Otto, Jan-Christoph: Paraglacial sediment storage quantification in the Turtmann Valley, Swiss Alps. - Bonn, 2006. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc:
author = {{Jan-Christoph Otto}},
title = {Paraglacial sediment storage quantification in the Turtmann Valley, Swiss Alps},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2006,
note = {Sediment flux plays a central role within evolution of land surfaces and Earth's biogeochemical system. Within sediment flux systems, the role of sediment storage is often the least understood part. This study analyses the spatial distribution of sediment storage and quantifies sediment volumes in the high Alpine Turtmann Valley, Swiss Alps. A detailed geomorphological mapping provided information on the distribution structure of storage landforms. Geophysical methods were used to derive sediment thickness of single landforms in one hanging valley that have been used to model the storage volume for different landform types in all hanging valleys. The remaining sediment stores were quantified using different, subsystem specific GIS approaches.
A total sediment volume of 780 - 1,030 x 106 m3 is stored in the Turtmann Valley. More than 70 % of the material is located in the hanging valleys, resulting from a de-coupling and closure of the hanging valley subsystem. Within the hanging valleys, moraine deposits store the greatest volumes (70%), while slope landforms cover the largest areas (> 50%). Thus, the spatial distribution of stores emerges from the system behaviour, process intensity and land surface structure of the hanging valleys.
Average denudation rates for the Turtmann Valley vary between 0.9 and 1.25 mm a-1, calculated for a time period of 10 ka. Single landform denudation rates vary from 0.2 – 3.1 mm a-1 for talus slopes and cones to 0.1 – 1.8 mm a-1 for active rock glaciers. These values lie within the ranges of comparable values for the Alps.
The spatial pattern of landforms is used to infer a relative model of paraglacial landform evolution. A reworking of glacial deposits in the hanging valleys was accomplished mainly by glacier derived rock glaciers. Their distribution hints on three phases of paraglacial evolution since the End of the Pleistocene. Since most of today’s active rock glaciers are talus-derived, the reworking of paraglacial deposits is most probably completed and the paraglacial period in the hanging valleys of the Turtmann Valley is considered to be terminated.
This study presents a method to quantify landform volumes in a meso-scale alpine catchment. For the first time volumes are quantified for different landform types. Thus, a gap is closed between previously performed small scale studies and large river catchment investigations that provide non differentiated sediment volumes. A comparison of denudation rates indicates that the quantified volumes lie within a realistic range of previous studies. Finally, the importance of rock glaciers in the paraglacial evolution of the valley and the sediment storage distribution stresses the role of periglacial processes in the sediment flux system of high alpine environments.},

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