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A.J.M.J. van Niekerk
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Tsunamis, flood waves and dam-break waves are highly destructive waves where a better description of these waves will contribute to a safer design of hydraulic structures. These waves are characterized by a sudden increase in water elevation with a breaking roller, which is a recirculating flow mixture of air and water, at the front of the wave. This study aims to get a better understanding of the fluctuating behaviour of dam-break waves over a wet bed across scales, focusing on the roller toe, which marks the transition from the downstream water level to the incoming bore.
Dam-break wave experiments, generated by the use of a lift gate system, were conducted on two scales for Froude numbers in a range of 2.44- 7.05, resulting in a range of varying Reynolds numbers between 0.22e5- 3.49e5. A High-Speed video camera recorded the waves from the top which enabled the wave profiles of the roller toe to be distinctly extracted. Due to the high level of unsteadiness in the flow, ensemble statistics are used, leveraging statistical properties to compare wave characteristics across different flow conditions.
The bore front celerity, roller toe fluctuations, instantaneous celerity (fluctuations) and indentation coefficient give in-depth insight in the hydrodynamic behaviour of the roller toe. Comparison with the dam-break wave theory showed good agreement with the bore’s celerity based on the experimental results. The fluctuating behavior of the roller toe increased for an increasing Froude number, indicating that gravity is the dominant force driving these variations. The magnitude of fluctuations in relation to the Reynolds number showed a slightly decreasing trend, indicating the presence of scale effects and emphasizing the importance of investigating these highly turbulent flow motions. The indentation coefficient underscored the presence of turbulence as highlighting different results between wave types. Overall, this study contributes to a better understanding of highly unsteady flows. ...
Dam-break wave experiments, generated by the use of a lift gate system, were conducted on two scales for Froude numbers in a range of 2.44- 7.05, resulting in a range of varying Reynolds numbers between 0.22e5- 3.49e5. A High-Speed video camera recorded the waves from the top which enabled the wave profiles of the roller toe to be distinctly extracted. Due to the high level of unsteadiness in the flow, ensemble statistics are used, leveraging statistical properties to compare wave characteristics across different flow conditions.
The bore front celerity, roller toe fluctuations, instantaneous celerity (fluctuations) and indentation coefficient give in-depth insight in the hydrodynamic behaviour of the roller toe. Comparison with the dam-break wave theory showed good agreement with the bore’s celerity based on the experimental results. The fluctuating behavior of the roller toe increased for an increasing Froude number, indicating that gravity is the dominant force driving these variations. The magnitude of fluctuations in relation to the Reynolds number showed a slightly decreasing trend, indicating the presence of scale effects and emphasizing the importance of investigating these highly turbulent flow motions. The indentation coefficient underscored the presence of turbulence as highlighting different results between wave types. Overall, this study contributes to a better understanding of highly unsteady flows. ...
Tsunamis, flood waves and dam-break waves are highly destructive waves where a better description of these waves will contribute to a safer design of hydraulic structures. These waves are characterized by a sudden increase in water elevation with a breaking roller, which is a recirculating flow mixture of air and water, at the front of the wave. This study aims to get a better understanding of the fluctuating behaviour of dam-break waves over a wet bed across scales, focusing on the roller toe, which marks the transition from the downstream water level to the incoming bore.
Dam-break wave experiments, generated by the use of a lift gate system, were conducted on two scales for Froude numbers in a range of 2.44- 7.05, resulting in a range of varying Reynolds numbers between 0.22e5- 3.49e5. A High-Speed video camera recorded the waves from the top which enabled the wave profiles of the roller toe to be distinctly extracted. Due to the high level of unsteadiness in the flow, ensemble statistics are used, leveraging statistical properties to compare wave characteristics across different flow conditions.
