Journal ArticleDOI
Vertical Transfer in Open Channel Flow
TLDR
In this paper, the vertical turbulent mass transfer coefficients for suspended sediment particles and dye, and fall velocities of the sediment particles were determined experimentally in a large laboratory flume.Abstract:
Vertical turbulent mass transfer coefficients for suspended sediment particles and dye, and fall velocities of the sediment particles were determined experimentally in a large laboratory flume. Local values of the turbulent mass transfer coefficient, and turbulent fall velocities for the sand, were determined from an integrated form of the transfer equation. The results of the experiments indicate that: (1) Magnitude and distribution of the vertical turbulent mass transfer coefficient for dye and fine sediment are close to those of the momentum transfer coefficient, which lends added support to Reynolds' analogy for the equivalence of mass and momentum transfer in turbulent shear flow; (2) in comparison with dye, the mass transfer coefficient for medium sand is somewhat less in magnitude and its distribution indicates that the transfer coefficient is larger near the bed; and (3) the fall velocity of sediment particles is larger in turbulent channel flow than in quiescent water.read more
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Journal ArticleDOI
Open‐channel Flow Measurements with a Laser Doppler Anemometer
Iehisa Nezu,Wolfgang Rodi +1 more
TL;DR: In this article, it was shown that the log-law can be applied strictly only to the nearwall region and the von K´rm´n constant κ and integral constant A are truly universal, having values of κ=0.412 and A=5.29 irrespective of the Reynolds and Froude number.
Journal ArticleDOI
A critical review of sedimentation trap technique
J. Bloesch,N. M. Burns +1 more
TL;DR: The best sediment trap for limnology is a simple cylinder with a diameter of from 5 to 20 cm and aspect ratio of greater than 5 for small lakes and greater than 10 for more turbulent water bodies.
Journal ArticleDOI
Cohesive sediment transport i: process description
TL;DR: Physical processes constituting fine, cohesive sediment transport in estuarial waters are described in this paper, which are typically interlinked by the cyclic nature of the tide dominated environment.
Journal ArticleDOI
Theoretical modeling of the generation, movement, and emplacement of pyroclastic flows by column collapse
TL;DR: In this article, a model for the physical processes that occur in the formation of pyroclastic flows generated by the gravitational collapse of a vertical eruption column is presented, where the main controlling parameters are considered to be the vent radius, gas content, and initial velocity of the gas.
Journal ArticleDOI
Stratified flow in pyroclastic surges
TL;DR: In this paper, a model incorporating turbulent transport, stratified flow, and time evolution of pyroclastic surges is proposed for deposits which have been attributed to both pyro-clastic flow and surge transport by various workers.