The Influence of Water Level Fluctuation on Reservoir Delta Morphodynamics: Experiment and Field Measurement
Date Issued
2010
Date
2010
Author(s)
Liu, Heng-Hsin
Abstract
In this thesis, field measurements and laboratory experiments are performed to investigate the relationship between water level variations and delta morphodynamics. To understand this relationship, we selected Wushe Reservoir for a field case study. For this reservoir, subject to rapid sedimentation, Taiwan Power Company agreed to provide data and grant access for us to measure subaerial and subaqueous deltaic profiles at two different times. Based on the field data, we then conducted laboratory experiment with a wide flume, a changing water level, mixed coarse and fine sand, and a camera and laser system monitoring the experimental process and evolving morphology. Both in the field and in the experiments, we observed the formation of multiple terrace levels, banklines retreat due to migrating channels, and the deposition of interbedded coarse and fine layers. As the water level changes, subaqueous deposits become subaerial and vice versa. Moreover, some hyperpycnal deposits may be preserved within side terraces over at least one cycle of lake filling and emptying. During falling water stage, the river channel incises the topset bed and aliments a prograding subaqueous delta lobe. Unlike in the field, these processes can be monitored continuously in the laboratory experiments.
Subjects
delta
Wushe Reservoir
field survey
water level fluctuation
topset
foreset
terrace
laboratory experiment
Type
thesis
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