Flow structures; Large wood; River restoration; Sediment transport
Follett E., Schalko I., Nepf H. (2021), Logjams With a Lower Gap: Backwater Rise and Flow Distribution Beneath and Through Logjam Predicted by Two‐Box Momentum Balance, in Geophysical Research Letters
, 48(16), 1-10.
Friedrich Heide, Ravazzolo Diego, Ruiz‐Villanueva Virginia, Schalko Isabella, Spreitzer Gabriel, Tunnicliffe Jon, Weitbrecht Volker (2021), Physical modelling of large wood (LW) processes relevant for river management: Perspectives from New Zealand and Switzerland, in Earth Surface Processes and Landforms
SchalkoIsabella, NepfHeidi, WohlEllen (2021), Flow and wake characteristics associated with large wood to inform river restoration, in Scientific Reports
, 11(8644 ), 1-12.
Follett E., Schalko I., Nepf H. (2020), Momentum and Energy Predict the Backwater Rise Generated by a Large Wood Jam, in Geophysical Research Letters
, 47(17), 1-10.
Schalko Isabella, NepfNepf (2020), How to design wood accumulation patches to increase flow variability and deposition – a flume study, in River Flow 2020
, DelftCRC Press, London.
Numerous rivers have been confined and are eco-morphologically impaired, resulting in an increased demand for river restoration projects. Wood placements are a common and inexpensive measure for river restoration. A wood accumulation patch (WAP) is herein defined as an accumulation of less than 20 logs. To plan and evaluate river restoration projects including WAPs, it is important to understand the interactions between flow, wood, and sediment. The number of investigations on the role of wood for restoration projects has considerably increased within the past decades. The majority of the studies were conducted for a specific field site, or focused mainly on engineered log jams. The influence of various flow conditions and bed material on flow and morphological structures in the vicinity of WAPs have not been studied so far. In addition, flow features within an accumulation are still unknown. The main goals of this post-doctoral research project can therefore be described as follows:(1)Quantify flow and morphological structures associated with wood accumulation patches(2)Investigate flow structures within a wood accumulation patch(3)Derive design recommendations for wood accumulation patchesThis project tackles the described goals using physical modeling and is divided into three phases. The objective is to provide data and describe WAP characteristics and respective flow structures that can be linked to desirable river conditions (e.g. fish habitat preferences). These data will allow for a comparison with field and numerical data. For the design recommendations, special emphasis will be put on maintenance and the application for mountain streams. Overall, this project aims to enhance the understanding of hydrodynamic and morphological processes associated with wood accumulations to allow for successful and sustainable river restoration projects.