本研究採用一細砂質 ( d50 =0.078mm ) 土壤作為試驗砂床材料，於1m寬之斷面水槽中，以一系列不規則波進行試驗。試驗之目的為探討在特定波譜下海床孔隙水壓及土壤液化反應與懸浮漂砂濃度剖面之關聯性。試驗時於近砂床上方等間距架設五支光學式濃度計量測懸浮漂砂濃度，並於其下砂床內部架設五支孔隙水壓計，同時量測土壤反應。由孔隙水壓力量測結果顯示，細砂質土壤在不規則波浪作用下也有非液化、起始液化及連續液化三種反應。一般而言，砂床液化機制主要之決定因素為土壤滲透性。土壤滲透性越小越可能於第一次造波時，即產生液化現象。從其多階段之抬升現象可以清楚的看出，不規則波與簡諧波皆有相同之特性，即易使土壤液化層更深入砂床，可看出液化是由表層往底層深入。從同步懸浮漂砂濃度量測之結果顯示，在砂床土壤產生液化後，砂床面上各高度之濃度值有明顯上升現象。尤其是在起始液化時砂床上方 1cm 處最為明顯。最後本研究建議，應進一步用現場的波浪資料模擬進行造波試驗，並與現場所量得的懸浮漂砂資料作比較。

　　In this thesis, a fine sandy seabed ( d50 = 0.078 mm ) in laboratory water tankis used to investigate the relationships between soil fluidization responses and overall suspended sediment concentration profiles induced by Irregular waves on the firm spectrum. In the experimental setup, five optical sediment concentration probes with equal vertical intervals above a sandy bed and five pore pressure transducers inside the sandbed are installed for simultaneous measurements. The pressure responses show that, under irregular waves, the sandy seabeds display also typical responses such as unfluidized, initially fluidized and continuously fluidized, respectively. In addition, a resonance mechanism can be identified on initially fluidized responses, closely associated with the permeability of the soils. Monochromatic wave and irregular waves show the same tendency that fluidization goes into the seabed, from the seabed surface. During the fluidization, our measurements show that the suspended sediment concentration increases significantly, especially at about 1 centimeter above the seabed. It is suggested that experiments under irregular waves of fields on fluidization and comparisons with the concentration and pressure in the fields.

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