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The statistical prediction of beach changes in southern California
OLR(1980)27(12)
C. Submarine Geology and Geophysics
Analysis of the heavy and light mineral fractions of 212 sediment samples, collected from the Gulf of Bohai Sea and its tributaries, revealed 43 mineral components. The area was divided into two mineral provinces and nine subprovinces that could be related to source area, based on mineral assemblages. Institute of Oceanology, Academia Sinica, People's Republic of China. (kink) 80:5908 Krissek, L. A., K. F. Scheidegger and L. D. Kulm, 1980. Surface sediments of the Peru-Chile continental m a r g i n and the Nazca Plate. Bull. geol. Soc. Am., 91(6)(I): 321-331. Bulk chemistry and textural analyses were performed on 88 sediment samples to elucidate factors and processes controlling fine-grained, terrigenous deposition on the Peru-Chile continental margin and the Nazca Plate. Biogenous, terrigenous, upwelling-influenced, and authigenic sediment provinces were defined. South of 7°S, the 'PeruChile Trench may not act as a physical barrier' to s e a w a r d s e d i m e n t t r a n s p o r t . School of Oceanography, Oregon State University, Corvallis, Oreg. 97331, U.S.A. (izs) 80:5909 McLennan, S. M. and S. R. Taylor, 1980. Th and U in sedimentary rocks: crustal evolution and Aedimentary recycling. Nature, Lond., 285(5787): 621-624. Th and U abundances in sediments increase at the Archean-Proterozoic boundary, in response to an episodic change in the composition of the upper continental crust. U decreases and T h / U increases during post-Archean time due to significant recycling of sedimentary rocks. Research School of Earth Sciences, Australian National University, Canberra, ACT 2600, Australia.
867
80:5911 Vora, K. H., A. R. Gujar and S. M. Karisiddaiah, 1980. Sandwaves of the Gulf of Khambhat [western India]. Indian J. mar. Sci., 9(2): 9093.
Studies of sandwaves in the Gulf of Khambhat suggest formation under high-energy hydrodynamic conditions associated with the large tidal range. The sandwaves, with the finer sediments concentrated at the crests, are derived from the coarse sediments supplied by the Narmada and Tapti rivers.Present-day bedforms are studied to improve knowledge of relictsedimentary structures. National Institute of Oceanography, Dona Paula, Goa 403 004, India. (kink)
10. Coasts, beaches and marshes 80:5912 Aubrey, D. G., D. L. Inman and C. D. Winant, 1980. The statistical prediction of beach changes in southern California. J. geophys. Res., 85(C6): 3264-3276. Investigators were able to significantly predict daily and weekly sandy beach profile changes using hindcasting and forecasting modes of linear statistical estimation. Beach profiles and wave statistics for the southern California beach were collected over a five-year period and analyzed with the assumption that major changes in beach configuration were due to onshore/offshore sand transport. The estimation methods should be useful at all sandy beaches ff longshore transport effects are also considered. Woods Hole Oceanographic Institution,Department of Geology and Geophysics, Woods Hole, Mass. 02543, U.S.A. (bas)
80:5910 Thibault, J., 1978. Physical p a r a m e t e r distribution patterns in bottom sediments of the Buctouche Bay complex [New Brunswick]. Marit. Sed., 14(3): 95-102.
80:5913 Luepke, Gretchen, 1980. Opaque minerals as aids in distinguishing between source and sorting effects on beach-sand mineralogy in southwestern Oregon. J. sedim. Petrology, 50(2): 489-495.
