Capture-zone design in an aquifer influenced by cyclic fluctuations in hydraulic gradients |
| |
| Authors: | Willy Zawadzki Don W Chorley Guy Patrick |
| |
| Institution: | (1) Golder Associates Ltd., 500-4260 Still Creek Drive, Burnaby, V5C 6C6, Canada, |
| |
| Abstract: | Design of a groundwater pumping and treatment system for a wood-treatment facility adjacent to the tidally influenced Fraser
River estuary required the development of methodologies to account for cyclic variations in hydraulic gradients. Design of
such systems must consider the effects of these cyclic fluctuations on the capture of dissolved-phase contaminants. When the
period of the cyclic fluctuation is much less than the travel time of the dissolved contaminant from the source to the discharge
point, the hydraulic-gradient variations resulting from these cycles can be ignored. Capture zones are then designed based
on the average hydraulic gradient determined using filter techniques on continuous groundwater-level measurements. When the
period of cyclic fluctuation in hydraulic gradient is near to or greater than the contaminant travel time, the resulting hydraulic-gradient
variations cannot be ignored. In these instances, procedures are developed to account for these fluctuations in the capture-zone
design. These include proper characterization of the groundwater regime, assessment of the average travel time and period
of the cyclic fluctuations, and numerical techniques which allow accounting for the cyclic fluctuations in the design of the
capture zone.
Electronic Publication |
| |
| Keywords: | Tides Seasonal effects Capture zone Modeling British Columbia |
| 本文献已被 SpringerLink 等数据库收录！ |
|
