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A preliminary investigation of the recent sediments off the east coast of Australia
112
Oceanographic Abstracts
The material suspended in oceanic waters is usually more fine-grained as compared with HK sediments. In the quiet regions of the ocean granulometric profiles of the suspensions arc similar to tho:.c of the sediments. In places where a sorting of sediment material by currents and waves takes place granulometric contents of suspension greatly differ from sediments. The study of quantitative vertk~al distribution of suspension in vast oceanic regions and of its granulometric contents is used as a basis for an attempt to determine the rate o f subsidence of suspension, e.g. the rate of modern sedimcw tation. In the investigated region of the Indian Ocean this rate proved to be equal to 13 cm per 1000 years. As regards radium and ionium, tbe rate of sedimentation proved to be slightly le.~s than 1 cm per 1000 years. LOUGHNAN F, C. and D. C. CRAIG, 1962. A preliminary investigation of the recem sedimer'as oii the east coast of Australia. Austral. Z Mar. and Freshwater Res., 13 (1): 48 56. Recent sediments from the continental shelf and inner margin of the continental slope for a secliou of the east Australian coast extending from Sydney to Moreton Island have been examined xx.ith respect to composition and particle size distribution. Although insufficient samples are available for conclusive evidence it would appear that there has been very little longshore movement of material and the bulk of the detritus in each sector has been derived from the immediately adjacent land area~ In the Sydney sector there is a suggested variation in clay mineral content with depth which tends to support the differential settling concept. Glauconite, in association with clay pellets, foraminifcrat tests, and fine quartz, occurs in goethite and siderite cemented nodules on the continental slope olT Port Macquarie and ColT's Harbour. LUKYANOV V. V. and L. K. MOlSEY~V, 1961. Distribution of water temperatures in the norihcr~ Indian Ocean. (In Russian; English abstract). Okeanolo~,. lssle~L, Mezhd. Kornitet P~'ot~ed..5~,~'zh~/. Geofiz. Goda, PrezMiume, Akad. Nauk, SSSR, (4): 31-43. The paper gives a preliminary report summarising the data of water temperature on 200 hydrologica~ stations obtained during the 31st cruise of the R/V ViO,az. The works of Vityaz coincided with the period of a set in winter monsoon. This circumstance made it possible for the authors to considci the temperature conditions of the investigated region within the limits of one season. On the basis of the analysis of the maps and of the profiles of temperature distribution :re n~w: come to the following conclusions : 1. Water temperature of the given region is closely connected with the peculiarities of geographicu~ location, namely, with the limitation of African-Asian continental barrier and wilh the close contac! with the vast arid regions of the North-West. 2. The northern part of the ocean is almost completely under the influence of mo,soons, detc~ mining to a considerable degree the main features of the temperature water regime. 3. The applied maps quite evidently testify to the fact that currents play an active role in ~i~v distribution of temperature. 4. Alongside with the advection of the heat by currents, by processes of turbulent and convective exchange the submarine relief has essential significance in horizontal and vertical redistribution ,.H" heat (stable cold spot within the limits of Indian-Australian hollow). LUKYANOVV. V., N. P. NEFEDYEVand Yu. A. ROMANOV,1962. On the scheme of surface current:, in the Indian Ocean during the winter monsoon. Mezhd. Geofiz. Komitet, Prezidiume Akad. ~.'atd,:, SSSR, Rezult. Issled. Programme Mezhd. Geofiz. Goda, Okeanol. IsslecL, 5:19--24 Data on wind deviations in November, December 1959 and in January, February 1960, from tilL' mean one for many years is used to make the scheme of the surface currents of the Indian ()cea~ more exact. The said scheme has been based on the data of observations carried out duri~g t}c 31st cruise of the R/V ViO,az. MACK L. R., 1962. Periodic, tinite-amplitude, axisymmetric gravity waves. J. ~;eophtv. R ~ 67 (2) : 829-844. A study is made of finite-amplitude axisymmetric gravity waves in a circular basin of unitbrm d e p t h Periodic, free, first-mode oscillations ofa nonviscous incompressible liquid are considered. Through the use of Dini expansions, the exact nonlinear governing equations are solved by an iterative procedure which has been carried through the third approximation. The effects of finite amplitude on the surface profile and on the frequency of oscillation are investigated, and the amplitude and angle at the crest of a maximum wave are studied. It is noted that at certain ' critical ' depth-radius ratios the first-mode oscillation may be coupled with a higher-mode motion at an integral multiple of tt~e basic frequency. MACKIN J. G. and S. H. HOeKtNS, 1961. Studies on oysters in relation to the oil irdustry. Ptd;.:
Inst. Mar. Sci., 7 : 1-314. Field and laboratory studies and examination of historical records were made in the tidal waters ot Louisiana to determine the possible role of operations of oil companies on mortality of commercial oysters, Crassostrea virginica. Periods of disastrously high mortality were found in past records, both before and after the beginning of oil operations in the area. According to official figures, 1940
