scholarly journals Mega-Ship-Generated Tsunami: A Field Observation in Tampa Bay, Florida

2021 ◽  
Vol 9 (4) ◽  
pp. 437
Author(s):  
Ping Wang ◽  
Jun Cheng

The displacement of a large amount of water in a moderate-sized estuary by a fast-moving mega-ship can generate tsunami-like waves. Such waves, generated by cruise ships, were observed in Tampa Bay, Florida, USA. Two distinct, long tsunami-like waves were measured, which were associated with the passage of a large cruise ship. The first wave had a period of 5.4 min and a height of 0.40 m near the shoreline. The second wave had a period of 2.5 min and was 0.23 m high. The peak velocity of the onshore flow during the second wave reached 0.65 m/s. The shorter, second wave propagated considerably faster than the first wave in the breaking zone. The measured wave celerity was less than 50% of the calculated values, using the shallow water approximation of the dispersion equation, suggesting that nonlinear effects play an important role. A fundamental similarity among the generation of tsunamis, as induced by mega-ships, landslides or earthquakes, is a process that causes a vertical velocity at the sea surface, where a freely propagating wave is produced. This mega-ship-generated tsunami provides a prototype field laboratory for systematically studying tsunami dynamics, particularly the strong turbulent flows associated with the breaking of a tsunami wave in the nearshore, and tsunami–land interactions. It also provides a realistic demonstration for public education, which is essential for the preparation and management of this unpreventable hazard.

2021 ◽  
Author(s):  
Michael Poulsen

<p><strong>Monitoring Svalbard’s environment and cultural heritage through citizen science by expedition cruises</strong></p><p>Michael K. Poulsen1, Lisbeth Iversen2, Ted Cheeseman3, Børge Damsgård4, Verena Meraldi5, Naja Elisabeth Mikkelsen6, Zdenka Sokolíčková7, Kai Sørensen8, Agnieszka Tatarek9, Penelope Wagner10, Stein Sandven2, and Finn Danielsen1</p><p>1NORDECO, 2NERSC, 3PCSC, 4UNIS, 5Hurtigruten, 6GEUS, 7University of Oslo, 8NIVA, 9IOPAN, 10MET Norway</p><p><strong>Why expedition cruise monitoring is important for Svalbard. </strong>The Arctic environment  is changing fast, largely due to increasing temperatures and human activities. The continuous areas of wilderness and the cultural heritage sites in Svalbard need to be managed based on a solid understanding.</p><p>The natural environment of Svalbard is rich compared to other polar regions. Historical remains are plentiful. The Svalbard Environmental Protection Act aims at regulating hunting, fishing, industrial activities, mining, commerce and tourism. Expedition cruises regularly reach otherwise rarely visited places.</p><p><strong>Steps taken to improve environmental monitoring. </strong>A workshop for enhancing the environmental monitoring efforts of expedition cruise ships was held in Longyearbyen in 2019, facilitated by the INTAROS project and the Association of Arctic Expedition Cruise Operators  (https://intaros.nersc.no/content/cruise-expedition-monitoring-workshop) with representatives of cruise operators, citizen science programs, local government and scientists. They agreed on a pilot assessment of monitoring programs during 2019.</p><p><strong>Results show the importance of cruise ship observations. </strong>The provisional findings of the pilot assessment suggest thatexpedition cruises go almost everywhere around Svalbard and gather significant and relevant data on the environment, contributing for example to an improved understanding of thestatus and distribution of wildlife. Observations are often documented with photographs. More than 150 persons contributed observations during 2019 to eBird and Happywhale. iNaturalist, not part of the pilot assessment, also received many contributions. The pilot assessment was unable to establish a useful citizen science program for testing monitoring of cultural remains.</p><p><strong>Conclusions relevant for monitoring and environmental management. </strong>Cruise ships collect environmental data that are valuable for the scientific community and for public decision-makers. The Governor of Svalbard isresponsible for environmental management in Svalbard. Data on the environment and on cultural remains from expedition cruises can be useful for the Governor’s office. Improved communication between citizen science programs and those responsible for environmental management decisions is likely to increase the quantity of relevant information that reaches public decision makers.</p><p><strong>Recommendations for improving the use of cruise ship observations and monitoring.</strong></p><ul><li>1) All cruise expedition ships should be equipped with tablets containing the apps for the same small selection of citizen scienceprograms so that they can easily upload records.</li> <li>2) Evaluation of data that can be created and how such data can contribute to monitoring programs, to ensure that data is made readily available in a form that is useful for institutions responsible for planning and improving environmental management.</li> <li>3) Clear lines of communication between citizen science program participants, citizen science program organizers, the scientific community and decision makers should be further developed.</li> <li>4) Developing expedition cruise monitoring is of high priority in Svalbard, but is also highly relevant to other polar regions.</li> <li>5) Further work is necessary to fully understand the feasibility and potential of coordinated expedition cruise operator based environmental observing in the Arctic.</li> </ul>


