本文主要探討橋墩在自由式跌水下之影響，「成功人工水草」對橋墩沖刷之保護效果。由試驗結果可知，單獨使用「成功人工水草」在自由跌水下無法有效發揮出導流的功用，總保護效果不佳，但對於橋墩的局部沖刷保護效果則較佳。而「成功人工水草」搭配輔助器支撐後，總保護效率將會超過43.5﹪。另外本文中亦探討不同長度的「成功人工水草」對於橋墩沖刷之保護效果，試驗結果發現，無明顯之影響。

　This paper mainly inquire about Cheng Kung Artificial Waterweeds (CKAW) as a pier scour countermeasure in a free overfall. From the experiment and the results, we know that the effect of diversion was not effectively improved by using CKAW individually in free overfall condition. It indicated that the effect of local pier scour protection is better than total scour protection. However, the efficiency of total protection was improve more than 43.5% by using CKAW with support bar. Furthermore, the effect of pier scour protection in bridges was also investigated by changing length of CKAW. The results showed that length of the CKAW was not related to the effect of pier scour protection.

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