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The History, Hydraulics, and Geomorp...

Turzewski, Michael D.

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The History, Hydraulics, and Geomorphic Impact of Outburst Floods in the Eastern Himalaya.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The History, Hydraulics, and Geomorphic Impact of Outburst Floods in the Eastern Himalaya./
作者:	Turzewski, Michael D.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	166 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-08, Section: B.
Contained By:	Dissertations Abstracts International81-08B.
標題:	Geology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22618345
ISBN:	9781658406079

The History, Hydraulics, and Geomorphic Impact of Outburst Floods in the Eastern Himalaya.
Turzewski, Michael D.

The History, Hydraulics, and Geomorphic Impact of Outburst Floods in the Eastern Himalaya. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 166 p.

Source: Dissertations Abstracts International, Volume: 81-08, Section: B.

Thesis (Ph.D.)--University of Washington, 2019.

This item must not be sold to any third party vendors.

Outburst floods have shaped many landscapes on Earth and represent a significant geologic hazard, but they are relatively infrequent, and we must rely on the sedimentary record to study the most extreme events that have occurred. The eastern Himalaya has a record of various magnitude outburst flood events, including landslide-dam outburst floods (>10.

ISBN: 9781658406079Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

GeoClaw

The History, Hydraulics, and Geomorphic Impact of Outburst Floods in the Eastern Himalaya.
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245 1 4 $a The History, Hydraulics, and Geomorphic Impact of Outburst Floods in the Eastern Himalaya.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 166 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-08, Section: B.
500 $a Includes supplementary digital materials.
500 $a Advisor: Huntington, Katharine W.
502 $a Thesis (Ph.D.)--University of Washington, 2019.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Outburst floods have shaped many landscapes on Earth and represent a significant geologic hazard, but they are relatively infrequent, and we must rely on the sedimentary record to study the most extreme events that have occurred. The eastern Himalaya has a record of various magnitude outburst flood events, including landslide-dam outburst floods (>10.
520 $a 5 m.
520 $a 3/s) and ancient glacial-outburst megafloods (>10.
520 $a 6 m.
520 $a 3/s) that have done substantial amounts of geomorphic work on the landscape throughout the Quaternary. This dissertation investigates outburst floods in the eastern Himalaya with a combination of fieldwork, remote sensing, numerical flood modeling, and geochronology to study the timing, hydraulics, and net erosional impact of these events. Numerical flood simulations of the year 2000 Yigong River outburst flood help characterize flood hazard in the Siang River valley, India, and are used to examine the relationship between outburst flood hydraulics and geomorphic change observed along the >450 km rugged flood pathway that cuts through the >2 km deep Tsangpo Gorge. Simulated outburst flood hydraulics differ from non-flood flows and show that valley topography exerts a strong control on the distribution of shear stress and the patterns of erosion and deposition produced from the flood. Zircons collected from ancient slackwater flood deposits in the region characterize the age of rocks eroded from flood source terrains in Tibet and from the Tsangpo Gorge. Statistical analyses of these data support the previous hypothesis that megafloods erode more rock from Gorge compared to smaller flows, but also show substantial variability among different megaflood deposit samples. These data suggest that megafloods rework sediments from previous events, which is a result supported by luminescence age data from megaflood deposits that influences the interpretation of detrital outburst flood samples. Radiocarbon and luminescence dating methods constrain the timing of at least 9 megaflood events over the last 42 ka, showing the potential for repeated megaflood events from glacial-lake sources in Tibet. The work presented here advances our knowledge about hydraulics during outburst floods, patterns of preferential erosion, chronology of megafloods, and processes of sediment reworking, altogether improving our understanding of the impact of extreme outburst floods in the region.
590 $a School code: 0250.
650 4 $a Geology. $3 516570
650 4 $a Geomorphology. $3 542703
650 4 $a Sedimentary geology. $3 3173828
653 $a GeoClaw
653 $a Himalayas
653 $a Luminescence
653 $a Megafloods
653 $a Zircon
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690 $a 0484
690 $a 0594
710 2 $a University of Washington. $b Earth and Space Sciences. $3 2097740
773 0 $t Dissertations Abstracts International $g 81-08B.
790 $a 0250
791 $a Ph.D.
792 $a 2019
793 $a English
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