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Abstract
Rate of advance and spread of either a two dimensional starting plume or a two dimensional density current on a vertical slope. The cap of the plume moves at 0.38 times the maximum velocity of the steady layer behind, and that the ratio of the length from the vertical origin to the to the leading edge of the cap to one half the maximum width of the cap is 3. The virtual mass concept is used to show that these two ratios are connected.