Effect of injection mode on the spatial moments of a non-reactive solute plume

The effects of solute injection mode on the spatial moments of instantaneously injected, non-reactive solute plume are examined in the stochastic-advective framework. Two different modes for the introduction of a solute in a heterogeneous aquifer are considered, namely injection of solute in the resident fluid and in fluid flux. The first and second spatial moments for the two injection modes are quantified using closed-form expressions.