本研究以實驗觀測表面波通過潛沒溝渠內具有密度分層流體時所生成的內波，此種情況主要發生於港口、航道以及出海口處，內波的產生對於船隻航行於航道以及表面波之衰減皆有所影響。故本文經由影像之擷取以及影像處理技巧，檢視表面波與內波之運動現象。
本文使用黑糖水與淡水模擬溝渠內之密度分層流體，並規劃不同之黑糖水密度、厚度與由低頻至高頻的規則波作為不同的試驗條件，以觀察在不同的表面波頻率與溝渠自然頻率所造成的內波反應。應用攝影機與影像處理技術，本研究可同時擷取表面波與內波的時空演化，此技術改善了以往單點量測的困擾以及因儀器同步所造成的相位誤差。經由分析結果觀察到兩種不同型態之內波；單峰震盪一般發生在密度差較大時；而多峰震盪(駐波)則在密度差較小時較易發生。此外，於實驗與分析中亦觀察到因糖水之黏滯性而造成表面波與內波之相位差。

The generation of internal waves are investigated experimentally as water waves propagate across a submarine trench which is partially filled with heavier fluid. Such cases mainly occurred in the harbor, waterway and estuary. The occurrence of internal wave influences the ships sailing in the channel and also the attenuation of the surface wave. By using the technique of image capturing and digital image processing, we survey the movement of surface wave and internal wave.
The use of brown sugar water and fresh water are simulated the density-stratified fluid in rectangular trench in wave flume. And the test condition is formulated including different density and layer thickness of brown sugar water and the frequency from low to high of the regular wave. The application of image processing technique gives a clear insight into the surface wave and internal wave. This technique has improved single point of measurement in the past and because of equipment problems caused by the phase error simultaneously. The two different type internal wave are observed from the experiments. It is the traveling internal waves usually happen when the density of lower fluid was high, and standing internal waves usually occurred when the density of lower fluid was low. In addition, the phase lag between surface wave and internal wave caused by the viscosity of the brown sugar water is also observed in experiments.

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