What is advection in groundwater?
Advection refers to the bulk movement of solutes carried by flowing groundwater. Dispersion refers to the spreading of the contaminant plume from highly concentrated areas to less concentrated areas.
What is Advective velocity?
It refers to the transport of the contaminant caused by the bulk movement of flowing groundwater. The advective flow velocity or the average linear groundwater velocity included in the advection term of Eq.
How far can contaminated groundwater travel?
The average documented distance traveled for GRO and DRO were 295 and 140 feet, respectively. The average MTBE travel distance was 300 feet. The maximum distance documented between a discharge source and a contaminated well was 1670 feet.
What is the difference between advection and dispersion?
Advection refers to the bulk movement of solutes carried by flowing groundwater. Dispersion refers to the spreading of the contaminant plume from highly concentrated areas to less concentrated areas. Dispersion coefficients are calculated as the sum of molecular diffusion, mechanical dispersion, and macrodispersion.
What is the meaning of advective?
Definition of advection : the usually horizontal movement of a mass of fluid (such as air or an ocean current) also : transport (as of pollutants or plankton) by such movement.
Is convection a bulk flow?
Convection is the transport of a substance by bulk flow, where bulk flow is often the movement of fluid down a pressure gradient. In a free medium, convection is molecular-size independent; all solute molecules move in the direction and with the velocity of the bulk flow.
How does contaminated groundwater reach wells?
Ground water and contaminants can move rapidly through fractures in rocks. In areas surrounding pumping wells, the potential for contamination increases because water from the zone of contribution, a land area larger than the original recharge area, is drawn into the well and the surrounding aquifer.
How does contaminated groundwater reach drinking water wells?
It can be through spills or releases from stored industrial wastes from sources below. From above the land surface, water can be contaminated through leaking petroleum, septic tanks, and others.