Effect of Pollutants on the Physical and Engineering Behavior of Lime-Treated Marine Clay     

G. Rajasekaran  S. Narasimha Rao 《Marine Georesources & Geotechnology》2001,19(1):17-35

Rapid industrial growth and increasing population has resulted in the discharge of wastes into the ocean, wastes which ultimately reach the seabed and contaminate the marine sediments. The soil-contaminants interaction, and their associated physico chemical properties with sediments control the behavior of marine clays. Marine clay deposits of low strength and high compressibility are located in many coastal and offshore areas. There are several foundation problems encountered in these weak marine clays. In this study, experimental work was carried out in the laboratory to stabilize soft marine clays using the lime column technique. Also the lime-induced effects on the physical and engineering behavior of marine clays in sulfate-contaminated marine environment was investigated. Consolidation tests indicate that compressibility of the lime-treated samples was reduced to 1/2-1/3 of the virgin soil after 45 days treatment. The test results also suggest that the lime column technique can be conveniently used to improve the behavior of contaminated marine clay deposits.  相似文献   

Interspecies differences in heavy metal detoxication in oysters     

S.G. George  B.J. Pirie  J.M. Frazier  J.D. Thomson 《Marine environmental research》1984,14(1-4)

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In situ velocity profiles in gassy sediments: Kiel Bay     

S. S. Fu  R. H. Wilkens  L. N. Frazer 《Geo-Marine Letters》1996,16(3):249-253

Acoustic behavior of gas-bearing sediments is significantly different from that of gas-free sediments. In situ velocity profiles and acoustic signal characteristics in gas-bearing sediments of the upper several meters of the sea floor in Kiel Bay are presented in this study. Observed velocities in gas-bearing sediments are both higher and lower than those of the gas-free sediments. Small amounts of gas appear to cause signal reverberation without much attenuation. whereas large amounts of gas cause substantial attenuation.  相似文献   

Seasonal variation of global surface pressure and water vapor   总被引：1，自引：0，他引：1  

TSING-CHANG CHEN  JAU-MING CHEN  SIEGFRIED SCHUBERT  LAWRENCE L. TAKACS 《地球，A辑:动力气象学与海洋学》1997,49(5):613-621

Previous studies have shown that the seasonal variation of global-mean surface pressure ( p _s) results from variation of global-mean water vapor pressure ( p _w). The current study, employing the global data generated by Version 1 of the Goddard Earth Observing System (GEOS-1) Data Assimilation System, shows that seasonal variations of regional p _s and p _w tend to be out of phase (particularly in the subtropics of the two hemispheres) and that the magnitude of the former variation is generally much larger than that of the latter. The seasonal variations of these two quantities are maintained by airmass and water vapor transports by the global divergent circulation, which is driven by the latent heat released by cumulus convection over the water vapor sink, as the "water mass forcing" mechanism predicted. Since p _w and p _s are used often in depicting the climate system, assessments of climate change in terms of the global-mean and regional variations of these two variables should be interpreted with caution.  相似文献   

The Shandong mud wedge and post-glacial sediment accumulation in the Yellow Sea   总被引：14，自引：0，他引：14  

J. P. Liu  J. D. Milliman  S. Gao 《Geo-Marine Letters》2002,21(4):253-254

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Guest Editorial for the Special Issue on Tsunamis (Part II)     

T. S. Murty 《Marine Geodesy》2006,29(4):233-234

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Numerical experiments on the four-dimensional assimilation of the observation data derived in the Black Sea in June 1984 on the basis of a numerical energy-balanced model     

S. G. Demyshev  G. K. Korotaev 《Physical Oceanography》1993,4(3):193-205

A procedure for the four-dimensional (4D) analysis of the hydrophysical fields in the Black Sea with an assimilation of the temperature and salinity (T, S) data was realized on the basis of a numerical model which involves the primitive equations of motion, and the heat and salt advection equations. Two experiments were carried out which differed by the observation data assimilation procedure. Analysis has shown that the observation data assimilation procedure realized using the energy-balanced model allows the reproduction of some synoptic features of the circulation in the Black Sea. A comparison of two computations demonstrates the efficiency of assimilating the measurement data on the basis of the 4D analysis as compared with the sequential objective analysis.Translated by Mikhail M. Trufanov.  相似文献   

Serum biochemical and cellular responses to experimental cupric ion challenge in mussels     

G.V. Pickwell  S.A. Steinert 《Marine environmental research》1984,14(1-4)

Our intent has been to develop rapid and sensitive bioassay procedures for laboratory and field applications based on hemolymph factors in animals such as the bay mussel, Mytilus edulis. We found that mussel hemolymph could be easily and repeatedly sampled from individual animals in sufficient amounts to allow analyses for lysozyme, proteolytic activity, total protein and hemocyte counts. In static tests there seemed to be graded responses indicating release of increasing amounts of the above factors into the hemolymph in roughly direct proportion to Cu²⁺ concentration at lethal and sublethal levels. We interpreted this to be evidence for increased lysosomal and cellular disruption as cupric ion exposure was increased or prolonged. At the same time, Cu²⁺ concentrations in the mussel hemolymph increased up to an order of magnitude above ambient in the range of 26 to 267 ppb. We felt that this was evidence for the release of Cu-binding proteins into the mussel hemolymph. Simultaneously with the above events the serum granulocytes increased in numbers above control values by factors of 3 or 4 in response to copper challenge while macrophage (terminology of Moore & Lowe, 1977) counts, including controls, declined precipitously.  相似文献   

On the 75th anniversary of the Department of Atmospheric Physics of St. Petersburg State University     

G. S. Golitsyn  Yu. M. Timofeev 《Izvestiya Atmospheric and Oceanic Physics》2007,43(4):397-398

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Numerical Simulation of Vertical Motions in the Black Sea for the Case of Constant Density     

Demyshev  S. G. 《Physical Oceanography》2003,13(1):53-61

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