Previous hazards in Nyhavna

The area sits on a man made reclaimed land that is surrounded by the Nidelva river and the Trondheim fjord. Because the area was artificially created from dredging, it lies relatively flat and low above the sea level and it therefore often floods. In addition, the paved over peninsula lacks permeable surfaces to absorb excess rainwater and the stormwater runoff with all of the pollutants from the industrial sites contaminates the marine environment around the site. Most of the flooding occurs as a result of seasonal snowmelt in the spring when the river experiences excess flow and during heavy rainfalls. Although not relevant specifically to our case area of Nyhavna, the city of Trondheim has quick clay landslide prone areas and this should be kept in mind when developing the site further as it might pose risk to surrounding areas and water levels in Nidelva. In addition, sea level rise is a concern for long-term planning as it might lead to further shoreline erosion and infrastructure failure.

Possible risks in the future

The low-risk scenario refers to the flooding that would take place in 2050 as a result of sea level rise. The projected sea level rise for this year is only 5 cm which will have a minimal impact on the area (NASA, n.d.)(Fig.11) . According to this scenario, only a few centimeters of the shoreline will be impacted by flooding especially around the edges of Transitkaia and Kullkranpiren peninsulas. These are heavy industry areas containing a cement factory and a scrap yard, which might lead to a pollution runoff and impact the water quality in and around the site.

their structural integrity might be compromised. The current use of Dora II as a ocean testing center will no longer be feasible and the coastline along the shore will be further pushed back.Leaching from the flooded buildings might lead to contamination of the natural resources around the site. The roads and critical infrastructure along the shore will be no longer accessible.

The medium-risk scenario refers to predicted sea level rise flooding in the year 2100, which is expected to increase by 0.24 m (NASA, n.d.)(Fig.12). This will completely submerge and flood almost half of Transitkaia and render the use of buildings and infrastructure on the peninsula unusable. Parts of Dora I and II will also be flooded and

High-risk scenario is a seal-level rise prediction for year 2150 when the flooding will reach the highest level. It is also the longest future sea-level rise prediction currently available.The sea level will rise by 0.43 m by the middle of next century (NASA, n.d.)(Fig.13). At this point, the sea level rise and storm surge predictions combined will submerge all of Nyhavna. Roads, buildings and all of the essential infrastructure will be compromised and the area will be rendered unusable unless the ground is elevated and proper mitigation measures are taken into account beforehand.