By D Maddy; Mark G Macklin; Jamie C Woodward; Fluvial Archives Group
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Extra info for River basin sediment systems: archives of environmental change
All this makes palaeohydrological reconstructions much more difficult, and linear relationships between mean or maximum particle size and average hydraulic transport parameters more dubious. A second point is that there may be qualitatively different properties in particle-type entities at this level – the distinction between cohesive and non-cohesive sediment that is particularly important for channel bank failure, for example (see Thorne, 1982). Again, the products of high-concentration grain flows, as in debris flows, may be distinctive (see Costa, 1984).
Alluvial Systematics. Level 0 Particles Scales of size, sorting, shape, etc. may be assigned to classes. g. poorly-sorted gravel Lithofacies coding (Miall, 1977) Level I Strata sets Involve sets and cosets of sheets, lenses, wedges, lobes, etc. Contacts may be concordant and non-erosional, or discordant and erosional, reflecting depositional patterns. In section may involve lithofacies sequences; surface lineations may be mappable from ground survey or remote sensing imagery. g. individual point bar scrolls, growth increments Level II Form units Generally relate to sediment supply/energy environments.
Eds) Braided Rivers. London: The Geological Society, 119-127. G. P. 1964. Fluvial Processes in Geomorphology. H. Freeman. V. 1944. Stream trough experiments and terrace formation. Geological Magazine, 81: 241-253. T. D. 1992. Historical floods and vertical accretion of fine grained alluvium in the Lower Tyne Valley, North East England. R. & Tacconi, P. (eds) Dynamics of Gravel Bed Rivers, Chichester: John Wiley, 573-589. G. & Lewin, J. 1986. Terraced fills of Pleistocene and Holocene age in the Rheidol Valley, Wales.
River basin sediment systems: archives of environmental change by D Maddy; Mark G Macklin; Jamie C Woodward; Fluvial Archives Group