Searched for: author:"De Vriend, H.J."
(1 - 20 of 69)

Pages

document
Li, W. (author), Su, Zhenghua (author), van Maren, D.S. (author), Wang, Z.B. (author), de Vriend, H.J. (author)
The downstream peak discharge increase during hyperconcentrated floods in the Yellow River has been attributed to bed erosion, roughness reduction and floodplain effects. While great improvements have been made on the nderstandings of the roles of bed erosion and roughness reduction, the effects of floodplain remain poorly understood. Here, as a...
journal article 2017
document
van Vuren, B.G. (author), de Vriend, H.J. (author), Barneveld, Hermjan (author)
Over the course of centuries, river systems have been heavily trained for the purpose of safe discharge of water, sediment and ice, and improves navigation. Traditionally, dikes are used to be reinforced and heightened to protect countries from ever higher flood levels. Other types of solutions than technical engineering solutions, such as...
journal article 2016
document
Maan, D.C. (author), van Prooijen, B.C. (author), Wang, Z.B. (author), de Vriend, H.J. (author)
Various studies have identified a strong relation between the hydrodynamic forces and the equilibrium profile for intertidal flats. A thorough understanding of the interplay between the hydrodynamic forces and the morphology, however, concerns more than the equilibrium state alone. We study the basic processes and feedback mechanisms underlying...
journal article 2015
document
De Vriend, H.J. (author)
Rivers respond to changes in their geometry or their controls in various ways and at a wide range of space and time scales. The response consists of changes in properties such as cross-sectional shape and area, slope, planform pattern, bed roughness and bed sediment composition. Usually, attention for the morphological impact of engineering...
journal article 2015
document
Li, W. (author), Wang, Z.B. (author), Van Maren, D.S. (author), De Vriend, H.J. (author), Wu, B.S. (author)
River floods are usually featured by a downstream flattening discharge peak whereas a downstream increasing discharge peak is observed at a rate exceeding the tributary discharge during highly silt-laden floods (hyperconcentrated floods) in China’s Yellow River. It entails a great challenge in the downstream flood defence and the underlying...
journal article 2014
document
De Vriend, H.J. (author), Van Koningsveld, M. (author), Aarninkhof, S. (author)
The Netherlands has adopted a new, proactive approach to developing its extensive coastal and river works called ‘building with nature’. Rather than simply minimising or mitigating the environmental impact of harbours, navigation channels, land reclamation and flood defences, the idea is to make use of the dynamics of the natural environment and...
journal article 2014
document
Nabi, M. (author), De Vriend, H.J. (author), Mosselman, E. (author), Sloff, C.J. (author), Shimizu, Y. (author)
We present a 3-D physics-based high-resolution modeling approach to the dynamics of underwater ripples and dunes. The flow is modeled by large eddy simulation on a Cartesian grid with local refinements. The sediment transport is modeled by computing pickup, transport over the bed, transport in the water column, and deposition of rigid spherical...
journal article 2013
document
Nabi, M. (author), De Vriend, H.J. (author), Mosselman, E. (author), Sloff, C.J. (author), Shimizu, Y. (author)
The paper describes a numerical model for simulating sediment transport with eddy-resolving 3-D models. This sediment model consists of four submodels: pickup, transport over the bed, transport in the water column and deposition, all based on a turbulent flow model using large-eddy simulation. The sediment is considered as uniform rigid...
journal article 2013
document
Li, W. (author), De Vriend, H.J. (author), Wang, Z. (author), Van Maren, D.S. (author)
High-resolution morphological modeling of fluvial processes with complex, rapidly varying flows has been limited so far by model accuracy or computational efficiency. One of the most widely used numerical algorithms is based on the total variation diminishing method, solved by either upwind or centered approaches. An upwind scheme preserves high...
journal article 2013
document
Ottevanger, W. (author), Blanckaert, K. (author), Uijttewaal, W.S.J. (author), De Vriend, H.J. (author)
Reduced-order models remain essential tools for meander modeling, especially for processes at large length scales and long time scales, probabilistic simulations, rapid assessments, or when input data are scarce or uncertain. Present reduced-order meander models consider their dependent variables either as small-amplitude variations compared to...
journal article 2013
document
Wang, Z.B. (author), De Vriend, H.J. (author), Ding, P. (author)
conference paper 2013
document
Li, W. (author), Wang, Z.B. (author), Van Maren, D.S. (author), De Vriend, H.J. (author), Wu, B.S. (author)
conference paper 2013
document
De Vriend, H.J. (author), Van Koningsveld, M. (author)
book 2012
document
Nabi, M. (author), De Vriend, H.J. (author), Mosselman, E. (author), Sloff, C.J. (author), Shimizu, Y. (author)
We present a three-dimensional high-resolution hydrodynamic model for unsteady incompressible flow over an evolving bed topography. This is achieved by using a multilevel Cartesian grid technique that allows the grid to be refined in high-gradient regions and in the vicinity of the river bed. The grid can be locally refined and adapted to the...
journal article 2012
document
Van Raalte, G.H. (author), Van Koningsveld, M. (author), Fiselier, J. (author), De Vriend, H.J. (author), Rijks, D. (author)
Working in coastal planning is nearly always innovative, since no two coasts are the same. Even if they appear to be physically similar, local conditions and governance settings are usually different, thus requiring a different approach. Each project is unique, which makes coastal projects exciting and diverse.
conference paper 2011
document
De Vriend, H.J. (author), Wang, Z.B. (author), Ysebaert, T. (author), Herman, P.M.J. (author), Ding, P. (author)
This paper compares the Yangtze Estuary in China and the Western Scheldt Estuary in The Netherlands by their morphodynamic and ecological systems, their engineering works and estuarine management issues, and the major challenges in studying them. Physically speaking, the two estuaries are very different. The Yangtze Estuary is much larger and...
journal article 2011
document
De Vriend, H.J. (author)
Climate change and a river’s response to it are likely to be slow processes as compared to the responses to direct human interventions such as engineering works. Therefore, we have to look at timescales of centuries. Such timescales are difficult to be covered by numerical models and, moreover, uncertainties are so large that the degree of...
conference paper 2011
document
de Vriend, H.J. (author), Havinga, H. (author), van Prooijen, B.C. (author), Visser, P.J. (author), Wang, Z.B. (author)
In this syllabus an overview is given of the basic knowledge, which is required to prepare interventions in rivers and to estimate the consequences of these interventions. The utilization of the river for human purposes and the knowledge of hydraulics, sediment transport and morphology will be treated. At the end of this syllabus some practice...
lecture notes 2011
document
de Vriend, H.J. (author), Havinga, H. (author), van Prooijen, B.C. (author), Visser, P.J. (author), Wang, Z.B. (author)
Deze syllabus beoogt een overzicht te geven van de basiskennis die nodig is om ingrepen in de rivier voor te bereiden en de gevolgen ervan te kunnen inschatten. Er wordt ingegaan op het gebruik dat de mens maakt van de rivier en op de kennis van de hydraulica, het sedimenttransport en de morfologie. Aan het einde van het dictaat worden...
lecture notes 2011
document
Blanckaert, K. (author), De Vriend, H.J. (author)
Despite the rapid evolution of computational power, simulation of meander dynamics by means of reduced and computationally less expensive models remains practically relevant for investigation of large?scale and long?term processes, probabilistic predictions, or rapid assessments. Existing meander models are invariantly based on the assumptions...
journal article 2010
Searched for: author:"De Vriend, H.J."
(1 - 20 of 69)

Pages