最新刊期
期 28 ， 1987
- 摘要：With numerical model results on the tide and tidal current in the eastern China Seas the characteristics of tidal residual currents are discussed. It is showed that in most China mainland coastal areas such as those in Liaonan,the Shandong Peninsula, offshore northern Jiangsu, and the Bohai Sea, the directions of tidal residual currents are consistent with the coastal current system. So the tidal residual currents in these areas play important roles in coastal current transport.关键词：TIDAL RESIDUAL CURRENTS,THEIR RELATIONS WITH COASTAL CURRENT TRANSPORTS, BOHAI SEA,YELLOW SEA,EAST CHINA SEA
- 141
- |
- 93
- |
- 0
发布时间：2023-04-28 - 摘要：A major problem envisaged in the course of man-made climate change is sealevel rise. The global aspect of the thermal expansion of seawater is reasonably well simulated by present day climate models; the coastal aspects of sea level rise, comprise the regional response to regional atmospheric forcing and to the large-scale oceanic circulation, is not adequately simulated by a global climate model because of insufficient spacial resolution. A method to infer the coastal aspects of sea level change uses a statistical"downscaling"strategy: a linear statistical modeles built upon a multy-year data set of local sea level data and of large-scale oceanic and/or atmopheric data such as sea-surface temperature or sea- level air-pressure. We apply this idea to the sea level along the Japanese coast. The sea level is related to regional and North Pacific sea-surface temperature and sea-level air pressure. Two relevent processes are identified, One process is the local wind set-up of water due to regional low-frequency wind anomalies; the other is a planetary scale atmosphere-ocean interaction which takes place in the eastern North Pacific.关键词：COAST SEA LEVEL,LARGE-SCALE CLIMATE STATE,DOWNSCALING ERCISE
- 92
- |
- 69
- |
- 0
发布时间：2023-04-28 - 摘要：A numerical 2D model for tidal movement was used to study the effect of changes of the Huanghe River Estuary(HRE)on the tidal wave movement in its adjacent sea area. Historical data showed that in modern times the Huanghe River Delta (HRD) had silted up forward by 2530.4 k㎡ during 1855 to 1984. Due to the unceasing changes of the HRE in the past 100-odd years, it has been developing and changing. The behavior of the current field off the HRD has also been varying.The main features of the tidal wave movement variations in the Bohai Sea are as follows. (1) The regular diurnal tide region off the HRD was the biggest in 1855 but has been gradually decreasing and moving northeastward since then. (2) The amphidromic point locations of constituents M2 and S2 and their corresponding amplitudes off the Wuhaozhuang vary as the HRD develops, so that the distances between the coast and the amphidromic points become shorter and shorter and their amplitudes become bigger and bigger. (3) The high speed region off the HRD,where maximum tidal current speed can be greater than 120cm/s, varies with the development of the HRD. The extent and speed have been getting bigger and bigger gradually since 1855.关键词：HUANGHE RIVER ESTUARY,TIDAL WAVE MOVEMENT
- 84
- |
- 73
- |
- 0
发布时间：2023-04-28 - 摘要：To study the effect of tidal mixture on the formation of upwelling along the Fujian coast, The tide and tidal current in the Taiwan Strait were calculated with the method of ADI and splitting operator. The present results show that the M2 components of tidal wave entering the Strait from the south are stronger than those calculated previously and can influence the region adjoining Jinmen island.The section linked by two points, Weitou (24°40′N, 118°30′E) and Xianxi (24°11'N,120°25′E), can be considered as the middle line of demarcation of the Strait. In the south and north sides of the Strait. The M2 constituent features are determined mainly by the two M2 tidal waves entering the Strait from the south and north,respectively. The section linked by Weitou and Xianxi is the intersect of the two branches of the M2 tidal waves. Affected by sea bottom topography, coastal line and tidal wave propagation, there are three regions with high tidal current velocity and two regions with low tidal current velocity in the Taiwan Strait. Tidal current velocity is high in the vicinity of the Haitan, Nanri, Penghu islands and Taiwan shoal, and low at the south-east side of Taiwan and the middle Strait. Results obtained from the model show that maximum velocity of M2 tidal current is 2.0 m/s which appears in the offshore of Haitan island. Velocities in the low tidal current velocity region are generally about 0.1m/s-0.3m/s. Average values of amplitude and phase of K1 and O1 constituents representing amplitude and phase of M2 constituent were used to calculate M1 tide and M1 tidal current.关键词：UPWELLING,FUJIAN COAST,TAIWAN STRAIT,TIDE,TIDAL CURRENT
