Databank

Databank

Posiva publishes Working Reports and Posiva Reports. From the year 2006 nearly all the reports have been published on our webpage and they can be found in the databank. In the databank you can also find our Annual Reviews and some other publications as well. You can also find print-quality pictures and useful links in the databank.

Recent publications


Workreport 2015-40

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Name:

Transverse Flow Measurements at the Olkiluoto Site in Eurajoki, Drillholes OL-PP56 and OL-KR40 and Groundwater Observation Tubes OL-PVP21, OL-PVP22, OL-PVP23, and OL-PVP26

Writer:

Komulainen, J., Pöllänen, J.

Language:

English

Page count:

78

Summary:

The Posiva Flow Log, Transverse flow method (PFL TRANS) measures the flow of groundwater across a drillhole. A part of a drillhole is enclosed and transverse flow rate and direction are measured across this section. The enclosed section is short (0.4 m) and usually closes in one water conductive fracture.

The flow measurements were carried out in drillholes and in groundwater observation tubes located in the overburden. The measurements in the observation tubes were performed in perforated sections of the tubes. The measurements were carried out in the drillholes OL-PP56 and OL-KR40 and in the groundwater observation tubes OL-PVP21, OL-PVP22, OL-PVP23 and OL-PVP26 at the Olkiluoto investigation site between June and October 2013.

Two different transverse flowmeters were used for the measurements. The transverse flow tool (PFL TRANS) was used to measure the transverse flow in the drillholes with a diameter of 76 mm. A lighter version of the PFL TRANS probe (PFL TRANS Lite) manufactured for short holes with a smaller diameter (56 mm) was used in the groundwater observation tubes.

In drillhole OL-KR40 transverse flow at the fracture at the depth of 607.6m was measured only with two probe orientations due to an equipment failure, and no flow was detected. In OL-PP56 three fractures were measured with at least four different probe orientations. At the depths of 34.8 and 43.5 m transverse flow was detected. The four groundwater observation tubes were measured with four probe orientations in each tube. All groundwater observation tubes included in the measurement plan could not be measured due to low groundwater level and other problems.

Keywords:

Keywords: Groundwater, flow, measurement, bedrock, drillhole, groundwater observation tube, Posiva Flow Log.

File(s):

Transverse Flow Measurements at the Olkiluoto Site in Eurajoki, Drillholes OL-PP56 and OL-KR40 and Groundwater Observation Tubes OL-PVP21, OL-PVP22, OL-PVP23, and OL-PVP26 (pdf) (2.9 MB)


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