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Article

Effects of Two-Stage Ditch and Natural Floodplains on Sediment Processes Driven by Different Hydrological Conditions

1
Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences (BOKU), 1180 Vienna, Austria
2
Wassercluster Lunz-Biologische Station, 3293 Lunz am See, Austria
*
Author to whom correspondence should be addressed.
Academic Editor: Rui Cortes
Water 2021, 13(15), 2046; https://doi.org/10.3390/w13152046
Received: 27 May 2021 / Revised: 15 July 2021 / Accepted: 23 July 2021 / Published: 27 July 2021
(This article belongs to the Special Issue The Role of Carbon and Nutrient Cycling in Wetlands)
The two-stage ditch is a river restoration technique that aims at improving the sediment regime and lateral channel connectivity by recreating a small floodplain alongside a stream reach. This study aimed to analyze the efficiency of a two-stage ditch in improving the stream sediment structure and functions under different hydrological conditions (baseflow, post-bankfull, post-flood). Stream sediments were collected in channel sections adjacent to the two-stage ditch, adjacent to a natural floodplain along channelized reaches without inundation areas. Grain sizes, organic matter content and phosphorous (P) fractions were analyzed along with functional parameters (benthic respiration rate and P adsorption capacity, EPC0). The reach at the two-stage ditch showed no changes in sediment texture and stocks, while the floodplain reach showed higher fines and organic matter content under all hydrological conditions. The sediments in degraded reaches were more likely to be P sources, while they were more in equilibrium with the water column next to the natural floodplains and the two-stage ditch. Only functional parameters allowed for assessing the restoration effects on improving the sediment stability and functionality. Due to its sensitivity, the use of P adsorption capacity is recommended in future studies aiming at evaluating the response of river sediments to restoration measures under different hydrological conditions. View Full-Text
Keywords: monitoring river restoration; benthic processes; ecosystem functional parameters; benthic respiration rate; fine bed material deposits monitoring river restoration; benthic processes; ecosystem functional parameters; benthic respiration rate; fine bed material deposits
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MDPI and ACS Style

Baldan, D.; Pucher, M.; Akbari, E.; Hein, T.; Weigelhofer, G. Effects of Two-Stage Ditch and Natural Floodplains on Sediment Processes Driven by Different Hydrological Conditions. Water 2021, 13, 2046. https://doi.org/10.3390/w13152046

AMA Style

Baldan D, Pucher M, Akbari E, Hein T, Weigelhofer G. Effects of Two-Stage Ditch and Natural Floodplains on Sediment Processes Driven by Different Hydrological Conditions. Water. 2021; 13(15):2046. https://doi.org/10.3390/w13152046

Chicago/Turabian Style

Baldan, Damiano, Matthias Pucher, Elmira Akbari, Thomas Hein, and Gabriele Weigelhofer. 2021. "Effects of Two-Stage Ditch and Natural Floodplains on Sediment Processes Driven by Different Hydrological Conditions" Water 13, no. 15: 2046. https://doi.org/10.3390/w13152046

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