Biomechanical Simulations and Wind Tunnel Experiments of Crop Lodging Risk
Date Issued
2004
Date
2004
Author(s)
Chung, Chai-Hsing
DOI
zh-TW
Abstract
The major objective of the study is to perform biomechanical simulations and wind tunnel experiments of rice lodging. The dynamic behaviors and lodging risks of rice in high winds are investigated. Firstly, a biomechanical model, based on a two-mass system for herbaceous plants (Baker, 1995), is developed. The model enables us to study the possible plant failure modes, such as stem failure, root failure and uprooting, which cannot be predicted by the commonly used cantilever beam system. The study further includes the Monte Carlo concept into the biomechanical model to assess rice lodging risk for various wind speeds, wind blowing times, and rice living periods. Finally, a wind tunnel experiment is carried out to measure the lodging risk and the physical properties of rice. The wind tunnel results are also used to verify the simulated results of the biomechanical model and to identify the relative importance of the parameters in the model. All of the wind tunnel results and the simulated results indicate that rice failure occurs at stem bottom. Root failure is not easy to take place in high winds because of the high root strength. The most important factors that affect lodging probability are ear area and stem radius. The results of the biomechanical simulations and wind tunnel experiments can be used to establish the information library of the Taiwan local plants and further to evaluate rice lodging risks and yield losses during Typhoon periods.
Subjects
風洞試驗
強風
水稻
倒伏
植物破壞
Lodging
Plant failure
High winds
Wind tunnel
Rice
Type
thesis
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