Influence of hydrodynamic control parameters on the operation effect of groundwater circulation well
To clarify the unclear correlation between hydrodynamic control parameters and the hydraulic circulation characteristics of groundwater circulation well(GCW),four quantitative indexes were put forward to finely describe the changes of GCW hydraulic circulation and solute transport rules driven by different hydrodynamic control parameters.The relationship between the flow rate and GCW circulation method with the operation effects of GCW,including the hydraulic circulation effect(∑Δh),the radius of influence(ROI),the hydraulic circulation capture capacity(ξ)and migration rate of particles(v),was investigated by monitoring water level and visualization technology in laboratory simulation experiments.Results indicated that the ROI of the GCW standard circulation method is greater than that of the GCW reverse circulation method,and will significantly increase the area of influence(AOI)at the top of the aquifer,but ξ is lower than the GCW reverse circulation method.With the increase of the flow rate,EΔh linearly improves.When the flow rate is increased from 3 L·h-1 to 12 L·h-1,∑Δh can be increased 4.4 times,meanwhile,ROI and AOI are greater.The increase of the flow rate results in the improvement of v at the same position.When the flow rate increases from 6 L·h-1 to 9 L·h-1,the inner circle v increases by 1.4 times and the outer circle v increases by 1.1 times.The increase of v at locations away from GCW is not significant.The derived curves relating ROI,v,and operation time under varying flow rates can guide the optimization design of hydrodynamic control parameters within the constraints of remediation duration and ROI in GCW remediation projects.
groundwater circulation well(GCW)hydrodynamic control parametershydraulic circulation characteristicscharacterization index
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