TY - JOUR
T1 - An insitu borescopic quantitative imaging profiler for the measurement of high concentration sediment velocity
AU - Cowen, Edwin A.
AU - Dudley, Russell D.
AU - Liao, Qian
AU - Variano, Evan A.
AU - Liu, Philip L.F.
N1 - Funding Information:
The authors thank John D. Powers, Yong Sung Park, and P.J. Rusello for their help with the details of the design, construction, and testing of the BQuIP. Prof. Cowen gratefully acknowledges the John Simon Guggenheim Memorial Foundation and the Spanish Ministerio de Educación y Ciencia for supporting his time to develop the analysis approach described in this manuscript. The authors wish to thank the Office of Naval Research (N00014-05-1-0223) and the National Science Foundation (OCE-0452862) for supporting the hardware development described herein. Mr. Dudley gratefully acknowledges the fellowship support of the Cornell Science Inquiry Partnership (funded by the National Science Foundation DGE-0231913).
PY - 2010/7
Y1 - 2010/7
N2 - The design, calibration, and testing of a borescopic quantitative imaging profiler (BQuIP) system, suitable for the insitu measurement of two components of the instantaneous velocity in high sediment concentration flows, are presented. Unlike planar quantitative imaging techniques, BQuIP has a concentration-dependent field of view, requiring detailed calibration. BQuIP is demonstrated in unidirectional sheet flow in an open channel flume with a narrow-graded sand with median diameter 0.25 mm. Acoustic velocity measurements are made in the suspension region above the BQuIP measured region yielding a continuous measurement of velocity and turbulent stress from the immobile bed to just below the free surface. The temporal history at a point reveals the sheet flow sediment velocities to be highly intermittent, and the spectra reveal a broad range of temporal scales close to -5/3 in slope for the streamwise velocity component. At its core BQuIP is a quantitative imaging technique giving it significant flexibility in terms of both the spatial and temporal analysis parameters (e.g., interrogation subwindow size and Δt, the time between images in a pair to be analyzed), allowing it to have tremendous dynamic range in terms of the velocities that can be measured.
AB - The design, calibration, and testing of a borescopic quantitative imaging profiler (BQuIP) system, suitable for the insitu measurement of two components of the instantaneous velocity in high sediment concentration flows, are presented. Unlike planar quantitative imaging techniques, BQuIP has a concentration-dependent field of view, requiring detailed calibration. BQuIP is demonstrated in unidirectional sheet flow in an open channel flume with a narrow-graded sand with median diameter 0.25 mm. Acoustic velocity measurements are made in the suspension region above the BQuIP measured region yielding a continuous measurement of velocity and turbulent stress from the immobile bed to just below the free surface. The temporal history at a point reveals the sheet flow sediment velocities to be highly intermittent, and the spectra reveal a broad range of temporal scales close to -5/3 in slope for the streamwise velocity component. At its core BQuIP is a quantitative imaging technique giving it significant flexibility in terms of both the spatial and temporal analysis parameters (e.g., interrogation subwindow size and Δt, the time between images in a pair to be analyzed), allowing it to have tremendous dynamic range in terms of the velocities that can be measured.
UR - http://www.scopus.com/inward/record.url?scp=77953808648&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77953808648&partnerID=8YFLogxK
U2 - 10.1007/s00348-009-0801-8
DO - 10.1007/s00348-009-0801-8
M3 - Article
AN - SCOPUS:77953808648
SN - 0723-4864
VL - 49
SP - 77
EP - 88
JO - Experiments in Fluids
JF - Experiments in Fluids
IS - 1
ER -