The areal variability and composite origin of bottom sediments are studied in Buctouche Bay, a drowned estuary, and coastal lagoon. The enclosed nature of the bay results in a low-energy environment, except at the tidal entrance, which affects sediment distribution. Fine-grained sediments from fluvial discharge predominate in the deep part of the bay, and sandy littoral sediments dominate near the tidal entrance. Department of Geology, University of New Brunswick, Fredericton, New Brunswick, Canada. (kink)
Opaque, magnetic minerals are important constituents of the black sands sampled from four southwestern Oregon beaches. Because they are similar in size, shape and specific gravity, they tend to be 'source-sensitive, but sortinginsensitive.' The T i / C r range proved fairly distinct for each of the beaches sampled, and it is inferred that relatively littletransport took place around the headlands which isolated them from one another. The technique described is thought to be generally applicable to distinguishing between the
C. Submarine Geology and Geophysics
Analysis of the heavy and light mineral fractions of 212 sediment samples, collected from the Gulf of Bohai Sea and its tributaries, revealed 43 mineral components. The area was divided into two mineral provinces and nine subprovinces that could be related to source area, based on mineral assemblages. Institute of Oceanology, Academia Sinica, People's Republic of China. (kink) 80:5908 Krissek, L. A., K. F. Scheidegger and L. D. Kulm, 1980. Surface sediments of the Peru-Chile continental m a r g i n and the Nazca Plate. Bull. geol. Soc. Am., 91(6)(I): 321-331. Bulk chemistry and textural analyses were performed on 88 sediment samples to elucidate factors and processes controlling fine-grained, terrigenous deposition on the Peru-Chile continental margin and the Nazca Plate. Biogenous, terrigenous, upwelling-influenced, and authigenic sediment provinces were defined. South of 7°S, the 'PeruChile Trench may not act as a physical barrier' to s e a w a r d s e d i m e n t t r a n s p o r t . School of Oceanography, Oregon State University, Corvallis, Oreg. 97331, U.S.A. (izs) 80:5909 McLennan, S. M. and S. R. Taylor, 1980. Th and U in sedimentary rocks: crustal evolution and Aedimentary recycling. Nature, Lond., 285(5787): 621-624. Th and U abundances in sediments increase at the Archean-Proterozoic boundary, in response to an episodic change in the composition of the upper continental crust. U decreases and T h / U increases during post-Archean time due to significant recycling of sedimentary rocks. Research School of Earth Sciences, Australian National University, Canberra, ACT 2600, Australia.
867
80:5911 Vora, K. H., A. R. Gujar and S. M. Karisiddaiah, 1980. Sandwaves of the Gulf of Khambhat [western India]. Indian J. mar. Sci., 9(2): 9093.
Studies of sandwaves in the Gulf of Khambhat suggest formation under high-energy hydrodynamic conditions associated with the large tidal range. The sandwaves, with the finer sediments concentrated at the crests, are derived from the coarse sediments supplied by the Narmada and Tapti rivers.Present-day bedforms are studied to improve knowledge of relictsedimentary structures. National Institute of Oceanography, Dona Paula, Goa 403 004, India. (kink)
10. Coasts, beaches and marshes 80:5912 Aubrey, D. G., D. L. Inman and C. D. Winant, 1980. The statistical prediction of beach changes in southern California. J. geophys. Res., 85(C6): 3264-3276. Investigators were able to significantly predict daily and weekly sandy beach profile changes using hindcasting and forecasting modes of linear statistical estimation. Beach profiles and wave statistics for the southern California beach were collected over a five-year period and analyzed with the assumption that major changes in beach configuration were due to onshore/offshore sand transport. The estimation methods should be useful at all sandy beaches ff longshore transport effects are also considered. Woods Hole Oceanographic Institution,Department of Geology and Geophysics, Woods Hole, Mass. 02543, U.S.A. (bas)
80:5910 Thibault, J., 1978. Physical p a r a m e t e r distribution patterns in bottom sediments of the Buctouche Bay complex [New Brunswick]. Marit. Sed., 14(3): 95-102.
80:5913 Luepke, Gretchen, 1980. Opaque minerals as aids in distinguishing between source and sorting effects on beach-sand mineralogy in southwestern Oregon. J. sedim. Petrology, 50(2): 489-495.
The areal variability and composite origin of bottom sediments are studied in Buctouche Bay, a drowned estuary, and coastal lagoon. The enclosed nature of the bay results in a low-energy environment, except at the tidal entrance, which affects sediment distribution. Fine-grained sediments from fluvial discharge predominate in the deep part of the bay, and sandy littoral sediments dominate near the tidal entrance. Department of Geology, University of New Brunswick, Fredericton, New Brunswick, Canada. (kink)
Opaque, magnetic minerals are important constituents of the black sands sampled from four southwestern Oregon beaches. Because they are similar in size, shape and specific gravity, they tend to be 'source-sensitive, but sortinginsensitive.' The T i / C r range proved fairly distinct for each of the beaches sampled, and it is inferred that relatively littletransport took place around the headlands which isolated them from one another. The technique described is thought to be generally applicable to distinguishing between the