METHOD OF RIVER BOTTOM PROTECTION AGAINST EROSION Russian patent published in 2005 - IPC

FIELD: hydraulic engineering, particularly to prevent river or channel bottom erosion.

SUBSTANCE: method involves dividing river bed by overfalling weirs into several parts along river length, wherein the parts have design slopes of i_d=(21.16*(d^2/3)*(h^1/3))/(C²*R), here C is Shesi's coefficient, C=(1/n)+((0.45*lgR)/n), R is hydraulic radius, R=ω/λ, d - maximum diameter of 60% particles by weight in ground, h-flow depth with design supply flow rate, ω is effective flow cross-section, λ is wetted perimeter length, n is roughness coefficient, n=0.025. Overfalling weirs are formed by moving and sedimentation of bottom alluvion ground with taking into consideration of ground composition. Distance between overfalling weirs is determined from the following formulae: l_w=H/(i-i_d), wherein number of overfalling weirs N=i/i_w, where i is specific hydraulic slope which is actually equal to river bottom slope, H is overfalling weir height, l is total river length.

EFFECT: reduced cost and increased efficiency.

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