Confluence morphodynamics with tributary influx and Lake Formation: field survey and experiments
Date Issued
2011
Date
2011
Author(s)
Cheng, Ho-Yu
Abstract
This thesis uses field survey and laboratory experiments to investigate the relationship between tributary debris flows and tributary dammed lakes at the confluence of trunk rivers with tributaries. Specifically, the focus is on the confluence of the Laonong River with its Putanpunas tributary, where debris-dammed lakes have been observed in 2007 and 2011. During typhoon Morakot, 2009, tributary sediment supply to the Laonong River resulted in aggradation. In 2011, the Putanpunas continued to provide sediment, causing a tributary dammed lake. We used several field survey methods to understand landform variation. In laboratory we used experiment to simulate field situation. Experiment included one-dimensional and two-dimensional. One dimensional experiment simulated large area variation and two dimensional experiment simulated local morphology evolution. In the experiments, we can observe the tributary dammed lake growth process. Many phenomena in the experiments can be compared with field features. The results show that tributary debris flows have a significant influence on trunk river profile and morphology.
Subjects
debris flow
tributary dammed lake
Laonong Rievr
Putanpunas River
typhoon Morakot
aggradation
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-100-R98521305-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):9342dbc972e643bd8e8aa954278037c3