Input
1.0 cyl, 1.1 sq, 0.9 sharp
1.1 plane, 1.3 dunes
Results
Froude Fr—
Pier scour ys (CSU)—
Contraction scour Δyc—
Total local scour at pier—
Method
CSU pier scour: ys/y1 = 2.0·K1·K2·K3·K4·(a/y1)^0.65·Fr^0.43, Fr = V/√(g·y1). Live-bed contraction scour (Laursen): y2/y1 = (Q2/Q1)^(6/7)·(B1/B2)^k1; estimated here from area ratio.