Physical impact on the reclamation area resulting from offshore dredging at the Changhwa coast, Taiwan |
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Authors: | Tai-Wen Hsu Hsien-Kuo Chang |
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Institution: | a Department of Hydraulics and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan;b Department of Civil Engineering, National Chiao Tung University, Hsinchu 300, Taiwan |
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Abstract: | The physical impact of offshore dredging on the reclamation area at the Changhwa coast, Taiwan, is investigated using a three-dimensional movable-bed model test. A distorted modeling law consisting of maintaining similarity of the equilibrium beach profile between the model and prototype is proposed. The geometric distortion was verified through a series of preliminary experiments conducted in a wave flume. Experimental results show that the distorted modeling is able to reproduce the beach-face slope in nature. An appropriate long-term morphological time-scale was determined based on a comparison of model longshore littoral transport rates and equivalent prototype values. Seabed topographical changes before and after offshore dredging are evaluated in model tests. A suitable countermeasure to prevent beach erosion from wave attack along the reclamation area is suggested from the experimental results. |
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Keywords: | Offshore dredging Moveable-bed test Distorted modeling law |
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