Soft-rock scouring processes downstream of weirs

M. H. Cheng, J. J. Liao, Y. W. Pan, G. W. Li, M. W. Huang, W. H. Lo, S. T. Hsu

研究成果: Conference contribution同行評審

4 引文 斯高帕斯(Scopus)


Diversion weirs are typically constructed to elevate river water levels and thereby increase water supplies. Most riverbeds in the western foothills of Taiwan are composed of soft sedimentary rocks covered with an armor layer of varying thickness. Due to the low rock strength and head fall caused by weirs, rapid scouring downstream of the weir often occurs once the armor layer is worn away. To estimate scour depth and mitigate its damage to weir foundations, scouring processes must be identified correctly. Because of different mechanical behaviors and the water-jet conditions, scouring processes downstream of a weir on soft rock may not be that same as those assumed by existing models. Analytical results from a series of studies of scouring downstream of weirs on soft rock indicate that the shape of a scour hole on soft rock differs markedly from that of a scour hole on hard rock. This study identified three basic scouring processes downstream of weirs, namely, (1) plucking, (2) uniform incision, and (3) trenching incision. The suitability of existing approaches for calculating the depth of a scour hole on soft rock were also assessed.

主出版物標題Scour and Erosion
版本210 GSP
出版狀態Published - 1 12月 2010
事件5th International Conference on Scour and Erosion - San Francisco, CA, United States
持續時間: 7 11月 201010 11月 2010


名字Geotechnical Special Publication
號碼210 GSP


Conference5th International Conference on Scour and Erosion
國家/地區United States
城市San Francisco, CA


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