As the BONUS Seamount Project is approaching the final hours, an overview of the fieldwork the group have accomplished over the last three years is now available.
The resarchers have made 25 different field trips covering the three countries of Finland, Germany and Denmark. In Finland the work have been carried out mainly in the Hanko area, in Germany focus have been on the Ekernförde Bay area. In Denmark researchers was investigating the Horsens Bay area. Different forms of underwater vehicles were also tested on the same occasion (see logs below article).
Seven new and one old site discovered
The field trips and following analysis have resulted in identifying no less than seven new sites of submarine groundwater discharge, called SGDs.
Four of these are located in the Ekernförde Bay, one in Flensburg Bay, one at the Hanko Peninsua and one in Horsens Bay (see map above). The team also identified a SGD number five at Ekernförde, close to Mittelgrund, but this site is not a novel encounter, since its’ existence have been known for many years through the local community. However, this SGD have still played an important role in the project, serving as a control site amongst other things.
This brings the total number of known SGD sites in the Baltic Sea up to 24. All of wich can help scientists better understand, how the groundwater-sea dynamics work in the Baltic Sea.
See their locations on the map below. For further informaiton on the sites or field work details, please contact [email protected]
Field work logs of the Seamount team 2017-2019
| No | Date | Location | Activity | Partner | |
| Begin | End | ||||
| 1 | 23-05-2017 | 24-05-2017 | Hanko Lappohja, Finland | Seafloor seismic survey, seawater and sediment sampling onboard RV GEOMARI | GTK |
| 2 | 25-05-2017 | 26-05-2017 | Hanko Hopearanta-Furunäs, Finland | Seafloor seismic survey, seawater and sediment sampling onboard RV GEOMARI | GTK |
| 3 | 17-08-2017 | 17-08-2017 | Vattajanniemi, Finland | Seafloor seismic survey, seawater and sediment sampling onboard RV GEOMARI | GTK |
| 4 | 23-10-2017 | 24-10-2017 | Hanko Lappohja, Finland | Ground-penetrating radar survey | GTK |
| 5 | 26-10-2017 | 26-10-2017 | Hanko Lappohja, Finland | Groundwater test well sampling | GTK |
| 6 | 13-11-2017 | 17-11-2017 | Eckernförde Bay, Germany | RV LITTORINA cruise L17-19, SGD survey | CAU |
| 7 | 04-04-2018 | 05-04-2018 | Hanko Lappohja, Finland | Refraction seismic survey | GTK |
| 8 | 14-05-2018 | 18-05-2018 | Horsens Fjord, Denmark | Seismic mapping onboard RV MARITINA | GEUS |
| 9 | 21-05-2018 | 25-05-2018 | Hanko Lappohja, Finland | Radon survey with RV GRIDI, groundwater test well sampling | GTK, CAU |
| 10 | 30-05-2018 | 31-05-2018 | Hanko Lappohja, Finland | Sediment, porewater and seawater sampling onboard RV GEOMARI. Seafloor sensor frame mooring | GTK |
| 11 | 28-06-2018 | 28-06-2018 | Eurajoensalmi, Finland | Seafloor seismic survey, seawater and sediment sampling onboard RV GEOMARI | GTK |
| 12 | 06-07-2018 | 09-07-2018 | Eckernförde Bay, Germany | RV ELISABETH MANN BORGESE cruise EMB187, Test of AUV platform and SGD survey | IOW, CAU, EvoLogics, NOA |
| 13 | 08-08-2018 | 10-08-2018 | Horsens Fjord, Denmark | Radon survey and beach porewater sampling | GEUS, CAU |
| 14 | 22-10-2019 | 26-10-2019 | Eckernförde Bay, Germany | RV LITTORINA cruise L18-15, SGD survey | CAU |
| 15 | 23-08-2018 | 24-08-2018 | Eckernförde | Sampling of SGD at Hemmelmark | CAU |
| 16 | 21-03-2019 | 22-03-2019 | Eckernförde Bay, Germany | RV LITTORINA cruise L19-1a, SGD survey | CAU |
| 17 | 10-04-2019 | 10-04-2019 | Berlin, Germany | Radon sensor test at groundwater well | CAU, EvoLogics |
| 18 | 29-04-2019 | 03-05-2019 | Horsens Fjord, Denmark | Seismic mapping and core sampling onboard RV MARITINA | GEUS, CAU |
| 19 | 14-05-2019 | 17-05-2019 | Eckernförde Bay, Germany | RV LITTORINA cruise L19-06, hydroacoustic survey and porewater sampling | CAU; BONUS ECOMAP; GEOMAR, Univ. Otago |
| 20 | 15-08-2019 | 16-08-2019 | Horsens Fjord, Denmark | Radon survey and diving | GEUS, CAU |
| 21 | 26-09-2019 | 27-09-2019 | Hanko Lappohja, Finland | Sediment, porewater and seawater sampling onboard RV GEOMARI. Sea surface Ra sampling | GTK, Univ. Helsinki, IOW |
| 22 | 28-09-2019 | 28-09-2019 | Hanko Lappohja, Finland | Groundwater test well sampling | GTK, Univ. Helsinki, IOW |
| 23 | 21-10-2019 | 25-10-2019 | Kiel Bight, western Baltic Sea | RV LITTORINA cruise L19-14, SGD survey | CAU; BONUS INTEGRAL |
| 24 | 21-10-2019 | 26-10-2019 | Hanko Lappohja, Finland | RV GEOMARI cruise, Test of AUV platform and SGD survey | GTK, CAU, IOW, EvoLogics |
| 25 | 11-11-2019 | 15-11-2019 | Horsens Fjord, Denmark | Coring and porewater sampling + FloaTEM Measurements by Aarhus University | GEUS, Aarhus University |