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A platform for research: civil engineering, architecture and urbanism
Post‐Regulation Morphological Change on Peace River
Abstract: Morphological changes following the 1967 regulation of Peace River have been studied by making maps, at approximately decennial intervals, of five reaches, totaling 763 km (about 62% of the river course below the dams). The adjustment to regulation has largely been passive, consisting of narrowing of the “active channel” within its former confines. The “channel zone,” which includes vegetated bars and islands within the outer channel boundaries, has narrowed to a lesser degree. The upper river is no longer competent to carry the bed material sediment load introduced by the tributaries so that aggradation is occurring below the principal tributary junctions. In the lower river, general aggradation is occurring immediately below the gravel sand transition. In the British Columbia reach of the river, channel narrowing consists of the abandonment of secondary channels and vegetation progradation onto exposed bars no longer seasonally inundated. In the confined Reach AB1, change is modest except in two areas of extensive anastomosis. Reach AB2 has not narrowed at all: In this reach ice activity is maintaining the channel in its former dimensions, including back channels that are often the avenue for ice‐dammed water to escape, providing evidence that ice can maintain oversize channels. In the sand‐bed Reach AB3, siltation of back channels is significant while in the distal Reach AB4, exposure of river bars represents the principal change to date, which may later issue in increased anastomosis. Overall, changes have increased the resistance to flow along the river. Continuing change will be paced mainly by the rate of progradation of riparian vegetation, hence will require many decades to be completed.
Post‐Regulation Morphological Change on Peace River
Abstract: Morphological changes following the 1967 regulation of Peace River have been studied by making maps, at approximately decennial intervals, of five reaches, totaling 763 km (about 62% of the river course below the dams). The adjustment to regulation has largely been passive, consisting of narrowing of the “active channel” within its former confines. The “channel zone,” which includes vegetated bars and islands within the outer channel boundaries, has narrowed to a lesser degree. The upper river is no longer competent to carry the bed material sediment load introduced by the tributaries so that aggradation is occurring below the principal tributary junctions. In the lower river, general aggradation is occurring immediately below the gravel sand transition. In the British Columbia reach of the river, channel narrowing consists of the abandonment of secondary channels and vegetation progradation onto exposed bars no longer seasonally inundated. In the confined Reach AB1, change is modest except in two areas of extensive anastomosis. Reach AB2 has not narrowed at all: In this reach ice activity is maintaining the channel in its former dimensions, including back channels that are often the avenue for ice‐dammed water to escape, providing evidence that ice can maintain oversize channels. In the sand‐bed Reach AB3, siltation of back channels is significant while in the distal Reach AB4, exposure of river bars represents the principal change to date, which may later issue in increased anastomosis. Overall, changes have increased the resistance to flow along the river. Continuing change will be paced mainly by the rate of progradation of riparian vegetation, hence will require many decades to be completed.
Post‐Regulation Morphological Change on Peace River
Church, Michael (editor) / Church, Michael (author) / Xu, Jiongxin (author)
The Regulation of Peace River ; 141-174
2014-12-03
34 pages
Article/Chapter (Book)
Electronic Resource
English
| Wiley | 2014
The regulation of Peace River : a case study for river management
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Tributary Channel Gradation Due to Regulation of Peace River
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| Engineering Index Backfile | 1964