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- W2013148978 abstract "Measurements made within a macrotidal marsh channel using a two-component electromagnetic current meter offer a fundamentally different perspective on the nature and range of fluid motions to that provided by conventional impellor-type sensors. Conditional sampling of near-bed streamwise shear stress series reveals a close match between the physical characteristics of turbulence recorded here, and in previous work in contrasting environments using very different instrumentation. However, conceptual models of turbulent structure derived from laboratory experiments require modification for highly unsteady tidal flows. Firstly, the streamwise turbulent shear team is only one of several terms within the Reynolds stress tensor. Within the channel flows studied here, large normal and mixed cross-product stress terms may be important in maintaining fine cohesive sediment suspension during the flood tide, and in the entrainment of sand during the ebb. Secondly, marked variations in near-bed ‘event-structure’ are associated with large-scale mean flow transients. These are characteristic of meso- and macrotidal marsh channels, and exhibit acceleration terms an order of magnitude larger than those commonly reported for marine boundary layers. Temporal lag effects associated with the decay and production of turbulence provide a possible mechanism for opposing residual transports of mud and sand. Furthermore, they result in a breakdown of empirical ‘burst’ scaling relations devised for steady flows. Identification and scaling of intermittent stress phenomena are also complicated by the lack of consensus on appropriate criteria for the discrimination of coherent motions (events) from background noise." @default.
- W2013148978 created "2016-06-24" @default.
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- W2013148978 date "1992-01-01" @default.
- W2013148978 modified "2023-10-07" @default.
- W2013148978 title "Characteristics and ‘event-structure’ of near-bed turbulence in a macrotidal saltmarsh channel" @default.
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- W2013148978 doi "https://doi.org/10.1016/s0272-7714(05)80126-x" @default.
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