共查询到20条相似文献，搜索用时 15 毫秒
1.
P. A. Stunzhas 《Oceanology》2016,56(6):782-788
The Aral Sea is an important water area both for monitoring and oceanological studies, because its salinity and salt composition strongly differ from the oceanic. We offer a semiempiric calculation method of electric conductivity and the coefficient of its temperature dependence k judging from the ionic composition of water. The properties of the solution are considered as the sum of properties of seven binary salts taken based on the ionic composition of the solution. The MgSO4 concentration is thought to be the highest possible, which makes the salt concentration nearly unambiguous. In a salinity range of 46–120‰ and temperature range of 5–25°C (2002–2009), the standard deviation of the calculated and measured electric conductivity was 2.9%. To refine the calculation of salinity from electric conductivity measurements using the “oceanic” formula, we suggest its preliminary reduction to a constant temperature (20°C) using the measured or calculated coefficient k. 相似文献
2.
Lu Jianghua Xie Shileng
Engineer Planning Design Institute for Water Transportation Ministry of Communications Beijing Professor Senior Engineer First Design Institute of Navigation Engineering Ministry of Communications Tianjin 《中国海洋工程》1996,(4)
- By applying the theory of structural reliability, reliability analyses for the stability of a breast wall on the top of a sloping breakwater are carried out. Based on the analyses, the method for determining partial action / load factors and partial resistance factors of breast walls is expounded, and the design expressions with partial factors are given. The values of partial action / load factors and partial resistance factors are recommended preliminarily according to the computation for breast walls with typical cross-sections. 相似文献
3.
Bao Chenglan 《海洋学报(英文版)》1988,7(1):43-56
There were 8 typhoons over the northwestern Pacific Ocean in August of 1985. Their movement characteristics were mainly northward or recurvature northward. At the same time, a complex movement of 3 typhoons clustering was observed. In this paper, the typhoon movement tendency is studied by using satellite cloud maps. The westward and northward tendencies can be distinguished clearly. Based on this rule, typhoon movement can be forecasted 12-48 h before. Some characteristics models of the typhoon moving northward or recurving northward on the satellite cloud maps are also given in this paper. 相似文献
4.
From 1979 to 1989, the current Qingshuigou course of the Huanghe River formed a sub - delta which resembles a beak extending into the Laizhou Bay. It covers 618 km2 in area. To meet the needs of developing and constructing the Huanghe River Delta and under the presupposition of keeping the current course for 15-20 a, we forecast mainly by using the OM (1, 1) model that the front border of the sub-delta will be close to 119°30'E and its area will become 923 km2by the end of the year 2000. The Huanghe River will make land 760 km2 in area. 相似文献
5.
Analysis of characteristics and mechanism of current system on the west coast of Guangdong of China in summer 总被引：1，自引：2，他引：1
On the basis of data of drifting bottles＇ tracks and the current measured in anchored stations, as well as temperature and salinity observed in cruise investigations and coastal stations, ADCP current data and AVHRR surface sea temperature （SST） data on the western coast of Guangdong, synthetic results of analysis showed that the coastal currents in the west of the mouth of the Zhujiang River were mainly westward in summer, which constituted the north branch of cyclonic gyre in the east of the Qiongzhou Straits. Part of its water flowed westward into the Beibu Gulf through the Qiongzhou Straits. The coastal current pattern was not identical with the traditional current system which flowed westward in the Qiongzhou Straits in winter and eastward in summer. The summertime＇s coastal current was always westward, maybe temporarily turning northeast only when the southwest wind was strong. The important characteristics of coastal current on the western coast of Guangdong, in the Qiongzhou Straits and in the north of the Beibu Gulf were analyzed and their mechanisms also were explained. 相似文献
6.
FAN Zhisong 《海洋学报(英文版)》2005,24(5):50-60
1 IntroductionThe study of SAR remote sensing of surface wake of a semi-elliptical submerged body is of great importance actually in the ocean. The dynamics and the SAR remote sensing mechanism of this wake are very complicated. Numerous researches (Bergmann et al., 1958; Miles, 1968a,b; Huppert and Miles, 1969; Bon-neton et al., 1993) indicate that in the ocean the imagery and dynamics of this wake are quite different when a semi-elliptical submerged body moves horizontally at high speed … 相似文献
7.
-At present, it is still difficult to obtain an accurate maximum wind speed of typhoon with modern means,such as satellite survey , radar tracing and airplane reconnaissance. The performance of statistical equation established with observational maximum wind speed and the central pressure of typhoon is unstable ,and it is unreliable in operational use. Therefore a general pressure field model of typhoon is introduced in this paper based on atmospheric motion equations and formulas are derived for computing the maximum wind speed around typhoon center over sea surface . The theoretical curves derived from these formulas are in good agreement with those using the statistic empirical curves of typhoon pressure-wind relations over the western Pacific. Tests were conducted for typhoons which occurred in 1973 and in 1983 and the strongest typhoons selected each year during 1970 and 1978,the results were satisfactory. Meanwhile the analyses of computing results showed that the effect of Coriolis force could be 相似文献
8.
