Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Calculating flood waves in Lyngen

12.09.2007
It is hoped that detailed mapping of the fjord floor in Lyngen in Troms, northern Norway, will show how flood waves generated by avalanches crashing into the sea may affect the land. The unstable section of Nordnesfjellet, 600-800 metres above the beautiful fjord, is moving up to three centimetres a year.

Seisma, a research vessel belonging to the Geological Survey of Norway (NGU), is sweeping Storfjord with seismic and state-of-the-art, side-scanning sonar. Metre by metre, scientists are studying the floor of the fjord.

Well prepared

On the basis of these detailed maps, staff from the Norwegian Geotechnical Institute (NGI) will construct a precise terrain model of the sea floor. They can use this to calculate how flood waves will build up and sweep over the shores if Nordnesfjellet should one day crash into the sea.

“It’s vital to get as much information as possible about both the mountain and the floor of the fjord. This will enable us to be prepared in case the worst should happen,” Oddvar Longva, a geologist at NGU, tells me. He is the skipper of the Seisma and has a great deal of experience of surveying conditions on the floor of Norwegian fjords.

Large flood waves

The worst scenario here is that several million cubic metres of mountainside will one day sweep over the E6 trunk road and end up in the fjord. This will generate a flood wave that will hit the boroughs of Lyngen, Kåfjord and Storfjord. As many as 6000 people, along with buildings, industrial plants and farmland, may be inundated.

”It’s not very likely that the mountainside will crash into the fjord in the very near future, but if it does the consequences will be enormous. There is therefore a great deal of risk associated with an unstable section of mountainside,” Terje H. Bargel, a geologist at the Geological Survey of Norway (NGU), stresses.

”When we’ve learnt how an unstable section of mountainside behaves, and mapped the terrain below sea level, it will be easier for local authorities to draw up contingency plans to provide warning and ensure evacuation,” he continues.

The danger

Terje Bargel heads the avalanche group at NGU and is very satisfied that the authorities are now putting priority on investigations of major avalanches.

”The Government has allocated an additional five million NOK this year to study the risk of major avalanches. NGU is concentrating particularly on large avalanches involving more than 100 000 cubic metres of rock that may crash right down into fjords and generate tsunamis. We’ve studied 13 sites in the county of Troms in northern Norway that have the potential to develop major avalanches. Lyngen is by far the most important area,” Terje Bargel says.

Installing equipment

It is the northern part of Nordnesfjellet that is moving. NGU has studied the mountain on several occasions by both mapping the geology and gathering geophysical data.

The hazardous stretch of mountainside is four hundred metres broad, five hundred metres high and between fifty and one hundred metres deep. New instruments are now being installed to monitor the mountainside.

Laser meters will monitor movements in the mountainside and tension rods will measure the widening of the fissures. Meteorological instruments are also being set up to monitor the wind, temperature and precipitation.

By Gudmund Løvø

Terje Bargel | alfa
Further information:
http://www.ngu.no

More articles from Earth Sciences:

nachricht AWI researchers measure a record concentration of microplastic in arctic sea ice
24.04.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung

nachricht Climate change in a warmer-than-modern world: New findings of Kiel Researchers
24.04.2018 | Christian-Albrechts-Universität zu Kiel

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: BAM@Hannover Messe: innovative 3D printing method for space flight

At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.

Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...

Im Focus: Molecules Brilliantly Illuminated

Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.

Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...

Im Focus: Spider silk key to new bone-fixing composite

University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.

Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.

Im Focus: Writing and deleting magnets with lasers

Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.

Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...

Im Focus: Gamma-ray flashes from plasma filaments

Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.

The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Invitation to the upcoming "Current Topics in Bioinformatics: Big Data in Genomics and Medicine"

13.04.2018 | Event News

Unique scope of UV LED technologies and applications presented in Berlin: ICULTA-2018

12.04.2018 | Event News

IWOLIA: A conference bringing together German Industrie 4.0 and French Industrie du Futur

09.04.2018 | Event News

 
Latest News

Quantum Technology for Advanced Imaging – QUILT

24.04.2018 | Information Technology

AWI researchers measure a record concentration of microplastic in arctic sea ice

24.04.2018 | Earth Sciences

Complete skin regeneration system of fish unraveled

24.04.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>