A positive displacement oscillatory water tunnel / by Karl E. B. Lofquist.

Lofquist, Karl E. B.

doi:10.5962/bhl.title.47549

Cited by 14 publications

(14 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[] estimated bed stress from the rate of working by the drive piston for an oscillating water tunnel. Lofquist [] estimated drag using the measured pressure gradient. Given these differences in measurement technique, the similarity among hydraulic roughness to ripple height ratios obtained is encouraging.…”

Section: Resultsmentioning

confidence: 99%

Observations of the space-time structure of flow, turbulence, and stress over orbital-scale ripples

Hare

Hay

Zedel

et al. 2014

J. Geophys. Res. Oceans

View full text Add to dashboard Cite

The spatial and temporal structure of flow, turbulence, and stress over equilibrium orbital-scale sand ripples are investigated at turbulence-resolving scales with a wide-band coherent Doppler profiler (MFDop) and an oscillating tray apparatus. The oscillation period and horizontal excursion were 10 s and 0.5 m. A single trial was also executed at 0.6 m excursion. Ripple wavelength and amplitude were 25 and 2.2 cm. Ensemble-averaged velocity profiles were acquired with 3 mm vertical resolution at 42 Hz. The spatial pattern of flow as a function of oscillation phase was determined by combining the phase-averaged velocity measurements from trials with the MFDop at different positions relative to a particular ripple crest. The MFDop measurements are used to investigate the coevolution of the lee vortex, turbulent kinetic energy, Reynolds stress, and turbulence production as a function of phase. Shear stress is determined from the vertically integrated vorticity equation and the double-averaged momentum equations. Friction factors obtained from the two methods are comparable and range from 0.1 to 0.2.

show abstract

Section: Resultsmentioning

confidence: 99%

Observations of the space-time structure of flow, turbulence, and stress over orbital-scale ripples

Hare

Hay

Zedel

et al. 2014

J. Geophys. Res. Oceans

View full text Add to dashboard Cite

show abstract

“…The experiments are carried out in an oscillatory-flow water tunnel described by Lofquist (1977). Briefly, it is of U-tube design, and two tight fitting pistons in cylinders, side by side at one end, moving sinusoidally in unison, drive water back and forth through a air at the other end.…”

mentioning

confidence: 99%

Measurements of Oscillatory Drag on Sand Ripples

Lofquist

1980

Coastal Engineering 1980

Self Cite

View full text Add to dashboard Cite

“…Hawaii has the highest occurrence of multigenerational households in the nation, at 11% compared to a national average of 5.6% (Lofquist, 2012). Hawaii has the highest occurrence of multigenerational households in the nation, at 11% compared to a national average of 5.6% (Lofquist, 2012).…”

Section: Economic Indicatorsmentioning

confidence: 96%

“…Of the households in Hawaii, 11% contain three or more parent-child generations (Lofquist, 2012). Of the households in Hawaii, 11% contain three or more parent-child generations (Lofquist, 2012).…”

Section: Social Indicatorsmentioning

confidence: 99%

Research Article: GPI Island Style: Localizing the Genuine Progress Indicator to Hawaii

Ostergaard-Klem

Oleson

2014

Environmental Practice

View full text Add to dashboard Cite

Applying the Genuine Progress Indicator (GPI) to an island setting offers insight into whether and how standardization of subnational GPI models can adequately capture important local conditions and inform local policy. We argue in favor of localization and against scaling down national data and transferring valuation studies to Hawaii because of the state's unique setting. To localize GPI to our context, we suggest (a) omitting some indicators that are not applicable to Hawaii; (b) expanding and discretizing the list of indicators to other important economic, environmental, and social changes; and (c) amending existing indicators to better reflect their contribution to Hawaii's welfare. This would involve (a) improving local data on economic, social, and environmental changes; (b) building new indicators through a participatory process; and (c) conducting local valuation studies that accurately reflect the social value of the changes. Environmental Practice 16: 182-193 (2014) GDP and Beyond GDP measures all goods and services that are produced by an economy within its borders during a year. While increases in GDP are generally associated with the so-called healthy growth of an economy, GDP fails to account for many other factors impacting welfare , such as unpaid labor, pollution externalities, ecosystem degradation, defensive expenditures, capital depreciation, and income inequality.Despite the inability of GDP to capture social welfare, the measure continues to play a critical role in today's policy

show abstract

A positive displacement oscillatory water tunnel / by Karl E. B. Lofquist.

Cited by 14 publications

References 3 publications

Observations of the space-time structure of flow, turbulence, and stress over orbital-scale ripples

Observations of the space-time structure of flow, turbulence, and stress over orbital-scale ripples

Measurements of Oscillatory Drag on Sand Ripples

Research Article: GPI Island Style: Localizing the Genuine Progress Indicator to Hawaii

Contact Info

Product

Resources

About