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Feedback between tidal hydrodynamics and morphological changes induced by natural process and human interventions in a wave-dominated tidal inlet: Xiaohai, Hainan, China

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Acta Oceanologica Sinica 2009年第3期28卷 93-113页

作者： GONG Wenping SHEN Jian JIA Jianjun School of Marine Science Sun Yat-Sen University Guangzhou 510275 China Virginia Institute of Marine Science College of William and Mary Gloucester Point VA23062 USA Key Laboratory of Submarine Geosciences Second Institute of Oceanography State OceanicAdministration Hangzhou 310012 China

The feedback between morphological evolution and tidal hydrodynamics in a wave-dominated tidal inlet, Xiaohai, China is investigated through data analysis and numerical model experiments. Historically, Xiaohai Inlet had two openings, located at the north and south of Neizhi Island （a rocky outcrop）, respectively. The evolution of Xiaohai Inlet was dominated by the natural process before 1972. In addition to the natural process, human interventions, including the closure of the north opening, 50% of freshwater reduction, and increase of land reclamation, have altered tidal hydrodynamics and morphological evolution since 1972. A series of numerical model simulations were conducted to investigate the influence of morphological changes on the hydrodynamics and the influence of human activities on the inlet evolution. The natural process has caused narrowing and shoaling of the inlet throat, development of the flood-tidal delta, and shoaling of the tidal channel inside the lagoon. Human interventions have accelerated these changes. Consequently, the tidal propagation from the offshore into the lagoon has been impeded and the tidal energy has been dissipated substantially. tidal current has changed from ebb-dominant to flood-dominant in most parts of the inlet system whereas the inlet throat has remained as ebb-dominant, the tidal prism has decreased consistently, and sediment has continued to deposit inside the inlet. As a result, the changes of morphology, hydrodynamics, and sediment transport show a positive feedback. The human interventions have had both advantageous and adverse influences on the stability of the inlet. The closure of the North Opening has decreased the longshore sediment input to the inlet, and increased the tidal prism, ebb velocity, and sediment transport in the south opening, thus enhancing the inlet＇s stability. However, reducing the river discharge and landfill of the tidal flats has resulted in a decrease of the tidal prism, the ebb velocity, a

关键词： morphological evolution tidal hydrodynamics ELCIRC Hainan China

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Numerical hydrodynamics Study Around Turbine Array of tidal Stream Farm in Zhoushan, China

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Journal of Ocean University of China 2017年第4期16卷 703-708页

作者： YU Zhiwen ZHANG Jisheng ZHAI Yanyan ZHANG Tiantian ZHENG Jinhai State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 P. R. China College of Harbor Coastal and Offshore Engineering Hohai University Nanjing 210098 P. R. China Powerchina Water Environment Governance Shenzhen 518100 P. R. China China Three Gorges Corporation Beijing 100038 P. R. China

In recent decades,great efforts have been made to efficiently explore tidal stream energy due to its unique advantages of easy prediction and great *** recently launched a national tidal stream farm demonstration project in the waterway between Putuoshan and Hulu Islands in the Zhoushan *** deployment of the turbine array,it is necessary to understand the hydrodynamic changes associated with the construction of a turbine *** this study,we developed a depth-averaged hydrodynamics model that solves the shallow water governing equations to simulate the tidal hydrodynamics around the Zhoushan *** simulation results agree with field data in terms of the water elevation and stream *** considered two types of turbine arrays in this study and investigated their impacts on the local *** general,the stream velocity in the northern and southern areas is reduced due to the power take-off of the turbine array,whereas stream velocity in the western and eastern areas is slightly increased due to the blockage impact of the turbine array.

关键词： tidal stream farm turbine array tidal hydrodynamics numerical simulation demonstration project

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Sand Waves Generation: A Numerical Investigation of the Infiernillo Channel in the Gulf of California

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Open Journal of Marine Science 2016年第3期6卷 412-422页

作者： Yovani Montaño Ley Noel Carbajal Instituto de Ciencias del Mar y Limnología Universidad Nacional Autónoma de México Unidad Académica Mazatlán Mazatlán México Instituto Potosino de Investigación Científica y Tecnológica San Luis Potosí México

The effect of the coastal geometry on sand bed forms generation has been investigated for a tidal dominated area. Different hypothetical geometries of coastal channels with flat bottoms and unlimited sediment availability were exposed to strong oscillatory tidal currents to simulate the interaction of hydrodynamics and the bedload sediment transport. The hypothetical geometries stand for the idealization of the principal geographic features of the Infiernillo Channel, a coastal area of the Gulf of California where sandbanks and sand waves have been observed. A depth integrated hydrodynamic-numerical model and a parameterized formula to estimate the bedload sediment transport were applied coupled with a sediment conservation equation to determine the sea bottom morphodynamics. Model predictions in the Infiernillo Channel were compared to available satellite imagery. This investigation demonstrates that a vertical integrated numerical model is able to reproduce the development of incipient sand waves that exist in the Infiernillo Channel. Incipient sandbanks and shoals were also simulated. Sand waves with wavelengths of about 200 m were calculated on the same locations where sand waves actually exist. A crucial finding of this research was to show that the geometry of a shallow water basin and the presence of tidal velocity gradients associated with abrupt changes in the coastline alignment were critical in determining the sand-bed pattern generation. We demonstrate that a vertical variation of tidal currents is not necessary to generate sand waves.

关键词： Sand Waves tidal hydrodynamics Bed Load Sediment Transport

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