目前在海岸保護上以剛性工法為主，包括海堤、護岸、突堤和離岸堤，短期上這些工法雖能防潮防浪，但長期看來這些工法僅能遏止或減緩當地海岸線後退，並無法控制漂沙特性而使海岸侵蝕現象轉移他處。施做離岸潛堤為經常使用的工程手段，但是依過去的經驗得知，離岸潛堤常常受到波浪的作用而產生堤腳沖刷，以致逐漸產生破壞，失去其功能，因此必需經常維護。
依工程實務而言，要達到海岸的保護，僅以離岸潛堤為主要的工程手段，似乎尚無法完全達到所需要的目的。因此，採用近自然的工法之保護設施，取代消波塊林立的剛性海堤並研發更有效及經濟的工程方法，以解決海岸沖刷的問題。
爰此本文即採用筐網應用在海岸領域中，依其消能作用的特性，以作為海岸波浪的消能，進行成效分析研究，以達到保護海岸的功效。

Currently the major method to protect coastal is hardness method, including seawall, revetment, groin, and breakwater. In a short term, these methods can keep seashores from being the worse of wear by tide and humidity, but in a long term, these ones can only restrain and chasten the local coastline to move backwards. However, they cannot control the characteristics of the floating sand, which can have seashores eroded and move the eroding phenomenon to another place. Putting segmented breakwater into practice is always used means of engineering. But segmented breakwater, what we know, on the basis of the past experience, often produces the bottom of embankment eroded away by the tidal function, and results in steadily destroying, losing its function. Hence, we have to maintain constantly.
Practically, for the protection of coastal, only to adopt segmented breakwater is not sufficient and segmented breakwater seems not likely to reach what we expect to be. Therefore, to adopt naturnaher to protect facilities instead of hardnessseawall with some wave-eliminated stone and to research and develop more efficient-and-economical ways of engineering in order to solve the problems of eating away embankments.
In this text, porous-cylinder structure is adopted among the field of coastal. Its characteristics of energy-eliminated function can be designed for energy elimination of coastal waves, which can be developed into the study on the analysis of effectiveness, in order to reach the efficiency of the protection of coastal.

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