Geomorphology and sedimentology of the lower delta plain and subaqueous delta plain of the Athabasca River Delta, N.E. Alberta

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dc.contributor.advisorSmith, Derald G.
dc.contributor.authorGorecki, Richard C.
dc.coverage.spatial200000253en
dc.date.accessioned2017-12-18T21:07:42Z
dc.date.available2017-12-18T21:07:42Z
dc.date.issued1990
dc.descriptionBibliography: p. 182-195.en
dc.description.abstractThe Athabasca lower delta plain and subaqueous delta plain (lower Athabasca Delta) are mainly a product of fluvial influence and a shallow receiving basin. The geomorphology of the lower Athabasca Delta reflects these conditions, and is characterized by bifurcating, low-sinuosity distributary channels, muddy interdistributary basins, distributary mouth bars and a gently sloping offshore profile. The major sandy bodies within the lower Athabasca Delta are the product of deposition within the distributary mouth bar, the crevasse-splay and the infilling distributary channel. Distributary mouth bars form thin (less than 4 m), lenticular bodies which tend to coalesce and produce a semi-continuous sandy sheet along the delta front. Crevasse-splays similarly form lenticular bodies of coarse material, however, they are smaller in scale than distributary mouth bars and tend not to merge laterally with each other. Distributary channel-fills tend to consist of very clean sands, and may exceed 5.5 m in thickness. They form a bifurcating to anastomosing network, and display a broad Ushaped cross-section which may be up to 600 m wide. Channel infilling occurs due to vertical aggradation as well as through the process of limited lateral accretion. Vertical aggradation is due to bedfonn migration along the channel thalweg, and produces a uniform sand sequence. Limited lateral accretion involves the process of step-wise bar formation, and occurs diagonally as opposed to strictly vertically or laterally. This style of infilling produces three types of vertical sequence: rhythmic sand, mud and heterolithic.
dc.format.extentxiii, 207 leaves : ill., + maps ; 30 cm.en
dc.identifier.citationGorecki, R. C. (1990). Geomorphology and sedimentology of the lower delta plain and subaqueous delta plain of the Athabasca River Delta, N.E. Alberta (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/409en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/409
dc.identifier.isbn031567007Xen
dc.identifier.lccGB 428.5 C3 G65 1990en
dc.identifier.urihttp://hdl.handle.net/1880/101410
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.lcshGeomorphology - Alberta - Athabasca River
dc.subject.lcshSedimentation and deposition - Alberta - Athabasca River
dc.subject.lcshDeltas - Alberta - Athabasca River
dc.titleGeomorphology and sedimentology of the lower delta plain and subaqueous delta plain of the Athabasca River Delta, N.E. Alberta
dc.typemaster thesis
thesis.degree.disciplineGeography
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameMaster of Science (MSc)
ucalgary.item.requestcopytrue
ucalgary.thesis.notesoffsiteen
ucalgary.thesis.uarcreleaseyen
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