عنوان مقاله [English]
Underflow density currents traveling through density-stratified fluids begin to separate from the bed as they reach areas of similar densities, after which they continue their path as interflows through the surrounding ambient fluid. This point, which is referred to as “separation point” of density currents, acts as the boundary between the underflow and interflow density currents. A density current within a stratified environment is known as intrusive gravity currents (IGC), which travel horizontally at a roughly constant velocity U within the stratified layer after propagation (Nokeset al., 2008). Regarding underflow density currents, efforts have been made by many researchers e.g. Singh, and Shah (1971), Lee, and Yu (1997) and Farrell, and Stefan (1986) in the past decades to determine the location of the plunge point of underflow density currents (which is similar to the separation point in interflow currents) using experimental and theoretical methods based on the Densimetric Froude Number at the plunge point Fp. Although studies have been conducted on interflow density currents, including Kao (1977), Wells, and Nadarajah (2008), An, and Julien (2014) and Zhang et al. (2015). Not any research has been found in the literatures about the height of density current at the point of separation from the bed. Hence, in addition to examining the height variations in density currents at the separation point with respect to changes in hydraulic parameters such as flow rate, density of the flow at the inlet, as well as the bed slope, the present study attempted to derive a relation for prediction of density current height at the point of separation from the bed under different conditions.