- 80
- |
- 71
- |
- 0
发布时间：2023-04-28 - 摘要：The tropical-cyclone-generated currents for the severest 41 events in the Gulf of Tonkin (Beibu Gulf) during 1949-1987 were numerically hindcasted by using Liu and Leendertse's (1978) finite-difference model. The hindcasted storm surges agreed satisfactorily with the observed values. To meet the need of engineering design an extreme value analysis was carried out to obtain extreme current speeds corresponding to various return periods. An analysis of the current field generated by the typhoon No.8303(Vera, 1983) is also reported in the present paper.关键词：BEIBU GULF,TYPHOON-GENERATED CURRENTS,THREE-DIMENSIONAL NUMERICAL HINDCASTS
- 80
- |
- 69
- |
- 0
发布时间：2023-04-28 - 摘要：Based on the hydrodynamics and chemical thermodynamics of acidic fogs,a two-dimensional physico-chemical numerical model of advection-radiation fog has been developed to investigate the formation and evolution of fog and the acidification process of fog water,and to estimate regional distribution of sulfur dioxide and PH of fog water in Qingdao in summer. Turbulence, advection, radiation, gravitational settling and SO2 (g) transformation are included in the model. The calculated results show good agreements with measured concentrations of fog and pH of fog water, and may be account for the presence of very acid fogs in Qingdao or along the Shandong coast and may be important for the understanding of acid rain.关键词：ACID FOG IN QINGDAO,NUMERICAL SIMULATION
- 91
- |
- 64
- |
- 0
发布时间：2023-04-28 -
CHANGES OF THE DILUTED WATER DISTRIBUTION CAUSED BY THE FLUVIAL PROCESS OF THE HUANGHE RIVER ESTUARY
摘要：The Huanghe River tail (HRT) has changed channels twice since 1964, Diaokouhe Channel (from Jan, 1964 to May, 1976) and the Qingshuigou Channel (from May, 1976 up to now). In the Diaokouhe Channel period, the river tail flowed roughly northward into the Bohaiwan Bay, but since May, 1976, has flowed into the Laizhouwan Bay from the Qingshuigou Channel. The major results of the analysis on the distributional features of the Huanghe River Diluted Water (HRDW) in both periods are presented in this paper as follows. (1) In the Huanghe River (HR) flood season the HRDW exists off the water-running mouth and is different from the Baonan coastal water. The core salinity of the HRDW is less than 27 and its thickness is not greater than 10m. The HRDW salinity at its outer boundary can reach 29.5, with corresponding thicknees not greater than 15m. (2)In the flood season,the behaviours of the HRDW are different not only in the different HRT periods but also in the different stages of the same HRT periods.(3) The extent and direction of the HRDW not only has monthly variations due to the HR’s mean runoff discharge but also reveals a weekly fluctuations owing to the intermittent runoff in the HRT. (4) During the period of the Qingshuigou Channel, generally speaking,the HRDW spreads northeastward in the flood season, but the spreading direction is significantly affected by flood_ebb process, which is to say that the flood tide cause the HRDW to spread to the southeast and the ebb tide to the northeast.关键词：DILUTED WATER DISTRIBUTION CAUSED,HUANGHE RIVER ESTUARY,FLUVIAL PROCESS,CHANGES- 78
- |
- 58
- |
- 0
发布时间：2023-04-28 - 摘要：Historical data show that each of the 10 great changes of the Huanghe River Estuary (HRE) that occurred since 1855 influenced greatly the current field in its adjacent shelf area. Taking the latest change as an example, this paper analyzes the basic behaviours of tidal and residual currents before and after the change. The main conclusions from this study are as follows.