| Effect of Sea Level Variation on Tidal Characteristic Values for the East China Sea |
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| 作者姓名： | 于宜法 俞聿修 左军成 万振文 陈宗镛 |
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| 作者单位： | The State Key Laboratory of Coastal and Offshore Engineering，The State Key Laboratory of Coastal and Offshore Engineering，Oceanography Department，First Institute of Oceanography，Oceanography Department Dalian University of Technology，Dalian 116024，China，Dalian University of Technology，Dalian 116024，China，Ocean University of China，Qingdao 266003，China，State Oceanic Administration，Qingdao 266003，China，Ocean University of China，Qingdao 266003，China |
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| 基金项目： | ThisprojectwasfinanciallysupportedbytheNationalNaturalScienceFoundationofChina (GrantNo .4 990 6 0 0 1),theExcellentYoungTeacherAwardFoundationoftheMinistryofEducationMinistry (Grant [2 0 0 0 ]No .6 ),andtheExcellentScholarAwardFoundationofShandongP |
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| 摘 要： | 1 .IntroductionTheglobalairtemperatureroseabout 0 .5～ 0 .6°Coverthepast 2 0thcentury ,andtheglobalmeansealevelincreasedbyabout2 0cmduringtheperiod .Theregionalmeansealevelriseswiththerisingglobalmeansealevel.Zuoetal.( 1 997)indicatedthatthemeanrisingrateofabsolutemeansealevelalongtheChinacoastontheassumptionofunifiedisostaticdatumis 2mm a .Woodworth( 1 999)analyzedsealevelspanning 1 76 8tothepresentinLiverpool,andobtainedaseculartrendforheperiodupto 1 880of0 .39± 0 .1 7mm a ,andatrendfort…
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Effect of Sea Level Variation on Tidal Characteristic Values for the East China Sea |
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| YU Yi-fa a,YU Yu-xiua,ZUO Jun-chengb,WAN Zhen-wenc and CHEN Zong-yongb aThe State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian ,China bOceanography.Effect of Sea Level Variation on Tidal Characteristic Values for the East China Sea[J].China Ocean Engineering,2003,17(3). |
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| Authors: | YU Yi-fa a YU Yu-xiua ZUO Jun-chengb WAN Zhen-wenc and CHEN Zong-yongb aThe State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian China bOceanography |
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| Institution: | YU Yi-fa a,1,YU Yu-xiua,ZUO Jun-chengb,WAN Zhen-wenc and CHEN Zong-yongb aThe State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China bOceanography Department,Ocean University of China,Qingdao 266003,China cFirst Institute of Oceanography,State Oceanic Administration,Qingdao 266003,China |
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| Abstract: | Tidal waves in the East China Sea are simulated numerically with POM(Princeton Ocean Model) model for normal mean sea level, 30 cm higher, 60 cm higher, and 100 cm higher, respectively, and the simulated result is compared with the harmonic analysis result of hourly sea level data from 19 tide gauges for more than 19 years. It is indicated that the long-term mean sea level variation affects notably tidal waves in this region. Generally, the tidal amplitude increases when the mean sea level rises, but this relationship may be inverse for some sea areas. The maximal variation of tidal amplitude takes place in the zones near the Fujian coast and the Zhejiang coast, rather than the shallowest Bohai Sea. The maximum increase of M2 amplitude can exceed about 15 cm corresponding to the 60 cm rise of the mean sea level along the Fujian coast. The other regions with large variations of tidal amplitude are those along the Jiangsu coast, the south-east coast of Shandong, and the south-east coast of Dalian. The propagation of tidal waves is also related to mean sea level variation, and the tidal phase-lag decreases generally when the mean sea level rises. Almost all the regions where the tidal phase-lag increases with rising mean sea level are close to amphidromic points, meanwhile the spatial area of such regions is very small. Because the influence of mean sea level variation upon tidal waves is spatially marked, such spatial effect should be considered in calculation of the tidal characteristic value and engineering water level. In the region where the amplitudes of the major tidal constituents increase, the probable maximum high water level becomes higher, the probable maximum low water level becomes lower, and both design water level andcheck water level increase obviously. For example, the design water level at Xiamen increases by 13.5 cm due to the variation of tidal waves when the mean sea level rises 60 cm, the total increase of design water level being 73.5 cm. |
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| Keywords: | East China Sea mean sea level tidal wave variation tidal characteristic value engineering water level |
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