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Thermoelastic deformations due to the annual temperature variation at the tidal station in Vyhne


The comparison of both above mentioned methods was carried out using material from the tidal station P?íbramB?ezové Hory, mine "Anna" (observations with horizontal pendulums) and from the station Sofia (observations with the Askaniagravimetre).


The windinduced sealevel variations at Hakata tidal station in winter are reproduced realistically using a oneway nested model.


The coefficients in the empirical formula were evaluated, based on the measured typhoon surge data at Kenfang Tidal Station.


An empirical typhoon surge formula is proposed in terms of the typhoon wind speed, the typhoon storm radius, and the distance between the typhoon center and the tidal station.

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 This paper deals with the investigation of the data of variation of sea level continuously recorded during many years by 5 tidal stations located along the coast of the Gulf of Bohai. After processing the data and making various corrections, it was found that before the Haicheng Earthquake of 1975 the average sea level showed a ten'dency of steady rise within a broad area. For the recording stations closer to the epicenter of the earthquake, the variation of the sea level became more conspicuous... This paper deals with the investigation of the data of variation of sea level continuously recorded during many years by 5 tidal stations located along the coast of the Gulf of Bohai. After processing the data and making various corrections, it was found that before the Haicheng Earthquake of 1975 the average sea level showed a ten'dency of steady rise within a broad area. For the recording stations closer to the epicenter of the earthquake, the variation of the sea level became more conspicuous and abrupt. However, before the Bohai Earthquake, occurred in the Gulf of Bohai in 1969, the mean sea level was lowered for a long period of time.  对多年来在我国渤海沿岸五个验潮站的海平面连续记录资料进行了各种改正和处理之后,发现1975年海城地震前平均海平面出现大范围稳定持续的上升趋势,震中区附近该平面的变化更为显著,并表现为突发性的变化.但1969年在同区发生的渤海大地震之前,则平均海平面经历了长趋势的下降.  This article describes a mathematical model for the tides in a bay. The objective is to anticipate with this model the effects that closing off of an estuary may have on the tides in an adjoining bay. As the area investigated is 105 km long and 25 to 65 km wide, a depthintegrated, twodimensional model is employed. Schemes for finitedifference computations have been derived by applying the theory ofc haracteristics to the full equations of motion with the convective acceleration terms retained. Altogether... This article describes a mathematical model for the tides in a bay. The objective is to anticipate with this model the effects that closing off of an estuary may have on the tides in an adjoining bay. As the area investigated is 105 km long and 25 to 65 km wide, a depthintegrated, twodimensional model is employed. Schemes for finitedifference computations have been derived by applying the theory ofc haracteristics to the full equations of motion with the convective acceleration terms retained. Altogether 12 types each of land and water boundary conditions have been considered .In the first place, tides in the bay under natural conditions are modeled. By adjusting the resistance coefficient and by proper schematization of the topography of the bay, satisfactory reproduction of the tides can be achieved. Whereas the maximum deviation of the computed tidal stage from the observed is 0.26 m at high tide at a station where the tidal range is 6.20 m., the phases of computed and observed tides are practically identical at all tidal stations.There is a station where depthintegrated current data for a complete tide have been recorded. It is somewhat surprising that the current data are closely modeled in magnitude, phase and direction.On the basis of successful modeling of the natural tides, the closure of the estuary is next simulated and the corresponding tides in the bay computed. It is found that high water at the closure dam will come sooner than under natural conditions and that the high tide is lowered and the low tide elevated so that the tidal range at the closure dam is reduced somewhat.  