# Three-Dimensional Density Current

*by*Trevor R. Fietz,

Ian R. Wood,

**Serial Information**:

*Journal of the Hydraulics Division*, 1967, Vol. 93, Issue 6, Pg. 1-24

**Document Type:**Journal Paper

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**Abstract:**A laboratory investigation of a three-dimensional density current is described. The density current was produced by the release of salt water at the upper end of a sloping floor immersed in a tank of fresh water. The flow regime was classified as laminar, indeterminate, or turbulent for floor slopes up to 20○ to the horizontal. The lateral spread of turbulent flows was correlated with a Richardson number measured at the injection orifice. Detailed measurements of velocity and density were made at three cross sections of one turbulent density current on a floor of slope 20○. The velocity and density distribution were found to be reasonably self preserving when described in terms of two characteristic length scales, one a characteristic width and the other a characteristic height of a cross section. The maximum velocity varied as X

^{-0.7}where X was the distance from a finite virtual line source used' to locate the free boundaries of the flow. The mean density excess varied as X

^{-1.1}. The entrainment constant

**Subject Headings:**Density currents | Turbulent flow | Salt water | Slopes | Floors | Fresh water | Water tanks | Flow measurement |

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