INEXPENSIVE THERMISTOR SENSORS FOR TEMPERATURE MEASUREMENTS IN ORGANIC SOILS

1981 ◽  
Vol 61 (3) ◽  
pp. 521-524
Author(s):  
JAMES A. CAMPBELL ◽  
LOUISE FRASCARELLI
Keyword(s):  
Stainless Steel ◽  
Soil Temperature ◽  
Organic Soil ◽  
In Situ Measurements ◽  
Temperature Measurements ◽  
Organic Soils

Thermistors were incorporated in stainless steel tubular probes and in CPVC epoxy-filled pioe for accurate periodic and continuous in situ measurements of temperature in organic soil. Temperature can be measured with ± 0.1 °C with portable analog meters and ± 0.01 °C with digital meters.

In-situ measurements with fibre Bragg gratings embedded in stainless steel

2014 ◽  
Author(s):  
Dirk Havermann ◽  
Jinesh Mathew ◽  
William N. MacPherson ◽  
Robert R. J. Maier ◽  
Duncan P. Hand
Keyword(s):  
Stainless Steel ◽  
Bragg Gratings ◽  
In Situ Measurements ◽  
Fibre Bragg Gratings

In-Situ Measurements of Load Partitioning in a Metastable Austenitic Stainless Steel: Neutron and Magnetomechanical Measurements

2012 ◽  
Vol 43 (12) ◽  
pp. 4601-4609 ◽  
Author(s):  
David Maréchal ◽  
Chad W. Sinclair ◽  
Philippe Dufour ◽  
Pascal J. Jacques ◽  
Jean-Denis Mithieux
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
In Situ Measurements ◽  
Metastable Austenitic Stainless Steel

Effect of soil moisture and temperature on N2O and CO2 concentrations in soil irrigated with purified wastewater

2013 ◽  
Vol 27 (3) ◽  
pp. 299-304 ◽  
Author(s):  
M. Nosalewicz ◽  
Z. Stępniewska ◽  
A. Nosalewicz
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Soil Moisture ◽  
Soil Temperature ◽  
Similar Pattern ◽  
Organic Soil ◽  
Organic Soils ◽  
Depth Range ◽  
Depth Ranges ◽  
Soil Temperature And Moisture

Abstract Flooded organic soils are potentially important sources of greenhouse gases. The effect of soil temperature and moisture on the concentration of N2O and CO2 at two depths of organic soil flooded with two doses of purified wastewater was studied. Nitrous oxide concentrations at the 10-30 cm depth range were generally increased with an increase in soil moisture, showing dependence on the aeration status of soil. The maximum values of N2O concentrations were higher at the 50-100 than 10-30 cm depth range, but a similar pattern of increasing maximum values of N2O concentration with an increasing input of nitrogen in treatments at both depth ranges was observed. The maximum concentrations of carbon dioxide within the 50-100 cm depth range remained at a similar level in all treatments reaching 7.1-7.7%, which indicated weak relations with the input of water and nitrogen at this depth range. We conclude that the N2O and CO2 concentrations at 10-30 cm depths in the examined organic soil flooded with 600mm year-1 of purified wastewater exhibited a similar level as the concentrations in soil watered only by precipitation.

CHEMICAL, PHYSICAL, AND LAND-USE INVESTIGATIONS OF ORGANIC TERRAIN

1975 ◽  
Vol 55 (3) ◽  
pp. 331-342 ◽  
Author(s):  
M. E. WALMSLEY ◽  
L. M. LAVKULICH
Keyword(s):  
Water Retention ◽  
Particle Density ◽  
Organic Soil ◽  
Surface Expression ◽  
Organic Soils ◽  
Sampling Area ◽  
Temperature Conductivity ◽  
Water Retention Properties ◽  
Physical And Chemical

Chemical and physical properties of selected organic soil samples were studied in relation to the chemical status of the associated ground water. Soil analyses included standard chemical analyses, fibre content, bulk density, particle density, hydraulic conductivity and water retention properties. In situ water chemical analysis included temperature, conductivity, dissolved oxygen and pH. Laboratory measurements of dissolved Ca, Mg, N, K, Si, NO3, F and Cl are also reported. The results are interpreted with reference to the surface expression and overall terrain morphology of the sampling area resulting in the formation of different peat types and associated vegetation. Physical and chemical data indicate a relationship between degree of decomposition and magnitude of various parameters. The distinction between bog and fen areas in terms of the level of dissolved electrolytes permits the prediction of the nature of the material comprising the organic soil. The distinctive properties of organic soils are discussed in terms of some use constraints imposed by the nature of the material in the context of afforestation of this terrain type.

