Abstract
Due to vegetation drag and vegetation-generated turbulence, bedload transport in vegetated channels is more complicated than that in nonvegetated channels. It is challenging to obtain accurate predictions of bedload transport in vegetated channels. Previous studies generally used rigid circular cylinders to simulate vegetation, and the impact of plant morphology on bedload transport was typically ignored; these methods deviate from natural scenarios, resulting in prediction errors in transport rates of more than an order of magnitude. This study measured bedload transport rates inside P. australis, A. calamus and T. latifolia canopies and in arrays of rigid cylinders for comparison. The impact of plant morphology on bedload transport in vegetated channels was examined. Inside the canopies of natural morphology, the primary factor driving bedload transport is the near-bed turbulent kinetic energy (TKE), which consists of both bed-generated and vegetation-generated turbulence. A method was proposed to predict the near-bed TKE inside canopies with natural morphology. For the same solid volume fraction of plants, the transport rate inside canopies with a natural morphology is greater than or equal to that within an array of rigid cylinders, depending on the plant shape. This finding indicates that plant morphology has a significant impact on transport rates in vegetated regions and cannot be ignored, which is typical in practice. Four classic bedload transport equations (the Meyer-Peter-Müller, Einstein, Engelund and Dou equations), which are suitable for bare channels (no vegetation), were modified in terms of the near-bed TKE. The predicted near-bed TKE was inserted into these four equations to predict the transport rate in canopies with natural morphology. A comparison of the predictions indicated that the Meyer-Peter-Müller equation had the highest accuracy in predicting the transport rate in vegetated landscapes.
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Acknowledgment
This work was supported by the Fundamental Research Project of China Yangtze Power Co., Ltd. (Grant No. 2423020045).
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Conflict of interest: The authors declare that they have no conflict of interest. Chao Liu is editorial board member for the Journal of Hydrodynamics and was not involved in the editorial review, or the decision to publish this article. All authors declare that there are no other competing interests.
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Project supported by the National Key Research and Development Program of China (Grant No. 2022YFE0128200), the National Natural Science Foundation of China (Grant Nos. 52379072, 52022063).
Biography: Li He (1998-), Male, Master Candidate
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He, L., Shan, Yq., Liu, C. et al. Prediction of bedload transport inside vegetation canopies with natural morphology. J Hydrodyn 36, 556–569 (2024). https://doi.org/10.1007/s42241-024-0033-7
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DOI: https://doi.org/10.1007/s42241-024-0033-7