(1) The frequent changes of the HRE have changed the properties of tidal currents in some nearshore area off the Huanghe River Delta (HRD).For example, tidal currents in the offshore area betewwn the Shenxiangou Dtream Outlet (SSO)and the Diaokouhe Stream Outlet (DSO),used to be regularly semi-diurnal in 1958-1959 when the HRE was located around the SSO, became irregularly semi-diurnal in 1965 when the HRE was located around the DSO. (2) Although tidal currents in the most nearshore section off the HRD are approximately rectilinear, with the major axis of the current ellipse roughly parallel to the coast, the M2 constituent of tidal current on both sides of the waterrunning HRE is of rotary characteristic and varies with the change of the HRE.(3) There exist two characteristically high current speed regions off the HRD. One is associated with the amphidromic point of the M2 constituent off the SSO, the other with the water-running HRE, and varies with the change of the HRE. (4)The residual currents off the HRD are mainly wind-driven currents with significant seasonal variation. (5)There are many unstable meso-scale eddies off the waterrunning HRE, which cause local upwelling.关键词：HUANGHE RIVER ESTUARY,CURRENT FIELD,ITS ADJACENT SHELF AREA
- 73
- |
- 70
- |
- 0
发布时间：2023-04-28 - 摘要：A relative analysis of suspended matter concentration of sea surface water sampled in Aug. 1989 from the Huanghe River Estuary area and of Landsat Tape Data taken under the weather condition similar to those during the period of sampling was made.The best band (TM3) or bands (TM3 and TM4) for the study of suspended matter and a relative regression or divided regression formulae were obtained. A simple method eliminating the atmospheric disturbance was proposed after analyzing the optic features of Landsat tapes. The error and its cause in the quantitative model was discussed as well.关键词：LANDSAT TM TAPES,QUANTITATIVE,SUSPENDED MATTER DISTRIBUTION,HUANGHE RIVER ESTUARY AREA
- 82
- |
- 62
- |
- 0
发布时间：2023-04-28 - 摘要：In the last stage of Late Pleistocene, the sedimentary environment in the China continental shelf region was mainly cold and dry. The environment changes were due to monsoonal circulation brought about by the Mongolion High Pressure. Dunes and loess deposits and several sandy geomorphologic types comprised the sedimentary environment. The primary characteristics of sedimentation was desertization and occurrence of its derivative deposits. The main evidences of desertization deposits are: endless erosion surface, large range of mixed deposits, universal "angle of repose" texture, dune type deposits, long distance interface of the most intense desertization and slightly intense desertization.关键词：SHALLOW LAYER PROFILER,SHALLOW LAYER STRUCTURE,CONTINENTAL SHELVES OF THE BOHAI SEA AND YELLOW SEA
- 75
- |
- 76
- |
- 0
发布时间：2023-04-28 - 摘要：2-D nonsteady-state heat advective-conduction equations were used to simulate tectonically thermal evolution in this study on the effects of magmatic activity in the Okinawa Trough region. Showing that the effects of magmatic activity are important to and can explain the observed high surface heat flow there. A floe function used to describe the flow of mantle under Okinawa Trough showed the crustal thickness in the region is about 18km, the Trough expansion rate is 0.4cm/a, the surface descent rate is 0.05cm/a, and the thermal process of the trough is about 10 million years.关键词：Okinawa Trough region,THERMODYNAMIC MODELING
- 108
- |
- 110
- |
- 0
发布时间：2023-04-28 - 摘要：The influence of alloy elements on the corrosion resistance of 18 types of low alloy steels in atmospheric zone, splash zone and seawater of submerged zone was respectively investigated using electric connection technique. Based on the experimental results, regression equations were derived to describe their corrosion behaviours.The results showed that the corrosion resistance of low alloy steels could be greatly improved by adding some alloy elements, such as P, Cu and Mo for marine atmospheric zone and P, Mo and Cu for splash zone, and Al and Cr for seawater submerged zone.关键词：alloy elements,corrosion resistance ,low alloy steels
- 112
- |
- 61
- |
- 0
发布时间：2023-04-28 - 摘要：Three regression equations describing the effects of alloy elements on the corrosion resistance of low alloy steels for marine environment were derived using Householder Transform Method. F tests indicated the linear relationship between the corrosion rate of steels and the amount of alloy elements added. Experimental results showed the regression equations could be reliably applied for evaluating the corrosion behaviours of low alloy steels in marine environment.关键词：alloy elements,corrosion resistance ,low alloy steels