scholarly journals Identification of local organic soils based on cone penetration test results

2014 ◽  
Vol 13 (2) ◽  
pp. 049-056
Author(s):  
Grzegorz Straż
Keyword(s):  
Organic Soil ◽  
Organic Soils ◽  
Test Results ◽  
Penetration Test ◽  
Cone Penetration ◽  
Penetration Testing ◽  
Cone Penetration Testing ◽  
In Situ Conditions

This paper presents the results of attempts to identify organic soils on the basis of test results performed under in situ conditions by cone penetration testing (CPT). The results of 439 selected tests were analysed which reflected the behaviour of local organic soils of organic matter ranging from 6,3 to 17,4%. Crucial to soil investigation were values measured of cone resistance (qc) and sleeve friction (fs) and the friction ratio (Rf) estimated according to those values. To identify organic soils, selected criteria were used, proposed among others by: Mayne, Marr, Bergmann, Schmertmann, Capanella and Robertson [2,5]. An analysis showed that an identification of organic soil types in terms of the present classification of standards, in view of the criteria used, is ambiguous and does not allow to identify them precisely by CPT.

CALIBRATION OF A SINGLE GAMMA PROBE FOR MEASURING WET BULK DENSITY IN ORGANIC SOIL

1980 ◽  
Vol 60 (1) ◽  
pp. 133-135 ◽  
Author(s):  
B. VIGIER ◽  
J. A. CAMPBELL
Keyword(s):  
Bulk Density ◽  
Gamma Probe ◽  
Organic Soil ◽  
Organic Soils ◽  
Sampling Depth ◽  
Density Measurements ◽  
In Situ Calibration ◽  
Probe Calibration

The effect of degree of decomposition and depth of sampling on gamma probe wet bulk density measurements was investigated for two organic soils. Sampling depth did not significantly affect the probe calibration. In situ calibration must be done rather than in laboratory.

scholarly journals A plateau scale soil moisture and soil temperature observatory for quantifying uncertainties in coarse resolution satellite products

2011 ◽  
Vol 8 (1) ◽  
pp. 243-276 ◽  
Author(s):  
Z. Su ◽  
J. Wen ◽  
L. Dente ◽  
R. van der Velde ◽  
L. Wang ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Tibetan Plateau ◽  
Soil Temperature ◽  
In Situ Measurements ◽  
Winter Period ◽  
The Tibetan Plateau ◽  
Monsoon Period ◽  
Coarse Resolution ◽  
Mean And Variance

Abstract. A plateau scale soil moisture and soil temperature observatory is established on the Tibetan Plateau for quantifying uncertainties in coarse resolution satellite products of soil moisture and soil temperature. The observatory consists of three regional networks across the Tibetan Plateau and provides reliable measurements of mean and variance in soil moisture and soil temperature of representative areas comparable in size to coarse satellite footprints. Using these in-situ measurements, a analysis is carried out to assess the reliability of several satellite products derived from AMSR-E and ASCAT data by three retrieval algorithms (henceforth the AMSR-E products, the ASCAT-L2 products and the ITC-model retrievals) for the first time. For the cold semiarid Naqu area, AMSR-E and ASCAT-L2 products overestimate significantly the regional soil moisture in the monsoon seasons. The ITC-model retrievals are closer to the in-situ measurements but the dynamics in the retrieved time series needs further investigation. The use of these datasets is therefore not recommended for cold semiarid conditions on the Tibetan Plateau. For the cold humid Maqu network area AMSR-E and ASCAT-L2 products have comparable accuracy as reported by previous studies in the humid monsoon period. AMSR-E products significantly overestimate and ASCAT-L2 products underestimate the soil moisture in the winter period. The ITC-model retrievals underestimate the soil moisture in general. It is concluded that global coarse resolution soil moisture products are useful but exhibit till now unreported uncertainties in cold and semiarid regions – use of them would be critically enhanced if uncertainties can be quantified and reduced using in-situ measurements.

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