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Origin of a Circular Morphological Form in Lolan Valley, Khwakoork Area, North Iraq
Iraq Geological Survey, Baghdad.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6790-2653
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
2016 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 6, no 3, 121-132 p.Article in journal (Refereed) Published
Abstract [en]

The northern and north-eastern parts of Iraq are mountainous area with very rugged topography that includes high and steep cliffs, deep valleys; locally canyon shape, and rare wide and flat plains. The main exposed rocks over all the area are the carbonates, especially limestone and dolostone of different varieties. Tens of geological formations consist of very think limestones and/ or dolostone.This article deals with the origin of a circular form developed in one of the main valleys called Lolan Valley in Khwakurk area, northern part of Iraq. Different geomorphological, lithological, structural and stratigraphical indications are used to conclude the origin of the circular form, which is confirmed to be a sinkhole due to karstification of thick carbonate rocks.The outer diameter of the circular form is 386 m; the width of the valley ranges from (35 – 150) m, the length of the circular form is 1045 m, which means the length to valley width ration is 20.9 times, the ratio of the radius to the width is 4 times. These two ratios are other indications that the meander of Lolan valley is not a normal meander, but a meander formed due to the collapse of existed sinkhole alongside the valley.

Place, publisher, year, edition, pages
2016. Vol. 6, no 3, 121-132 p.
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-11593Local ID: a9940104-67af-44e9-9d14-dc7b1a2bee1dOAI: oai:DiVA.org:ltu-11593DiVA: diva2:984543
Note
Validerad; 2016; Nivå 1; 20160520 (nadhir)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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