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Developing a model for predicting snowpack parameters affecting vehicle mobility (1983)

Berger, Roger H. [VerfasserIn] ; Cold Regions Research and Engineering Laboratory 〈Hanover, NH〉

Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory

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Umfang: 34 Seiten , Illustrationen

Serie: CRREL Report 83-16

Inhalt: The presence of snow on the ground can impose limitations on the mobility of wheeled and tracked vehicles. Snow depth and density are the two most easily measured snow properties that can be related to mobility over snow. Existing models of snowpack accumulation and ablation processes and models of internal snowpack structure were examined to determine if a model of the snowpack can be developed for use in predicting the snow parameters that affect mobility. Simple models, such as temperature index models, do not provide sufficient snowpack details, and the more detailed models require too many measured inputs. Components of the various models were selected from a basis of a snowpack model for predicting snow properties related to mobility over snow. Methods of obtaining the input data from some components are suggested, and areas where more development is needed are described.

Anmerkung: CONTENTS Abstract Preface Nomenclature Conversion of metric units Introduction Review of existing models Accumulation models Ablation models Using existing models for studying mobility Proposed snowpack model for mobility studies Model components Implementation of the model Developing input data Conclusions Literature cited

In: CRREL Report, 83-16

Sprache: Englisch

Schlagwort(e): Forschungsbericht

URL: https://apps.dtic.mil/docs/citations/ADA134878

URL: https://hdl.handle.net/11681/9338

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Snowpack optical properties in the infrared (1979)

Berger, Roger H. [VerfasserIn] ; Cold Regions Research and Engineering Laboratory 〈Hanover, NH〉

Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory

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Umfang: iii, 9 Seiten , Illustrationen

Serie: CRREL Report 79-11

Inhalt: A theory of the optical properties of snow in the 2-20 region of the infrared has been developed. Using this theory it is possible to predict the absorption and scattering coefficients and the emissivity of snow, as a function of the snow parameters of grain size and density, for densities between 0.17 and 0.4 g/cm3. The absorption and scattering coefficients are linearly related to the density and inversely related to the average grain size. The emissivity is independent of grain size and exhibits only a weak dependence upon density.

In: CRREL Report, 79-11

Sprache: Englisch

Schlagwort(e): Forschungsbericht

URL: https://cdm16021.contentdm.oclc.org/digital/collection/p266001coll1/id/5313

URL: https://hdl.handle.net/11681/9010

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Detecting structural heat losses with mobile infrared thermography; Part I: Description of technique (1974)

Munis, Richard H. [VerfasserIn] ; Berger, Roger H. [VerfasserIn] ; Marshall, Stephen J. [VerfasserIn] ; [weitere]

Hanover, N.H. : U.S. Army Cold Regions Research and Engineering Laboratory

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Umfang: iii, 13 Seiten , Illustrationen

Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 326

Inhalt: CONTENTS: Preface. - Introduction. - Principle of the IR scanner. - Advantages of mobile infrared thermography. - Discussion of field measurements. - Recommendations for future work on thermography of buildings. - Other potential applications of infrared thermography of buildings. - Appendix A: Thermograms of northern exposure of USA CRREL building. - Appendix B: Sample thermograms of heat loss survey at Pease Air Force Base. -Appendix C: Sample thermograms of heat loss survey at Dartmouth College. - Abstract.

Inhalt: A method to assess quickly the insulation effectiveness of buildings using mobile infrared thermography has been developed at USA CRREL. In contrast to the infrared thermography done in Sweden, this method concentrates on obtaining useful data by measuring the outside surface temperature of structures. This report outlines the basic principles involved in these measurements, and discusses field measurements and the inherent advantages of infrared thermography. Typical thermograms are presented in the appendixes.

Anmerkung: MAB0014.001: ZSP-202-326 , Online frei verfügbar

In: Detecting structural heat losses with mobile infrared thermography / R.H. Munis, S.J. Marshall and M.A. Bush, Part I

In: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command, 326

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Sprache: Englisch

Schlagwort(e): Forschungsbericht

URL: http://www.worldcat.org/oclc/831686783

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Detecting structural heat losses with mobile infrared thermography; Part II: Survey of Pease Air Force Base, Portsmouth, New Hampshire (1975)

Munis, Richard H. [VerfasserIn] ; Berger, Roger H. [VerfasserIn] ; Marshall, Stephen J. [VerfasserIn] ; [weitere]

Hanover, N.H. : U.S. Army Cold Regions Research and Engineering Laboratory

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Umfang: iii, 29 Seiten , Illustrationen

Serie: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 338

Inhalt: CONTENTS: Abstract. - Preface. - Introduction. - Discussion of heat loss survey of six housing units. - Survey of base facilities. - Conclusions. - Literature cited.

Inhalt: During the winter of 1973-74 a mobile infrared thermography system was used to survey housing units and base facilities at Pease Air Force Base, Portsmouth, New Hampshire. This report provides both qualitative and quantitative evidence regarding heat flow out of the eave vents of these housing units. Calculations indicate that a significant amount of heat is being lost in this manner due to inadequate attic (cap) insulation. Possible evidence of incomplete ventilation could explain the presence of condensation in the housing units. Analyses of thermograms are presented to show the possible existence of low and high pressure areas around a structure and how they relate to heat loss.

Anmerkung: MAB0014.001: ZSP-202-338 , Online frei verfügbar

In: Detecting structural heat losses with mobile infrared thermography / R.H. Munis, S.J. Marshall and M.A. Bush, Part II

In: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command, 338

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Sprache: Englisch

Schlagwort(e): Forschungsbericht

URL: http://www.worldcat.org/oclc/227388627

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