在人造水利結構物的設計中，水躍為水利工程師必須考慮的重要現象之一。因其由超臨界流轉換至亞臨界流的流動特性，於設計中考慮此現象可避免下游結構物因高速流動而導致的侵蝕破壞。此研究利用實驗及數值模擬研究發展中水躍之內部流場及其現象。在本研究之實驗中，透過改變渠道傾角產生不同的入流福祿數，並利用高速攝影機記錄流動的發展過程後，以粒子影像測速法（Particle Image Velocimetry）進行速度場之量測。根據實驗提供之參數，此研究使用弱可壓縮移動粒子半隱式法（Weakly-Compressible Moving Particle Semi-Implicit method）嘗試去重現實驗中所觀測到的流動現象。經由實驗量測所得資料與數值模擬之結果比對後，兩者呈現相似的內部流動現象以及水面變化。此實驗希望透過影像測速法及無網格方法提供發展中之水躍的內部流場細節以及其流動現象。

The current study aims at the internal flow field and the corresponding phenomena in the developing stage of forced hydraulic jumps. It consists of experimental and numerical investigations. A series of experiments with various Froude number were performed by adjusting the inclination angle of the channel. A nonintrusive measuring technique, Particle Image Velocimetry (PIV), was applied in the experiments. Numerically, Weakly-Compressible Moving Particle Semi-implicit (WC-MPS) method coupled with the Sub-particle-scale turbulence model was employed to reproduce the flow phenomena. The simulation results for both flow surface profiles and velocity distributions at different sections were compared to the experimental data from the reference and the current study. Flow phenomena showed good agreement with the numerical simulation results. Finally, the results from both experiments and simulation provided a detailed examination of the flow field during the developing stages of forced hydraulic jumps.

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