The response of high density turbidity currents and their deposits to an abrupt channel termination at a slope break: Implications for channel–lobe transition zones
نویسندگان
چکیده
The transition between the slope and basin floor is typically marked by a break, in some cases causing channels to terminate turbidity currents undergo loss of confinement. It thus essential understand how these breaks losses confinement influence hydrodynamic evolution impact their depositional variability within natural scale channel mouth settings. Flume experiments, utilizing Shields scaling, are conducted study angle (3°, 6° 9°) initial suspended sediment concentrations (12 18% volume) hydrodynamics deposit geometries high density currents, subject simultaneous break Measured velocity concentration profiles indicate that supercritical, with mean velocities 0.80 m s−1 1.04 depth-averaged basal 9.2% 23.9%, yielding bed shear 0.050 0.064 s−1. Upon encountering confinement, exhibit increases densimetric Froude numbers velocities. This due primarily two factors: firstly, continue accelerate during an period lag as residual momentum gradually dissipates; and, secondly, expansion via flow relaxation collapses structure towards bed. corresponding processes reveal produce elongate channel–lobe zones disconnect deposits. length width ratios decrease increase, while reduction reduces ratios. Corresponding, lobe elements observed increase length, thickness increasing concentrations, dimensions enhanced deposition.
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ژورنال
عنوان ژورنال: Sedimentology
سال: 2023
ISSN: ['1365-3091', '0037-0746']
DOI: https://doi.org/10.1111/sed.13073