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Title: ニュージーランド北島ルアペフ火山の火山湖決壊によって発生したラハール
Other Titles: Ruapehu Crater Lake break-out lahar, North Island, New Zealand
Authors: Manville, Vern Browse this author
Graham, Leonard Browse this author
Noel, Trustrum Browse this author
丸谷, 知己4 Browse this author →KAKEN DB
山田, 孝5 Browse this author
木村, 正信6 Browse this author
眞板, 秀二7 Browse this author
Authors(alt): Marutani, Tomomi4
Yamada, Takashi5
Kimura, Masanobu6
Maita, Hideji7
Keywords: lahar (volcanic mudflow)
Crater Lake break-out
hyper-concentrated flow
automatic lahar measuring equipment
automatic monitoring camera
Issue Date: Feb-2007
Publisher: 砂防学会
Journal Title: 砂防学会誌
Volume: 60
Issue: 2
Start Page: 59
End Page: 65
Publisher DOI: 10.11475/sabo1973.60.2_59
Abstract: On 18 March 2007 the summit Crater Lake of Mt. Ruapehu, New Zealand, breached a barrier of tephra emplaced by eruptions in 1995-96, resulting in the rapid release of 1.3 million m3 of water. The flood rapidly bulked by entraining snow, ice, rock debris and alluvium along the steep gorge of the upper Whangaehu River to form a debris flow that then transformed downstream into a hyper-concentrated and then sediment-laden stream flow during its passage to the Tasman Sea 155 km away. No lives were lost and infrastructural damage was minimal due to a comprehensive warning system developed in the decade before the lahar. A previous break-out lahar in 1953 caused a railway disaster at Tangiwai with the loss of 151 lives. The lahar flowed as a multi-peaked debris flow in the Whangaehu gorge, 7 km downstream of Crater Lake. Automatic lahar measuring equipment, including water level gauges, flow velocity sensors, conductivity samplers and seismographs were installed at key sites along the flow path, and were supplemented by sequential photographs captured by automatic monitoring cameras and observer teams. Flow velocity averaged 30 km/hr and water level rose by 8.2 m in 4 minutes in the gorge. The lahar caused riverbed aggradation in many places and environmental disturbance to the channel regime.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 丸谷 知己

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