Morphological Development of a Mega-Nourishment: First Observations at the Sand Engine

Large (mega-scale) nourishments have been proposed as a promising alternative for traditional beach and shoreface nourishments, especially for locations with large structural erosion and sufficient sediment to dredge. This paper examines the initial bathymetric evolution of the Sand Engine, a mega-nourishment of 17 million m3 protruding almost 1...

Transformation to a trunk and feeder network: effects on passenger flows, travel times and reliability

We evaluate a large scale network change in Amsterdam, the Netherlands, where a regional network of many direct bus lines is replaced by a new metro line as a trunk line and buses serving as feeder lines. For the analysis we use realized trip times from automated vehicle location data and ridership details from smart card data. In the new...

Latency-Constrained Fading Mitigation for Coherent Optical Feeder Links based on Space-Time-Frequency Coding

Optical feeder links (OFLs) benefit from the vast amount of bandwidth available in the THz-regime of the electromagnetic spectrum, and can be considered as enablers for future terabit-per-second satellite systems. A particular challenge for OFLs is to mitigate the effects of fading, caused by a combination of turbulence-induced scintillation,...

Walking and bicycle catchment areas of tram stops: Factors and insights

Pollution and congestion are important issues in urban mobility. These can potentially be solved by multimodal transport, such as the bicycle-Transit combination, which benefits from the flexible aspect of the bicycle and the wider spatial range of public transport. In addition, the bicycle can increase the catchment areas of public transport...

Observed Changes of a Mega Feeder Nourishment in a Coastal Cell: Five Years of Sand Engine Morphodynamics

Recently, mega feeder nourishments have been proposed as a new strategy to nourish sediment-starving beaches. This strategy involves the placement of a large, concentrated sediment volume at a single location along the coast. Wind, waves and currents act as the natural agents to spread the sediment alongshore over the course of years to decades....

Simulation of fixed versus on-demand station-based feeder operations

The paper develops a simulation model and evaluates fixed versus on-demand operational designs of a station-based automated feeder service. The evaluation considers the operational cost and average passenger level-of-service trade-offs as well as distributional differences in waiting times. Two case studies are used to evaluate such trade...

Exploring the use of automated vehicles as last mile connection of train trips through an agent-based simulation model: An application to Delft, Netherlands

The last mile in a public transport trip is known to bring a large disutility for passengers, because the conventional transport modes for this stage of the trip can, in many cases, be rather slow, inflexible and not provide a seamless experience to passengers. Fully automated vehicles (AVs), that is, those which do not need a driver, could act...

Distribution of passenger costs in fixed versus flexible station-based feeder services

This paper presents a comparative analysis of demand-responsive and fixed-schedule, fixed route operations for a simplified station-based feeder to mass transit scenario. Traffic dynamics, demand-responsive fleet coordination, and the behaviour of individual transit users are represented using a public transit simulation framework. Each...

A process-based modelling study on the morphological response of the Bacton Sandscaping project

The last couple of years, the interest in large nourishments, that also feed the adjacent coast, has increased. A feeder nourishment is suggested to be cost effective as well as ecological more beneficial than traditional nourishments. However, their behaviour is more complex and the need for better morphological predictions has increased....

An investigation of installation strategies to install next-generation offshore wind turbine generator components: Feedering vs. Shuttling, an efficient installation process for the future

Climate change is triggering among others a larger demand for offshore wind energy. This leads to new developments of which larger next-generation Wind Turbine Generators is the most relevant. These next-generation WTGs create problems for the carrying capacity of current-day installation jack-up vessels that work according to the conventional...

The choice of feeder container ships for the North Sea and Baltic Sea region

Container ships are becoming larger and larger, but also more numerous. As a result, these large ships are pushing their smaller counterparts down the line, until these smaller ships are no longer efficient for trade routes. The focus area of this thesis is on the North Sea and Baltic Sea area, in particular the area between the West coast of...

A lift-off investigation of next-generation offshore wind turbine generator components for feedering in the U.S.: Creating understanding in the release stage of a tower segment

Climate change is triggering an ever-growing demand for renewable energy. The U.S. is still far behind Europe when it comes to offshore wind energy. They have made ambitious plans to reach 30 GW in offshore wind energy by 2030 while currently 42 MW is installed. One of the main challenges in the U.S. is the installation method since a...

Development of a methodical framework for a seamless air cargo supply chain, from a transaction cost perspective, focusing on Direct Trucking Pick-ups: An exploratory case study for KLM Cargo

The air cargo market is experiencing momentous developments that may impact strongly on future trends. A consolidation shift has been observed, by more integration of the supply chain. Integrators engage in forwarding, forwarding agents operate their own aircraft and airlines bypass the forwarding agents, by striking direct structural deals with...

Evaluation of the feeder nourishment concept for the Atlantic southeast coast of the United States: A case study for Hilton Head Island, South Carolina

About 80-90% of U.S. East Coast barrier beaches have experienced erosion in the last 100 years. South Carolina’s coastline forms no exception, a third of its developed shoreline experiences erosion. Among these eroding shorelines is Hilton Head Island, the second largest barrier island on the U.S. East Coast. Until now, erosion here has been...

Cost-effectivity of logistical strategies for the installation of offshore wind turbine substructures

The ever-increasing size of offshore wind turbine substructures and the development of wind farms at sites further offshore, with greater water depths and with extremer weather conditions, raise logistical challenges that have never been faced before. Additionally, the offshore wind industry has to deal with governments cutting subsidies, small...

Feedering Method Analysis for 20 MW Offshore Wind Turbine Installation in the U.S.

The Jones Act, limited US port facilities, and absence of Jones Act-compliant installation vessels pose significant challenges for offshore wind farm installations. These factors force contractors to explore new installation strategies, such as feedering. Feedering is an installation strategy where the wind turbine installation vessel remains...

Model tests for a 25m wide beam container feeder

3.17 Verdere ontwikkeling benthos module (BENBOX): T.b.v. integraal model effectketen Noordzee Fase 2

Het doel van dit deelproject om de effecten van de aanleg van Flyland (veranderingen gesuspendeerd inert particulair materiaal in de waterkolom, fytoplanktonconcentraties en sedimentatie) op lager trofisch niveau (macrobenthos) beter door te vertalen naar hogere trofische niveaus zoals b.v. garnalen en vissen. Het gaat om een kwantitatieve...