Schematic representation of the oblique aggradation. (Source: Candel et al. 2017)
Innovative components
The origin of streams that flow through peat-filled deposits such the Drentsche Aa in the Netherlands is interesting due to their limited erosion and lateral migration over time. Data collected with various methods was used to map the stream profile back when the peat growth started 12.000 years ago: Data from Makaske et al (2015) about the date and rate of peat development; ground-Penetrating Radar to distinguish sandy channel deposits within the peat and Optically stimulated luminescence dating to determine the deposition period of sand layers.
Findings and implications to practice
We found that the bends in the Drentsche Aa depend on the relative position of the channel to the erodible sandy side or less erodible peaty side. The figure below shows the schematic representation what we called in our publication “oblique aggradation”. Similar studies should be carried out in The Netherlands and around the world to verify the range of stream valley slopes and peat growth rate in which this aggradation type can occur.
Related Content
Publication
- Candel, J. H. J., Makaske, B., Storms, J. E. A., & Wallinga, J. (2017). Oblique aggradation: a novel explanation for sinuosity of low-energy streams in peat-filled valley systems. Earth Surface Processes and Landforms, 42(15), 2679–2696. https://doi.org/10.1002/esp.4100.
- Here is available the full list of related conference abstracts related to this project.
(Under) Graduate thesis
- Moedt, E.H. (2017). “Saalian-Holocene dynanmics of the Drentsche Aa valley system”. MSc. thesis, Wageningen University & Research.
Dataset access
Dataset contains: (1) GPR data from Drentsche Aa at the locations Amen, Loon, Gasteren2 and Schipborg. (2) Coring data and LLG software (©Utrecht University) to open coring data. (3) Radiocarbon (14C) data. and (4) Optically stimulated luminescence (OSL) dating results. Dateset is temporary stored in DataVerse https://dataverse.nl/dataset.xhtml?persistentId=hdl:10411/J3W4IS.
Related outputs
Change from a laterally stable to meandering river – a reconstruction of the historical discharge
We show how the Overijsselse Vecht river changed from a laterally stable to a meandering river ca. 500 years ago and further developed a methodology to reconstruct the historical discharge.
31/08/2018 by Jasper Candel et al.
Contains: Dataset access Publication open access
Last modified: 30/01/2019
How do bends form in peat-land streams?
We propose a conceptual model to explain the origin of bends in peatland streams to better inform stream restoration.
Jasper Candel
Wageningen University & Research
Anything to ask or share?
About usWe would like to learn from your experience or questions to further take this knowledge into practice in the Netherlands and abroad. Your feedback will help us to know about your interests and how useful the information provided was.