document

The importance of time-varying, non-tidal currents in modelling in-situ sand wave dynamics

Overes, P.H.P. (author), Borsje, B. W. (author), Luijendijk, Arjen (author), Hulscher, S. J.M.H. (author)

Sand waves are found on shallow, sandy seabeds throughout the world and their dynamics may pose an imminent threat to offshore construction. Therefore, there is a pressing need to understand bed level dynamics in sand wave areas. These bed level dynamics lead to variations in sand wave shape and migration rate over time. However, these...

journal article 2024

document

An analytical flow-by capacitive deionization model

Haverkort, J.W. (author), Sanderse, B. (author), Padding, J.T. (author), Blake, J.W. (author)

In flow-by capacitive deionization (CDI) brackish water flows between two electrodes that capacitively remove salt. We assume low inlet concentrations so “salt shocks” appear in the electrodes and the process becomes diffusion-limited. For unit charge efficiency, a simplified model is derived consisting of two coupled partial differential...

journal article 2024

document

Reactive Transport Modeling for Exploring the Potential of Water Quality Sensors to Estimate Hydrocarbon Levels in Groundwater

Wu, C.L. (author), Wagterveld, R. M. (author), van Breukelen, B.M. (author)

Petroleum products have contaminated groundwater with harmful organic compounds, such as benzene, toluene, ethylbenzene, and xylenes (BTEX). Collecting and analyzing polluted groundwater samples is expensive and undertaken infrequently. However, quick remedial action in case of unexpected events requires continuous monitoring. In-situ water...

journal article 2024

document

Design and Implementation of a Low-Cost Air Quality Network for the Aburra Valley Surrounding Mountains: Pollutants

Yarce Botero, A. (author), Lopez Restrepo, S. (author), Sebastian Rodriguez, Juan (author), Valle, Diego (author), Galvez-Serna, Julian (author), Montilla, Elena (author), Botero, Francisco (author), Henzing, Bas (author), Heemink, A.W. (author)

The densest network for measuring air pollutant concentrations in Colombia is in Medellin, where most sensors are located in the heavily polluted lower parts of the valley. Measuring stations in the higher elevations on the mountains surrounding the valley are not available, which limits our understanding of the valley’s pollutant dynamics and...

journal article 2023

document

Optimization of the location and capacity of shared multimodal mobility hubs to maximize travel utility in urban areas

Xanthopoulos, S. (author), van der Tuin, M.S. (author), Sharif Azadeh, S. (author), Correia, Gonçalo (author), van Oort, N. (author), Snelder, M. (author)

Nowadays, urban areas are exposed to various challenges such as climate change, social inequalities, and congestion. Shared mobility hubs present the opportunity to reshape our cities and mitigate the previously mentioned challenges by contributing to a more sustainable transport system. These are places where shared cars, mopeds, and e-bikes...

journal article 2023

document

Data-driven preference-based routing and scheduling for activity-based freight transport modelling

Nadi Najafabadi, A. (author), Yorke-Smith, N. (author), Snelder, M. (author), van Lint, J.W.C. (author), Tavasszy, Lorant (author)

Understanding preferences and behaviours in road freight transport is valuable for planning and analysis. This paper proposes a data-driven vehicle routing and scheduling approach for use as a descriptive tool to study road freight transport activities. The model developed seeks to capture planners’ or drivers’ preferences in order to...

journal article 2023

document

Advecting Superspecies: Efficiently Modeling Transport of Organic Aerosol With a Mass-Conserving Dimensionality Reduction Method

Sturm, Patrick Obin (author), Manders, Astrid (author), Janssen, Ruud (author), Segers, Arjo (author), Wexler, Anthony S. (author), Lin, H.X. (author)

The chemical transport model LOTOS-EUROS uses a volatility basis set (VBS) approach to represent the formation of secondary organic aerosol (SOA) in the atmosphere. Inclusion of the VBS approximately doubles the dimensionality of LOTOS-EUROS and slows computation of the advection operator by a factor of two. This complexity limits SOA...

journal article 2023

document

Requirements for corrosion inhibitor release from damaged primers for stable protection: A simulation and experimental approach using cerium loaded carriers

Denissen, P.J. (author), Homborg, A.M. (author), Garcia, Santiago J. (author)

In this work a diffusion-driven inhibitor transport model is used to help in the design of inhibitor-loaded carriers for anticorrosive primers. The work focuses on inhibitor release at damaged locations of different dimensions exposed to electrolyte and is validated experimentally. The damage dimensions are first simulated to determine the...

journal article 2022

document

Secure Multi-party Co-planning of Barge Departures

Larsen, R.B. (author), Baksteen, Ruud (author), Atasoy, B. (author), Negenborn, R.R. (author)

Container transport requires real-time control and a high degree of cooperation to alleviate disturbances and perform smoothly without unnecessary environmental impact and monetary losses. The involved operators are, however, often reluctant to cooperate as they fear loosing valuable information and autonomy, eventually leading their clients...

journal article 2021

document

Reactive Transport Modelling of Chloride Ingress in Saturated Coral Aggregate Concrete

Guo, Bingbing (author), Li, Z. (author), Fu, Qiang (author), Wang, Yan (author), Huang, Daguan (author), Niu, Ditao (author)

