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A flume test on erosion mechanism for an abandoned section of the Huanghe (Yellow) River Delta |
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| Authors: | Tao Gao Guangxue Li Jinghao Shi Ping Dong Jie Liu |
| Institution: | 1. College of Marine Geosciences, Ocean University of China, Qingdao, 266100, China 2. The Department of Resources and Environment Science of Heze University, Heze, 274000, China 3. Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao, 266100, China 4. Division of Civil Engineering, School of Engineering, Physics and Mathematics, University of Dundee, Dundee, DD14HN, UK |
| Abstract: | The erosion mechanisms of abandoned coastal section are understood detailedly by flume experiment, which play an important role to the offshore engineering facilities. A movable-bed physical model has been used to investigate the coastal erosion of an abandoned section of the Huanghe (Yellow) River Delta. The theory of physical scale models is discussed and a method for constructing the representative seabed section is developed. The results indicate that during the period initially after the abandonment of the delta the entire bed experienced rapid erosion because the seabed was steep and prone to liquefaction that resulted from storm wave action. After this initial period, a balance of erosion and accretion was established, and the beach profile equilibrated with a point of balance present on the profile. The experimental results indicate that the volume of deposition was about half that of the erosion. Wave action may also induce significant stratal changes through its interaction with the soft seabed. The major morphological features developed in the model delta section were found to be qualitatively comparable with those observed in the prototype. A distorted modeling law that maintains the similarity of the modeled and prototype equilibrium beach profiles is proposed. Experimental results show that the distorted modeling is able to reproduce the beach-face slope in nature, and the model also successfully reproduced three historical evolutionary stages of erosion. |
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