- 74
- |
- 56
- |
- 0
发布时间：2023-04-28 - 摘要：In this marine engineering geological investigation, 5 kinds of sea-bottom soils in the Liaodong Bay were studied using new angly techniques, a marine engineering geological examination vessel and our patented technology developed for testing “MD"corrosion test pipe in the seabottom soil. The corrosion rates of 3 kinds of steel are given, and the steel corrosion mechanism and its relation to environmental factors are discussed.关键词：sea-bottom soils in the Liaodong Bay,steel corrosion,“MD”
- 63
- |
- 66
- |
- 0
发布时间：2023-04-28 - 摘要：This paper summarizes the influence of toxicity of Cu2+, Zn2+, Cd2+ and Pb2+ on eggs hatching and survival of nauplius of Penaeus orientalis from the Haiyang Hatchery under different PH and salinity. The 50% egg hatchability concenttrations were 0.165mg/L for Zn2+, 0.072mg/L for Cd2+, 1.88mg/L for Pb2+ and 0.0065mg/L for Cu2+. The LC50 96h (Median Lethal Tolerance Limit) of the four heavy metal ions for nauplius of Penaeus orientalis tested 0.048mg/L for Zn2+, 0.033mg/L for Cd2+, 0.174mg/L for Pb2+ and 0.018mg/L for Cu2+. The results showed the toxic order of these metals to be Cu2+ > Cd2+ > Zn2+ > Pb2+ for the hatching of eggs and the survival of nauplius.关键词：larval of Penaeus orientalis,survival of nauplius,METAL IONS,TOXICITY
- 76
- |
- 63
- |
- 0
发布时间：2023-04-28 - 摘要：Gas chromatography method was used to determine the content of fatty acids in eight Sargassum species from Guangxi Beibu Bay for comparison with that of Laminaria japonica, Porphyra yezoensis Veda and Ulva pertusa Kjellm. The results were as follows: 1. The predominant saturated fatty acid in all Sargassum were palmitic acid (16: 0)whose content was about 33-50% of total fatty acids. 2. The composition of C18 polyunsaturated fatty acids (PUFA) in the Sargassum were more than that of Porphyra vezoensis. Main PUFA were Linoleic acid (18: 2ω6, LA) and Alpha-Linolenic acid (18: 3ω3, ALA) whose average content comprised 21-26% of total fatty acids. Eicosatetraenoic acid (Arachidonic acid, 20: 4ω6, AA) and Eicosapentaenoic acid (20: 5ω3, EPA) are useful for the human body and comprise 10% (average content)in Sargassum, 5.3-14.7% of them is AA, 1.14-3.78% is EPA.3. The content of PUFA in Sargassum was higher than that in Laminaria japonica and the some as that in Ulva pertusa Kjellm. In these seaweeds studied Porphyra vezoenosis has the highest PUFA content.关键词：Sargassum,Guangxi Beibu Bay,fatty acids
- 95
- |
- 66
- |
- 0
发布时间：2023-04-28 - 摘要：Field studies on primary production and new production in Jiaozhou Bay carried out seasonally from Nov. 1991 to May 1993 showed that primary production was higher in spring and summer(434-1271mgC?m-3?d-1), and lower in autumn and winter. New production followed the similar pattern, but had more fluctuations.Compared with other coastal regions, primary production in Jiaozhou Bay was at the middle level, and new production was at a very low level. The f-ratio ranged from 0.05 to 0.14. The low level of the f-ratio was mainly due to the relatively low supply of NO-3-N throughout the year. The f-ratio given by the traditional definition might be an under-estimate for the nearshore waters like those of Jiaozhou Bay since a certain amount of NH+4-N comes from other sources outside the system. Horizontal distributions of primary production and new production in Jiaozhou Bay are shown in this paper. Some environmental factors associated with production level are also discussed.关键词：Jiaozhou Bay,PRIMARY PRODUCTION , NEW PRODUCTION
- 70
- |
- 69
- |
- 0
发布时间：2023-04-28 - 摘要：Results of analysis of trawlnet data from 1956 to 1989, from marine fishing companies for studies on the characteristics and successions of structure and proper utilization of fishery resources in the China Sea are presented in this paper. There are abundant fisheries resources, varied species and complex district composition in the China Seas. Among the 39 species of main coastal fishery resources,warm-water element accounts for 69.2%,The second is warm-temperature element, accounts for 23.1% and 9 species. Cold-temperature element has the least species, only 3 and their proportion is 7.7%. In the China Seas, resources of single species are not abundant, the distribution of major dominant species has regional property, so they are relatively independent,but utilization of them is inrarional.Most benthic species are over exploited, except for some shrumps, crabs, pelagic fishes and cephalopods still have certain potentiality. In the past 40 years, the dominant species of fishery resources are replaced frequently, changes of their structure are manifest. The trend of successions was as follows:with the passage of time,the proportion of bottomfish resources declined yearly; on the contrary, shrumps, crabs and pelagic fishes, increased day by day and became smaller, younger and inferior.关键词：China Seas,CHARACTERISTICS AND SUCCESSIONS OF STRUCTURE OF FISHERY RESOURCES
