Calculation of stone size in riprap bank protection

Determination of the stability of stones on a slope with a given probability of detachment

“…Hence, according to [4], K x = ~i-m~/m~ = 0.866, then for B/h = 30 from the nomogram (see Fig. The angle of the coarse material in the water is approximately equal to 45 = , which corresponds to a side slope m 0 = i.…”

“…Using dependence (9), a method of calculating stones for a riprap bank revetment was proposed in [4]. In this case the fluid friction coefficient I is determined accroding to [5].…”

“…In this case the fluid friction coefficient I is determined accroding to [5]. In [4] the center of a slope, at its base, and at the waterline. If we take into account the probabilistic character of the process of erosion of the revetment, then we can represent these relations in the following form:…”

“…Hence, according to [4], K x = ~i-m~/m~ = 0.866, then for B/h = 30 from the nomogram (see Fig. 3 [4]), by means of (ii) we find the stone size at the foot of the slope: ama x = 0.088 m. The stone size for the part of the slope at the waterline is determined by (12) for K~ = 0.135 (see Fig. Then from the functional relations a = f(p) and A = f(a) in Figs.…”

“…In this case, the equivalent roughness k can be determined by the relation proposed in [3]: k=,~,~, (4) where ~ = 1.4 mm.…”