Milovsky G. A. Ishmukhametova V. T. Shemyakina E. M. 《Izvestiya Atmospheric and Oceanic Physics》2017,53(9):1101-1111
Izvestiya, Atmospheric and Oceanic Physics - The methods of a complex analysis of materials of space, gravimetric, and magnetometric surveys were developed on the basis of a study of reference... 相似文献
9.
The Nampo dike, which is located at the west coast of Korea, was destroyed by wave overtopping during the storms on 30 August and 17 September in 1959. In this paper, is performed the probabilistic assessment of wave overtopping of Nampo dike by use of Owen model, Van der Meer ＆ Janssen model and Hedges ＆ Reis model for wave overtopping of seawall. Based on the available tidal and wave data for storm surges in 1989, the risk assessment of wave overtopping of the Nampo dike has been carried out by both Level Ⅱ and Level Ⅲ reliability methods. The calculated resuhs show the general agreement of failure probability between the two methods. By utilizing the rehabilitated cross section of Nampo dike, the failure probability of wave overtopping for the Nampo dike after rehabilitation will be rapidly reduced to that of initial design at crest level of 9.0 m with the improved slope from 1 ： 2 to 1 ： 4 at seaside. Since the sea level may only rise 1.0 m in the next few decades, the failure probability of Nampo dike will be still in the safe range. 相似文献
10.
After the single-strain abilities of organic-pollutant-degrading bacteria in bioremediation of sediment environment of shrimp culture are determined, the multistrain degrading effect of the compositions of different strains is measured. The results indicate that the multi-strains groups have higher degrading ability than the single-strain groups. Three-strain groups are better than two-strain groups, and fourstrain groups are better than three-strain groups and five-strain groups, the groups composed of strains Lt7222, Lt7511. Fc6308 and Gy7018 has the best degrading effect, the CODMn removal rate is 73.2 % in 66 h, and gets to 82.7% in 114 h. 30% higher than that of the best single-strain group; Groups of Lt7222. Lt7511. Lt7451 and Gy7018 are the second, whose CODMn removal rate is 82.1% in 114 h. It is suggested that multi-species bacteria be used as thnctional bacteria in bioremediation of mariculture environment. 相似文献
11.
Suppression of Wave-Excited Vibration of Offshore Platform by Use of Tuned Liquid Dampers 总被引：3，自引：0，他引：3
This paper describes experimenlal and theoretical investigations of Tuned Liquid Damper (TLD) characteristics tor suppressing the wave-excited structural vibration. The structural model lor the experiments is scaled according to a full size offshore platform by matching their dynamic properties. Rectangular TLDs of different sizes with partially filled liquid are examined. By observing the performance and behavior of TLDs through laboratory experiments, the study investigates the influence of a number of parameters, including container size, container shape, frequency ratio, and incident wave characteristics. In an analytical study, a mathematical model that describes the nonlinear behavior of liquid in TLD and the interaction of TLD and structure is prerequisite. The validity of the model is evaluated and simulating results can reasonably match the corresponding experimental results. 相似文献
12.
Measurement of nuclides of uranium and thorium series of disequilibrium using γ-spectroscopy 总被引：3，自引：0，他引：3
ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｒａｄｉｏｎｕｃｌｉｄｅｓｏｆｎａｔｕｒａｌｕｒａｎｉｕｍａｎｄｔｈｏｒｉｕｍｓｅｒｉｅｓｃａｎｂｅｕｓｅｄｔｏｔｒａｃｅｍａｒｉｎｅｐｒｏ ｃｅｓｓｏｆｖａｒｉｏｕｓｔｅｍｐｏｒａｌａｎｄｓｐａｔｉａｌｓｃａｌｅａｎｄｐｒｏｐｅｒｔｉｅｓｔｈａｔｐｒｏｖｉｄｅｐｌｅｎｔｉｆｕｌｉｎｆｏｒｍａｔｉｏｎａｂｏｕｔｐｈｙｓｉｃｓ,ｃｈｅｍｉｓｔｒｙ ,ｇｅｏｓｃｉｅｎｃｅａｎｄｂｉｏｌｏｇｙｏｆｏｃｅａｎｂｅｃａｕｓｅｔｈｅｙｈａｖｅｄｉｆｆｅｒｅｎｔｃｈｅｍｉｃａｌｐｒｏ… 相似文献
13.
