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Title: The Role of Catastrophic Floods Generated by Collapse of Natural Dams Since the Neolithic in the Oases of Bukhara and Qaraqöl: Preliminary Results
Authors: Fouache, Eric 
Rachid Ragala 
Djamal Mirzaakhmedov 
Malvina Dupays 
Zink, Antoine 
Brunet, Frédérique 
Rante, Rocco 
Vella, Claude 
Porto, Elisa 
Fleury, Jules 
Andrieu-Ponnel, Valerie 
Cez, Lucie 
Keywords: OSL dating; Uzbekistan; fluvial geomorphology; geoarchaeology; geohazard; tributary migration
Issue Date: 2016
Journal: International Journal of Geohazards and Environment 
Abstract: The history of the civilizations of the oases of Bukhara and Qaraqöl (south-eastern Uzbekistan) since the Neolithic in relation to environmental changes is studied by the French/Uzbekistan Archaeological Mission in Bukhara 1 following pioneering Russian studies 2 . Using a methodology tested in Afghanistan, the geoarchaeological side of the program focused on the drawing of a regional geomorphological map then on the identification, mapping and dating of the paleochannels of the river Zerafshan. We established the chronology of several generations of fluvial channels in relation to archaeological settlements of different eras (Early Neolithic, Neolithic, Bronze Age, Iron Age and Islamic period) and with optically stimulated luminescence dating of alluvial deposits. Based on preliminary results of these OSL dates we propose and discuss a regional environmental reconstruction. We hypothesize that the main cause of avulsion could be catastrophic floods generated by collapse of natural dams in the upper part of the Zerafshan River.
ISSN: 2368-5905
DOI: 10.15273/ijge.2016.03.015
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