Subproject CONNECT: Impact of changes on main rivers, sensitivity of study areas

This subproject is led by Prof. Dr. Michael Becht and apl. Prof. Dr. Tobias Heckmann at the Catholic University of Eichstätt-Ingolstadt. Dr.-Ing. Livia Piermattei was our project investigator from Jan 2019 until October 2020.

Sketch of a study area composed of subareas (grey) and the main channel. The „overall“ sensitivity of the whole area depends on the subareas‘ activity/sensitivity and on their connectivity to the main channel. River discharge, and hence also the transport capacity for pebbles and sand, is subject to climate change through its effects on glacier and snow melt and precipitation.

This subproject deals with the propagation of small-scale, local changes, for example increased sediment yield from hillslopes due to deglaciation: Will detached sediment reach the main channel, and will river discharge be strong enough to transport it further towards the catchment outlet ? Or will the sediment be stored in storage landforms, at the slope foot, or in the floodplains where the transport capacity of the river is not high enough ? What kind of changes can we observe in the main rivers between 1850 and today – are they incising, or are the floodplains aggrading ? The structure of the system could even change, through the formation of a new lake following ongoing glacier retreat.

Together with all subprojects, we aim at answering the question of how sensitively the study areas have reacted and are reacting to climate change. A combination of sensitive/active and well-coupled subareas would render the study area highly sensitive, while low activity and/or poor connectivity would indicate an insensitive system.