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Extremity analysis of storm surge for fixing safe design water level

机译:固定安全设计水位的风暴潮极端分析

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Phenomenal storm surge levels associated with cyclones are common in East Coast of India. The coastal regions of Andhra Pradesh are in rapid stride of myriad marine infrastructural developments. The safe elevations of coastal structures need a long-term assessment of storm surge conditions. Hence, past 50 years (1949–1998), tropical cyclones hit the Bay are obtained from Fleet Naval Meteorological & Oceanographic Center, USA, and analyzed to assess the storm surge experienced around Kakinada and along south Andhra Pradesh coast. In this paper, authors implemented Rankin Hydromet Vortex model and Bretschneider’s wind stress formulation to hindcast the surge levels. It is seen from the hindcast data that the November, 1977 cyclone has generated highest surge of the order of 1.98 m. Extreme value analysis is carried out using Weibull distribution for long-term prediction. The results reveal that the surge for 1 in 100-year return period is 2.0 m. Further the highest surge in 50 years generated by the severe cyclone (1977) is numerically simulated using hydrodynamic model of Mike-21. The simulation results show that the Krishnapatnam, Nizampatnam and south of Kakinada have experienced a surge of 1.0, 1.5 and 0.75 m, respectively.
机译:与气旋有关的现象风暴潮水平在印度东海岸很常见。安得拉邦的沿海地区正处于无数海洋基础设施发展的快速步伐。沿海结构的安全高程需要对风暴潮条件进行长期评估。因此,过去50年(1949-1998年),袭击海湾的热带气旋是从美国舰队海军气象和海洋学中心获得的,并进行了分析,以评估在Kakinada附近和南部安得拉邦沿岸的风暴潮。在本文中,作者实施了Rankin Hydromet涡模型和Bretschneider的风应力公式来预测浪涌水平。从后验数据可以看出,1977年11月的气旋产生了最高的1.98 m浪涌。使用Weibull分布进行极值分析以进行长期预测。结果表明,在100年的回报期中有1次的波动为2.0 m。此外,使用麦克21的水动力模型对由强旋风(1977)产生的50年中最高的波动进行了数值模拟。仿真结果表明,克里希纳帕特南(Krishnapatnam),尼桑帕特南(Nizampatnam)和Kakinada以南分别经历了1.0 m,1.5 m和0.75 m的波动。

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