本文对未忽略非线性加速度项的二维潮汐水力学方程,按特征理论推导出特征差分格式.对杭州湾海区进行了实例计算,算得结果和实测值符合较好.然后再在河口建坝条件下进行计算,并对计算得出的建坝前后杭州湾潮波变化作了分析比较。文末还对计算变量的选取、非线性项影响和边界条件的给定等问题作了初步讨论.  The shanghai gravity tidal station is located at φ=31.1°N, λ=112°.2E, using a gravimeter type GS15 No. 227 installed in a tunnel. The annual mean temperature in the tunnel is 18.8℃, the annual deviation of which is 0.3℃. The scale value of the gravimeter is 2.99 μgal/mm. The data continuously observed from April to August in 1978 (142 days) were analysed by both the methods of Lecolazet and Venedikov. The results of analysis by the method of Lecolazet are as follows:δ(M2) = 1.142, δ(K1) = 1.164, δ(O1)... The shanghai gravity tidal station is located at φ=31.1°N, λ=112°.2E, using a gravimeter type GS15 No. 227 installed in a tunnel. The annual mean temperature in the tunnel is 18.8℃, the annual deviation of which is 0.3℃. The scale value of the gravimeter is 2.99 μgal/mm. The data continuously observed from April to August in 1978 (142 days) were analysed by both the methods of Lecolazet and Venedikov. The results of analysis by the method of Lecolazet are as follows:δ(M2) = 1.142, δ(K1) = 1.164, δ(O1) = 1.192, δ(O1)δ(K1) = 0.028, while that by the method of Venedikav are:0 δ(M2) =1.142, δ(K1) =1.166, δ(O1) =1.189, δ(O1)δ(K1) =0.023.Besides, the accuracy of methods of Lecolazet and Venedikov were tested on the electronic computer DJS18 of the Peking university. The test results are as follows:(1) For method of Lecolazet, the accuracy of determination of gravimetric factor δ of the main waves M2, S2, N2, K1, O1, is about 1%, while the accuracy of determination of the phase difference of the same main wave is about 1°.(2) For method of Venedikov, the accuracy of analysis depends on the length of the observational data, in general the longer the data, the more accurate the result. When the length of the data is 90 days, the accuracy of determination of the gravimetric factor δ of the main waves M2, S2, N2, K1, O1 is about 1% the accuracy of determination of phase difference of the same main wave is about 0.°5  上海重力固体潮台站位于(?)=31.°1,λ=121.°2,利用安装在山洞内的 GS15 NO.227重力仪进行观测.山洞内年平均温度为18.°8C,年温差为0.3℃.重力仪的记录格值为2.99微伽/毫米.利用勒卡拉兹方法和维涅第科夫方法对1978年4月—8月共142日的连续观测结果进行了调和分析.勒卡拉兹调和分析方法所得结果是:δ(M_2)=1.142,δ(K_1)=1.164,δ(O_1)=1.192,δ(O_1)—δ(K_1)=0.028.维涅第科夫调和分析方法所得结果是:δ(M_2)=1.142,δ(K_1)=1.166,δ(O_1)=1.189,δ(O_1)—δ(K_1)=0.023.此外,在北京大学 DJS18电子计算机上对勒卡拉兹调和分析方法和维涅第科夫调和分析方法进行了精度检验.检验结果是:1)勒卡拉兹方法对 M_2、S_2、N_2、K_1和 O_1五个主要波群来说,确定δ的精度约为1%,确定相位差的精度约为1°.2)维涅第科夫方法的精度与资料长度有关.一般说来,资料越长,精度越高.当资料长度取为90天时,对 M_2、S_2、K_1、O_1,五个波群来说,确定δ的精度约为1%,确定位相差的... 上海重力固体潮台站位于(?)=31.°1,λ=121.°2,利用安装在山洞内的 GS15 NO.227重力仪进行观测.山洞内年平均温度为18.°8C,年温差为0.3℃.重力仪的记录格值为2.99微伽/毫米.利用勒卡拉兹方法和维涅第科夫方法对1978年4月—8月共142日的连续观测结果进行了调和分析.勒卡拉兹调和分析方法所得结果是:δ(M_2)=1.142,δ(K_1)=1.164,δ(O_1)=1.192,δ(O_1)—δ(K_1)=0.028.维涅第科夫调和分析方法所得结果是:δ(M_2)=1.142,δ(K_1)=1.166,δ(O_1)=1.189,δ(O_1)—δ(K_1)=0.023.此外,在北京大学 DJS18电子计算机上对勒卡拉兹调和分析方法和维涅第科夫调和分析方法进行了精度检验.检验结果是:1)勒卡拉兹方法对 M_2、S_2、N_2、K_1和 O_1五个主要波群来说,确定δ的精度约为1%,确定相位差的精度约为1°.2)维涅第科夫方法的精度与资料长度有关.一般说来,资料越长,精度越高.当资料长度取为90天时,对 M_2、S_2、K_1、O_1,五个波群来说,确定δ的精度约为1%,确定位相差的精度为0.°5.   << 更多相关文摘 
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