首页|Experimental Study on Local Scour Downstream of Arced Piano-Key Weirs
Experimental Study on Local Scour Downstream of Arced Piano-Key Weirs
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NETL
NSTL
Asce-Amer Soc Civil Engineers
The piano key weir is a unique new geometric type that can have a linear (rectangular or trapezoidal) or arc (trapezoidal) layout. Depending on the flow hydraulics and the bed type, different shapes of scour holes can form downstream of these weirs. Two types of piano key weirs-rectangular, and trapezoidal with an arced plan-were built to investigate the sediment transport patterns. The bed material comprised sand (d_(50) = 1.25 mm) and gravel (d_(50) = 8.9 mm). The results revealed that the scour hole dimensions and bed topography patterns depend on hydraulic conditions, crest geometry, and bed material gradation. Analysis of the data suggested that local scour depths behind a piano key weir with a rectangular crest might be as much as 12% larger than those for other configurations in sand or gravel.
Local scourPiano key weir (PKW)Scour holeSediment transport
Mohammad Karimi Chahartaghi、Sohrab Nazari、Mohammad Mahmoodian Shooshtari
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Dept. of Civil Engineering Water Resources Engineering and Management, Shoushtar Branch, Islamic Azad Univ., Shoushtar 6451741117, Iran
Dept. of Civil Engineering, Eghlid Branch, Islamic Azad Univ., Fars 7381885939, Iran
NETL
NSTL
Asce-Amer Soc Civil Engineers
