coefficient de Manning

См. также в других словарях:

• Manning formula — The Manning formula, known also as the Gauckler–Manning formula, or Gauckler–Manning–Strickler formula in Europe, is an empirical formula for open channel flow, or free surface flow driven by gravity. It was first presented by the French engineer …   Wikipedia

• Manning N —   after Robert Manning. A formula of river velocity:   v = (R0.67 x S0.5) / n   where R is hydraulic radius, S is channel slope and n is Manning roughness coefficient …   Geography glossary

• manning roughness coefficient —   after Robert Manning. A measure of channel resistance which is used as part of a formula to calculate velocity (Manning N). The values vary between 0.02 for smooth channels and 0.10 for very rough channels …   Geography glossary

• Manning equation —    An equation used to compute the velocity of uniform flow in open channel: V=1.486/n R2/3 S1/2, where V is the mean velocity of flow (in cfs units), R is the hydraulic radius in feet, S is the slope of the channel or sine of the slope angle,… …   Lexicon of Cave and Karst Terminology

• Robert Manning (engineer) — Robert Manning (1816 1897) was an Irish engineer. He is known for creation of the Manning formula.Manning was born in Normandy, France, in 1816, a year after the battle of Waterloo, in which his father had taken part. He died in 1897. In 1826, he …   Wikipedia

• Prevision des crues — Prévision des crues La prévision des crues est la modélisation des quantités de précipitations, solides ou liquides, reçues dans un bassin hydrographique et de leur effet sur l écoulement dans les cours d eau. Les services météorologiques… …   Wikipédia en Français

• Prévision des crues — La prévision des crues est la modélisation des quantités de précipitations, solides ou liquides, reçues dans un bassin hydrographique et de leur effet sur l écoulement dans les cours d eau. Les services météorologiques nationaux roulent des… …   Wikipédia en Français

• Hydraulic roughness — is the measure of the amount of frictional resistance water experiences when passing over land and channel features.[1] One roughness coefficient is Manning s n value.[2] An increase in this n value will cause a decrease in the velocity of water… …   Wikipedia

• Chézy formula — In fluid dynamics, the Chézy formula describes the mean flow velocity of steady, turbulent open channel flow: where v is the mean velocity [m/s], C is the Chézy coefficient [m½/s], R is the hydraulic radius ( water depth) [m], and i is the bottom …   Wikipedia

• Dimensionless quantity — In dimensional analysis, a dimensionless quantity or quantity of dimension one is a quantity without an associated physical dimension. It is thus a pure number, and as such always has a dimension of 1.[1] Dimensionless quantities are widely used… …   Wikipedia

• Darcy–Weisbach equation — In fluid dynamics, the Darcy–Weisbach equation is a phenomenological equation, which relates the head loss or pressure loss due to friction along a given length of pipe to the average velocity of the fluid flow. The equation is named after Henry… …   Wikipedia