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18.—Sedimentation in some Scottish Rivers of Low Sinuosity*

Published online by Cambridge University Press:  06 July 2012

B. J. Bluck
B. J. Bluck
Affiliation:
Department of Geology, University of Glasgow.
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Synopsis

Scottish streams of low sinuosity have four kinds of bars, three are bank-attached (lateral), and one is medial. Bar type is related to sinuosity, and as streams often increase in sinuosity away from source, there tends to be a variation in bar type successively downstream. The morphology and structure of the bars are related to grain size—gravel bars do not have the same bed forms and structures as those made of sand—and variations in flow stage. The bar head, composed mostly of gravel, forms during the high-flow stage, and as the flow falls so sediments of the lee face record the changing flow pattern. With further drop in water level the locus of sedimentation shifts to the bar tail where the dwindling flow may build diversely oriented bed forms and structures. Changes in the rate of fall, or differences in the maximum rise of water level, result in different proportions of sediment type being deposited.

The mean orientation of the directional structures is not always alined with the mean stream direction, and the diversity of orientation is comparable with the diversity in orientation of directional structures in meandering streams. The variability in orientation is due to the effects of flood-produced bed forms in diverting the low-stage flow, stream sinuosity, and the changing orientation of the channel as it sweeps across the floodplain.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 69 , Issue 18 , 1976 , pp. 425 - 456
Copyright
Copyright © Royal Society of Edinburgh 1976

