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  3. 수리학 Hydraulics

Hydraulic Radius

작성자 Uploader : engx 작성일 Upload Date: 2016-03-22변경일 Update Date: 2016-03-22조회수 View : 448

The hydraulic radius is a measure of a channel flow efficiency. Flow speed along the channel depends on its cross-sectional shape (among other factors), and the hydraulic radius is a characterisation of the channel that intends to capture such efficiency. Based on the 'constant shear stress at the boundary' assumption, hydraulic radius is defined as the ratio of the channel's cross-sectional area of the flow to its wetted perimeter (the portion of the cross-section's perimeter that is "wet"):

Rh = A / P

Rh : the hydraulic radius (m, ft, L)
A : the cross sectional area of flow (m^2, ft^2, L^2)
P : the wetted perimeter (m, ft, L)

The greater the hydraulic radius, the greater the efficiency of the channel and the more volume it can carry. For channels of a given width, the hydraulic radius is greater for the deeper channels.

The hydraulic radius is not half the hydraulic diameter as the name may suggest. It is a function of the shape of the pipe, channel, or river in which the water is flowing. In wide rectangular channels, the hydraulic radius is approximated by the flow depth. The measure of a channel's efficiency (its ability to move water and sediment) is used by water engineers to assess the channel's capacity.

*** 참고문헌[References] ***

https://en.wikipedia.org/wiki/Manning_formula#Hydraulic_radius
Rh = A / P
변수명 Variable 변수값 Value 변 수 설 명 Description of the variable


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