本文以理論分析及動床實驗來探討河槽內不均勻圓柱形橋墩(即圓柱形橋墩位於圓形基礎上)及群樁基礎之局部沖刷及束縮沖刷特性，及探討橋墩佈置及流況對局部沖刷之影響，以求得圓形基礎及群樁基礎之局部最大沖刷深度、最大堆積丘位置及沖刷範圍。
實驗結果發現，橋基頂端高程位置高於底床時其局部沖刷深度較均勻橋墩時大；橋基頂端高程位置介於底床和最大局部沖刷深度之間時可減少局部沖刷深度。在雙柱橋墩橫向排列時，其雙柱間距( s )越小，局部沖刷沖刷深度越大，當s = 0時會產生最大的局部刷深。

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