The steady state thermal structure of eroding orogenic belts and accretionary prisms

1993 ◽  
Vol 98 (B3) ◽  
pp. 4487-4507 ◽  
Author(s):  
Leigh H. Royden
Keyword(s):  
Steady State ◽  
Thermal Structure ◽  
Accretionary Prisms ◽  
Orogenic Belts

scholarly journals Research on Discrete Data Analysis of Vehicle Retread Tire Performance Based on Radial Stiffness Method

2021 ◽  
Vol 2074 (1) ◽  
pp. 012035
Author(s):  
Peng Qi ◽  
Jiangwei Chu
Keyword(s):  
Numerical Simulation ◽  
Thermal Analysis ◽  
Thermal Stress ◽  
Steady State ◽  
Thermal Structure ◽  
Analysis Model ◽  
Coupling Field ◽  
Radial Stiffness ◽  
Simulation Calculation ◽  
Stiffness Method

Abstract The retreaded tires of transportation vehicles often cause delamination and tearing of the tread and carcass due to the temperature rise of the tires. For the failure analysis and rational use of the retreaded tires, a steady-state thermal analysis model of the retreaded radial tires in the rolling state is established and carried out the temperature measurement test. On this basis, the numerical simulation, simulation calculation and experimental analysis of the thermal-structure coupling field are carried out, which truly reflects the thermal stress status of the retreaded tire.

scholarly journals Estimation of nocturnal<sup>222</sup>Rn soil fluxes over Russia from TROICA measurements

2013 ◽  
Vol 13 (23) ◽  
pp. 11695-11708 ◽  
Author(s):  
E. V. Berezina ◽  
N. F. Elansky ◽  
K. B. Moiseenko ◽  
I. B. Belikov ◽  
R. A. Shumsky ◽  
...  
Keyword(s):  
Thermal Structure ◽  
Regional Scale ◽  
Tectonic Activity ◽  
Northern Eurasia ◽  
Atmospheric Conditions ◽  
Accumulation Rates ◽  
Near Surface ◽  
Far Eastern Russia ◽  
Orogenic Belts ◽  
Far Eastern

Abstract. In TROICA (TRanscontinental Observations Into the Chemistry of the Atmosphere) campaigns (1999–2008), the simultaneous observations of near surface 222Rn concentrations and atmospheric boundary layer thermal structure were performed along the Trans-Siberian Railway across northern Eurasia from Moscow to Vladivostok, including central, southern and far eastern parts of Russia. The data on 222Rn and temperature vertical distribution are used to estimate 222Rn regional scale soil fluxes based on calculations of nocturnal 222Rn accumulation rates in the surface layer under inversion conditions. An effect of seasonal soil thawing on 2–4 times surface 222Rn concentration increase from summer 1999 to autumn 2005 is observed. The estimated 222Rn regional averaged fluxes vary over Russia from 29 ± 8 mBq m−2 s−1 in its so-called European territory to 95 ± 51 mBq m−2 s−1 in the southern area of Siberia. The highest 222Rn fluxes are derived in the regions of high tectonic activity and orogenic belts of central and eastern Siberia and in far eastern Russia. The observed high 222Rn flux variations in specific events show a strong effect of both soil and atmospheric conditions on 222Rn near-surface abundance and the derived seasonal patterns over the continent.

scholarly journals Baroclinic Adjustment and Dissipative Control of Storm Tracks

2018 ◽  
Vol 75 (9) ◽  
pp. 2955-2970 ◽  
Author(s):  
Lenka Novak ◽  
Maarten H. P. Ambaum ◽  
Ben J. Harvey
Keyword(s):  
Steady State ◽  
General Circulation ◽  
Large Scale ◽  
Thermal Structure ◽  
Storm Track ◽  
Circulation Model ◽  
Thermal Forcing ◽  
Dissipative Control ◽  
Additional Support ◽  
Baroclinic Adjustment

