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Publikācija: The Analysis of Ground Penetrating Radar Signals Acquired in Cenas Tirelis

Publication Type Publications in RTU scientific journal
Funding for basic activity Unknown
Defending: ,
Publication language Latvian (lv)
Title in original language Cenas tīrelī iegūto radiolokācijas signālu analīze
Title in English The Analysis of Ground Penetrating Radar Signals Acquired in Cenas Tirelis
Field of research 1. Natural sciences
Sub-field of research 1.4 Chemical sciences
Authors Jānis Karušs
Valdis Segliņš
Keywords ground radar, geophysics, Cenas tirelis, peat electromagnetic properties
Abstract Pētījums ir veltīts purvu nogulumos iegūto radiolokācijas signālu analīzei un interpretācijai. Tiek sniegts pētījumu teritorijas ģeoloģiskās uzbūves apraksts, izmantotās pētījumu metodikas apraksts darbā ar 300 MHz antenu sistēmu, analizēta kūdras sadalīšanās pakāpe, pelnainība un dabiskais mitrums. Tāpat ir sniegta detāla iegūto radiolokācijas signālu analīze. Secināts, ka elektromagnētisko viļņu izplatīšanās ātrumu kūdrā nenosaka tikai kūdras mitruma daudzuma izmaiņas. Pētījumos ar radiolokācijas metodi elektromagnētisko viļņu izplatīšanās ātrums kūdras slāņos jānosaka ar augstu precizitāti, izmantojot kopējā viduspunkta metodi
Abstract in English This research is devoted to the analysis and interpretation of ground penetrating radar signals obtained in bog deposits. Research goals are to find out peat physical properties that mainly determine peat electromagnetic properties and also to identify reflected ground penetrating radar signal properties and offer their geological interpretation. This paper includes the description of research area geological structure, description of applied ground penetrating radar research methodology, results of peat humification analysis, results of organic matter content and moisture content analysis. In addition, the paper deals with the detailed ground penetrating radar signal analysis, which includes the analysis of amplitude and phase of the obtained ground penetrating radar signals. Attention was also paid to possibilities to identify the obtained ground penetrating radar signals. The results obtained in this research indicate that 300 MHz antenna system is applicable to performing similar studies. It is expected that with 300 MHz antenna system informative ground penetrating radar signals will be obtained from the depth of 4.5 meters. Data analysis shows that in boreholes it is possible to identify 4 peat layers with different moisture content, that are traceable throughout research area. Boundaries between these layers are considered to be possible reflection surfaces of ground penetrating radar signal. It is also possible to trace boundaries between peat layers with different degree of humification throughout research area. Boundaries between peat layers with different ash content which are traceable throughout research area were not identified in this research. It is concluded that an electromagnetic wave propagation speed in peat layers must be determined with high precision using a common midpoint method and in previous studies the opinion has been expressed that an electromagnetic wave propagation speed in peat layers determines only moisture content is incorrect.
DOI: 10.7250/msac.2013.015
Reference Karušs, J., Segliņš, V. The Analysis of Ground Penetrating Radar Signals Acquired in Cenas Tirelis. Materials Sciences and Applied Chemistry. Vol.29, 2013, pp.21-28. ISSN 1407-7353. e-ISSN 2255-8713. Available from: doi:10.7250/msac.2013.015
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