Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan
Sandbar Migration and Shoreline Change on the Chirihama Coast, Japan
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DOI：
10.3390/jmse4020040
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发表时间：
2016-06
影响因子：
2.9
通讯作者：
M. Yuhi;Masayuki Matsuyama;K. Hayakawa
中科院分区：
文献类型：
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作者：
M. Yuhi;Masayuki Matsuyama;K. Hayakawa
桑迪在区域旅游业中起着关键作用。重要的是要了解保护有吸引力的海滩背后的主要形态过程。在这项研究中，形态变化的千里滨海岸，日本，一个重要的地方旅游资源，进行了调查，使用两套实地调查。目的是分析和记录的多尺度行为的海滩。首先，根据过去二十年的海岸线调查，对海岸线的长期变化进行了审查。根据1998 - 2010年的跨岸剖面资料，分析了多沙坝系统的中期动态。进行了经验正交函数分析，以捕捉系统性沙洲迁移的主要模式。海岸线分析显示了长期侵蚀趋势，并显示季节性变化最近趋于增加。剖面分析表明，砂坝的净离岸迁移已经重复，重现期约为四年。沙坝系统的这种一般行为类似于在世界其他地点观察到的净离岸迁移现象。沙坝配置和中期变化之间的关系，在海岸线的位置，当一个新的酒吧附近的海岸线和一个三重酒吧配置建立，海岸线往往暂时后退，而海岸线的经验，当外部酒吧最进化的进步。
Sandy beaches play a key role in regional tourism. It is important to understand the principal morphological processes behind preserving attractive beaches. In this study, morphological variation on the Chirihama Coast, Japan, an important local tourism resource, was investigated using two sets of field surveys. The objective was to analyze and document the multi-scale behaviors of the beach. First, long-term shoreline changes were examined based on shoreline surveys over the last two decades. Then, the middle-term behavior of multiple bar systems was analyzed based on the cross-shore profile surveys from 1998 to 2010. An empirical orthogonal function (EOF) analysis was conducted to capture the principal modes of the systematic bar migration. The shoreline analysis indicated a long-term eroding trend and showed that the seasonal variation has recently tended to increase. The profile analysis demonstrated that net offshore migrations of bars have been repeated with a return period of approximately four years. This general behavior of the bar system is similar to the net offshore migration phenomena observed at other sites in the world. EOF analysis revealed a relationship between bar configuration and middle-term variations in shoreline location; when a new bar is generated near the shoreline and a triple bar configuration is established, the shoreline tends to temporarily retreat, whereas the shoreline experiences an advance when the outer bar has most evolved.