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Accuracy Assessment of Numerical Morphological Models Based on Reduced Saint-Venant Equations

Barneveld, H.J. (author), Mosselman, E. (author), Chavarrías, V. (author), Hoitink, A.J.F. (author)

Sustainable river management often requires long-term morphological simulations. As the future is unknown, uncertainty needs to be accounted for, which may require probabilistic simulations covering a large parameter domain. Even for one-dimensional models, simulation times can be long. One of the acceleration strategies is simplification of...

journal article 2024

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Can linear stability analyses predict the development of riverbed waves with lengths much larger than the water depth?

Barneveld, H.J. (author), Mosselman, E. (author), Chavarrías, Víctor (author), Hoitink, A.J.F. (author)

Sustainable river management can be supported by models predicting long-term morphological developments. Even for one-dimensional morphological models, run times can be up to several days for simulations over multiple decades. Alternatively, analytical tools yield metrics that allow estimation of migration celerity and damping of bed waves,...

journal article 2023

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Implementation of a New Bank Erosion Model in Delft3D

Parsapour-Moghaddam, Parna (author), Rennie, Colin David (author), Slaney, Jonathan (author), Platzek, Frank (author), Shirkhani, Hamidreza (author), Jamieson, Elizabeth (author), Mosselman, E. (author), Measures, Richard (author)

Bank erosion plays an important role in the hydro-morphodynamics and evolution of natural rivers. Therefore, it is essential to have a reliable bank erosion model for accurate simulation of hydro-morphodynamic processes. We developed and successfully implemented a new, feasible bank erosion model in Delft3D software. The developed model...

journal article 2023

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Modelling morphodynamic development in the presence of immobile sediment

Chavarrías, Víctor (author), Ottevanger, Willem (author), Sloff, C.J. (author), Mosselman, E. (author)

Predicting the formation and break-up of immobile layers is of crucial importance for river management, as these processes greatly affect the morphodynamic evolution of the river bed. Two models are currently available for studying these processes: Struiksma's and Hirano's model. In this paper, we show that both models present limitations. This...

journal article 2022

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The Dutch Rhine branches in the Anthropocene – Importance of events and seizing of opportunities

Mosselman, E. (author)

The Rhine branches in the Netherlands have been profoundly altered by human interventions in the past 2000 years. Three examples are elaborated to show that these alterations often result from specific events and the seizing of opportunities: the creation of a new Rhine bifurcation at Pannerden, the Room-for-the-River programme, and the...

journal article 2022

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Stabilization of the Lower Jamuna River in Bangladesh: Hydraulic and Morphological Assessment

Giri, Sanjay (author), Thompson, Angela (author), Donchyts, Gennady (author), Oberhagemann, Knut (author), Mosselman, E. (author), Alam, Jahagir (author)

This paper presents a hydraulic and morphological analysis of the Lower Jamuna in Bangladesh with a focus on two key bifurcations that are important for stabilization of the Lower Jamuna reach. We used ground measurements, historical data, multispectral satellite images from various sources as well as numerical models. We carried out hydraulic...

journal article 2021

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The Effect of Small Density Differences at River Confluences

van Rooijen, Erik (author), Mosselman, E. (author), Sloff, C.J. (author), Uijttewaal, W.S.J. (author)

Remarkable 3D flow structures occur at river confluences with small density differences due to differences in sediment concentration or temperature. We explain these by comparing numerical simulations for an idealized confluence with aerial photographs of several river confluences where color differences express the pattern of density...

journal article 2020

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Klimaatadaptatie in het rivierengebied: Een geo-ecologisch perspectief.

