强潮海滩响应威马逊台风作用动力沉积过程研究——以北海银滩为例
发布时间：2018-08-13 18:00
【摘要】：研究台风影响下的海滩沉积过程不仅可加深极端海况下的海滩冲淤变化理解,而且有利于海滩资源的保护与海岸工程保护。以强潮海滩——北海银滩为例,通过采集北部湾海区1409号威马逊超强台风作用前后的沉积物、剖面高程及水文资料,探讨强潮海滩的动力沉积过程。结果表明:1)台风作用前后的海滩沙丘-滩肩-沙坝体系的地貌状态基本不变,其中沉积物组分均为砂,细砂、极细砂和中砂三组分平均含量占所有组分的95%以上;与台风作用前比较,台风后的地貌在维持先前形态的条件下,发生局部侵蚀和后退,沉积物相对变粗且细砂含量增加了10%。2)台风作用后后滨沙丘侵蚀,且沉积物滚动组分增加;冲流带和滩肩前缘沉积物的搬运由双跳跃转为单一的跳跃形式。3)台风作用前后的海滩沉积物主要变化过程可由两个模态表征,其中主要模式反映了台风作用前后的海滩以细砂为主的动力沉积变化特征,该模式受控于区域波浪和潮汐的长期耦合作用,并以波浪为主导因素。台风作用前的次要模式反映潮汐作用控制下的海滩沉积横向振荡特征;台风作用后的次要模式表征了台风影响下的海滩横向沉积物偏粗、冲流带-低潮带振荡及其沉积分异过程。
[Abstract]:The study of beach sedimentation process under the influence of typhoon can not only deepen the understanding of beach scour and siltation under extreme sea conditions, but also benefit the protection of beach resources and coastal engineering. Taking the strong tidal beach-Beihai Silver Beach as an example, the dynamic deposition process of the strong tidal beach was discussed by collecting the sediment, profile elevation and hydrological data before and after the action of the 1409 Vermaeson Super Typhoon in the Beibu Gulf Sea area. The results show that the geomorphologic state of beach dune-beach shoulder-sand dam system before and after typhoon is basically unchanged, and the average contents of sediment components are sand, fine sand, very fine sand and medium sand, which account for more than 95% of all the components. Compared with that before typhoon, local erosion and receding occurred in the geomorphology after typhoon, and the sediment became thicker and the fine sand content increased by 10.2) after typhoon, sand dune erosion and sediment rolling component increased. The main changes of beach sediments before and after typhoon action can be characterized by two modes. The main model reflects the dynamic sedimentary characteristics of the beaches before and after typhoon action, which is controlled by the long-term coupling of regional waves and tides, and the wave is the dominant factor. The secondary model before typhoon action reflects the characteristics of lateral oscillation of beach sediment under the control of tidal action, and the secondary model after typhoon action indicates that the beach lateral sediment under typhoon action is coarse. The oscillations and sedimentary differentiation processes of the scouring zone and the low tide zone.
【作者单位】： 广西北部湾海岸科学与工程实验室;华东师范大学河口海岸学国家重点实验室;
【基金】：国家自然科学基金(41376097,41666003) 广西自然科学基金(2015GXNSFBA139207) 2015广西高等学校科学研究人文社科重点项目(KY2015ZD133)
【分类号】：P737.1;P748
，
本文编号：2181758
[Abstract]:The study of beach sedimentation process under the influence of typhoon can not only deepen the understanding of beach scour and siltation under extreme sea conditions, but also benefit the protection of beach resources and coastal engineering. Taking the strong tidal beach-Beihai Silver Beach as an example, the dynamic deposition process of the strong tidal beach was discussed by collecting the sediment, profile elevation and hydrological data before and after the action of the 1409 Vermaeson Super Typhoon in the Beibu Gulf Sea area. The results show that the geomorphologic state of beach dune-beach shoulder-sand dam system before and after typhoon is basically unchanged, and the average contents of sediment components are sand, fine sand, very fine sand and medium sand, which account for more than 95% of all the components. Compared with that before typhoon, local erosion and receding occurred in the geomorphology after typhoon, and the sediment became thicker and the fine sand content increased by 10.2) after typhoon, sand dune erosion and sediment rolling component increased. The main changes of beach sediments before and after typhoon action can be characterized by two modes. The main model reflects the dynamic sedimentary characteristics of the beaches before and after typhoon action, which is controlled by the long-term coupling of regional waves and tides, and the wave is the dominant factor. The secondary model before typhoon action reflects the characteristics of lateral oscillation of beach sediment under the control of tidal action, and the secondary model after typhoon action indicates that the beach lateral sediment under typhoon action is coarse. The oscillations and sedimentary differentiation processes of the scouring zone and the low tide zone.
【作者单位】： 广西北部湾海岸科学与工程实验室;华东师范大学河口海岸学国家重点实验室;
【基金】：国家自然科学基金(41376097,41666003) 广西自然科学基金(2015GXNSFBA139207) 2015广西高等学校科学研究人文社科重点项目(KY2015ZD133)
【分类号】：P737.1;P748
，
本文编号：2181758
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