The bore front celerity, roller toe fluctuations, instantaneous celerity (fluctuations) and indentation coefficient give in-depth insight in the hydrodynamic behaviour of the roller toe. Comparison with the dam-break wave theory showed good agreement with the bore’s celerity based on the experimental results. The fluctuating behavior of the roller toe increased for an increasing Froude number, indicating that gravity is the dominant force driving these variations. The magnitude of fluctuations in relation to the Reynolds number showed a slightly decreasing trend, indicating the presence of scale effects and emphasizing the importance of investigating these highly turbulent flow motions. The indentation coefficient underscored the presence of turbulence as highlighting different results between wave types. Overall, this study contributes to a better understanding of highly unsteady flows.
Dam-break wave experiments, generated by the use of a lift gate system, were conducted on two scales for Froude numbers in a range of 2.44- 7.05, resulting in a range of varying Reynolds numbers between 0.22e5- 3.49e5. A High-Speed video camera recorded the waves from the top which enabled the wave profiles of the roller toe to be distinctly extracted. Due to the high level of unsteadiness in the flow, ensemble statistics are used, leveraging statistical properties to compare wave characteristics across different flow conditions.
The bore front celerity, roller toe fluctuations, instantaneous celerity (fluctuations) and indentation coefficient give in-depth insight in the hydrodynamic behaviour of the roller toe. Comparison with the dam-break wave theory showed good agreement with the bore’s celerity based on the experimental results. The fluctuating behavior of the roller toe increased for an increasing Froude number, indicating that gravity is the dominant force driving these variations. The magnitude of fluctuations in relation to the Reynolds number showed a slightly decreasing trend, indicating the presence of scale effects and emphasizing the importance of investigating these highly turbulent flow motions. The indentation coefficient underscored the presence of turbulence as highlighting different results between wave types. Overall, this study contributes to a better understanding of highly unsteady flows.
A multidisciplinairy approach to watermanagement in ricanau mofo
A scientific study that explores solutions for Ricanau Mofo's water management challenges, focusing on riverbank stabilization, improved drainage and responsible waste management
Student report
(2024)
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M.J. Duinmeijer, C.M.F. van der Feltz, A.J.M.J. van Niekerk, M.E. Overdijk, T.C. Schell, D.C. Spaargaren, M.W. Ertsen, G.A. van Nederveen, J. Coelen
Located in Suriname, the village of Ricanau Mofo faces a multitude of environmental challenges. This report delves into a comprehensive study that employed a multidisciplinary approach, leveraging the expertise of students from various backgrounds to address these pressing issues.
The most critical concern identified was the relentless erosion of the riverbank, forming an existential threat to the village. The report explores interventions for both riverbank and soil erosion. Building upon the previous year's sheet pile wall construction by van Dongen et al. (2023), the report evaluates its effectiveness and proposes potential improvements for natural shore protection. It presents an analysis of structural solutions like sheet pile walls and quay walls, alongside nature-based methods that promote vegetation growth. A multi-criteria analysis is employed to objectively evaluate the effectiveness and feasibility of each intervention.
Moving beyond the riverbank, the report investigates soil erosion in Ricanau Mofo's old center. To understand the water flow patterns, a hydrological analysis was conducted. This analysis incorporated field measurements, on-site observations, and existing scientific reports. By considering factors like clay content, vegetation cover, discharge, and slope, the study categorized different flow areas within the village center. This detailed analysis lead to the proposal of a combination of targeted interventions, including roof gutters, strategic vegetation planting, and channel improvements, all aimed at effectively addressing drainage issues and mitigating soil erosion.
Waste management emerged as another critical concern. The report sheds light on the impact of inadequate waste collection systems on hygiene and even the success of other implemented solutions. Recognizing the importance of community involvement, the report proposes a roadmap and implements a physical prototype for establishing a more organized and effective waste management system, promoting a sense of shared responsibility for a cleaner Ricanau Mofo.
This report illustrates the value of a multidisciplinary approach. By combining diverse expertise and conducting thorough analyses, the study provides a comprehensive understanding of Ricanau Mofo's environmental challenges. The proposed solutions for riverbank and soil erosion control, improved drainage, and effective waste management offer a sustainable path forward for the village's future development. ...
