Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada
Abstract The first known occurrence of outburst flooding at Ape Lake, British Columbia, was in October 1984 following the formation of a subglacial tunnel in an ice dam created by Fyles Glacier. Following tunnel closure, the lake refilled in 150 d and then a second outburst flood occurred in August...
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Cambridge University Press (CUP)
1989
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Online Access: | http://dx.doi.org/10.1017/s0022143000009278 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000009278 |
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crcambridgeupr:10.1017/s0022143000009278 2024-03-03T08:46:02+00:00 Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada Desloges, Joseph R. Jones, David P. Ricker, Karl E. 1989 http://dx.doi.org/10.1017/s0022143000009278 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000009278 en eng Cambridge University Press (CUP) Journal of Glaciology volume 35, issue 121, page 349-354 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1989 crcambridgeupr https://doi.org/10.1017/s0022143000009278 2024-02-08T08:42:50Z Abstract The first known occurrence of outburst flooding at Ape Lake, British Columbia, was in October 1984 following the formation of a subglacial tunnel in an ice dam created by Fyles Glacier. Following tunnel closure, the lake refilled in 150 d and then a second outburst flood occurred in August 1986. During both events, 55% of the Apc Lake volume or 46 × 10 6 m 3 was released in less than 24 h into the 50 km long, ungauged Noeick River, producing an average discharge of 540 m 3 s −1 . Channel and flood-plain erosion, damage to access roads, bridges, a logging camp, and an airstrip were related to the peak or maximum instantaneous discharge. In the absence of direct measurements, and to facilitate planning for future flood events, several independent methods were employed to estimate peak discharge. A modified version of the Clague-Mathews formula and the slope-area method yield consistent estimates which approach 1600 m 3 s −1 near the ice-dam outlet. Attenuation of the flood peak in Noeick River is as high as 25% in the upper 12 km due to channel and flood-plain storage. Results using Clarke’s (1982) physical-based model suggest lower discharges and may be related to the irregular morphology of Ape Lake. Since Fyles Glacier is in continuous retreat, drainage around the margin of the ice dam which began in the summer of 1987 is expected to continue and no further outburst floods are anticipated. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Canada British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Journal of Glaciology 35 121 349 354 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Desloges, Joseph R. Jones, David P. Ricker, Karl E. Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada |
topic_facet |
Earth-Surface Processes |
description |
Abstract The first known occurrence of outburst flooding at Ape Lake, British Columbia, was in October 1984 following the formation of a subglacial tunnel in an ice dam created by Fyles Glacier. Following tunnel closure, the lake refilled in 150 d and then a second outburst flood occurred in August 1986. During both events, 55% of the Apc Lake volume or 46 × 10 6 m 3 was released in less than 24 h into the 50 km long, ungauged Noeick River, producing an average discharge of 540 m 3 s −1 . Channel and flood-plain erosion, damage to access roads, bridges, a logging camp, and an airstrip were related to the peak or maximum instantaneous discharge. In the absence of direct measurements, and to facilitate planning for future flood events, several independent methods were employed to estimate peak discharge. A modified version of the Clague-Mathews formula and the slope-area method yield consistent estimates which approach 1600 m 3 s −1 near the ice-dam outlet. Attenuation of the flood peak in Noeick River is as high as 25% in the upper 12 km due to channel and flood-plain storage. Results using Clarke’s (1982) physical-based model suggest lower discharges and may be related to the irregular morphology of Ape Lake. Since Fyles Glacier is in continuous retreat, drainage around the margin of the ice dam which began in the summer of 1987 is expected to continue and no further outburst floods are anticipated. |
format |
Article in Journal/Newspaper |
author |
Desloges, Joseph R. Jones, David P. Ricker, Karl E. |
author_facet |
Desloges, Joseph R. Jones, David P. Ricker, Karl E. |
author_sort |
Desloges, Joseph R. |
title |
Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada |
title_short |
Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada |
title_full |
Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada |
title_fullStr |
Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada |
title_full_unstemmed |
Estimates of Peak Discharge from the Drainage of Ice-Dammed Ape Lake, British Columbia, Canada |
title_sort |
estimates of peak discharge from the drainage of ice-dammed ape lake, british columbia, canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
1989 |
url |
http://dx.doi.org/10.1017/s0022143000009278 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000009278 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
Canada British Columbia |
geographic_facet |
Canada British Columbia |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 35, issue 121, page 349-354 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000009278 |
container_title |
Journal of Glaciology |
container_volume |
35 |
container_issue |
121 |
container_start_page |
349 |
op_container_end_page |
354 |
_version_ |
1792501867655200768 |