Difference between revisions of "Conceptual modeling"
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[[File:Heads_Akacievej_2015.png|600px|thumb|none| Flow field at Akacievej determined by head measurements.]] | [[File:Heads_Akacievej_2015.png|600px|thumb|none| Flow field at Akacievej determined by head measurements.]] | ||
| − | === | + | === Determination of aquifer parameters === |
| − | + | A combination of measures was tested and used to determine the aquifer parameters at the site. | |
| + | A long-term pumping test, short-term pump tests and packer tests, a series of slug tests, a packer test, head measurements of the remediation system and at neighboring waterworks gave information about the hydraulic conditions at the site. | ||
| + | A synchronous well sounding round in the larger area allowed to determine the overall groundwater flow field. | ||
| + | At the Akacievej site, the remediation system was turned off and on several times while measuring the head changes in the remediation well and in observation wells in the area. | ||
| + | The groundwater flow field with the remedial pumping and without could be determined. | ||
| + | |||
| + | Tracer tests, information from outcrops etc. | ||
=== Contaminant distribution and dynamics === | === Contaminant distribution and dynamics === | ||
Revision as of 14:51, 23 January 2017
Contents
The field site: Akacievej, Hedehusene
Description of the field site, spill history, overview
- Former dry cleaning facility in Denmark (1973-2003)
- PCE spill in 1976 → dissolved plume with ca. 400 m length evolved until 2005
- Removal of DNAPL by excavation of most polluted soil down to the top of the limestone in 2006
- Installation of a pump-and-treat remediation system in 2007: pumping with 2.5 m3/h from the upper 6 meters of the limestone (mainly crushed limestone
- Treatment of pumped water with activated carbon and reinfiltration through infiltration cassettes and an overflow well
Conceptual model development
The setup of the conceptual model for the Akacievej field site is going to be explained.
Geologic model
Setup of a geologic model based on larger scale geology, borehole information, borehole cores, geophysical measurements etc.
Flow field
To evaluate, where contaminants may migrate, it is important to have knowledge about the local flow field. At the Akacievej site, a measurement campaign with to determine groundwater flow field in the larger plume area was done. Therefore, the hydraulic heads in a larger area around the Akacievej site were leveled on the same day. An extent of the measurement area larger than the plume is beneficial, so flow models with little influence of the boundaries on the flow field can be setup. Further, often there are too few boreholes in the vicinity, which makes it difficult to make a local isopotential map.
Determination of aquifer parameters
A combination of measures was tested and used to determine the aquifer parameters at the site. A long-term pumping test, short-term pump tests and packer tests, a series of slug tests, a packer test, head measurements of the remediation system and at neighboring waterworks gave information about the hydraulic conditions at the site. A synchronous well sounding round in the larger area allowed to determine the overall groundwater flow field. At the Akacievej site, the remediation system was turned off and on several times while measuring the head changes in the remediation well and in observation wells in the area. The groundwater flow field with the remedial pumping and without could be determined.
Tracer tests, information from outcrops etc.
Contaminant distribution and dynamics
PCE concentration measurements before, during and after the pumping test, combined with previous investigations. Modeling interpretations and conceptual model of the plume propagation.
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