The most critical concern identified was the relentless erosion of the riverbank, forming an existential threat to the village. The report explores interventions for both riverbank and soil erosion. Building upon the previous year's sheet pile wall construction by van Dongen et al. (2023), the report evaluates its effectiveness and proposes potential improvements for natural shore protection. It presents an analysis of structural solutions like sheet pile walls and quay walls, alongside nature-based methods that promote vegetation growth. A multi-criteria analysis is employed to objectively evaluate the effectiveness and feasibility of each intervention.
Moving beyond the riverbank, the report investigates soil erosion in Ricanau Mofo's old center. To understand the water flow patterns, a hydrological analysis was conducted. This analysis incorporated field measurements, on-site observations, and existing scientific reports. By considering factors like clay content, vegetation cover, discharge, and slope, the study categorized different flow areas within the village center. This detailed analysis lead to the proposal of a combination of targeted interventions, including roof gutters, strategic vegetation planting, and channel improvements, all aimed at effectively addressing drainage issues and mitigating soil erosion.
Waste management emerged as another critical concern. The report sheds light on the impact of inadequate waste collection systems on hygiene and even the success of other implemented solutions. Recognizing the importance of community involvement, the report proposes a roadmap and implements a physical prototype for establishing a more organized and effective waste management system, promoting a sense of shared responsibility for a cleaner Ricanau Mofo.
This report illustrates the value of a multidisciplinary approach. By combining diverse expertise and conducting thorough analyses, the study provides a comprehensive understanding of Ricanau Mofo's environmental challenges. The proposed solutions for riverbank and soil erosion control, improved drainage, and effective waste management offer a sustainable path forward for the village's future development. ...
Located in Suriname, the village of Ricanau Mofo faces a multitude of environmental challenges. This report delves into a comprehensive study that employed a multidisciplinary approach, leveraging the expertise of students from various backgrounds to address these pressing issues.
The most critical concern identified was the relentless erosion of the riverbank, forming an existential threat to the village. The report explores interventions for both riverbank and soil erosion. Building upon the previous year's sheet pile wall construction by van Dongen et al. (2023), the report evaluates its effectiveness and proposes potential improvements for natural shore protection. It presents an analysis of structural solutions like sheet pile walls and quay walls, alongside nature-based methods that promote vegetation growth. A multi-criteria analysis is employed to objectively evaluate the effectiveness and feasibility of each intervention.
Moving beyond the riverbank, the report investigates soil erosion in Ricanau Mofo's old center. To understand the water flow patterns, a hydrological analysis was conducted. This analysis incorporated field measurements, on-site observations, and existing scientific reports. By considering factors like clay content, vegetation cover, discharge, and slope, the study categorized different flow areas within the village center. This detailed analysis lead to the proposal of a combination of targeted interventions, including roof gutters, strategic vegetation planting, and channel improvements, all aimed at effectively addressing drainage issues and mitigating soil erosion.
Waste management emerged as another critical concern. The report sheds light on the impact of inadequate waste collection systems on hygiene and even the success of other implemented solutions. Recognizing the importance of community involvement, the report proposes a roadmap and implements a physical prototype for establishing a more organized and effective waste management system, promoting a sense of shared responsibility for a cleaner Ricanau Mofo.
This report illustrates the value of a multidisciplinary approach. By combining diverse expertise and conducting thorough analyses, the study provides a comprehensive understanding of Ricanau Mofo's environmental challenges. The proposed solutions for riverbank and soil erosion control, improved drainage, and effective waste management offer a sustainable path forward for the village's future development.
The most critical concern identified was the relentless erosion of the riverbank, forming an existential threat to the village. The report explores interventions for both riverbank and soil erosion. Building upon the previous year's sheet pile wall construction by van Dongen et al. (2023), the report evaluates its effectiveness and proposes potential improvements for natural shore protection. It presents an analysis of structural solutions like sheet pile walls and quay walls, alongside nature-based methods that promote vegetation growth. A multi-criteria analysis is employed to objectively evaluate the effectiveness and feasibility of each intervention.
