Pepijn van Denderen

Pepijn van Denderen
HKV Consultants | HKV · Rivers Coasts and Delta's

PhD

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12
Publications
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64
Citations

Publications

Publications (12)
Article
Full-text available
The river bed level in low-land rivers like the Rhine branches in The Netherlands changes continuously on various spatial and temporal scales. Large-scale degradation occurs in many rivers due to river-wide engineering interventions, such as channelization, in the last decades and centuries. Local river interventions, such as the construction of si...
Chapter
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Human interventions can result in changes in the equilibrium profile of rivers. It is difficult to identify the bed level changes that result from river interventions due to the various causes of bed level changes. Using wavelet filtering, we are able to isolate the effect of river interventions based on the length scale over which they occur. The...
Article
Full-text available
A growing number of scientific publications is available to promote sustainable river management. However, these publications target researchers rather than water management professionals who are responsible for the implementation of management practices. To bridge this science-to-practice gap, we conceptualize and propose a series of steps to prep...
Conference Paper
Full-text available
River interventions that are designed to re- duce the flood levels in the river or to in- crease the ecological value of the river, gener- ally cause aggradation in the navigation chan- nel. Such interventions withdraw discharge from the main channel and this reduces the sediment transport capacity. The reduced sed- iment transport capacity is comp...
Conference Paper
Full-text available
Side channels are small secondary channels that are generally connected to the main channel at both ends. Side channels are (re)constructed to reduce the flood risk and to increase the ecological value of a river. Many such artificial side channels quickly aggrade (Riquier et al., 2015; Van Denderen et al., 2019) and therefore costly maintenance is...
Article
Full-text available
Side channels are commonly constructed to reduce the flood risk or to increase the ecological value of a river. Such artificial side channels generally aggrade. We categorize the development of side channels based on the sediment that is deposited in these channels. Based on this categorization, we determine the main mechanisms that affect their de...
Thesis
Full-text available
Side channels are commonly constructed to increase the discharge capacity of a river during peak flow conditions or to increase the ecological value of the river. Observations show that large aggradation occurs in the side channels. Therefore, such channels require regular and costly maintenance. The aim of this research is to better understand the...
Article
Side channel construction is a common intervention to increase both flood safety and the ecological value of the river. Three side channels of Gameren in the river Waal (The Netherlands) show amounts of large aggradation. We use bed level measurements and grain size samples to characterize the development of the side channels. We relate the bed lev...
Conference Paper
Full-text available
Measuring and modelling the development of side channels
Conference Paper
Full-text available
Side channels are a common intervention to reduce the flood levels or to increase the ecological value in the river. Most of the constructed side channels ag-grade. We apply a simple method to estimate the development and its time scale of a side channel system.
Article
Full-text available
Side channel construction is a common intervention applied to increase the river's conveyance capacity and to increase its ecological value. Past modelling efforts suggest two mechanisms affecting the morphodynamic change of a side channel: 1) a difference in channel slope between the side channel and the main channel and 2) bend flow just upstream...
Conference Paper
Full-text available
Side channels are popular methods to reduce flood levels or to increase the ecological value of rivers. Here we asses four side channels in the River Ain (France). In combination with 1D model simulations, we identify the characteristics and processes regarding the erosion and sedimentation patterns. The relative slope of the channels, the bifurcat...

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Projects

Projects (2)
Project
Side channels are commonly constructed to increase the discharge capacity of a river during peak flow conditions or to increase the ecological value of the river. Observations show that large aggradation occurs in the side channels. Therefore, such channels require regular and costly maintenance. The aim of this research is to better understand the mechanisms that drive the morphodynamic development of side channels and thereby, improve the design of side channels and reduce their maintenance needs. We studied the development of side channel in various ways and found that mechanisms such as a length difference between the downstream channels, sediment sorting at the bifurcation and varying hydrodynamic conditions have a large effect on the morphodynamic development of a side channel system. The mechanisms that are important are not the same for each side channel and can vary in time. Therefore, we propose three categories of side channel based on how the sediment that is deposited in the side channel is transported in the main channel: (1) bed load supplied, (2) suspended bed-material load supplied and (3) wash load supplied side channels. These categories can help in determining the main mechanisms that affect the development of a side channel system. In addition, we propose a method based on the categorization that can aid the design, operation and maintenance of side channels.
Project
RiverCare (http://www.ncr-web.org/rivercare/about) is a Dutch research program. 21 researchers at 5 universities collaborate with knowledge institutes, consultancies and government organizations. RiverCare aims at better understanding the fundamental processes that drive eco-morphological changes in rivers, predict the intermediate and long-term developments. We use that knowledge to improve river governance, reduce maintenance costs and increase benefits of river interventions. We want to put our knowledge into practice not only in the Netherlands but also abroad.