Publications by Koen Blanckaert

Hydro-sedimentary processes of a plunging hyperpycnal river plume revealed by synchronized remote imagery and gridded current measurements

Ulrich Lemmin, Koen Blanckaert, David Andrew Barry

The present knowledge of plunging hyperpycnal river plumes is mainly based on two-dimensional (confined) laboratory experiments. Several hypotheses on three-dimensional (unconfined) flow processes have been made, but not tested in situ. In this field study ...

American Geophysical Union2024

Unconfined Plunging of a Hyperpycnal River Plume Over a Sloping Bed and Its Lateral Spreading: Laboratory Experiments and Numerical Modeling

Ulrich Lemmin, Koen Blanckaert, David Andrew Barry, Haoran Shi

Hyperpycnal (negatively buoyant) river inflow into lakes and oceans often develops three-dimensional (3D) plunging flow patterns when laterally unconfined. To determine the 3D flow pattern characteristics, laboratory experiments of laterally unconfined plu ...

American Geophysical Union2022

Measuring Bedload Sediment Transport with an Acoustic Doppler Velocity Profiler

Koen Blanckaert, Joris Heyman

Acoustic Doppler velocity profilers (ADVP) measure the velocity simultaneously in a linear array of bins. They have been successfully used in the past to measure three-dimensional turbulent flow and the dynamics of suspended sediment. The capability of ADV ...

Asce-Amer Soc Civil Engineers2017

A parametrical study on secondary flow in sharp open-channel bends: experiments and theoretical modelling

Koen Blanckaert, Anton Schleiss, Joris Heyman

The dependence of curvature-induced secondary flow on the curvature ratio H/R (H is the average flow depth and R is the centreline radius of curvature), the Froude number Fr, and the dimensionless roughness coefficient Cf was systematically investigated in ...

Elsevier Science Bv2016

Modeling Flow Pattern and Evolution of Meandering Channels with a Nonlinear Model

Koen Blanckaert

Meander dynamics has been the focus of river engineering for decades; however, it remains a challenge for researchers to precisely replicate natural evolution processes of meandering channels with numerical models due to the high nonlinearity of the govern ...

Mdpi Ag2016

Local tributary widening for river rehabilitation

Koen Blanckaert, Anton Schleiss, Marcelo Leite Ribeiro

The hydro-morpho-sedimentary processes in confluence hydrodynamic zones (CHZ) subject to a local widening of the tributary were investigated in a series of laboratory experiments that were representative of the 20 major confluences of the Upper Rhone River ...

John Wiley and Sons2016

Flow separation at convex banks in open channels

Koen Blanckaert

Laboratory experiments in an open channel bend provide insight into the physics of convex bank flow separation occurring in a variety of channel configurations, including confluences and bifurcations. The edge of the zone of flow separation is characterize ...

Cambridge University Press2015

Dynamic investigation of nutrient consumption and injection strategy in microbial enhanced oil recovery (MEOR) by means of large-scale experiments

Koen Blanckaert

Microbial enhanced oil recovery (MEOR) depends on the in situ microbial activity to release trapped oil in reservoirs. In practice, undesired consumption is a universal phenomenon but cannot be observed effectively in small-scale physical simulations due t ...

Springer2015

Secondary flow in sharp open-channel bends: experiments and modelling

Koen Blanckaert, Anton Schleiss, Joris Heyman

The dependence of curvature-induced secondary flow on the curvature ratio H/R and the Froude number Fr was systematically investigated in a series of 18 experiments in a sharply-curved laboratory flume. The investigated flow depths were 0.9 m, 0.13 m, 0.19 ...

2015

Experiments of flow separation at the inner bank of open-channel bends

Koen Blanckaert, Anton Schleiss, Joris Heyman

In spite of its hydraulic and morphologic importance, the conditions of occurrence of flow separation at the inner bank of open channel bends are still not known. In a series of 23 experiments in a laboratory open channel bend with flat sand bed, it was in ...

2015

Influencing Flow Patterns and Bed Morphology in Open Channels and Rivers by Means of an Air-Bubble Screen

Koen Blanckaert, Anton Schleiss, Violaine Dugué

The ability of a bubble screen to redistribute the flow field and bed morphology in shallow rivers and open channels has been investigated in laboratory experiments. Rising air bubbles generated by a pressurized porous tube situated on the bed induced seco ...

American Society of Civil Engineers2014

Water Saving and Energy Reduction through Pressure Management in Urban Water Distribution Networks

Koen Blanckaert, Qiang Xu

Water shortages and climate change are worldwide issues. Reduction in water leakage in distribution networks as well as the associated energy saving and environmental impacts have recently received increased attention by scientists and water industries. Pr ...

Springer2014

Preface Ecohydraulics: linkages between hydraulics, morphodynamics and ecological processes in rivers

Koen Blanckaert

The articles in this issue are a selection of the 15 main presentations made at the EUROMECH Colloquium 523 'Ecohydraulics: linkages between hydraulics, morphodynamics and ecological processes in rivers' that was organized in Clermont-Ferrand, France, from ...

Wiley-Blackwell2013

A method for assessing the feasibility of air-bubble screens to reduce morphological gradients in open-channel bends

Koen Blanckaert, Anton Schleiss, Violaine Dugué

Within the fluvial network, confluences are particular areas characterized by great ecological value where flow dynamics and bed morphology are much influenced by local patterns. The aim of this article is to describe the influence of the convergence angle ...

TPU2013

Reduction of bend scour with an air-bubble screen - morphology and flow patterns

Koen Blanckaert, Anton Schleiss, Violaine Dugué

The interplay between streamwise flow, curvature-induced secondary flow, sediment transport and bed morphology leads to the formation of a typical bar-pool bed morphology in open-channel bends. The associated scour at the outer bank and deposition at the i ...

Irtces2013

Optimizing the operation of the Qingshitan Reservoir in the Lijiang River for multiple human interests and quasi-natural flow maintenance

Koen Blanckaert

For reservoir operation, maintaining a quasi-natural flow regime can benefit river ecosystems, but may sacrifice human interests. This study took the Qingshitan Reservoir in the Lijiang River as a case, and developed an optimization model to explore a trad ...

2012

Optimization of water quality monitoring network in large river by combining measurements, a numerical model and matter-element analysis

Koen Blanckaert

A monitoring network that resolves the spatial and temporal variations of the water quality is essential in the sustainable management of water resources and pollution control. Due to cost concerns, it is important to optimize the monitoring locations so t ...

Academic Press Ltd- Elsevier Science Ltd2012

Discussion of "Three-dimensional numerical study of flow structure in channel confluences"

Koen Blanckaert, Anton Schleiss, Marcelo Leite Ribeiro

The Discussers would like to congratulate the Authors for their interesting work concerning the flow characteristics in channel confluences, performed by means of three-dimensional numerical simulations considering rectangular crosssections with smooth bed ...

National Research Council Canada2011

Topographic steering, flow recirculation, velocity redistribution, and bed topography in sharp meander bends (vol 46, W11901, 2010)

Koen Blanckaert

American Geophysical Union2010

Saturation of curvature-induced secondary flow, energy losses, and turbulence in sharp open-channel bends: Laboratory experiments, analysis, and modeling

Koen Blanckaert

The paper investigates the influence of relative bend curvature on secondary flow, energy losses, and turbulence in sharp open-channel bends. These processes are important in natural streams with respect to sediment transport, the bathymetry and planimetry ...

2009