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TL;DR: In this article, a series of radiocarbon-dated sediment cores from the Mississippi Delta were used to analyse late Holocene deposits and assess compaction rates, and they found that millennial-scale compaction rate primarily associated with peat can reach 5mm per year, values that exceed recent model predictions.
Abstract: Coastal subsidence causes sea-level rise, shoreline erosion and wetland loss, which poses a threat to coastal populations. This is especially evident in the Mississippi Delta in the southern United States, which was devastated by Hurricane Katrina in 2005. The loss of protective wetlands is considered a critical factor in the extensive flood damage. The causes of subsidence in coastal Louisiana, attributed to factors as diverse as shallow compaction and deep crustal processes, remain controversial. Current estimates of subsidence rates vary by several orders of magnitude. Here, we use a series of radiocarbon-dated sediment cores from the Mississippi Delta to analyse late Holocene deposits and assess compaction rates. We find that millennial-scale compaction rates primarily associated with peat can reach 5mm per year, values that exceed recent model predictions. Locally and on timescales of decades to centuries, rates are likely to be 10 mm or more per year. We conclude that compaction of Holocene strata contributes significantly to the exceptionally high rates of relative sea-level rise and coastal wetland loss in the Mississippi Delta, and is likely to cause subsidence in other organic-rich and often densely populated coastal plains.
414 citations
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TL;DR: In this paper, a correlation analysis is performed based on measured data and field observations, and then a relation between squat occurrence and some parameters of the vehicle-track system is identified.
179 citations
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TL;DR: In this paper, a stochastic optimization model is used to allocate the time supplements and buffer times in a given timetable in such a way that the timetable becomes maximally robust against the disturbances of real-time railway operations.
Abstract: Real-time railway operations are subject to stochastic disturbances. Thus a timetable should be designed in such a way that it can cope with these disturbances as well as possible. For that purpose, a timetable usually contains time supplements in several process times and buffer times between pairs of consecutive trains. This paper describes a Stochastic Optimization Model that can be used to allocate the time supplements and the buffer times in a given timetable in such a way that the timetable becomes maximally robust against stochastic disturbances. The Stochastic Optimization Model was tested on several instances of NS Reizigers, the main operator of passenger trains in the Netherlands. Moreover, a timetable that was computed by the model was operated in practice in a timetable experiment on the so-called “Zaanlijn”. The results show that the average delays of trains can often be reduced significantly by applying relatively small modifications to a given timetable.
175 citations
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TL;DR: In this article, the track technical state can be assessed with the aid of axle box acceleration measurements, which can indicate short track defects like squats, welds with poor finishing quality, insulated joints, corrugation, etc.
153 citations
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TL;DR: This paper attempts to decrease these interdependencies by reducing the running time differences per track section, i.e. by creating more homogeneous timetables, as opposed to the present day heterogeneous ones.
148 citations
Authors
Showing all 65 results
Name | H-index | Papers | Citations |
---|---|---|---|
Rolf Dollevoet | 27 | 106 | 2171 |
I.Y. Shevtsov | 12 | 25 | 492 |
Michiel Vromans | 11 | 18 | 1013 |
Julia C. Lo | 10 | 25 | 443 |
Emdzad Sehic | 5 | 8 | 68 |
Tijs Huisman | 5 | 7 | 358 |
W. Loonen | 4 | 9 | 98 |
Jelle van Luipen | 4 | 7 | 66 |
Alfons A. M. Schaafsma | 3 | 3 | 27 |
Robin Hemelrijk | 3 | 4 | 9 |
Arjen Zoeteman | 3 | 12 | 84 |
Henrico Plantinga | 2 | 6 | 16 |
Natasha Weitenberg | 2 | 3 | 40 |
J. van Luipen | 2 | 2 | 43 |
Marcel van Ofwegen | 2 | 2 | 12 |