不同間距丁壩群之局部沖刷試驗研究

Experimental Study on Local Scour of Spur Dikes with Different Spacings

黃大原(Da-Yuan Huang)

指導教授 ： 葉克家 ； 葉克家

國立交通大學/工學院/土木工程系所/碩士(2013年)

https://doi.org/10.6842/NCTU.2013.00019

摘要

丁壩工法為目前國內治理規劃常見之工程手段，類型繁多包括透水與不透水、浸沒與非浸沒等，而丁壩佈置後之水理、輸砂與底床沖淤交互機制頗為複雜，值得加以分析其行為。本實驗針對濁水溪常見之手槍型丁壩工法進行探討。
本研究藉由長直渠槽，於清水沖刷條件下進行浸沒式手槍型丁壩群試驗，設計不同間距與不同福祿數之案例，分別觀察手槍型丁壩群之壩頭沖刷深度變化，藉以了解水流沖擊手槍型丁壩群之沖刷機制。
利用實驗數據獲得之迴歸式，當得知福祿數、水深壩高比(h/H)及間距壩長比(D/L)時，即可預估丁壩頭之最大沖刷深度，作為工程實務應用之參據。

關鍵字

丁壩 ； 局部沖刷 ； 沖刷坑 ； 河岸侵蝕

並列摘要

Spur dike including permeable, impermeable, submerge and emerge, is currently a common method regarding engineering in our country. After building spur dike, it brings complicated interaction mechanism of water management, sediment, and seabed erosion, which is a worth analyzing process. This experiment focuses on investigating Pistol -shaped Spur dike construction method in Jhuoshuei River.
In order to investigate the mechanism of water impact on Gun-shaped Spur dikes, this study concentrates on submerged Gun-shaped Spur dikes test, using long straight flume experiment in clear-water scour condition, and designing different spacing and random Froude number case to observe scour depth change on Gun-shaped Spur dikes.
We can use Froude number, water depth of the dam height ratio (h/H) and spacing ratio (D/L), obtaining from the regression equation in the experiment data, to estimate the maximum scour depth as the basis for the practical application of engineering reference.

並列關鍵字

spur dike ； local scour ； scour hole ； bank erosion

參考文獻

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4. Ettema, R. and Muste, M. (2004), “Scale effects in flume experiments on flow around a spur dike in a flatbed channel” J. Hydr. Engrg, 130(7), pp. 635-646.

6. Ghodsian, M. and Vaghefi, M. (2009), “Experimental study on scour and flow field in a scour hole around a T-shape spur dike in a 90° bend”, International Journal of Sediment Research, 24(2), pp. 145-158.

7. Gregoretti, C., Maltauro A., and Lanzoni, S. (2010). “Laboratory experiments on the failure of coarse homogeneous sediment natural dams on a sloping bed ”, Journal of Hydraulic Engineering, 136(10), pp. 868-879.

9. Karami, H., Ardeshir, A., Behzadian, K. and Ghodsian, M. (2011), “Protective spur dike for scour mitigation of existing spur dikes”, Journal of Hydraulic Research Vol. 49, No. 6, pp. 809-813.