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Citations since 2017
9 Research Items
Systematic identification and characterization of bedforms from bathymetric data are crucial in many studies of fluvial processes. Automated and accurate processing of bed elevation data is challenging where dune fields are complex or irregular and (especially) where multiple scales co-exist. Here, we introduce a new tool to quantify dune propertie...
This paper shares an Early-Career Scientist (ECS) perspective on potential themes for the upcoming International Association of Hydrological Sciences (IAHS) scientific decade (SD). Six discussion sessions were organised in four countries in western Europe in spring 2022. Early-career hydrologists were invited to join the sessions to formulate poten...
Systematic identification and characterization of bedforms from bathymetric data are crucial in many studies focused on fluvial processes. Automated and accurate processing of bed elevation data is challenging where dune fields are complex, irregular and, especially, where multiple scales co-exist. Here, we introduce a new tool to quantify dune pro...
Subaqueous dunes are fascinating morphological features that occur in diverse environments such as the deep sea, continental shelves and inland streams or rivers. Due to their rhythmic and oftentimes very frequent distribution along the predominant flow direction, the analysis of these bedforms is usually assigned to bedform identification tools. S...
Trains of secondary bedforms, superimposed on primary dunes, have been observed in rivers worldwide. To date, it has remained unclear how these secondary bedforms affect the sediment transport dynamics in a fluvial system. In this study, a field campaign was conducted to acquire a data set with a high spatial and temporal resolution, enabling to tr...
Submerged vanes alter sediment transport by inducing a secondary circulation without significantly compromising the conveyance capacity of the river. Here, a laboratory study is conducted to investigate whether wood logs or trunks can be used for sediment management. The effectivity of a traditional vane field is compared to set-ups with screens of...
Understanding river morphodynamics and accurate prediction models are essential to address current and future challenges in lowland river management in the face of climate change and sea level rise. A basis for both is information about sediment fluxes, which remains scarce. The aim of this research is to improve the quantification of sediment transport in lowland rivers. The focus is both on the use of acoustics to measure suspended and bedload sediment and on the estimation through transport equations in relation to bedforms. The first objective is to improve the estimation of suspended sediment from ADCP backscatter in rivers with mixtures of sand and mud, where fine sediment attenuates the acoustic signal. A second focus is on superimposed bedforms and low-angled river dunes. Little is known about the occurrence and effect of superimposed bedforms on flow and sediment transport processes. We question whether trains of superimposed bedforms form an additional means of bedload transport, which would have implications for the measurement of bedload transport through dune tracking. This is determined through measurements with a fixed, high-resolution multibeam installed in the Dutch IJssel River. The third objective is to identify which variables and processes determine the morphology and migration of low-angle dunes, including the bed grain size distribution and suspended sediment dynamics based on available MBES and ADCP monitoring data, as well as additional field campaigns in the Dutch IJssel River. Finally, we will evaluate and improve sediment transport equations for the lower Dutch delta based on the obtained field evidence.