Moving beyond the riverbank, the report investigates soil erosion in Ricanau Mofo's old center. To understand the water flow patterns, a hydrological analysis was conducted. This analysis incorporated field measurements, on-site observations, and existing scientific reports. By considering factors like clay content, vegetation cover, discharge, and slope, the study categorized different flow areas within the village center. This detailed analysis lead to the proposal of a combination of targeted interventions, including roof gutters, strategic vegetation planting, and channel improvements, all aimed at effectively addressing drainage issues and mitigating soil erosion.
Waste management emerged as another critical concern. The report sheds light on the impact of inadequate waste collection systems on hygiene and even the success of other implemented solutions. Recognizing the importance of community involvement, the report proposes a roadmap and implements a physical prototype for establishing a more organized and effective waste management system, promoting a sense of shared responsibility for a cleaner Ricanau Mofo.
This report illustrates the value of a multidisciplinary approach. By combining diverse expertise and conducting thorough analyses, the study provides a comprehensive understanding of Ricanau Mofo's environmental challenges. The proposed solutions for riverbank and soil erosion control, improved drainage, and effective waste management offer a sustainable path forward for the village's future development.
In het gebied Apeldoorn – Dieren ligt een oude spoorlijn van de Veluwsche Stoomtrein Maatschappij die op dit moment alleen nog voor toeristisch gebruik wordt geëxploiteerd. Om de bereikbaarheid van het gebied te vergroten wordt er onderzoek gedaan naar de mogelijkheid om hier een railgebonden voertuig op de introduceren. Dit leidt tot de vraag; “Hoe kan in het gebied Apeldoorn – Dieren een railgebonden voertuig worden geïntroduceerd op de oude spoorlijn van de VSM?” Om deze vraag te beantwoorden is er gekeken naar verschillende aspecten. Het gaat hier om de aanwezige infrastructuur, soorten railgebonden voertuigen, relevante referentieprojecten, verschillende technische aspecten, duurzame energietoevoer en aanpassingen die nodig zijn aan de infrastructuur om dit te realiseren. De lijn bestaat uit de stations Apeldoorn, Beekbergen, Loenen, Eerbeek en Dieren. De stoomtrein heeft een eigen dienstregeling en rijdt in het hoogseizoen ongeveer twee keer per dag. De huidige infrastructuur geeft beperkingen voor de introductie van een railgebonden voertuig. Zo ligt er enkelspoor en is de maximale snelheid op de lijn 40 km/h. Voor het railgebonden voertuig is gekozen voor een light rail voertuig. Dit is een licht voertuig wat snel kan accelereren. Verder mag er om de historische waarde van de VSM lijn te behouden, geen bovenleiding worden aangelegd. Om deze reden is er onderzoek gedaan naar verschillende soorten energietoevoer. Vanwege duurzaamheidsredenen en de aanwezige infrastructuur is er gekozen voor een batterij. De energie zal komen van windmolens die in de provincie geplaatst worden. Met behulp van de referentieprojecten zijn er verschillende technische aspecten uitgelicht. Hieruit is voort gekomen dat het van belang is dat de wissels en wielen goed op elkaar afgestemd zijn. Wanneer de wielen te klein of te groot zijn voor de wissels, kan dit zorgen voor ontsporingen, zoals gebeurd is bij de RandstadRail. Verder zijn de perronhoogte, seinen en communicatie tijdens de uitvoering van het project van belang om conflicten te voorkomen. Kijkend naar en rekening houdend met deze aspecten zijn er verschillende aanpassingen nodig aan de lijn om een railgebonden voertuig daarop te introduceren. Dit betreft onder andere de laadinfrastructuur op de perrons van Dieren en Apeldoorn. Verder zijn er ook verscheidene aanpassingen langs de lijn zelf nodig. Denk hierbij aan het verlengen van perrons en het plaatsen van wissels en extra stukken rails. Met behulp van deze aanpassingen is het mogelijk om een voertuig te introduceren wat er 35 minuten over doet om van Apeldoorn naar Dieren rijdt en andersom. Deze zal één keer per ruim half uur rijden. Echter, reflecterend op het onderzoek zijn er verscheidene aannames gemaakt die het niet reëel maken om een railgebonden voertuig op deze lijn te introduceren. Er is al een buslijn aanwezig met dezelfde frequentie die er een kwartiertje langer over doet. Voor de aanpassingen die gemaakt moeten worden aan de infrastructuur weegt dit niet op tegen de gevonden resultaten. Verder is er geen onderzoek gedaan naar de bereikbaarheid en is het niet bekend of de aanname dat deze verhoog moet worden, juist is.
