Farming has existed for centuries in Norway. In those locations where the farm itself has existed for a long time, a farmmound can be found. These mounds consist of the remains of older farm buildings, the direct surroundings and remains of land use. Many of these farmmounds are still in use, others are abandoned.
Farmmounds are a protected type of archaeology in Norway, many are registered as a monument. The preservation status of most is however unknown. Some visible monitoring occurs, which is limited to the surface. Monitoring of the underground is needed, and this project In Situ Farms addressed the first steps in monitoring. At current we have two farmmounds under monitoring, and are working a related stone age site in the Northern part of Norway. First years of monitoring show that the farmmounds in general are preserved, but under threat of groundwater flow, some desication and possibly change of land management. The results have been published in Vandrup Martens et al, 2016 and other publications.
The Follobanen (En: Follo Line, Oslo, Norway) is a large project creating a new railway from Oslo to the South. It includes the construction of a large tunnel, and a landtunnel just south of Oslo Central Station.
As the first bend of the railway line hits the historical medieval centre of Oslo, it is necessary to take protective measures. MVH Consult works with the local office of NIKU to perform valuable monitoring of redox conditions in the archaeological layers.
We installed redox potential and temperature sensors in two profiles along the new sheetpiling. Other partners installed oxygen and continuous pH sensors. Together these will give an insight on the effect of building a sheetpiling next to an archaeological monument.
The world heritage site Bryggen in Bergen (Norway) has been threatened by oxidation of the soil. That soil is a human made soil, and contains all kinds of organic materials. After the construction of a sheetpiling, that soil got into contact with less and less water. A large project team was formed, and enlarged in time. This team consisted of several experts. Michel Vorenhout was asked in 2011 to measure and interpret the redox potential of the soil.
In archaeological sites, it is always difficult to work. In general it is impossible to make holes, or use disturbing machines. We had to try to get our probes down into a soil, where we were also expecting large stones and other objects, besides a more woody organic layer. The team came up with a push rig, which uses a 3.5 cm pin. The pin was pushed and drilled down. We installed probes into the hole thus created.