Utilizing coral aggregate concrete (CAC) for construction on remote islands can significantly reduce construction cost and period, CO₂ emission, and consumption of non-renewable energy. The durability of reinforced CAC structures is critically influenced by their resistance to chloride attack. In this study, a reactive transport...

journal article 2021

document

An efficient ensemble Kalman Filter implementation via shrinkage covariance matrix estimation: exploiting prior knowledge

Lopez Restrepo, S. (author), Nino-Ruiz, Elias D. (author), Guzman-Reyes, Luis G. (author), Yarce, Andres (author), Quintero, O. L. (author), Pinel, Nicolas (author), Segers, Arjo (author), Heemink, A.W. (author)

In this paper, we propose an efficient and practical implementation of the ensemble Kalman filter via shrinkage covariance matrix estimation. Our filter implementation combines information brought by an ensemble of model realizations, and that based on our prior knowledge about the dynamical system of interest. We perform the combination of...

journal article 2021

document

On the cost elasticity of inter-regional distribution structures: A case study for the Netherlands

Davydenko, Igor Y. (author), Tavasszy, Lorant (author), Quak, Hans (author)

Several studies show that logistics facilities have spread spatially from relatively concentrated clusters in the 1970s to geographically more decentralized patterns away from urban areas. The literature indicates that logistics costs are one of the major influences on changes in distribution structures, or locations and usage of logistics...

journal article 2021

document

Urban air quality modeling using low-cost sensor network and data assimilation in the aburrá valley, colombia

Lopez Restrepo, S. (author), Yarce Botero, A. (author), Pinel Pelaez, N. (author), Quintero Montoya, O.L. (author), Segers, Arjo (author), Heemink, A.W. (author)

The use of low air quality networks has been increasing in recent years to study urban pollution dynamics. Here we show the evaluation of the operational Aburrá Valley’s low-cost network against the official monitoring network. The results show that the PM_2.5 low-cost measurements are very close to those observed by the official...

journal article 2021

document

Reactive transport modelling of push-pull tests: A versatile approach to quantify aquifer reactivity

Kruisdijk, E. (author), van Breukelen, B.M. (author)

Push-pull tests (PPTs) were evaluated with 1-D radially axisymmetric multi-component geochemical reactive transport modelling (RTM) to assess aquifer reactivity controlling groundwater quality. Nutrient fate and redox processes were investigated in an Aquifer Storage and Recovery (ASR) system, in which oxic tile drainage water (TDW; nitrate ...

journal article 2021

document

The disruption transport model: computing user delays resulting from infrastructure failures for multi-modal passenger & freight traffic

van der Tuin, M.S. (author), Pel, A.J. (author)

Transport infrastructure owners are moving from reactive toward proactive infrastructure management. This involves computation of costs associated with failure or maintenance, including expected transport delays. These delays are often computed by multiplying additional travel time by the number of travellers. However, this does not reflect...

journal article 2020

document

It was twenty years ago today: Revisiting time-of-day choice in the Netherlands

de Jong, Gerard (author), Kouwenhoven, M.L.A. (author), Daly, Andrew (author), Thoen, S. (author), de Gier, Matthijs (author), Hofman, Frank (author)

Time-of-day (TOD) choice can be considered as a fifth stage in the modelling of transport behaviour, additional to the conventional four stages. Twenty years ago in The Netherlands, a stated preference (SP) study was designed for investigating the choice of time-of-day (departure time) and transport mode. A nested logit time period and mode...

journal article 2020

document

Descriptive modeling of freight tour formation: A shipment-based approach

Thoen, Sebastiaan (author), Tavasszy, Lorant (author), de Bok, M.A. (author), van Duin, Ron (author)

An increasing amount of research is dedicated to the consideration of tour formation in freight transportation demand models. While empirical tour formation models so far have been starting from limiting assumptions about the resulting trips, we develop a generalized shipment-based model. We formulate a random utility model embedded in an...

journal article 2020

document

Predicting the effects of logistics innovations on freight systems: Directions for research

Tavasszy, Lorant (author)

Logistics processes underlying freight transport are changing rapidly, driven by progress in information technology and an unparalleled growth of consumer involvement in supply chains. This development is also driving change in freight transport flows, by all modes of transport. We argue that an understanding of logistics innovations is a...

journal article 2020

document

Microbially mediated kinetic sulfur isotope fractionation: reactive transport modeling benchmark

Cheng, Yiwei (author), Arora, Bhavna (author), Şengör, S. Sevinç (author), Druhan, Jennifer L. (author), Wanner, Christoph (author), van Breukelen, B.M. (author), Steefel, Carl I. (author)

Microbially mediated sulfate reduction is a ubiquitous process in many subsurface systems. Isotopic fractionation is characteristic of this anaerobic process, since sulfate-reducing bacteria (SRB) favor the reduction of the lighter sulfate isotopologue (S³²O₄²⁻) over the heavier isotopologue (S³⁴O...

journal article 2020

document

Applying aluminum-organic matter precipitates to reduce soil permeability in-situ: A field and modeling study

Zhou, Jianchao (author), Laumann, S.J. (author), Heimovaara, T.J. (author)

Using naturally occurring processes to modify the engineering properties of the subsurface has received increasing attention from industry and research communities as they aid in the development of cost-effective, robust and sustainable engineering technologies. In line with this trend, we propose to use precipitates of aluminum (Al) and organic...

journal article 2019