本研究針對波浪未發生碎波之前提下，嘗試在試驗海床上增設一矩形潛體模型進行量測規則波通過單一潛體時所引致之液化砂質海床之行為變化，研究重點在於海床液化時之砂面時序列變化與潛體周圍相關特性變化之探討。
　　應用紅外線砂面測定儀量測堤前5 cm處的砂面時序列變化並於每一試次試驗後量測潛體周圍地形變化，配合潛體下方土槽內部不同深度之孔隙水壓，反應土壤內部之反應。於潛體堤前5 cm處架設一支超音波式Doppler流速儀以量測近底床1 cm處流速之變化。潛體堤頂正上方及其前後水面處則分別架設波高計以量測波浪通過潛體前後之水面波形變化及推求反射率。且在潛體堤前與堤後5 cm 及10 cm處架設距離底床上方1 cm 之光學式濃度計以量測漂砂濃度值及其漂砂方向。試驗波浪條件為規則波浪包括單頻規則波浪與規則波群兩種。
　　綜合試驗結果得到海床砂面在非液化反應時，呈現一水平直線無起伏的變化，而在海床砂面有液化反應時，則會與同斷面上的水面波形做相似週期的振動行為；且從單頻波浪的試驗中得知，隨著液化深度越深，海床砂面的最大振幅越大。相對於海床砂面的變化，在試驗土槽上方的水面波形，則會有振幅縮小的現象，且離潛體較近的水面波形，振幅縮小的幅度較大。懸浮漂砂濃度在海床土壤發生液化反應時，在堤前部分會有明顯的抬升，而在堤後的部份則是受潛體的影響，濃度抬升值不若堤前。

　　In this experimental study, a rectangular submerged obstacle was added on the test seabed for measuring behaviors of a fluidized sandy bed surface. It is particularly aimed at studying time series of motions of a fluidized bed surface and the results of scours of foundation soil in the front and lee sides of a submerged obstacle.
　　The instrumentation consists of a infrared optical altimetry for measuring the time series of a near fluidized-bed surface motions 5 cm in front of the obstacle and scour depth distributions around the obstacle. Six Pore pressure transducers were installed inside the foundation bed soils to display typical seabed responses. A 3D acoustic Doppler velocimetry was adopted to measure velocity fields in front of the obstacle at 1 cm above the bed. Six wave gauges were adopted to collect wave transformations on both sides of the obstacle. Four optical sediment-concentration probes at 1 cm above the bed were used for studying sediment transport. Two types of waves, i.e. monochromatic waves and regular wave groups, were generated in present laboratory flume tests.
　　The results illustrate that no surface motions were found from an unfluidized bed. However, relatively significant motions with the same frequency of over-loading waves started to occur after a bed had been fluidized. The amplifications of bed-surface oscillation grew larger as thickness of fluidized soil layers increased. Meanwhile during a fluidized response, wave heights over the fluidized bed relative to those entering the soil basin were clearly found to decrease by about ?% to ?%, especially getting closer to the obstacle. Similarly, the suspended sediment concentrations increased more significantly in the front than in the lee of the obstacle after the occurrence of foundation fluidization.

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