...
In het gebied Apeldoorn – Dieren ligt een oude spoorlijn van de Veluwsche Stoomtrein Maatschappij die op dit moment alleen nog voor toeristisch gebruik wordt geëxploiteerd. Om de bereikbaarheid van het gebied te vergroten wordt er onderzoek gedaan naar de mogelijkheid om hier een railgebonden voertuig op de introduceren. Dit leidt tot de vraag; “Hoe kan in het gebied Apeldoorn – Dieren een railgebonden voertuig worden geïntroduceerd op de oude spoorlijn van de VSM?” Om deze vraag te beantwoorden is er gekeken naar verschillende aspecten. Het gaat hier om de aanwezige infrastructuur, soorten railgebonden voertuigen, relevante referentieprojecten, verschillende technische aspecten, duurzame energietoevoer en aanpassingen die nodig zijn aan de infrastructuur om dit te realiseren. De lijn bestaat uit de stations Apeldoorn, Beekbergen, Loenen, Eerbeek en Dieren. De stoomtrein heeft een eigen dienstregeling en rijdt in het hoogseizoen ongeveer twee keer per dag. De huidige infrastructuur geeft beperkingen voor de introductie van een railgebonden voertuig. Zo ligt er enkelspoor en is de maximale snelheid op de lijn 40 km/h. Voor het railgebonden voertuig is gekozen voor een light rail voertuig. Dit is een licht voertuig wat snel kan accelereren. Verder mag er om de historische waarde van de VSM lijn te behouden, geen bovenleiding worden aangelegd. Om deze reden is er onderzoek gedaan naar verschillende soorten energietoevoer. Vanwege duurzaamheidsredenen en de aanwezige infrastructuur is er gekozen voor een batterij. De energie zal komen van windmolens die in de provincie geplaatst worden. Met behulp van de referentieprojecten zijn er verschillende technische aspecten uitgelicht. Hieruit is voort gekomen dat het van belang is dat de wissels en wielen goed op elkaar afgestemd zijn. Wanneer de wielen te klein of te groot zijn voor de wissels, kan dit zorgen voor ontsporingen, zoals gebeurd is bij de RandstadRail. Verder zijn de perronhoogte, seinen en communicatie tijdens de uitvoering van het project van belang om conflicten te voorkomen. Kijkend naar en rekening houdend met deze aspecten zijn er verschillende aanpassingen nodig aan de lijn om een railgebonden voertuig daarop te introduceren. Dit betreft onder andere de laadinfrastructuur op de perrons van Dieren en Apeldoorn. Verder zijn er ook verscheidene aanpassingen langs de lijn zelf nodig. Denk hierbij aan het verlengen van perrons en het plaatsen van wissels en extra stukken rails. Met behulp van deze aanpassingen is het mogelijk om een voertuig te introduceren wat er 35 minuten over doet om van Apeldoorn naar Dieren rijdt en andersom. Deze zal één keer per ruim half uur rijden. Echter, reflecterend op het onderzoek zijn er verscheidene aannames gemaakt die het niet reëel maken om een railgebonden voertuig op deze lijn te introduceren. Er is al een buslijn aanwezig met dezelfde frequentie die er een kwartiertje langer over doet. Voor de aanpassingen die gemaakt moeten worden aan de infrastructuur weegt dit niet op tegen de gevonden resultaten. Verder is er geen onderzoek gedaan naar de bereikbaarheid en is het niet bekend of de aanname dat deze verhoog moet worden, juist is.