Temperature measurements and high-resolution IR images of mines at an arid site

2004 ◽  
Author(s):  
Anh H. Trang ◽  
Brian A. Baertlein
Keyword(s):  
High Resolution ◽  
Temperature Measurements

scholarly journals Turbulence parameter estimations from high-resolution balloon temperature measurements of the MUTSI-2000 campaign

2005 ◽  
Vol 23 (7) ◽  
pp. 2401-2413 ◽  
Author(s):  
N. M. Gavrilov ◽  
H. Luce ◽  
M. Crochet ◽  
F. Dalaudier ◽  
S. Fukao
Keyword(s):  
High Resolution ◽  
Potential Temperature ◽  
Structure Constant ◽  
Turbulent Energy ◽  
Temperature Measurements ◽  
Temperature Structure ◽  
Vertical Profiles ◽  
Mu Radar ◽  
Vertical Displacements ◽  
Wind Profiles

Abstract. Turbulence parameters in the tropo-stratosphere are analyzed using high-resolution balloon temperature measurements collected during the MUTSI (MU radar, Temperature sheets and Interferometry) campaign which took place near the Middle and Upper atmosphere (MU) radar (Japan, 35° N, 136° E) in May 2000. Vertical profiles of the specific dissipation rate of turbulent kinetic energy, ε, and turbulent diffusivity, K, are estimated from the Thorpe lengthscale, LT. The last is obtained by using two methods. The first one consists of measuring directly LT by reordering the potential temperature profiles. The second method is based on estimates of the temperature structure constant, CT2. A relationship between LT and CT2 can be found by assuming either adiabatic vertical displacements or a model based on turbulent energy balance consideration. Analysis shows that the adiabatic assumption gives indirect estimates of LT more consistent with direct measurements. We also found that vertical profiles of analyzed turbulence characteristics show substantial intermittency, leading to substantial scatter of the local, median and average values. General trends correspond to a decrease in ε and K from the boundary layer up to altitudes 20–25 km. Layers of increased turbulence are systematically observed in the tropo-stratosphere, which may be produced by instabilities of temperature and wind profiles. These maxima may substantially increase local values of turbulence diffusivity. Keywords. Meteorology and atmospheric dynamics (Turbulence)

High resolution temperature measurements in the borehole Yaxcopoil-1, Mexico

2004 ◽  
Vol 39 (6) ◽  
pp. 813-819 ◽  
Author(s):  
H. Wilhelm ◽  
P. Heidinger ◽  
J. Šafanda ◽  
V. Čermák ◽  
H. Burkhardt ◽  
...  
Keyword(s):  
High Resolution ◽  
Temperature Measurements

Quantifying vertical streambed fluxes around woody structures using high-resolution streambed temperature measurements.

2021 ◽  
Author(s):  
Uwe Schneidewind ◽  
Silvia Folegot ◽  
Matthijs van Berkel ◽  
Andrea Bertagnoli ◽  
Ricky van Kampen ◽  
...  
Keyword(s):  
Surface Water ◽  
High Resolution ◽  
Large Scale ◽  
Time Series Data ◽  
Woody Debris ◽  
Temperature Measurements ◽  
Hyporheic Exchange ◽  
Series Data ◽  
Finite Model ◽  
Different Seasons

<p>The quantification of water fluxes across streambeds is an important aspect in the study of groundwater-surface water interactions. One way to deduce fluxes is to use heat as an environmental tracer and measure streambed temperatures. In this study we quantified vertical streambed fluxes over a small reach of the Hammer Stream (West Sussex, UK) that is characterized by a heterogeneous streambed morphology and large woody debris. The Hammer Stream is a meandering lowland stream draining a catchment of 24.6 km<sup>2</sup> with mixed agricultural and forest areas.</p><p>Our 40 m-long study reach is situated in a deciduous forested valley, characterized by sand-dominated streambed sediments and several large-scale instream woody structures. Previous geophysical measurements identified extensive clay lenses at 1-2 m depth within the streambed, in parts disconnecting the upper streambed from the connected aquifer. Nine high-resolution-temperature sensors (HRTS) were deployed in the upper streambed along the investigated reach to monitor streambed temperatures over several days in different seasons (summer, autumn, winter) and to cover the diverse stream morphology. Each HRTS comprised a fiberoptic cable wrapped around a PVC tube and connected to a XT-DTS (Silixa, single-ended mode with alternating measurement directions) system. This setup allowed us to measure streambed temperatures at an effective vertical resolution of less than 0.5 cm about every 2 min. HRTS measurements were accompanied by surface water and air temperature measurements while previous studies provided information on streambed grain size and hydraulic conductivity.</p><p>For analyzing the temperature time-series data we made use of the LPMLEn method, embedded in a newly developed GUI that allows for easy-to-use model setup and estimation of vertical exchange fluxes and thermal streambed parameters. By solving the heat transport equation in the frequency domain for a finite model domain, the LPMLEn method is a continuation of the LPMLE3 method but unlike the latter can make use of temperature information from multiple (n) vertically deployed sensors while optimally taking <span>into account meas</span><span>urement uncertainty during flux estimation.</span></p><p>Results show that streambed temperatures are variable in space and time, with warming/cooling patterns primarily driven by seasonal hydrometeorological conditions. High-flow conditions in winter led to increased hyporheic exchange around the large woody structures.</p>

Identification of boundary heat fluxes in a falling film experiment using high resolution temperature measurements

2005 ◽  
Vol 48 (25-26) ◽  
pp. 5549-5562 ◽  
Author(s):  
Sven Groß ◽  
Marcus Soemers ◽  
Adel Mhamdi ◽  
Faruk Al Sibai ◽  
Arnold Reusken ◽  
...  
Keyword(s):  
High Resolution ◽  
Heat Fluxes ◽  
Temperature Measurements ◽  
Falling Film
Sign in / Sign up

Export Citation Format

Share Document