HYDROGRAV second meeting.
Danish National Space Center, 11/6 – 2007, 13.00-16.00
Ole B. Andersen (NSI), Rene Forsberg (NSI), P. Knudsen (NSI), G. Strykowski (NSI), Pernille Krogh Engelbredt (NSI)
P. Bauer-Gottwein (ER-DTU), D. Rosberg (ER-DTU), P. Binning (ER-DTU), Lars Christiansen (ER-DTU)
Mads Møller (COWI), Klaus N. Møller (COWI) Mike Butts (DHI).
1) Welcome to the two Ph.d. students.
2) Hydrograv status – budget and project
3) Presentation by Silvia Leiriaô to be given by Peter.
4) Planning the Pump test, planning the field work.
5) WP1 - GRACE Data - Ole
6) WP2 - Forward Gravity Modeling – Peter
7) AOB, Next meeting, Project web pages
PPT presentations were made by Ole and Peter.
Summary of relevant points:
A total of 105 applications for the two Ph.D positions in Hydrograv were received. Out of these, six were selected for interview and two were employed in Hydrograv.
Ole presented the two new Ph.D students, Lars Christiansen and Pernille Engelbredt Krogh, who have been employed as Ph.D for the upcoming 3 years (July 1st 2007 – June 30th 2010). DTU has cosponsored their Ph.d. with 1/3 of their salary for the period.
Buying the Scintrex CG5 instrument
A Scintrex CG5 instrument was bought from La-Coste-Scintrex in Canada on March 1st. There is an eight-month delivery time caused by the building of the instrument. It has been decided to buy the high temperature option which should make the instrument much more in-sensive and operational at high temperatures which will be present at the survey in Botswana.
In order to get the optimal accuracy from the instrument, it was decided to make a course in operating the instrument. The instrument course will take place before the instrument is delivered. The plan is to make it a 5ECTS official course at DTU and established it together with experienced international colleagues. Ole will liaise with O. Francis in Luxemburg and/or German/French colleagues at the upcoming IUGG meeting.
Instrument calibration will be performed at the gravity station at Vestvolden and possibly at the permanent GPS sites in Jutland in Smidstup and Suldrup. Vestvolden has SG gravity observations, and we could investigate the properties of the instrument by re-measuring the difference at the two sites two to three times.
The instrument calibration will be performed by Pernille and Lars after the instrument has been delivered in October. Gabriel will supervise the instrument calibration. An instrument PC-logging update in January-February of 2008 in which a PC connection.
Peter presented some model results on gravity effect of a pump test carried out in corporation with S. Leireio.
Mads Møller suggested to make the pump test on Orø, where there is a well which is regularly pumped as this could be done anytime. The advantage of using the Orø site is that the pumping is periodic. This means that the instrument can be employed at a different location around the well for each pumping.
The other option is to use one of the larger operational sites in Denmark used for tap-water. These sites could be employed during maintenance.
Peter and Mike and Klaus will liaise on establishing the pump test. Peter will carry out a model study to define parameters. Subsequently the location will be selected.
Peter has a student, Sanne Lund, who would like to be affiliated with the pump test for a Masters project.
The Okawanga survey will be carried out in 2008. Tefo Lobelo is a student from the University of Botswana who would like to be affiliated with the project and who would like to carry out a Masters at DTU. Peter will try to help Tefo getting funds.
The Okawanga survey will be planned during the fall of 2007. The weather station can be provided by the water authorities in Botswana.
Full presentation by Peter Bauer-Gottwein
Pump test description by Peter Bauer Gottwein