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Li, Wei (author), Zhu, Lehong (author), Xie, Guohu (author), Hu, Peng (author), de Vriend, H.J. (author)The past decades have witnessed frequent flood peak discharges increase in the Lower Yellow River (LYR). Yet no consensus for its mechanism has been achieved. Here 21 events of the peak discharge increase (PDI) in the period of 1973–2012 are analysed. It is shown that the mean increment of peak discharge increases from 810 m<sup>3</sup>/s to...journal article 2022
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Li, W. (author), Su, Zhenghua (author), van Maren, D.S. (author), Wang, Zhengbing (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
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van Vuren, S. (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
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- de Vriend, H.J. (author), Havinga, H. (author), Visser, P.J. (author), Wang, Z.B. (author) lecture notes 2006
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- Stive, M.J.F. (author), de Vriend, H.J. (author), Dronkers, J. (author), van Dongeren, A. (author), Wang, Z.B. (author) lecture notes 2006
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De Vriend, H.J. (author), Dronkers, J. (author), Stive, M.J.F. (author), Van Dongeren, A. (author), Wang, J.H. (author)lecture note: Tidal inlets and their associated basins (lagoons) are a common feature of lowland coasts all around the world. A significant part ofthe world's coastlines is formed by barrier island coasts, and most other tidal coasts are interrupted by estuaries and lagoon inlets. These tidal systems play a crucial role in the sediment budget...lecture notes 2002
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- De Vriend, H.J. (author) lecture notes 1998
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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
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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
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- de Vriend, H.J. (author), Dronkers, J. (author), Stive, M.J.F. (author), van Dongeren, A. (author), Wang, Z.B. (author) lecture notes 2005
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- De Vriend, H.J. (author) public lecture 1997
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De Vriend, H.J. (author), Reinalda, R. (author), Derks, H. (author)The 1981 and 1982/1983 field measurement campaigns in the nearshore zone at Egmond, The Netherlands, are outlined and the access to the resulting data sets is indicated. Besides, the use of these data for mathematical model validation is discussed and some general remarks are made on the set-up of synoptic field campaigns to generate data sets...report 1987
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De Vriend, H.J. (author)The relationship between streamline curvature and bed resistance in shallow water flow with little side constraint, as derived in 1970 by H.J. Schoemaker, is reconsidered. Schoemaker concluded that the bed resistance causes the curvature of a free streamline to grow exponentially with the distance along this streamline, thus giving rise to a...report 1979
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De Vriend, H.J. (author), Geldof, H.J. (author)Results of a mathematical model for the depth-averaged main flow velocity in shallow river bends are compared with measurements in two consecutive sharply-curved short bends in the river Dommel, The Netherlands. The computed main velocity distribution agrees rather well with the measured one in the larger part of each bend. Near the bend exits,...report 1983
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De Vriend, H.J. (author)As an intermediate step between earlier investigations on fully developed laminar flow in curved channels of shallow rectancular wet cross-section and the mathematical modeling of turbulent flow in river bends, a mathematical model of developing laminar flow in such channels is investigated. The most important assumptions made in addition to...report 1978
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De Vriend, H.J. (author)A mathematical model of steady, fully developed laminar flow in curved ducts is developed and used to derive a simplified computation method to be applied in another mathematical model predicting the flow in river bends. The laminar flow model is verified by comparing its results with analytical, numerical and experimental results reported in...report 1978
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De Vriend, H.J. (author)The present lecture deals with models for situations in which the spatial dimensions cannot be separated according to the scales of the morphological processes. Rather common examples of such situations are the morphological evolution near structures (e.g, breakwaters), river outflows, tidal inlets, etc. But also in the absence of such distinct...report 1992
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De Vriend, H.J. (author)This report describes an extensive experiment on steady turbulent flow in a rather sharply curved U-shaped flume with a shallow rectangular cross-section, under almost the same conditions as earlier, less extensive measurements in the same flume. The experiment was carried out as a part of a research project aiming at a mathematical model of the...report 1979
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De Vriend, H.J. (author)Het probleem van de stroming in een rivierbocht is door ir. M.B. de Groot geabstraheerd tot het probleem van de stroming in een cilindrische bak met verticale as, afgesloten met een om die as draaiend, vlak deksel. Een nadeel van de bovengenoemde abstractie is, dat men overgaat op een fundamenteel ander aandrijvend mechanisme: de schuifspanning...report 1971
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De Vriend, H.J. (author), Koch, F.G. (author)I: Flow of water in a curved open channel with a fixed plane bed II: Flow of water in a curved open channel with a fixed uneven bed III: Accuracy of measurements in a curved open channel In this report the flow of water in a curved open channel, which consists of a38 m long straight section followed by a 90° bend with a radius of 50 m (see...report 1987