Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 407384
Title Reconstruction of floodplain sedimentation rates: a combination of methods to optimize estimates
Author(s) Hobo, N.; Makaske, B.; Middelkoop, H.; Wallinga, J.
Source Earth Surface Processes and Landforms 35 (2010)13. - ISSN 0197-9337 - p. 1499 - 1515.
DOI http://dx.doi.org/10.1002/esp.1986
Department(s) Landscape Centre
Alterra - Soil geography
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) rhine-meuse delta - chernobyl accident - vertical migration - fluvial deposits - river rhine - netherlands - fallout - radiocesium - catchment - cs-137
Abstract Reconstruction of overbank sedimentation rates over the past decades gives insight into floodplain dynamics, and thereby provides a basis for efficient and sustainable floodplain management. We compared the results of four independent reconstruction methods - optically stimulated luminescence (OSL) dating, caesium-137 (Cs-137) dating, heavy metal analysis, and flood bed interpretation - applied at three embanked floodplain sites along lower Rhine River distributaries in the Netherlands. All methods indicate significant sedimentation rates on the floodplains, varying between 2-7 mm/a in the distal zones and 3-9 mm/a in the proximal zones. On a rapidly developing sand bar along a natural levee sedimentation rates of 9 to 25 mm/a were found. Except for some minor inconsistencies in Cs-137 dating results, all methods show decreasing sedimentation rates with increasing distance from the river channel. Intercomparison of the results of the different dating methods revealed the potential errors associated with each method, particularly where disagreement among the results were found. Uncertainties may arise due to (1) grain-size dependent downward migration of Cs-137, (2) smoothing of the vertical heavy metal and Cs-137 profiles, (3) delayed sediment-associated input of Cs-137 in addition to direct atmospheric fall-out, (4) overestimation of the burial age in OS L dating due to incomplete resetting of the OSL signal, or (5) non-linear relationships between sediment deposition and flood magnitude in the count-from-the-top correlation between sediment lamination and past observed flood records. Still, taking the uncertainties associated with each method into account, the results are generally in good agreement. Using the results we indicate the optimal spatial range of application of each method, depending on sediment texture and sedimentation rate. The optimal spatial and temporal ranges differ for each method, but show significant overlap. A combination of the methods will thus provide maximum information for accurate estimation of sedimentation rates on a decadal time scale.
Comments
There are no comments yet. You can post the first one!
Post a comment
 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.