Scour Manual: Current-Related Erosion

Mr. Hoffmans has more than 30 years of professional experience in the field of scour, internal erosion, river engineering, dike and dam engineering and flood protection projects and has acted several times as Expert as well as Project Manager. He started his career as a research engineer regarding scour and erosion and the corresponding geotechnical processes. In addition, he examined the erodibility of both bed protections around hydraulic structures in non-uniform flow conditions, and revetments at dikes, for example grass covers. With this up-to-date knowledge he advised several clients all over the world with designing and assessing hydraulic structures. His design experience has been gained in various countries and covers the river training works and its geotechnical engineering and stability aspects. More specifically, this experience also focused on hydraulic structures such as estimating the dimensions of scour holes in relation to the magnitude of bed protection and the risks of shear failures and/or flow slides, considering several types of scour. The combination of research and project-related advice on site has increased his insight in the mathematical modelling of internal erosion phenomena, especially piping. He is author of several manuals and of more than 50 publications.

Mr. Henk Verheij graduated in 1978 at Delft University of Technology in Civil Engineering (M.Sc.) and, subsequently, joined Delft Hydraulics (now Deltares) until his retirement in 2014. From 2006 till mid 2020 he was lecturer Ports & Waterways at the Delft University. Mr. Henk Verheij is a senior hydraulic engineer in the fields of dikes, embankments, hydraulic structures, ship-induced water motions, revetments and scour and its effects on the stability of bed protections, embankments and dikes along canals and rivers. He has experience with small-scale models as well as full-scale prototype investigations. He participated in research on dike breaches in cohesive materials, environmental-friendly protection methods, strength of grass dikes by overtopping tests, and reed as protection material. The expertise of Mr. Henk Verheij is being used for preparing guidelines and manuals for filter design, river dike revetments, scour, and the safety against flooding. He published over 50 papers, and is co-author of PIANC report 180 Guidelines for protecting berthing structures from scour caused by ships.