PROGRESS IN SEDIMENT DYNAMIC GEOMORPHOLOGICAL STUDY OF HEADLAND-BAY BEACHES
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摘要: 岬湾海滩是砂质海岸稳定性及其演变的重要内容。介绍了岬间海湾平面形态平衡模型、海滩平衡剖面模式、海滩剖面主要类型的判别以及海岸泥沙运动,其中着重评述了现今岬间海湾平面形态平衡模型和海滩平衡剖面模式。通过它们的优缺点分析,认为人工神经网络模型是未来新型平面形态模型改进的方向;海滩平衡剖面模式分段使用,亦或2种或多种模式配合使用,更加符合实际情况。在以往研究中潮汐对海滩的影响往往被忽略,所以应加强对潮控海滩的研究;在泥沙输移方面至今还未有成熟系统的公式,现有的公式假定成分多,还有待进一步研究。提出了多学科综合集成是今后岬湾海滩研究的关键的思路。Abstract: The study of headland-bay beaches is significant to the stability of sandy coasts. After a review of some models concerning beach equilibrium, types of beach profile and coastal sediment movement, the authors realized that the artificial neural network model represents the new direction for improvement of existing models. Our experience demonstrates that it is more efficient if we divide the beach into sections and use beach equilibrium profile model for each sections or use two or more models for one beach profile. In former researches, the influence of tide on beach is always ignored. So it is required to enhance the study of tide-dominated beaches. In addition, there is lack of formulas for the sediment transportation, and the formulas now in use have too many assumptions. Therefore, it requires further research in this subject. In conclusion, the multi-disciplinary integration is the key to the headland-bay beaches research.
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Key words:
- headland-bay beaches /
- planform shape /
- equilibrium profile /
- coastal sediment movement
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