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渤海风暴潮增减水及流场时空特征初步研究 (李鑫)

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渤海风暴潮增减水及流场时空特征初步研究水利论文5C~cvj}/A

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【作者】李鑫 【导师】刘家驹; 张金善水利论文f }W ]4l DyJ:w)w
【作者基本信息】南京水利科学研究院,港口、海岸及近海工程,2007年,硕士

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【中文摘要】 风暴潮是我国沿海地区最严重的海洋灾害之一。本文简要分析渤海风暴潮的特点以及风暴潮对沿海的影响,总结了渤海风暴潮研究进展。在此基础上,建立了渤海邻近海域天文潮及风暴潮数学模型,对渤海天文潮进行了验证计算,验证结果较为理想;并以2003年10月温带风暴潮、9711台风暴潮为例,对影响渤海海域的两类风暴潮进行了数值计算研究,分析了其造成的风暴潮增减水及其引起的潮流场的时空分布特征。对温带风暴潮数值计算结果表明,模型较好地模拟了温带风暴潮的发生、发展和消失的过程,由于温带气旋具有作用时间长、强度大的特点,引起的增减水范围大,增水从渤海湾向莱州湾方向传播,辽东湾减水,渤海湾、莱州湾增水;同时,引起了渤海潮流系统发生了较大变化,局部往复流转化为单一方向为主的潮流运动,局部旋转流的椭圆长短轴之比发生了变化。通过对9711台风暴潮的数值模拟,对台风暴潮的数值计算结果表明,由于热带气旋引起的风暴潮时间短、强度大、方向变化快的特征,增减水的范围与温带风暴潮相比减小,对流场的影响的幅度也小于温带风暴潮。本文还分析了两类风暴潮的非线性效应水位波动,指出在水深较浅,潮差较大的近海海域,非线性效应造成的增、减水是...更多不可忽略的,且引起的水位波动呈周期性,与天文潮周期接近。最后,对课题研究存在的问题及进一步的工作给出了展望。  还原

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【英文摘要】 Storm surge is one of the most serious oceanic disasters in coastal zone in China.First, a comprehensive literature review is conducted and analyzed on the storm surgein Bohai Sea area. Then a numerical model of astronomical tide and storm surge areconstructed. The model is verified and calibrated with astronomical tide, and theresults are reasonable agree with the predicted values in tidal table. At last, the modelis applied to simulate the temperate zone storm surge in Oct. 2003 and typhoon stormsurge No.9711. Analyzed are the water level fluctuation and the spatial-temporalvariation of the flow field due to the surges.The influence of the evolution processes are modeled for extratropical stormsurge. Due to the long duration and strong intensity of the temperate zone cyclone, thearea with water level fluctuation is large. Under the effect of the surge, the sea wateris driven from Laizhou bay to Bohai bay, as a result, there is negative setup inLiaodong bay and setup in both Laizhou b...更多ay and Bohai bay. Meanwhile, due to thetemperate zone cyclone, the tidal flow of Bohai Sea varies greatly. The local reversingtidal current is changed to unidirectional flow, and the ratio of local rotary tidalcurrent ellipse's major and minor axis changes too.The numerical simulation is conducted for typhoon storm surge No.9711. Thearea with water level fluctuations and the influences on flow field are smaller thanthose of the extratropical storm surge. This may be due to the fast varied directions ofthe typhoon.The nonlinear interaction between astronomical tide and storm surge areanalyzed for the water level fluctuations of extratropical and typhoon storm surge.The water level fluctuations due to nonlinear interaction can not be neglected in theoffshore zone with shallow water and large tidal ranges. The water level fluctuationshave a period close to the astronomical tidal period. The problems remained and somerecommendations for the future research are summarized at last.  还原

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.nQB0q!g(U}S0【中文关键词】 渤海; 温带风暴潮; 台风风暴潮; 增、减水过程; 流场变化; 非线性效应水利论文 jcvL2y ~
【英文关键词】 Bohai Sea; ADI method; extratropical storm surge; typhoon storm surge; water level fluctuations; flow field variation; nonlinear interaction
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TAG: 流场 李鑫 风暴潮 渤海 时空
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