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MODEL OF SEA ICE BREAKUP ON SHALLOW BEACH DUE TO tidal fluctuation

Journal of Hydrodynamics 2000年第4期12卷 41-45页

作者： Li Chun hua, Qiu Da hong, Wang Yong xue State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, P.R.China (Received Jan.18, 2000) Dalian Univ. of Technol. Dalian 116024 China

There are many factors that may lead to the breakup of shore fast ice, such as wind, wave, tide and so on. This paper mainly analyzed the ice breakup on the shallow beach due to tidal fluctuation. The theoretical model was set up and the fitting range was given. The calculated result shows that the slope angle α, the ice thickness h, and the ice length l are key factors in determining the ice breakup length l p.

关键词： model of sea ice breakup shallow beach tidal fluctuation

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Characteristics of Water and Sediment Exchange Between Yangtze Estuary and Hangzhou Bay

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China Ocean Engineering 2007年第2期21卷 255-266页

作者：孔俊宋志尧夏云峰章卫胜 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering College of OceanHohai University Nanjing Hydraulic Research Institute

Based on the 2-D flow and sediment numerical model of the Yangtze Estuary and the Hangzhou Bay, the characteristics of water and sediment exchange in their joint waters is studied through quantitative calculation and analysis of the characteristics of water flow and sediment transportation. The results show that there is periodical water and sediment exchange in this joint waters, that the net water exchange appears mainly between 0 - 6 m depth （theoretical datum plane, the same below） offshore and the maximum is near the depth of 2 m, and that the net sediment exchange mainly appears between 0 - 5 m depth and the maximum is near the depth of 3 m, indicating that the range of water flow passage is different from that of sediment transport from the Yangtze Estuary to the Hangzhou Bay. Combined with the results of numerical simulation, this paper also analyzes the hydrodynamical mechanism influencing water and sediment exchange between the Yangtze Estuary and the Hangzhou Bay, including tidal fluctuation, tidal current kinetic energy, tide-induced residual current and the trace of water particles. Finally, the sediment transportation passage on the Nanhui tidal fiat is discussed, and the results show that sediment is transported into the Hangzhou Bay from the south side of Shipilei, while sediment is brought back to the South Channel of the Yangtze Estuary from the north side.

关键词： tidal fluctuation residual current tidal flow kinetic energy tidal ctu'rent flux sediment transport flux

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Groundwater Waves in a Coastal Fractured Aquifer of the Third Phase Qinshan Nuclear Power Engineering Field

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Journal of Shanghai Jiaotong university(Science) 2005年第4期10卷 441-445页

作者：周念清唐益群唐和平 Dept. of Geotechnical Eng. Tongji Univ. Shanghai 200092 China No.4 Research and Design Inst. of Nuclear Industry Shijiazhuang 050021

tidal fluctuations of Hangzhou Bay produce progressive pressure waves in adjacent field fractured aquifers, as the pressure waves propagate, groundwater levels and hydraulic gradients continuously fluctuate. The effect of tidal fluctuations on groundwater flow can be determined using the mean hydraulic gradient that can be calculated by comparing mean ground and surface water *** fluctuation is shown to affect the piezometer readings taken in a nearshore fractured aquifer around the nuclear power engineering field. Continuous monitoring of a network of seven piezometers provided relations between the tidal cycle and the piezometer readings. The relations can be expressed in times of a time and amplitude scaling factor. The time lag and the tidal efficiency factor and wavelength are calculated using these parameters. It provides significant scientific basis to prevent tide and groundwater for the nuclear power engineering construction and safety run of nuclear power station in the future.

关键词： tidal fluctuation fractured aquifer hydraulic gradient time lag tidal efficiency factor nuclear power engineering

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