摘要
岛屿间电力输送依赖于海缆,台风暴潮流作用下海床冲刷对海缆安全构成威胁。在某海域电缆周围采集了83个沉积物样本,粒度分析显示主要为黏土质粉砂,均方差为3~5。基于孙志林公式计算了研究区域若干粒级泥沙的起动流速,首次提出海缆周围冲刷区划分方法,即根据最大流速与起动流速之比(相对流速)划分出四种冲刷区。结合2106号和5612型台风风暴潮数值模拟,揭示了海缆海域相对流速的空间分布规律,结果表明,2106台风期间位于中、强冲刷区的海缆长度分别占27.8%和9.3%,具有一定的冲刷裸露风险,若台风强度达到5612级别,则在2.5 km、8 km和32 km处相对流速达1.6以上,海缆裸露风险高于2106台风。对强冲刷区海缆宜重点加以防护。
The inter-island power transmission relies on submarine cables,which are threatened by seabed scouring by typhoon-driven currents.In this study,83 sediment samples were collected around a submarine cable,and particle size analysis showed that the sediments are predominantly clayey chalk with a mean square deviation of 3 to 5.Incipient velocities for various sediment fractions were calculated using Sun's formula.A new method was proposed to classify scour areas into four categories based on the ratio of the maximum flow velocity to incipient velocity,referred to as the relative velocity.By combining the approach with the numerical simulations of storm surges induced by Typhoon 2106 and 5612,the spatial distribution of relative velocity in the submarine cable sea was determined.Results show that during Typhoon 2106,27.8%and 9.3%of the cable length lie within medium and strong scour areas,respectively,posing a potential risk of scour exposure.When typhoon intensity reaches 5612,the relative current velocity at 2.5 km,8 km and 32 km exceeds 1.6,indicating a higher risk of cable exposure compared to typhoon 2106.These findings highlight the need to prioritize protection measures in regions prone to strong scour.
作者
丛贇
丁凯璇
孙志林
闫循平
陈范君
康纬
CONG Yun;DING Kaixuan;SUN Zhilin;YAN Xunping;CHEN Fanjun;KANG Wei(State Grid Zhejiang Electric Power Co.,Ltd.Zhoushan Power Supply Company,Zhoushan 316000,China;Ocean College Zhejiang University,Zhoushan 310058,China)
出处
《海洋通报》
北大核心
2025年第3期336-343,共8页
Marine Science Bulletin
关键词
黏性非均匀沙
起动流速
台风暴潮流速
冲刷区
海底电缆
cohesive nonuniform sediment
incipient velocity
storm current velocity
scour area
submarine cable
作者简介
丛贇(1987-),本科,主要从事电气工程管理,电子邮箱:congyun1987@gmail.com;通信作者:孙志林,教授,博导,主要从事水沙动力学与河口海岸数值模拟研究,电子邮箱:oceansun@zju.edu.cn。
