朱磊,杨燕雄,杨雯,房克照.工程养护海滩对“803”风暴潮的响应过程研究[J].海洋通报,2019,(1):102-14
工程养护海滩对“803”风暴潮的响应过程研究
Study on the response process of nourished beach to "803" storm surge
投稿时间:2018-05-17  修订日期:2018-07-04
DOI:10.11840/j.issn.1001-6392.2019.01.014
中文关键词:  老龙头  海滩养护  人工沙坝  “803”风暴潮  XBeach  响应过程
英文关键词:Laolongtoul  beach nourishment  sandbar  "803"Storm Surge  XBeach  response process
基金项目:国家自然科学基金 (51579034;51779022)
作者单位E-mail
朱磊 河北省地矿局第八地质大队河北 秦皇岛 066000河北省海洋地质资源调查中心河北 秦皇岛 066000 siriusn@126.com 
杨燕雄 河北省地矿局第八地质大队河北 秦皇岛 066000河北省海洋地质资源调查中心河北 秦皇岛 066000  
杨雯 国家海洋局秦皇岛海洋环境监测中心站河北 秦皇岛 066000  
房克照 大连理工大学 海岸和近海工程国家重点实验室辽宁 大连 116024  
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中文摘要:
      研究养护海滩对风暴潮的响应过程在人工养滩工程设计与施工中具有重要意义。老龙头养护海滩在竣工半个月后遭遇“803”风暴潮,导致岸滩滩肩最大蚀退 6.5 m,沙坝坝顶最大下蚀 1.2 m。在现场测量的基础上,利用 XBeach 建立风暴潮过程 的老龙头海滩海床演变模型,研究结果表明: (1) XBeach 模拟结果与实际地形变化侵淤趋势一致,风暴潮期间人工沙坝均向岸移动,但模拟结果的侵蚀程度更大,海滩响应更加剧烈; (2) 强浪条件下人工沙坝的透射系数为 0.29~0.42,常浪条件下透射系数为 0.45~0.95,因而人工沙坝在大浪条件下掩护作用更佳; (3) 风暴潮期间人工沙坝附近破波显著,坝顶流速明显增大,最大可达 1.21 m/s,是无人工沙坝情况下的 2.3 倍,而在人工沙坝向岸侧,因波能提前耗散,流速减为 0.28 m/s,是无人工沙坝时的 0.4 倍,且没有产生离岸流。老龙头养护工程整体泥沙损失较少,易于恢复.
英文摘要:
      Investigation on the responses of the nourished beach to storm surge is of great importance to the design and construction of the beach nourishment project. Laolongtou Beach, one of the famous tourist sites in Qinhuangdao, suffered from "803" storm surge just half a month after the completion of nourishment, which led to horizontal maximum recession of 6.5 m at berm and height reduce of 1.2 m at sandbar crest. Based on the field measurements, the morphological evolution of Laolongtou Beach under the storm surge is modeled using XBeach model. Compared with the field measurements, the XBeach model predicts the correct locations of deposition and erosion, shoreward moving of the sandbar during the storm, but over -predicts erosive amount. The transmission coefficient of the sandbars is 0.29 ~0.42 under storm wave condition and 0.45~0.95 under common wave condition, indicating a better shielding effect for large waves. As the storm surge propagates to the sandbars, significant wave breaking is captured with radical increase in the velocity at the sandbar crest with the maximum value of 1.21 m/s which is about 2.3 times the value in natural condition i.e. at same location without the sandbar. The mean velocity at the lee of the sandbars reduces to 0.28m/s, 0.4 times that in natural condition, due to the intensive wave breaking at the sea side of the sandbars. And there is no rip current beside the sandbars. Overall, lost sand is confined within a controlled area, thus the restoration is manageable of the nourishment in Laolongtou Beach.
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