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Physical properties of coarse particles in till coupled to bedrock composition based on new 3D image analysis method
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics. (Engineering Geology and Geophysics)
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The physical properties of the coarse fraction of the till (0.4 to 20 cm) and the surface boulders have been studied at two different sites in Sweden. The research work included: development of a new image analysis software for 3D size and shape measurements of particles; lithological analysis on multiple size fractions in till and magnetic susceptibility survey on coarse till clasts, surface boulders and local bedrock.

The new 3D image analysis method provides an enormous amount of size and shape data for each particle in the coarse fraction (2 to 20 cm) in till. The method is suitable for field study, cost effective and the software is executable in Matlab. The field imaging method together with the image analysis software give non subjective results of size and shape of coarse particles and makes it feasible and easy to study representative sample size, which is one tonne for testing clasts of size up to 20 cm.

The lithological analysis of the multiple size fraction of the till clasts has been investigated on six different size fractions of the till (0.4 to 20 cm); the result of the different samples from the two sites shows that this method can potentially be used as a stratigraphic tool in the areas where there is no unique indicator lithologies.

The magnetic susceptibility has been made on the surface boulders, the 6-20 cm till fraction and on insitu bedrock outcrops near to the study sites. The method has good potential for determining stratigraphic relationships between different till units as well as for determining the provenance ofcoarse clasts and surface boulders.

Place, publisher, year, edition, pages
Stockholm: KTH , 2010. , x, 43 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2047
Keyword [en]
Three-dimensional shape, Grain size, Till lithology, Natural aggregate, Till provenance, Magnetic susceptibility of rock, Physical property of till
National Category
Civil Engineering Geophysical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-11988ISBN: 978-91-7415-563-1 (print)OAI: oai:DiVA.org:kth-11988DiVA: diva2:292365
Presentation
2010-02-26, V77, Teknikringen 74, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20110413Available from: 2010-02-09 Created: 2010-02-05 Last updated: 2011-04-13Bibliographically approved
List of papers
1. Digital sieving-Matlab based 3-D image analysis
Open this publication in new window or tab >>Digital sieving-Matlab based 3-D image analysis
2012 (English)In: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 137-138, 74-84 p.Article in journal (Refereed) Published
Abstract [en]

A new image analysis technique for determining the three-dimensional size and shape distribution of coarse particles has been developed. It entails acquiring a pair of images, one each of the maximum and minimum projected area of the particles. Glow-In-the-Dark beads were used to create luminous background, thus it is named the GID method. In this study the size and shape distribution of four coarse-grained samples, size varies from 2 to 20. cm, have been analyzed. The size distribution of the samples obtained from the GID analysis is comparable to sieve analysis results, and has an extra advantage of being applicable in the field. The algorithm was developed in Matlab; therefore users could make some optimization in the program to meet their own needs as the program code is open source.

Keyword
Digital sieving, Image analysis, Particle form, Particle size, Shape distribution
National Category
Civil Engineering Geophysical Engineering
Identifiers
urn:nbn:se:kth:diva-32361 (URN)10.1016/j.enggeo.2012.04.001 (DOI)000304745500008 ()2-s2.0-84860130845 (Scopus ID)
Funder
Formas
Note
QC 20120611. Updated from submitted to published.Available from: 2011-04-13 Created: 2011-04-13 Last updated: 2017-12-11Bibliographically approved
2. Lithological analysis of multiple size fractions of till
Open this publication in new window or tab >>Lithological analysis of multiple size fractions of till
(English)Article in journal (Other academic) Submitted
Keyword
clast lithology, stratigraphic tool, gravel analysis, size distribution, particle form
National Category
Geophysical Engineering Civil Engineering
Identifiers
urn:nbn:se:kth:diva-32362 (URN)
Note
QS 20120326Available from: 2011-04-13 Created: 2011-04-13 Last updated: 2012-03-26Bibliographically approved

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