Trends and controls of Holocene floodplain sedimentation in the Rhine catchment |
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Authors: | Thomas Hoffmann Gilles Erkens Renate Gerlach Josef Klostermann Andreas Lang |
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Affiliation: | 1. Department of Geography, University of Bonn, Meckenheimer Allee 166, 53115 Bonn, Germany;2. Department of Physical Geography, Utrecht University, Heidelberglaan 2, 3584 CS Utrecht, The Netherlands;3. Rheinisches Amt für Bodendenkmalpflege, Endenicher Straße 133, 53113 Bonn, Germany;4. Geologisches Landesamt, Nordrhein-Westfalen, De-Greiff-Straße 195, 47803 Krefeld, Germany;5. Department of Geography, University of Liverpool, L69 7TZ, United Kingdom |
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Abstract: | Holocene floodplain sedimentation in the Rhine catchment is controlled by human and climate impacts. Intricate river behaviour modifies the fluvial response to the external impacts making cause–effect analysis difficult, especially on large spatial scales. To better understand the relative importance and interdependencies of external and internal controls, temporally resolved floodplain sedimentation rates are established using three different methods: i) floodplain storage studies on the trunk stream, ii) depth/age-analysis of overbank deposits from different parts of the catchment and iii) cumulative frequency distributions of 14C-ages from floodplain deposits from various parts of the catchment. The applied methodology strongly differs with the available temporal resolution and the size of the corresponding catchment. All three methods show a strong increase in sedimentation rate for more recent periods that can be linked to increasing human impact. Evidences for climate impacts and intricate river behaviour are less clear and hindered by insufficient temporal resolution of the currently available data. |
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Keywords: | Floodplain sedimentation rate Human impact Climate impact Catchment size Radiocarbon dating Holocene |
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