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3 results for “Friction Estimation”
Simulation data for paper "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan"
<p>Supplementary files for Dubinya, Tikhotskiy paper entitled "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan" prepared for submission to Journal of Geophysical Research: Solid Earth.</p> <p> </p> <p>File "Initial data on fractures.csv" contains initial data on conductivity of natural fractures, their deoths and spatial orientations</p> <p>Files "Unit N, (un)limited friction" contain results of Monte-Carlo simulations completed based on data from fractures from N-th interval. Friction coefficient is varied either between 0 and 1 (unlimited friction), or 0.4 and 0.6 (limited friction).</p>
Data from: The effect of uncertain bottom friction on estimates of tidal current power
Uncertainty affects estimates of the power potential of tidal currents, resulting in large ranges in values reported for a given site, such as the Pentland Firth, UK. We examine the role of bottom friction, one of the most important sources of uncertainty. We do so by using perturbation methods to find the leading-order effect of bottom friction uncertainty in theoretical models by Garrett & Cummins (2005), Vennell (2010), and Garrett & Cummins (2013), which consider quasi-steady flow in a channel completely spanned by tidal turbines, a similar channel but retaining the inertial term, and a circular turbine farm in laterally unconfined flow. We find that bottom friction uncertainty acts to increase estimates of expected power in a fully-spanned channel, but generally has the reverse effect in laterally unconfined farms. The optimal number of turbines, accounting for bottom friction uncertainty, is lower for a fully-spanned channel and higher in laterally unconfined farms. We estimate the typical magnitude of bottom friction uncertainty, which suggests that the effect on estimates of expected power lies in the range −5 to +30%, but is probably small for deep channels such as the Pentland Firth (5-10%). In such a channel, the uncertainty in power estimates due to bottom friction uncertainty remains considerable, and we estimate a relative standard derivation of 30%, increasing to 50% for small channels.
Data from: The effect of uncertain bottom friction on estimates of tidal current power
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