翻訳と辞書 Words near each other ・ Soil sloughing ・ Soil solarization ・ Soil stabilization ・ Soil stabilizer ・ Soil Stabilizer / Road Recycler ・ Soil steam sterilization ・ Soil sterilant ・ Soil Stockpile ・ Soil Stradivarius ・ Soil structure ・ Soil structure interaction ・ Soil survey ・ Soil Survey Program ・ Soil test ・ Soil texture ・ Soil thermal properties ・ Soil type ・ Soil Use Efficiency ・ Soil value ・ Soil vapor extraction ・ Soil water (retention) ・ Soil zoology ・ Soil-Adjusted Vegetation Index ・ Soil-borne wheat mosaic virus ・ Soil-transmitted helminthiasis ・ Soil2O ・ Soila ・ Soilbleed ・ Soilbleed Redux ・ Soile Isokoski Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Soil thermal properties ： ウィキペディア英語版 Soil thermal properties The thermal properties of soil are a component of soil physics that has found important uses in engineering, climatology and agriculture. These properties influence how energy is partitioned in the soil profile. While related to soil temperature, it is more accurately associated with the transfer of heat throughout the soil, by radiation, conduction and convection. The main soil thermal properties are: *Volumetric heat capacity, SI Units: J∙m−3∙K−1 *Thermal conductivity, SI Units: W∙m−1∙K−1 *Thermal diffusivity, SI Units: m2∙s−1 == Measurement == It is hard to say something general about the soil thermal properties at a certain location because these are in a constant state of flux from diurnal and seasonal variations. Apart from the basic soil composition, which is constant at one location, soil thermal properties are strongly influenced by the soil volumetric water content, volume fraction of solids and volume fraction of air. Air is a poor thermal conductor and reduces the effectiveness of the solid and liquid phases to conduct heat. While the solid phase has the highest conductivity it is the variability of soil moisture that largely determines thermal conductivity. As such soil moisture properties and soil thermal properties are very closely linked and are often measured and reported together. Temperature variations are most extreme at the surface of the soil and these variations are transferred to sub surface layers but at reduced rates as depth increases. Additionally there is a time delay as to when maximum and minimum temperatures are achieved at increasing soil depth (sometimes referred to as thermal lag). One possible way of assessing soil thermal properties is the analysis of soil temperature variations versus depth Fourier's law, :$Q\; =\; -\backslash lambda\; dT/dz\; \backslash ,$ where ''Q'' is heat flux or rate of heat transfer per unit area J·m−2∙s−1 or W·m−2, ''λ'' is thermal conductivity W·m−1∙K−1; ''dT''/''dz'' is the gradient of temperature (change in temp/change in depth) K·m−1. The most commonly applied method for measurement of soil thermal properties, is to perform in-situ measurements, using Non-Steady-State Probe systems, or Heat Probes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Soil thermal properties」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.