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Diameter of riprap stone

작성자 Uploader : ezcivil 작성일 Upload Date: 2016-03-19변경일 Update Date: 2016-03-19조회수 View : 416

Riprap protection in the immediate vicinity of the energy dissipator is recommended. Preliminary, unpublished WES test results on riprap protection below energy dissipators indicates the following average diameter (D_50) stone size should result in adequate
erosion protection.

D_50 = D*(V/(g*D)^(1/2))^3

D_50 = the minimum average size of stone, ft or meter, whereby 50% by weight of the graded mixture is larger than D_50 size
D = depth of flow in outlet channel (ft, m)
V = average velocity in outlet channel (ft/s, m/s)
g = gravitational acceleration (32.2 ft/s^2, 9.8 m/s^2)

*** 참고문헌[References] ***

HYDRAULIC DESIGN GRITERIA, SHEETS 722-1 TO 722-3, STOM DRAIN OUTLETS, FIXED ENERGY DISSIPATORS.
D_50 = D*(V/(g*D)^(1/2))^3
변수명 Variable 변수값 Value 변 수 설 명 Description of the variable


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