TU Delft Open Access Journals
Not a member yet
3113 research outputs found
Sort by
[Poster] Exploiting high-resolution ADS-B data for flight operation reconstruction towards environmental impact assessment
No full textThe estimation of the detrimental impact of civil air traffic on the near-airport environment is conducted by means of dedicated assessment tools, usually based on best-practice methods. However, their application involves availability of information on the flight operations, and, although the use of flight tracking data is very helpful, their full inclusion into these tools is challenging. In this paper, following the authors’ previous efforts and with the purpose of future implementation into assessment tools, highly time-resolved datasets from the OpenSky Network are used for the identification of daily flight operations. Then, the ground track reconstruction is carried out with a newly developed algorithm, which exploits the high time resolution to generate smooth trajectories using only segments and circular arcs while maintaining high accuracy, as shown in the results. This work lays the foundation for immediate future developments involving the reconstruction of aircraft performance and the estimation of airport noise levels
A Cluster Analysis of Temporal Patterns of Travel Production in the Netherlands: Dominant within-day and day-to-day patterns and their association with Urbanization Levels
Get PDFThis paper explores temporal patterns in travel production using a full month of production data from traffic analysis zones (TAZ) in the (entire) Netherlands. The mentioned data is a processed aggregated derivative (due to privacy concerns) from GSM traces of a Dutch telecommunication company. This research thus also sheds light on whether such a processed data source is representative of both regular and non-regular patterns in travel production and how such data can be used for planning purposes. To this end, we construct normalized matrix (heatmap) representations of weekly hour-by-hour travel production patterns of over 1200 TAZs, which we cluster using K-means combined with deep convolutional neural networks (inception V3) to extract relevant features. A silhouette score shows that three dominant clusters of temporal patterns can be discerned (K=3). These three clusters have distinctly different within-day and day-to-day production patterns in terms of peak period intensity over different days of the week. Subsequently, a spatial analysis of these clusters reveals that the differences can be related to (easily observable) land-use features such as urbanization levels (i.e., Urban, Rural, and mixed-level). To substantiate this hypothesis and the usefulness of this clustering result, we apply an OVR-SMOTE-XGBoost ensemble classification model on the land-use features of the TAZs (i.e., to identify their cluster). The results of our clustering analysis show that given the land-use features, the overall production patterns are identifiable. Further analysis of the mixed-level areas shows a more complex relationship between temporal heterogeneity and spatial characteristics. Population density seems to impose additional uncertainty on the temporal patterns. All in all, feature selection and spatial and temporal discretization play essential roles in identifying the dominant trip production patterns. These findings are directly useful for data-driven estimation and prediction of demand time series. Furthermore, this study provides further insights into people\u27s mobility, relevant for transportation analysis and policies
Introduction
Get PDFThe special issue Writing Urban Places: New Narratives for the European City, marks the culmination of an international research network that delved into the intricate interplay between communities, urban spaces and narratives. At its core, this endeavour introduced an inventive approach aimed at deepening our comprehension of urban communities, their dynamics and their rootedness, all through the lens of narrative methodologies. This collection gives an account of the dynamics of this network of academics, which consists of over 175 individuals from 35 different European countries and a variety of disciplinary backgrounds. As such, the issue offers a conclusion to the Writing Urban Places COST Action while also providing a springboard for further reflections and discussions on urban narratives, and the role these could play in spatial developments in the European city
Delft: Views on Delft
No full textAround 1661, Johannes Vermeer painted what has become one of the most famous city views: the View of Delft. Delft, an intermediate European city in the Netherlands, located between The Hague and Rotterdam, has featured quite prominently in Dutch city narratives, partially thanks to Vermeer’s paintings, which showed fragments of both spatial and social characteristics of the city in the seventeenth century. As Delft is the city where this Writing Urban Place network originated, and where many members of the network have lived, studied or lectured, or are still doing all the above, this contribution collects their views on Delft, painting for our readers, in words, their accounts of the sociospatial characteristics of this city, their relationship with the water, their favourite urban places, their personal views of Delft. 
Post Rationality of a Hydraulic Civilization: An Ecological Transition for the Vietnamese Mekong Delta
Get PDFA radical project is proposed for the Vietnamese Mekong Delta, calling for the urgency to realize its Ecological Transition, as a response to the need to reverse the detrimental environmental impacts accumulated over the course of its history of agrarian colonization. The article reveals the evolution of the delta’s territory, through an atlas of palimpsests regarding the delta’s past transformations primarily driven by the hydraulic management of its territory. The resulting environmental degradation and obliteration of much of the Mekong Delta’s ability to self-regenerate are found in large part as the consequence of the devotion of the delta’s ecosystem resources to mass rice production; driven by vast irrigation infrastructural expansion. However, as an unintentional consequence of the investments made in infrastructural networks during the Green Revolution, a new value was propelled by farmers and the local community through the diversification of infrastructural uses, resulting in hybrid rururban land transformations, indicating the potential for Ecological Transition in the delta.