In this paper,the dynamic response of undersea -+towed systems is numerically simulated.Atwo body towed system is especially considered in detail.The factors influencing the heave oftowed-bodies,such as the weight of the towed-body(in sea water),the length and the weight(in sea water)per unit length of the cable between towed-bodies and towing ship,are investigated in detail.Calculationsshow that the two-body towed system can greatly increases the stability of the towed system. 相似文献
14.
- Studies on the erosion processes and protective measures at the downcoast of the Friendship Port in Mauritania have been successfully conducted by means of 3-D movable-bed model using light model-sand. The headland control was accepted for the stability of the beach. This paper mainly deals with the shape, orientation, size and erosion depth of the artificial headland. Various forms of headland projects, such as the normal groin, arch groins bending to upcoast ancj to downcoast, offshore breakwater, and T-shaped dike, have been experimentally investigated. Through a comparison of effects of these works on the beach processes, optimized headlands have been obtained, that is, unsymmetrical T-shaped dike or arch groin bending to the downcoast, which has been practically and successfully applied for the stability of beaches. 相似文献
15.
A numerical model is developed by use of the boundary integral equation method to investigate the responses of a two-dimensional floating structure.The structure under consideration consisting of two pontoons,is connected by a rigid framework,and linked to the sea floor by a mooring system.The theoretical conception is based on potential theory with linear external forces,and applied to an arbitrarily shaped body and water depth.The discussion includes the influence of draft and space between pontoons on the responses of the floating structure.Finally,the validity of the method is adequately verified by experimental results. 相似文献
16.
徐立论 《海洋学报(英文版)》1986,5(1):147-147
The development of the offshore industry on a world-wide basis has given rise to thegrowing demand for a good knowledge and understanding of the ocean wave environment.In addition to the accepted probabilistic and spectral methods of defining wave climate,attention has recently focussed on wave groups-a series of waves on enhanced amplitudeoccurring in close sequence. Such an occurrence is important in a range of offshore andcoastal engineering problems, particularly in the dynamic response of compliant offshore sys-tems and the stability of breakwaters. The paper presents a brief review of the previous work on wave groups, followed by 相似文献
17.
Studies on morphocytology of Planktoniella and correction of nomenclature of Valdiviella formosa (Sc
《海洋学报(英文版)》1997,(2)
ＢａｓｅｄｏｎｔｈｅｍｏｒｐｈｏｃｙｔｏｌｏｇｉｃａｌｓｔｕｄｉｅｓｏｎＰｌａｎｋｔｏｎｉｅｌｌａ，ｔｗｏｓｐｅｃｉｅｓｏｆｔｈｅｇｅｎｕｓ，ｐ．ｓｏｌＳｃｈｕｔｔａｎｄＰ．ｆｏｒｍｏｓａ（ＱｉａｎｅｔＷａｎｇ）ａｒｅｒｅｃｏｒｄｅｄｉｎＣｈｉｎａ＇ｓｓｅａｓ．ＴｈｅｒｅｎａｍｉｎｇｏｆｔｈｅｌａｔｔｅｒｓｐｅｃｉｅｓｉｓｂａｓｅｄｏｎａｃａｒｅｆｕｌｓｔｕｄｙｏｎＶａｌｄｉｖｉｅｌｌｌａｆｏｒｍｏｓａ（ＳｃｈｉｍｐｅｒｅｘＫａｒｓｔｅｎ）Ｋａｒｓｔｅｎ． 相似文献
18.
Wang Jinxing Liu Changbin Zhang Hongwei Zhao Shuangyi Zhang Yanjun Zhao Jing 《海洋学报(英文版)》1998,17(4):531-536
ThisworkisfundedbyagrantfromtheNationalKeyTaskProjectsof8thand9thFive-yearplanprogram.INTRODUCTIONInthepastyears,studiesonthevirusesofpenaeidshrimpshavemadegreatprogressinvari-ouscountries.Rightnow,aboutl4virusesofpenaeidshrimpswerefound,i.e.BP(Baculoviruspenaei,Couch,1974),MBV(Penaeusmonndonbaculovirus,Lightneretal.,1983)orPBV(Penaeusplebejusbaculovirus,Lesteretal.,1987),BMN(Baculovirusmidgutglandnecrosisvirus,Sanaetal.,1981),PHRV(Penaeushybridrod-shapedvirus,Owensetal.,199l),… 相似文献
19.
We have performed a simulation of the convectively induced ascent of the gas–dust cloud formed during the atmospheric passage and explosion of the Chelyabinsk meteoroid. The acceleration, velocity, and rise of the gas–dust cloud have been described as functions of time and altitude. The time of dust settling in the atmosphere has been estimated. The results of calculations are in a close agreement with the observational data. 相似文献
20.
Simulation of the Whole Process of Ship-Bridge Collision 总被引：6，自引：0，他引：6