wind-induced currents in the Taihu Lake, without and with the vegetation effects. The simulation results are in good agreement with the field measurements, demonstrating that the aquatic plants significantly affect the magnitude of the velocity and the flow circulation induced by the wind in the Taihu Lake. In addition, a sensitivity analysis reveals that the plant parameters (the density and the drag force coefficient) are significant factors influencing the velocity and the structure of the currents in the Taihu Lake.

关键词： Finite volume method Roe solver shallow lake wind-induced current aquatic plant

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wind-induced Response Characteristics of a Tall Building from GPS and Accelerometer Measurements

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Positioning 2011年第1期2卷 1-13页

作者： Cuilin Kuang Kenny Chung Sau Kwok Peter Andrew Hitchcock Xiaoli Ding 不详

The main objectives of the research are to characterize the wind-induced resonant and slowly-varying (quasi-static) responses of a tall building under ambient wind excitations based on GPS measurements. The equipment used includes two sets of orthogonally aligned accelerometers, two GPS receivers and an ultrasonic anemometer. The natural frequencies of the wind-induced vibration of the tall building are determined by carrying out spectral analysis of the measured time series of acceleration. The time series are also used to estimate the structural damping with the random decrement technique (RDT). The results show that GPS can be effectively used to measure the resonant and slowly-varying responses of tall buildings with 3D mode shapes under wind excitations. The results from the GPS and the accelerometers agree well with each other in both the time and frequency domains.

关键词： GPS Measurements Acceleration wind-induced Response Tall Building

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A Process Study of the wind-induced Circulation in the Persian Gulf

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Open Journal of Marine Science 2013年第1期3卷 1-11页

作者： Stéphane Pous Xavier Carton Pascal Lazure Ifremer Brest France Université de Bretagne Occidentale Brest France Université Pierre et Marie Curie Paris France

A shallow-water model, coupled with a three dimensional, hydrostatic ocean model, is used to study the wind induced circulation, and the Shatt-al-Arab river plume expansion, in the Persian Gulf. The models are used in an idealized configuration. The following results are obtained: 1) with northwesterly winds, a double gyre is formed: this gyre is cyclonic in the south and anticyclonic in the north. Southeastward currents flow along the Iranian and Arabian coast where the wind stress at the surface dominates the pressure gradient related to the free surface slope, and conversely in the deeper region of the Gulf;2) In the eastern part of the Gulf, the cyclonic gyre intensifies, as observed and reported in the literature;3) For northwesterly winds, the plume from Shatt-al-Arab first heads towards the Iranian coast and then spreads southeastward along the Arabian coast;for northerly and northeasterly winds, the plume directly follows the Kuwaiti coast and then the Arabian coast. This sensitivity of the orientation can be related to the double gyre flow structure;4) A southeasterly wind confines the plume in the northern end of the Gulf as does a pure tidal flow.

关键词： Persian Gulf wind-induced Circulation Hydrodynamical Modeling

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A More Precise Computation of Along wind Dynamic Response Analysis for Tall Buildings Built in Urban Areas

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Engineering（科研） 2010年第4期2卷 290-298页

作者： Shu-Xun Chen 不详

Modern tall buildings are generally built in urban areas, where value of the terrain roughness length is much greater than that of the general terrain areas, therefore wind-induced vibrations become more pronounced. The present formulas of numerical analysis of wind-induced response become less accurate. A more accurate expression of along-wind load spectrum matrix is proposed. On the basis of the expression, structural analysis formula of along-wind displacement and acceleration response are developed and programmed. The rationality of these formulas are illustrated in examples.

关键词： Tall Building wind Load Spectrum wind-induced Vibration Response Analysis Structural Analysis

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