- 95
- |
- 75
- |
- 0
发布时间：2023-04-28 - 摘要：Ruditapes philippinarum distributed in the coast of the Bohai Sea, Yellow Sea, East China Sea. and South China Sea lives in the inter-tidal zone of shallow water about 10m in depth where salinity is usually 30.8-32.0, and temperature, 2℃-27℃. It is most densely distributed in the Liaoning and Shandong coasts where it is usually found living in silty-sand(?0.004-0.063mm) bottom. It reproduces in spring and autumn in the Bohai Sea and Yellow Sea, but in the East China Sea and South China Sea, only in autumn. The< 1 year age group is composed mostly of individuals having shell length of 3.5-7.5mm, and the 4-year age group, ahell length of 17.4-21.6mm,24.5-33.7mm,33-43.8mm,and36-49.6mm.关键词：Ruditapes philippinarum,China seas
- 64
- |
- 66
- |
- 0
发布时间：2023-04-28 - 摘要：Naturally fertilized eggs collected from the Bohai Sea and the Yellow Sea and areificially fertilized eggs were observed under TEM, 12 species were selected from the samples for comparative study of their chorion structure. The difference of chorion thickness and division of chorion layers show the species specific difference of fish eggs.关键词：MARINE FISHES, ULTRASTRUCTURE OF THE CHORION
- 133
- |
- 79
- |
- 0
发布时间：2023-04-28 - 摘要：This paper reports morphological study on Ditylum sol by light (LM) and scanning electron microscopes (SEM). The cell of D. sol is prism shaped.LM showed the valve of D. sol is triangled and with fine puntae in radial rows. The middle part of the valve margin is concave. A strongly hollow spine appears at the valve center. SEM showed radially arranged rota (elongated, 0.8-5μm in length), and scattered open-pores on the valve face and a labiate process at the inside of the valve.On the valve mantle are some small rotas (04-0.8μm in length) arranged in parallel. Numerous small pores distribute on the connecting band of this species. Some diatomists stated that the valve of the species of genus Ditylum (including D. so1) is composed of interior and outer triangled, portion as they mistook the valve mantle for the outer triangle.关键词：Ditylum sol
- 97
- |
- 70
- |
- 0
发布时间：2023-04-28 - 摘要：During work on the Anthopleura fauna of China,many specimens differing from the recorded species of the genus were found recognized as comprising a new species. The type specimens are deposited in the Insititute of Oceanology, Chinese Academy of Sciences, Qingdao, China.关键词：Anthopleura qingdaoensis
- 81
- |
- 63
- |
- 0
发布时间：2023-04-28 - 摘要：This paper presents a new genus and species of the family Treptodemidae collected from Hainan Province. All the measurements are in mm.(ova in μm. ) The type specimens are deposited in the Institute of Oceanology, Academia Sinica, Qingdao.关键词：NEW GENUS AND SPECIES,TREPTODEMIDAE (Trematoda: Digenea)
- 113
- |
- 81
- |
- 0
发布时间：2023-04-28 - 摘要：Cephalaspidea is one of the primitive group of Opisthobranchia, Gastropoda,Mollusca and is particularly common in tropical and subtropical waters of the Indo-Pacifio region. The Cephalaspidea fauna of China is mainly composed of tropical and subtropical species, and also a lot of temperate species, but no cold water and circumtropical species have been found. It is closely related to that of Southern Japan fauna. Among the 145 species and subspecies of Cephalaspidea found in the China Sea.45 species are found in the Bohai Sea-Yellow Sea, which mainly of temperate species; 66 species mainly composed of warm species and a lot of temperate species are found in the East hina Sea; 104 species occurring in the South China Sea are composed of tropical and subtropical species, the temperate species reduced.关键词：CEPHALASPIDEA (OPISTHOBRANCHIA )FAUNA,CHINA SEA
- 157
- |
- 84
- |
- 0
发布时间：2023-04-28
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0