= Separable decaying line-plume similarity
{title2=$Q\propto z^2/\tau,\ M\propto z^3/\tau^2,\ F\propto z^3/\tau^3$}
The <unsteady Boussinesq triangular-profile line-plume balances> admit a buoyant <similarity solution> $Q=\alpha\rho_0z^2/\tau$, $M=(2/3)\alpha\rho_0z^3/\tau^2$ and $F=(2/3)\alpha\rho_0z^3/\tau^3$, with $\tau=t+t_*>0$. It reconstructs $b=\alpha z$, $W=z/\tau$ and reduced gravity $z/\tau^2$. Origins can be shifted, but the zero-time unshifted solution is singular. Source and initial data are required to select the physical member and region of validity.
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