A study of estuarine flow using the roving adcp data

2008 ◽  
Vol 43 (2) ◽  
pp. 81-90 ◽  
Author(s):  
Kiryong Kang ◽  
Daniela Di Iorio
Keyword(s):  
Adcp Data ◽  
Estuarine Flow

scholarly journals Comparison of Buoy-Mounted and Bottom-Moored ADCP Performance at Gray’s Reef

2007 ◽  
Vol 24 (2) ◽  
pp. 270-284 ◽  
Author(s):  
Harvey E. Seim ◽  
Catherine R. Edwards
Keyword(s):  
High Frequency ◽  
Major Axis ◽  
National Data ◽  
Noise Floor ◽  
The North ◽  
Experimental Configuration ◽  
Adcp Measurements ◽  
Adcp Data ◽  
Adcp Observations ◽  
East West

Abstract Simultaneous ADCP profile measurements are compared over a 2-month period in late 2003. One set of measurements comes from a National Data Buoy Center (NDBC) buoy-mounted ADCP, the other from a bottom-mounted, upward-looking ADCP moored roughly 500 m from the buoy. The study was undertaken to evaluate the proficiency of an experimental configuration by NDBC; unfortunately, the ADCP was not optimally configured. The higher temporally and vertically resolved bottom-mounted ADCP data are interpolated in time and depth to match the buoy-mounted ADCP measurements. It is found that the two ADCP measurements are significantly different. The buoy-mounted measurements are affected by high-frequency (<10 h period) noise that is vertically coherent throughout the profiles. This noise results in autospectra that are essentially white, unlike the classic red spectra formed from the bottom-mounted ADCP observations. The spectra imply a practical noise floor of 0.045 m s−1 for the buoy-mounted system. Contamination by surface waves is the likely cause of this problem. At tidal frequencies the buoy-mounted system underestimates major axis tidal current magnitude by 10%–40%; interference from the buoy chain and/or fish or plankton are considered the most likely cause of the bias. The subtidal velocity field (periods greater than 40 h) is only partially captured; the correlation coefficient for the east–west current is 0.49 and for the north–south current is 0.64.

scholarly journals Referencing geostrophic velocities using ADCP data Referencing geostrophic velocities using ADCP data

2010 ◽  
Vol 74 (2) ◽  
pp. 331-338 ◽  
Author(s):  
Isis Comas-Rodríguez ◽  
Alonso Hernández-Guerra ◽  
Elaine L. McDonagh
Keyword(s):  
Adcp Data ◽  
Geostrophic Velocities

Reliability of ADCP data detided with a numerical model on the East China Sea shelf

2007 ◽  
Vol 63 (1) ◽  
pp. 135-141 ◽  
Author(s):  
Atsuhiko Isobe ◽  
Takahiro Kuramitsu ◽  
Hirotaka Nozaki ◽  
Pil-Hun Chang
Keyword(s):  
Numerical Model ◽  
East China Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
East China Sea Shelf ◽  
Adcp Data

Assimilation of Ship-Mounted ADCP Data for Barotropic Tides: Application to the Ross Sea

2005 ◽  
Vol 22 (6) ◽  
pp. 721-734 ◽  
Author(s):  
S. Y. Erofeeva ◽  
Laurie Padman ◽  
Gary Egbert
Keyword(s):  
Numerical Solutions ◽  
Ross Sea ◽  
Acoustic Doppler Current Profiler ◽  
Tidal Currents ◽  
Open Boundary ◽  
Open Boundary Conditions ◽  
Current Profiler ◽  
Inverse Solutions ◽  
Adcp Data ◽  
Mean Circulation

Abstract The application of a generalized inverse approach for assimilating vessel-mounted acoustic Doppler current profiler (VM-ADCP) data into numerical solutions of barotropic tides is described. The derived estimates of tidal currents can be used to detide the VM-ADCP data and expose underlying mean circulation. The methodology is illustrated with data assimilation models of tidal currents in the Ross Sea. The prior solution, obtained by solving the nonlinear shallow-water equations by time stepping with a linear bottom friction parameterization and elevation of open boundary conditions obtained from a circum-Antarctic tide model, provides reasonably good fit to most available moored current meter data. Two inverse solutions were obtained: one assimilating moored current meter records and the other assimilating three cruises of VM-ADCP data. Fitting either the mooring time series or the VM-ADCP records leads to only small changes relative to the prior solution currents, except over the shelf break where short length scale, energetic diurnal topographic vorticity waves are present. It is shown that the dynamics embedded in the representer functions provides reasonable tidal corrections even with no prior information about forcing at open boundaries.

Enhanced mixing downstream of a pile in an estuarine flow

2008 ◽  
Vol 74 (1-2) ◽  
pp. 505-527 ◽  
Author(s):  
H.U. Lass ◽  
V. Mohrholz ◽  
M. Knoll ◽  
H. Prandke
Keyword(s):  
Estuarine Flow
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