Oceanographic Abstracts
The material suspended in oceanic waters is usually more fine-grained as compared with HK sediments. In the quiet regions of the ocean granulometric profiles of the suspensions arc similar to tho:.c of the sediments. In places where a sorting of sediment material by currents and waves takes place granulometric contents of suspension greatly differ from sediments. The study of quantitative vertk~al distribution of suspension in vast oceanic regions and of its granulometric contents is used as a basis for an attempt to determine the rate o f subsidence of suspension, e.g. the rate of modern sedimcw tation. In the investigated region of the Indian Ocean this rate proved to be equal to 13 cm per 1000 years. As regards radium and ionium, tbe rate of sedimentation proved to be slightly le.~s than 1 cm per 1000 years. LOUGHNAN F, C. and D. C. CRAIG, 1962. A preliminary investigation of the recem sedimer'as oii the east coast of Australia. Austral. Z Mar. and Freshwater Res., 13 (1): 48 56. Recent sediments from the continental shelf and inner margin of the continental slope for a secliou of the east Australian coast extending from Sydney to Moreton Island have been examined xx.ith respect to composition and particle size distribution. Although insufficient samples are available for conclusive evidence it would appear that there has been very little longshore movement of material and the bulk of the detritus in each sector has been derived from the immediately adjacent land area~ In the Sydney sector there is a suggested variation in clay mineral content with depth which tends to support the differential settling concept. Glauconite, in association with clay pellets, foraminifcrat tests, and fine quartz, occurs in goethite and siderite cemented nodules on the continental slope olT Port Macquarie and ColT's Harbour. LUKYANOV V. V. and L. K. MOlSEY~V, 1961. Distribution of water temperatures in the norihcr~ Indian Ocean. (In Russian; English abstract). Okeanolo~,. lssle~L, Mezhd. Kornitet P~'ot~ed..5~,~'zh~/. Geofiz. Goda, PrezMiume, Akad. Nauk, SSSR, (4): 31-43. The paper gives a preliminary report summarising the data of water temperature on 200 hydrologica~ stations obtained during the 31st cruise of the R/V ViO,az. The works of Vityaz coincided with the period of a set in winter monsoon. This circumstance made it possible for the authors to considci the temperature conditions of the investigated region within the limits of one season. On the basis of the analysis of the maps and of the profiles of temperature distribution :re n~w: come to the following conclusions : 1. Water temperature of the given region is closely connected with the peculiarities of geographicu~ location, namely, with the limitation of African-Asian continental barrier and wilh the close contac! with the vast arid regions of the North-West. 2. The northern part of the ocean is almost completely under the influence of mo,soons, detc~ mining to a considerable degree the main features of the temperature water regime. 3. The applied maps quite evidently testify to the fact that currents play an active role in ~i~v distribution of temperature. 4. Alongside with the advection of the heat by currents, by processes of turbulent and convective exchange the submarine relief has essential significance in horizontal and vertical redistribution ,.H" heat (stable cold spot within the limits of Indian-Australian hollow). LUKYANOVV. V., N. P. NEFEDYEVand Yu. A. ROMANOV,1962. On the scheme of surface current:, in the Indian Ocean during the winter monsoon. Mezhd. Geofiz. Komitet, Prezidiume Akad. ~.'atd,:, SSSR, Rezult. Issled. Programme Mezhd. Geofiz. Goda, Okeanol. IsslecL, 5:19--24 Data on wind deviations in November, December 1959 and in January, February 1960, from tilL' mean one for many years is used to make the scheme of the surface currents of the Indian ()cea~ more exact. The said scheme has been based on the data of observations carried out duri~g t}c 31st cruise of the R/V ViO,az. MACK L. R., 1962. Periodic, tinite-amplitude, axisymmetric gravity waves. J. ~;eophtv. R ~ 67 (2) : 829-844. A study is made of finite-amplitude axisymmetric gravity waves in a circular basin of unitbrm d e p t h Periodic, free, first-mode oscillations ofa nonviscous incompressible liquid are considered. Through the use of Dini expansions, the exact nonlinear governing equations are solved by an iterative procedure which has been carried through the third approximation. The effects of finite amplitude on the surface profile and on the frequency of oscillation are investigated, and the amplitude and angle at the crest of a maximum wave are studied. It is noted that at certain ' critical ' depth-radius ratios the first-mode oscillation may be coupled with a higher-mode motion at an integral multiple of tt~e basic frequency. MACKIN J. G. and S. H. HOeKtNS, 1961. Studies on oysters in relation to the oil irdustry. Ptd;.:
Inst. Mar. Sci., 7 : 1-314. Field and laboratory studies and examination of historical records were made in the tidal waters ot Louisiana to determine the possible role of operations of oil companies on mortality of commercial oysters, Crassostrea virginica. Periods of disastrously high mortality were found in past records, both before and after the beginning of oil operations in the area. According to official figures, 1940