本文係利用『台南七股段防風林地侵蝕防護工法探討』計畫中的實驗數據，探討柔性工法作用下，砂質底床上輸砂現象之初步研究。並利用量測的實驗資料，探討底床輸砂率與相關參數間的關係，以提供現場輸砂計算之參考。
　　本試驗係在砂質底床上，以沖竹樁作為固定架，佈置具有抑減波能之柔性材質作為滯砂設施。斷面佈置係根據七股海岸地形，以1/8之等比模型加以佈置，同時以25cm及37.5cm之大小波高，和3.1sec示性週期，分別拍打不同延時之不規則波。拍打波浪時，同步量測工法附近之波高與流速變化，待波浪拍打完畢，再量測斷面地形變化，直到地形達到平衡為止。
　　由試驗數據因次分析結果顯示，輸砂率q受水深h與流速U影響甚大，無因次輸砂率與徐爾玆數和流動勢能參數關係密切。本文在離岸10m~30m範圍內，藉由實驗量測的水深和流速值，求得每一延時之無因次輸砂率 和相對徐爾玆數及流動勢能參數之間關係。同時迴歸出關係式，並以SPSS統計軟體進行複迴歸運算，將其結果整理於附錄中，以提供現場應用上之參考。
　　本文同時探討輸砂率與最大輸砂率之比值與徐爾玆數和流動勢能參數之間關係。藉由實驗數據迴歸出關係式，以提供輸砂率計算之參考。最後將實驗數據於相同範圍內與Bagnold(1963)、Van Rijn(1984)、Madsen(1991)及Nielsen(1992)相關學者之經驗式作一比較，發現本實驗數據乃介於各學者經驗式之間。

　This study adopted the experiment data which were from the plan of「Protection Program for Erosion of Windbreak Forest Land at Chi-Gu Coast, Tainan」. This study was research the character of sediment transport with the experiment data by irregular wave under the flexible textile works. And with the experiment data to study the relation of sediment transport rate and correlated parameter for the application.
　A series of mobile seabed model test have been performed to study sand trapping effect and a preliminary study on sand transport by flexible textile works in the flume by the irregular wave. The layout is made with a model scale of 1/8. While a sequent of irregular waves were generated with two kinds of deep wave height (25cm,37.5cm) and wave period =3.1sec. In the meantime, the wave height and t velocity were be measured simultaneously in the vicinity of the flexible textile works. After wave generating, the section were be measured until the sea-bed in equilibrium.
　The result reveal that the rate of sediment transport shows a close relation with the water height and sea-bed current. And with the dimension analysis, we can also find that the dimensionless parameter of sediment transport rate shows a good relation with Shield number and mobility parameter .So with the experiment data, we can find out the relation of dimensionless sediment transport rate 、 Shield number and mobility parameter of every period time in the range of 10m~30m away from the shoreline. With the regression of experiment data and SPSS statistics software of multi-regression analysis, we can get the relation. And make up the result on the appendix to apply on a work spot.
　In this study, we also study the relation of the ratio of the sediment transport rate and maximum sediment transport rate . With the regression of experiment data, we can find the correlative formulas which were suggested in this study.
　Finally, with the compare of the previous formula study of Bagnold(1963)、Van Rijn(1984)、Madsen(1991) and Nielsen(1992) .We can find that the experiment data were in the midst of the scholar's formula.

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