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References

References to Literature

Allen, J. R. L., 1967. Notes on some fundamentals of palaeocurrent analysis, with reference to preservation potential and sources of variance. Sedimentol., 9, 75–88.CrossRefGoogle Scholar
Bluck, B. J., 1971. Sedimentation in the meandering River Endrick. Scott. J. Geol., 7, 93–138.CrossRefGoogle Scholar
Bluck, B. J., 1974. Structure and directional properties of some valley sandur deposits in southern Iceland. Sedimentol., 21, 533–554.CrossRefGoogle Scholar
Boersma, J. R., 1967. Remarkable types of mega cross-stratification in the fluviatile sequence of a subrecent distributory of the Rhine. Amerongen; The Netherlands. Geologic Mijnb., 46, 217–235.Google Scholar
Born, S. M. and Ritter, D. F., 1970. Modern terrace development near Pyramid Lake, Nevada, and its geologic implication. Bull. Geol. Soc. Am., 81, 1233–1242.CrossRefGoogle Scholar
Brinkman, R., 1933. Uber Kreuzschichtung im deutschen Buntsandsteinbecken. Nachr. Ges. Wiss. Gottingen, 4 (32), 1–12.Google Scholar
Chien, N., 1961. The braided stream of the Lower Yellow River. Scientia Sin., 10, 734–754.Google Scholar
Coleman, J. M., 1969. Brahmaputra River: channel processes and sedimentation. Sediment. Geol., 3, 129–239.CrossRefGoogle Scholar
Collinson, J. D., 1970. Bed forms of the Tana River, Norway. Geogr. Annlr, A, 52, 31–56.CrossRefGoogle Scholar
Collinson, J. D., 1971. Current vector dispersion in a river of fluctuating discharge. Geologie Mijnb., 50, 671–678.Google Scholar
Conybeare, C. B. E. and Crook, K. A. W., 1968. Manual of sedimentary structures. Bull. Bur. Miner. Resour. Geol., Geophys. Aust., 102.Google Scholar
Church, M., 1972. Baffin Island sandurs: a study of Arctic fluvial processes. Bull. Geol. Surv. Can., 216.Google Scholar
Douglas, D. J., 1962. The structure of sedimentary deposits of braided rivers. Sedimentol., 1, 167–190.CrossRefGoogle Scholar
Fenneman, N. M., 1906. Floodplains produced without floods. Bull. Amer. Geogr. Soc. N.Y., 38, 89–91.Google Scholar
Glen, L. C., 1925. Geology and physiography of Red River boundary between Texas and Oklahoma. Pan-Am. Geol., 43, 365.Google Scholar
Harms, J. C., Mckenzie, D. B. and McCubbin, D. G., 1963. Stratification in modern sands of the Red River. J. Geol., 71, 566–580.CrossRefGoogle Scholar
Harms, J. C. and Fahnestock, R. K., 1965. Stratification, bedforms and flow phenomena. In Middleton, C. V. (ed.) Primary sedimentary structures and their hydrodynamic significance. Spec. Publs Soc. Econ. Palaeont. Miner., Tulsa, 12, 84–115.Google Scholar
Holmes, A., 1965. Principles of Physical Geology. London: Nelson.Google Scholar
Karcz, I., 1967. Harrow marks, current aligned sedimentary structures. J. Geol., 75, 113–121.CrossRefGoogle Scholar
Krigstrom, A., 1962. Geomorphological studies of sandur plains and their braided rivers in Iceland. Geogr. Annlr, 44, 328–436.Google Scholar
Leopold, L. B. and Wolman, M. G., 1957. River channel patterns: braided meandering and straight. Prof. Pap. U. S. Geol. Surv., 282A.Google Scholar
Leopold, L. B., Wolman, M. G. and Miller, J. P., 1964. Fluvial Processes in Geomorphology. San Francisco: Freeman.Google Scholar
Mackin, J. H., 1956. Causes of braiding by a graded river. Bull. Geol. Soc. Am., 67, 1717–1718.Google Scholar
McDonald, B. C. and Banerjee, I., 1971. Sediments and bed forms on a braided outwashplain. Can. J. Earth Sci 8, 1282–1301.CrossRefGoogle Scholar
Mcgowen, J. H. and Garner, L. E., 1970. Physiographic features and stratification types of coarse grained point bars; modern and ancient examples. Sedimentol., 14, 77–111.CrossRefGoogle Scholar
Ore, H. T., 1964. Some criteria for recognition of braided stream deposits. Contr. Geol., 3, 1–14.Google Scholar
Rust, B. R., 1972. Structure and process in a braided river. Sedimentol., 18, 221–245.CrossRefGoogle Scholar
Schumm, S. A., 1960. The effect of sediment type on the shape and stratification of some modern fluvial deposits. Am. J. Sci., 258, 177–184.CrossRefGoogle Scholar
Schumm, S. A., 1963. Sinuosity of alluvial rivers on the Great Plains. Bull. Geol. Soc. Am., 74, 1089–1100.CrossRefGoogle Scholar
Schumm, S. A. and Lichty, R. W., 1963. Channel widening along the Cimarron River in Southwestern Kansas. Prof. Pap. U.S. Geol. Surv., 352–D.Google Scholar
Scott, K. M. and Gravlee, G. C., 1968. Flood surge on the Rubicon River, California—hydrology, hydraulics and boulder transport. Prof. Pap. U.S. Geol. Surv., 422M.Google Scholar
Shantzer, E. V., 1951. Alluvium of plains rivers in a temperate zone and its significance for understanding the laws governing their structure and formation of alluvial suites (in Russian). Trudy Inst. Geol. Nauk, Mosk., 135, 1–271.Google Scholar
Smith, N. D., 1970. The braided stream depositional environment: comparison of the Platte river with some Silurian clastic rocks, North-Central Appalachians. Bull. Geol. Soc. Am., 81, 2993–3014.CrossRefGoogle Scholar
Smith, N. D., 1972. Some sedimentological aspects of planar cross stratification in a sandy braided river. J. Sedim. Petrol., 42, 624–634.Google Scholar
Thorarinsson, S., 1956. The Thousand Years Struggle against Ice and Fire. Reykjavik: Boavtgefa Menningarsdjods.Google Scholar
Williams, P. F. and Rust, B. R., 1969. The sedimentology of a braided river. J. Sedim. Petrol., 39, 649–679.Google Scholar