Abstract The steady-state response of a midlatitude storm track to large-scale extratropical thermal forcing and eddy friction is investigated in a dry general circulation model with a zonally symmetric forcing. A two-way equilibration is found between the relative responses of the mean baroclinicity and baroclinic eddy intensity, whereby mean baroclinicity responds more strongly to eddy friction whereas eddy intensity responds more strongly to the thermal forcing of baroclinicity. These seemingly counterintuitive responses are reconciled using the steady state of a predator–prey relationship between baroclinicity and eddy intensity. This relationship provides additional support for the well-studied mechanism of baroclinic adjustment in Earth’s atmosphere, as well as providing a new mechanism whereby eddy dissipation controls the large-scale thermal structure of a baroclinically unstable atmosphere. It is argued that these two mechanisms of baroclinic adjustment and dissipative control should be used in tandem when considering storm-track equilibration.

Quantifying thermal variability in subduction zones via data-driven reduced-order modelling

2021 ◽  
Author(s):  
Dave May ◽  
Philip England
Keyword(s):  
Steady State ◽  
Subduction Zone ◽  
Surrogate Model ◽  
Adaptive Sampling ◽  
Subduction Zones ◽  
Thermal Structure ◽  
Data Driven ◽  
Error Estimator ◽  
Reduced Order ◽  
Dehydration Reactions

&lt;p&gt;Subduction zones can give rise to severe natural hazards, e.g. earthquakes, tsunami &amp; volcanism. Improved hazard assessment may be realised through physics based modelling. The thermal structure of a subducting plate has a first order control on many aspects of the subduction zone, including: dehydration reactions; intermediate depth seismicity; melt production; formation of arc volcanoes. Subduction zones exhibit a wide variability with respect to slab age, velocity, dip, rheology and mechanical behaviour of the overriding plate. For many subduction zones the assumption of a thermo-mechanical steady-state is reasonable, hence forward models often assume the form of a kinematically driven slab causing traction-driven mantle wedge flow. Even for this simplified forward model, our understanding of how the parameters and their uncertainties influence the thermal structure is incomplete.&amp;#160;&lt;/p&gt;&lt;p&gt;To address this uncertainty, here we use a data-driven model reduction technique, specifically the interpolated Proper Orthogonal Decomposition (iPOD), to define a fast-to-evaluate and surrogate model of a steady-state subduction zone that is valid over a high-dimensional parameter space. The accuracy of the iPOD surrogate model is controlled using a hyper-rectangle tree-based adaptive sampling strategy combined with a non-intrusive error estimator. To illustrate the applicability of the iPOD, we present examples in which reduced-order models are constructed for combinations of parameters related to the kinematics, rheology and geometry of the subduction zone. The examples will characterize the efficiency and accuracy of the iPOD reduced-order model when using parameter spaces that vary in dimension from 1 to 7.&lt;/p&gt;

Heat flow in a back-arc environment: Intermontane and Omineca Crystalline belts, southern Canadian Cordillera

1984 ◽  
Vol 21 (6) ◽  
pp. 715-726 ◽  
Author(s):  
Earl E. Davis ◽  
Trevor J. Lewis
Keyword(s):  
Steady State ◽  
Heat Flow ◽  
Thermal Structure ◽  
Canadian Cordillera ◽  
Flow Measurements ◽  
Thermal Event ◽  
South Central ◽  
Back Arc ◽  
Glacial Climate ◽  
Reduced Heat Flow

A suite of 20 heat flow measurements has been completed across the Intermontane and Omineca Crystalline belts in south-central British Columbia at about 50°N. Values along the 200 km line are high (83 mW m−2, corrected for Pleistocene glacial climate; reduced heat flow is 67 mW m−2) and uniform (standard deviation = ± 10%). There appears to be no difference in the thermal structure of the two geologic belts. Two sources of heat are considered to explain the level of heat flow observed: a discrete thermal event in the Eocene, and a steady-state supply of heat maintained in the back-arc location by asthenospheric flow caused by nearby subduction. Both can account equally well for the elevated heat flow observed. However, in light of seismic, magnetic, electrical, and flexural data that suggest that the lithosphere may be as thin as 30–40 km, it is concluded that a steady supply of heat must exist since this thickness is much less than the thickness of lithosphere that would be present 50 Ma after even a major thermal event.

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