Klijn, F. (author), Asselman, Nathalie (author), Mosselman, E. (author), Sperna Weiland, Frederiek (author)

Door klimaatverandering verandert het afvoerregime van onze grote rivieren. Hoogwaters worden hoger en frequenter, laagwaters lager en langduriger. Hoe we daarop reageren hangt af van hoe we klimaatverandering zien: als opgave, of als kans om onvolkomenheden aan te pakken. In dit artikel presenteren we aanzetten voor een meer geo-ecologisch...

journal article 2019

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Sediment budget analysis of the Guayas River using a process-based model

Barrera Crespo, Pedro D. (author), Mosselman, E. (author), Giardino, Alessio (author), Becker, Anke (author), Ottevanger, Willem (author), Nabi, Mohamed (author), Arias Hidalgo, Mijail (author)

The equatorial Daule and Babahoyo rivers meet and combine into the tidal Guayas River, which flows into the largest estuary on the Pacific coast of South America. The city of Guayaquil, located along the Guayas, is the main port of Ecuador but, at the same time, the planet's fourth most vulnerable city to future flooding due to climate change....

journal article 2019

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On the stability of river bifurcations created by longitudinal training walls: Numerical investigation

Le, T.B. (author), Crosato, A. (author), Mosselman, E. (author), Uijttewaal, W.S.J. (author)

To maintain a navigable channel and improve high-flow conveyance, engineers have recently proposed constructing longitudinal training walls as an alternative to the traditional transverse groynes. However, previous work has shown that the system of parallel channels created by a longitudinal training wall might be unstable in rivers with...

journal article 2018

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Robust river systems: on assessing the sensitivity of embanked rivers to discharge uncertainties, exemplified for the Netherlands' main rivers

Klijn, F. (author), Asselman, Nathalie (author), Mosselman, E. (author)

There is increasing attention for the robustness of systems, in view of more frequent and more extreme weather events. Calls to increase a system's robustness are usually motivated by the resulting reduced sensitivity to extreme events and uncertainties about their probability of occurrence. The concept has been elaborated for flood risk systems...

journal article 2018

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Five common mistakes in fluvial morphodynamic modeling

Mosselman, E. (author), Le, T.B. (author)

Recent years have seen a marked increase in the availability of morphodynamic models and a proliferation of new morphodynamic codes. As a consequence, morphodynamic models are increasingly developed, used and evaluated by non-experts, possibly leading to mistakes. This paper draws attention to five types of common mistakes. First, new...

journal article 2016

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Sedimentacion obstruye el Rio Guayas

De Keizer, O. (author), Mosselman, E. (author)

journal article 2015

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A review of assessment methods for river hydromorphology

Beletti, B. (author), Rinaldi, M. (author), Buijse, A.D. (author), Gurnell, A.M. (author), Mosselman, E. (author)

Numerous hydromorphological assessment methods have been developed in different countries during recent decades, with notable differences in their aims, scales, and approaches. Although these methods are increasingly applied to support river management, the strengths and limitations have been insufficiently investigated. This review of 121...

journal article 2014

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Veldexperiment in de Hooge Raam: Winst voor beekherstel én wetenschap

Eekhout, J.P.C. (author), Hoitink, A.J.F. (author), Mosselman, E. (author), Kits, M. (author), Talsma, M. (author)

In de beek de Hooge Raam is een beekherstelproject gekoppeld aan een uniek veldexperiment. Het doel van het veldexperiment was om over een periode van drie jaar de temporele morfodynamiek te volgen van een rechte beekloop met een breed en ondiep dwarsprofiel. Ongeveer 8 maanden na aanleg zijn alternerende banken ontstaan. In eerste instantie...

journal article 2014

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Field experiment on alternate bar development in a straight sand-bed stream

Eekhout, J.P.C. (author), Hoitink, A.J.F. (author), Mosselman, E. (author)

Alternate bars in rivers and streams develop as a result of differences in length scales involved in the adjustment of flow and sediment transport to irregularities of the bed. The amount of field evidence supporting theoretical insights is highly limited. Here, we present results from a large-scale field experiment in a 600 m long straight...

journal article 2013

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Detailed simulation of morphodynamics: 3. Ripples and dunes

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

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Detailed simulation of morphodynamics: 2. Sediment pickup, transport, and deposition

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

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Detailed simulation of morphodynamics: 1. Hydrodynamic model

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

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Experimental and numerical evidence for intrinsic nonmigrating bars in alluvial channels

Crosato, A. (author), Mosselman, E. (author), Desta, F.B. (author), Uijttewaal, W.S.J. (author)

journal article 2011