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Timescales of sediment dynamics, climate and topographic change in mountain landscapes (SedyMONT) - Erdalen and Bødalen site project

Tildelt: kr 4,0 mill.

The focus of this Norwegian Individual Project (IP 5) within SedyMONT is on the Erdalen and Bødalen catchments (tributary streams) in Nordfjord, western Norway. Both valleys provide, based on the ongoing research in both catchments, excellent opportunitie s to integrate existing and detailed quantitative knowledge on Holocene process rates with new data on sub-recent and contemporary solute and sediment fluxes and process rates generated within this project. Contemporary sediment flux data will be establis hed (i) by the continuation of the existing monitoring programme in Erdalen and (ii) by the new instrumentation of the Bødalen catchment. This new monitoring programme, in combination with repeated analyses of surface water chemistry, atmospheric solute i nputs and granulometric analyses of suspended sediments will provide high-resolution data to analyse and quantify present-day sediment and solute fluxes as well as sediment sources, denudation rates and meteorological and topographic /landscape morphometr ic controls of denudative processes. In addition to standard methods for monitoring bedload transport, innovative techniques like shock sensors and biofilm analysis will be applied to analyse channel stability / mobility and bedload transport rates in bot h valleys. Samples of filtered surface water and suspended particulate material collected on filters will be compiled to estimate the particulate and dissolved loads of runoff from the Erdalsbreen glacier in Erdalen and the Bødalsbreen glacier in Bødalen. The volume and composition of lake sediments will be studied using echosounder, georadar and coring. Investigations on volumes and architecture of storage elements (valley infills, talus cones) using different geophysical methods like georadar and seismi c refraction surveys are performed to further improve the quantitative knowledge on Holocene process rates. Detailed mapping will be performed and interpreted in combination with digital elevation models and data.

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FRINATEK-Fri prosj.st. mat.,naturv.,tek