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Incision and channel morphology across active structures along the Peikang River, central Taiwan; implications for the importance of channel width

Brian J. Yanites, Gregory E. Tucker, Karl J. Mueller, Yue-Gau Chen, Tarka Wilcox, Shao-Yi Huang and Kuo-Wei Shi
Incision and channel morphology across active structures along the Peikang River, central Taiwan; implications for the importance of channel width
Geological Society of America Bulletin (July 2010) 122 (7-8): 1192-1208

Abstract

River morphology and dynamics are strongly influenced by active tectonics. We report channel dynamics for the Peikang River, which flows through the Hsuehshan Range in central Taiwan. Using a digital elevation model and field surveys, we constrain channel morphology for an approximately 90 km stretch of river to calculate unit stream power and boundary shear stress along the river path. Incision rates are estimated with optically stimulated luminescence dating of sand deposited on strath terraces. We find a strong correlation between unit stream power/shear stress and incision rate, but only if variation in channel width is considered. A calibrated river incision rule implies river incision rates of approximately 9-13.5 mm/yr upstream of the Meiyuan and Tili faults and suggests that one or both of these structures are presently active. Our results indicate that the Shuilikeng fault is also actively deforming, as incision rates increase to approximately 6-10 mm/yr across it, compared to 1-4 mm/yr in adjacent reaches. Prominent narrowing across the Shuilikeng fault, and the absence of significant gradient variation indicate that channel width is a first-order morphological adjustment to differential incision. Only when the channel width-to-depth ratio reaches a minimum does the channel slope significantly adjust to local changes in base level, as is the case upstream of the Meiyuan and Tili faults.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 122
Serial Issue: 7-8
Title: Incision and channel morphology across active structures along the Peikang River, central Taiwan; implications for the importance of channel width
Affiliation: University of Colorado, Department of Geological Sciences, Boulder, CO, United States
Pages: 1192-1208
Published: 201007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 62
Accession Number: 2010-050194
Categories: GeomorphologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2010054
Illustration Description: illus. incl. sects., 2 tables, sketch maps
N23°36'00" - N23°36'00", E120°17'60" - E120°17'60"
Secondary Affiliation: National Taiwan University, TWN, Taiwan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201027
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