The impact of climate change on glacial sediment delivery to rivers
نویسنده
چکیده
Climate change scenarios indicate that most glaciers in Norway will have disappeared by the year 2100. As the downstream river reaches are often completely dominated by glacial sediments, large environmental changes are expected. This paper discusses and reviews sediment transport studies in order to deduce the impact of climate change on the sediment delivery of glaciers. Sediment monitoring programmes have revealed large seasonal and year-to-year changes in sediment transport that reflect the rate of melt-out and flushing of sediments in the subglacial conduits and cavity systems. Long-term changes in sediment delivery were revealed by sedimentation rates in proglacial lakes. It was found that the reduction in the glacier volumes during the last 300 years and the increased meltwater runoff, were accompanied by an increase in suspended sediment supply. A doubling of the sediment yield is estimated for the Nigardsbreen Glacier during the period 2070–2100, due to predicted temperature rise.
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