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Author : Steven A. Arcone
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (319 download)
Download or read book Radar Profiling of Ice Thickness written by Steven A. Arcone and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (42 download)
Download or read book Cold Regions Technical Digest written by and published by . This book was released on 1985 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 550 pages
Book Rating : 4.:/5 (319 download)
Download or read book CRREL Report written by and published by . This book was released on 1987 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (318 download)
Download or read book Evaluation of the Magnetic Induction Conductivity Method for Detecting Frazil Ice Deposits written by and published by . This book was released on 1987 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to map frazil ice deposits and water channels beneath an ice-covered river in central Alaska using the magnetic induction conductivity (MI) technique has been assessed. The study was performed during the first week of March of 1986 on the Tanana River near Fairbanks and employed a commercially available instrument operating at a fixed frequency with a fixed antenna (coil) spacing and orientation. Comparisons of the MI data with theoretical models based upon physical data measured along three cross sections of the river demonstrate the sensitivity of the MI technique to frazil ice deposits. The conductivity generally derived for the frazil ice deposits encountered is very low (approx. .00063 s/m) when compared with the measured value for water (approx. 0.011 S/m), and is similar to the calculated values for gravel and sandy gravel bed sediments. In all three cross sections, maxima in the apparent conductivity profiles correlated with frazil ice deposits. Difficulties, possibly due to adverse effects of cold weather upon instrument calibration, affected the quantitative performance of the instrument on one cross section, although the interpretation of the data (locations of open channels vs frazil deposits) was qualitatively unaffected. Keywords: Resistivity surveying.
Author :
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ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (319 download)
Download or read book Cold Regions Technical Digest written by and published by . This book was released on 1991 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 444 pages
Book Rating : 4.3/5 (91 download)
Download or read book U.S. Army Corps of Engineers Fifth Remote Sensing Symposium, October 28-30, 1985, Ann Arbor, Michigan, USA written by and published by . This book was released on 1986 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven A. Arcone
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.3/5 (91 download)
Download or read book Short-pulse Radar Investigations of Freshwater Ice Sheets and Brash Ice written by Steven A. Arcone and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Short-pulse radar profiles and waveform traces were recorded over natural, freshwater ice sheets and an artificially made, 1.6-m-diameter column of brash ice. The purpose was to study the feasibility of this type of radar to detect ice thickness, determine ice properties and distinguish ice forms. The radar utilized two antennas: one with a spectrum centered near 900 MHz and a second more powerful one near 700 MHz. Distinct top and bottom reflections from several ice sheets were produced by both antennas, but the value of dielectric permittivity calculated from the time of delay of the reflections varied between sheets as one ice sheet was ready to candle and contained free water. The brash ice distorted signals and allowed no discernible bottom return. The lower frequency antenna also gave returns from the lake bottom (separated from the ice bottom by about 1 m of water), which could allow ice thickness to be determined indirectly. The report concludes that these antennas can be used to determine sheet ice thickness and to supply information to help in the detection of brash ice. The water content of an ice sheet may also be estimated if independent studies show a correlation between dielectric permittivity and free water content.
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ISBN 13 :
Total Pages : 1060 pages
Book Rating : 4.:/5 (891 download)
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1983 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 988 pages
Book Rating : 4.:/5 (31 download)
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1986-05 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Environmental Science Information Center. Library and Information Services Division
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ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.0/5 ( download)
Download or read book Accessions List written by Environmental Science Information Center. Library and Information Services Division and published by . This book was released on 1985 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kevin O'Neill
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.3/5 (91 download)
Download or read book Investigations of Freshwater and Ice Surveying Using Short-pulse Radar written by Kevin O'Neill and published by . This book was released on 1991 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: An overview is presented of recent activities and results in the use of commercially available short-pulse UHF radar for surveying ice conditions on freshwater bodies. Improvements in radar systems have made it possible to increase ice thickness resolution by as much as one third relative to that in past attempts, and some new signal processing approaches shown here may offer an order of magnitude improvement. Results from airborne surveying are shown in which the varieties of ice character are reflected. Given the lack of ground coupling, one can rely upon a reasonably well-defined wavelet structure for enhanced signal processing and interpretation possibilities. An algorithm is presented that locates returns from interfaces in the presence of noise for a non-minimum delay wavelet. The method performs a simple inversion in the frequency domain, enhanced by a time dependent weight designed to recognize the shape of the wavelet amplitude and phase spectra. Thin ice layers are resolved down to a few centimeters and are distinguished from an ice free condition by means of a matched filter system designed to recognize the interference pattern from parallel interfaces close to one another. The effects and constraints imposed by water layers on wet ice are discussed, as are general attenuation, sloping bottom, and critical angle effects in deeper water.
Author : United States. National Environmental Satellite, Data, and Information Service. Library and Information Services Division
Publisher :
ISBN 13 :
Total Pages : 606 pages
Book Rating : 4.F/5 ( download)
Download or read book Accessions List written by United States. National Environmental Satellite, Data, and Information Service. Library and Information Services Division and published by . This book was released on 1983 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 952 pages
Book Rating : 4.3/5 (91 download)
Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1986 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Assessment and Information Services Center (U.S.). Library and Information Services Division
Publisher :
ISBN 13 :
Total Pages : 606 pages
Book Rating : 4.3/5 ( download)
Download or read book Accessions List written by Assessment and Information Services Center (U.S.). Library and Information Services Division and published by . This book was released on 1983 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : American Congress on Surveying and Mapping
Publisher :
ISBN 13 :
Total Pages : 326 pages
Book Rating : 4.:/5 (318 download)
Download or read book Technical Papers: Remote sensing written by American Congress on Surveying and Mapping and published by . This book was released on 1986 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (3 download)
Download or read book The Coast Guard Engineer's Digest written by and published by . This book was released on 1979 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 632 pages
Book Rating : 4.:/5 (42 download)
Download or read book Symposium on Ice 1986 written by and published by . This book was released on 1986 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
