Lecture 2 - ater ater esources Resources ngineering...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ater ater esources Resources ngineering Engineering ecture 2- Lecture 2 otes by T Wagener & P Reed Notes by T. Wagener & P. Reed Penn State University 1 Principles of Flow in Hydrosystems 2 ater Properties ass or Weight Water Properties Mass or Weight Mass density or density (rho), is the mass per unit volume [kg/m 3 or Ns 2 /m 4 ]. (Mass density of water at 4 C is 1000kg/m 3 ). Density is often assumed constant, so that water is assumed incompressible in hydrology and hydraulics. Incompressibility does not always mean constant density because salt in water changes the ensity of water without changing its volume density of water without changing its volume. Specific weight (gamma) is the gravitational force (weight) per unit volume of water. (Specific weight of water at 4C is 9810 N/m 3 or 62.4 /ft 3 lb/ft ). The relationship between density and specific weight is: g = 3 This is an important characteristic for example when we are dealing with water with different levels of salt content or different temperatures [e.g. Estuaries, density currents, ]. Why is it Important? Example: Ocean Thermohaline Circulation 4 Evaporation makes water more saline and denser Freezing makes water more saline and denser Cold water is denser than warm water ater Properties - ressure Water Properties Pressure Pressure , p , is the force F acting over an area A lim A F d F P dA dA = = Pressure at a point is equal in all directions. The pressure at depth y (assuming no pressure on the water surface) is y P y 5 ater Properties - ressure Water Properties Pressure 6 ater Properties - ressure Water Properties Pressure What is the horizontal pressure (in N per m 2 ) acting at the bottom of...
View Full Document

Page1 / 26

Lecture 2 - ater ater esources Resources ngineering...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online