Laboratory Study on Erosion of Vegetated HPTRM System under High-Speed Open-Channel Flow
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144, Issue 1
Abstract
High-performance turf reinforcement mat (HPTRM) is a technology to strengthen the vegetation lining and enhance its anti-erosion capability. Existing studies on the erosion resistance of vegetated HPTRM systems are mainly based on large-scale tests and focus on permissible flow velocity and shear stress. In this study, a specially designed flume was used to generate high-speed open-channel flow and investigate the erosion process of a vegetated HPTRM system. In total, 48 samples of natural vegetation and three types of vegetated HPTRM systems were cultivated and tested under different slopes and discharges. Both continuous and discontinuous tests were conducted. During the tests, erosion depths, flow discharges, and flow velocities were recorded. The difference between the erosion rates of continuous and discontinuous tests indicates that the first flushing of the flow induced most of the erosion of the vegetated HPTRM system. The erosion processes of the samples displayed a decrease in erosion rate with an increase in erosion depth, which can be explained by the exposure of HPTRM and consequent increase of anti-erosion capability. The influences of flow discharge and the structure of the HPTRM on the erosion process we also investigated.
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Acknowledgments
The authors sincerely thank the supports from the National Key R&D Program of China (2016YFC0401500), the National Natural Science Foundation of China (51309092), the Natural Science Fund for Colleges and Universities in Jiangsu Province (BK20130833), and the Fundamental Research Funds for the Central Universities (2015B16014). In addition, this study was partially supported by Bonar NV and Xiamen Renxiang Investment Co., Ltd. The samples of the vegetated HPTRM system were cultivated with the help of technicians from Xiamen Renxiang Investment Co., Ltd. Thanks are also extended to Datong Wang, Guanqing Zhang, Qiang Wang, Qian Wang, Shengzhuo Xu, Zhuang Zhang, and Zhiyuan Su for their support during the experiments. Thanks are also expressed to two anonymous reviewers for their work. The reviewers’ comments were very helpful in improving this manuscript.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144 • Issue 1 • January 2018
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© 2017 American Society of Civil Engineers.
History
Received: Nov 29, 2016
Accepted: Jul 24, 2017
Published online: Nov 2, 2017
Published in print: Jan 1, 2018
Discussion open until: Apr 2, 2018
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