Through the theoretical perspective of alternative ways for metropolization defined in the ‘Horizontal Metropolis’ and the conceptual approach developed under the ‘Project of Isotropy’, post-rationality of the agrarian territory is proposed through the reorganization and design of the primary canals established for irrigation after the 1986 ‘Doi Moi’ reform period. Social-Techno-Ecological corridors are proposed to transform the currently overlooked and engineered canal settlements living in Long Xuyen Quadrangle and Can Tho province, through a resilient community-based living and cultivation paradigm based on the advancement of the traditional Vietnamese VAC (Garden-Pond-Animal) model. In addition, the Water Ecological Framework is proposed as a wider Delta Intervention whereby a series of circular water processes can take place ecologically across the territory, to promote the partial reinstatement of the Mekong’s deltaic regenerative processes.
As a radical integration between the wider Water Ecological Framework and the Social-Techno-Ecological corridors, the evolution of the deltaic territory is envisioned to create new social ecologies across the Mekong Delta, offering valuable climate-resilient ecosystems through biodiversity and a synergetic coexistence. Bringing into reality an Ecological Transition for the delta’s resilient future, whereby the regeneration of its deltaic processes shall be reinstated with a more conducive coexistence between humans and nature, as a new paradigm to address the wicked problems of our time
Radical Observation: A series of awareness exercises for developing inter-relationalities with natural world ecosystems
Get PDFSpecial Issue on Hyperconnectivity in the Physical Internet
Get PDFThis special issue of the Journal of Supply Chain Management Science (JSCMS) presents four papers that were discussed at the 9th International Physical Internet Conference (IPIC) in 2023
Prospects
Get PDFThe latest IPCC report which is named ‘The Synthesis Report , Climate Change 2023’ was released on 20 March 2023 to inform the 2023 Global Stocktake under the United Nations Framework Convention on Climate Change. The report finds that ‘there is more than 50% chance that global temperature rise will reach or surpass 1.5 degrees Celsius between 2021 and 2040 across studied scenarios, and under a high-emissions pathway, specifically, the world may hit this threshold even sooner, between 2018 and 2037.’ These findings again emphasise the growing pressures and challenges that deltas are confronting in their path towards future development. It is evident that the global imperative for deltas to adapt has reached an unprecedented level, but at the same time the question arises if adaptation is enough. Especially considering the scope of societal challenges that need to be the point of departure for sustainable spatial transformation in general. Aren\u27t they of such a fundamental nature that we need to reconsider our urban system as a whole and aim for transformation instead of adaptation? Looking more closely to the societal challenges we can organise them according to their environmental and socio-economic drivers. The environmental drivers are the climate crisis and the biodiversity crisis. The socio-economic drivers are ongoing urbanisation, the energy transition, and the new economy
Popular culture and Nile hydropolitics: Amharic songs about the Grand Ethiopian Renaissance Dam
Get PDFWater conflicts and negotiations between riparian states in the Nile Basin have mostly focused on legal, political, technical, and hydrological aspects of the river and dam construction. The contemporary cultural, emotional, and symbolic dimensions of the river and its dams have been largely overlooked. Therefore, this article explores how the Nile is portrayed, embedded, and perceived in Ethiopian popular culture, particularly popular songs. The Abbay, as the Nile is called in Ethiopia, is an integral part of the country’s identity, culture, history and politics. The river is at the heart of Ethiopian public space and popular songs, which both influence and are shaped by public opinion and official government discourses. The narratives communi- cated through these popular songs dramatically changed after construction began for the Grand Ethiopian Renaissance Dam (GERD) on the Blue Nile in 2011. While most songs had previously lamented and cursed the river’s indifference to Ethiopians’ strife, newer narratives glorify and celebrate the river and the GERD. This study used discourse analysis to illustrate how popular songs shape public opinion about Abbay and mobilize popular support for the construction of the GERD. The article concludes with broader implications for water diplomacy and ongoing GERD negotiations
Experience From the 2021 Floods in the Netherlands: Household Survey Results on Impacts and Responses
Get PDFThis study gives unique insights into residents\u27 experiences of the 2021 floods in the Netherlands. Survey data was collected from 1,513 respondents who lived in flooded areas or faced a flood threat. We present an overview of survey results about the flood hazard and impacts experienced, evacuation responses, flood damage mitigation measures undertaken, compensation progress, risk perceptions, and stress. The results confirm the flood\u27s substantial impacts: flood inundation levels varied from several centimeters to more than two meters. Inundation depths and median damages were considerably higher along the Geul River than the Meuse River. For all flooded households, median damages reported are €25,000 for homes, €17,000 for home contents, €8,000 for floors, and €2,500 for cleaning costs. Various flood damage mitigation measures were taken; placing sandbags, moving property to higher locations, and installing water pumps were quoted most frequently (30%-35%). High risk perception influences behavior, as respondents who were aware of flood risks beforehand were 23% up to twice as likely to take flood risk reduction measures as those who were not aware. Moving property to higher areas provided the greatest decrease in damage by almost halving economic losses. Placing sandbags or flood shields was generally ineffective (in approximately two-third of all cases), likely due to overtopping by high flood water levels. Our survey results show that of those who received warnings, approximately 75% actually evacuated. However, our survey results indicate the existence of people who were flooded but did not receive a warning. Among the respondents who were not told to evacuate, the fraction of people who evacuated was considerably lower: ~20%. Additionally, the majority (75%) of respondents experienced high or very high stress during and after the flood, which is most likely related to the destructive flood impacts and to the slow and uncertain compensation experienced by many respondents