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铁山湾内天文潮对风暴潮水位的影响研究
杨万康1,2, 冯兴如3, 尹宝树3, 杨青莹1
1.自然资源部第二海洋研究所 浙江杭州 310012;2.自然资源部海洋空间资源管理技术重点实验室 浙江杭州 310012;3.中国科学院海洋研究所海洋环流与波动重点实验室 山东青岛 266071
摘要:
作为半封闭狭长海湾,铁山湾受风暴潮灾害的影响较为严重。根据多年观测资料和数值模型对铁山湾内的风暴潮水位特征进行了研究。观测资料表明海湾内风暴潮峰值水位受天文潮相位影响较为显著,然后基于ADCIRC风暴潮模型和1409号“威马逊”台风参数,定量评估了天文潮对风暴潮水位的影响。模拟结果表明当考虑天文潮作用时,会显著提高模拟结果精度,然后通过数值实验研究了风暴潮与不同相位天文潮相互作用时的水位变化特征。数值实验结果表明天文潮-风暴潮相互作用引起的非线性水位在涨潮阶段不明显,在高潮位时非线性水位达到负值最大;在落潮时达到正值最大。风暴潮增水峰值由于受到这种非线性效应的影响,在高潮位时数值最小。海湾内非线性作用要远大于外部,非线性效应越强,总水位峰值相对于天文潮高潮位的延迟时间也就越长。
关键词:  风暴潮模型  “威马逊”台风  天文潮相位  非线性水位
DOI:10.11693/hyhz20211100288
分类号:P731.2
基金项目:浙江省自然科学基金资助项目,LQ20D060003号;NSFC-山东省政府联合基金,U1806227号。
THE TIDAL EFFECT ON STORM SURGE LEVEL IN TIESHAN BAY, SOUTH CHINA SEA
YANG Wan-Kang1,2, FENG Xing-Ru3, YIN Bao-Shu3, YANG Qing-Ying1
1.Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China;2.Key Laboratory of Ocean Space Resource Management Technology, Ministry of Natural Resources, Hangzhou 310012, China;3.Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Science, Qingdao 266071, China
Abstract:
As a semi-enclosed narrow bay, the Tieshan Bay, Guangdong, South China suffers from storm surge seriously. The characteristics of storm surge level in the bay were investigated based on years of observational data by numerical modeling. Observational data show that the storm surge peak level was significantly affected by tide. Based on the ADCIRC storm surge model and the parameters of No.1409 typhoon Rammasun, the impact of the astronomical tide on the storm surge peak level is quantitatively evaluated. The simulation results indicate that when astronomical tides were considered, the accuracy of the model could be greatly improved. Numerical experiments were conducted to study the surge peak level superimposed with different phase of tidal levels. Numerical experiment results suggest that nonlinear level reaches the maximum negative value at high tide and maximum positive value at falling tide. Due to the effect of tide-surge interaction, the peak level of storm surge is the smallest at high tide level. The nonlinear effect inside the bay is much greater than those outside. The lag time of the maximum total level relative to the high tide lengthens when the nonlinear effect increases.
Key words:  storm surge model  typhoon Rammasun  phase of tide  nonlinear level
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