Experimental Formula for the Hydraulic Erosion Rate and Numerical Applications of Soft Bedrock Channels
Publication: Journal of Hydraulic Engineering
Volume 148, Issue 10
Abstract
In this research, laboratory experiments and numerical models were used to develop a new formula for the hydraulic scour rate and a bedrock module for estimating soft bedrock erosion rate, and they were then applied in a study of the Zhuoshui River in Central Taiwan. From laboratory experiments, the relationship between the critical shear stress and hydraulic scour rate with the dominant bedrock property (uniaxial compressive strength) was established. For the soft bedrock module, only one parameter (i.e., the rock erodibility coefficient ) was calibrated once the bedrock properties were known. An unsteady two-dimensional depth-averaged numerical model incorporating the new formula for hydraulic scour rate and the bedrock module was developed. After calibration and validation, the developed model well reproduced soft bedrock erosion during high-flow periods in this study reach. The simulation results showed that hydraulic scour is dominant in the upstream reach, while abrasive scour accounted for 65%–80% of the total erosion in the downstream reach. In addition, more bedrock erosion was observed at the locations with greater contributions from abrasive scour.
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Data Availability Statement
All data, models, and code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work was financially supported by the Ministry of Science and Technology of Taiwan (Grant No. MOST 103-2221-E-009-155-MY3) and Zhejiang Provincial Natural Science Foundation of China (LY20A020009). The authors appreciate the support of the Water Resources Planning Institute of Water Resources Agency in Taichung, Taiwan, who provided the hydrometric, sediment, and bathymetry data used in the study. In addition, the authors would like to thank Pei-Heng Chung and Shao-Chien Ho who assisted with the experimental preparations, operations, and data collection.
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Published In
Journal of Hydraulic Engineering
Volume 148 • Issue 10 • October 2022
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© 2022 American Society of Civil Engineers.
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Received: Jul 9, 2020
Accepted: Jan 29, 2022
Published online: Jul 28, 2022
Published in print: Oct 1, 2022
Discussion open until: Dec 28, 2022
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