1991 ◽  
Vol 113 (4) ◽  
pp. 644-653 ◽  
Author(s):  
G. D. Power ◽  
J. M. Verdon ◽  
K. A. Kousen

The development of an analysis to predict the unsteady compressible flows in blade boundary layers and wakes is presented. The equations that govern the flows in these regions are transformed using an unsteady turbulent generalization of the Levy–Lees transformation. The transformed equations are solved using a finite difference technique in which the solution proceeds by marching in time and in the streamwise direction. Both laminar and turbulent flows are studied, the latter using algebraic turbulence and transition models. Laminar solutions for a flat plate are shown to approach classical asymptotic results for both high and low-frequency unsteady motions. Turbulent flat-plate results are in qualitative agreement with previous predictions and measurements. Finally, the numerical technique is also applied to the stator and rotor of a low-speed turbine stage to determine unsteady effects on surface heating. The results compare reasonably well with measured heat transfer data and indicate that nonlinear effects have minimal impact on the mean and unsteady components of the flow.


Polar Record ◽  
2010 ◽  
Vol 47 (1) ◽  
pp. 80-85 ◽  
Author(s):  
Helmut W. Hoyme ◽  
Victor Benno Meyer-Rochow

ABSTRACTOver a period of 142 days of polar cruising, all visits and reasons for those visits to the on board ship doctor's surgery by 360 crew members and 497 passengers were recorded and analysed. Despite the difference in age structure (passengers were mostly 60 years of age or older, while the crew were predominantly 20–30 years old), typically geriatric problems were seen in only a few passengers. While common cold related complaints dominated in the crew members, the passengers suffered more frequently from sea- and motion sickness and had slightly more respiratory and orthopaedic complaints. Typically cold weather related problems like hypothermia and frostbite were hardly seen at all and total prostheses of hips and knees (which involved several passengers) stood up surprisingly well to the polar climate and terrain. The surprisingly good physical condition of the elderly passengers suggests that the clientele of polar cruises represents an overall ‘fitter’ and healthier sub-population of elderly people. The on board preparatory lectures, warning the passengers of possible risks ashore and on board, must also have helped to keep down incidences requiring medical attention. A doctor, serving as an on-board physician on a cruise ship in polar waters, needs to be aware that the majority of his/her potential patients will be elderly folk. Familiarisation with facilities, medical equipment and drugs on board prior to departure is essential. The cruise ship doctor in addition to emergency experience needs experience in treating dermal disorders and orthopaedic conditions. Skills in chiropractic measures and/or acupuncture are an advantage and a thorough knowledge of cold weather induced conditions is a must.


2021 ◽  
pp. 1-19
Author(s):  
Cheng-Wen Lee ◽  
Chi-Hsi Wang

Abstract In this research, the sustainability and global sourcing competitiveness of international cruise ships is studied. The sustainability and competitiveness is just like two sides of a coin. On one hand, reducing the pollution and raw material waste is not only to protect our precious nature resources, but also to bring the cost down. On the other hand, a good global sourcing decision could deliver the cost saving and also keep the cruise ship industry towards the sustainable way. Therefore, in order to reach the goals of sustainability and competitiveness, the cruise ships may apply the current common practice of value analysis and value engineering to identify the possible global sourcing opportunity. This short exploratory paper outlines some of the characteristics of value analysis and value engineering, as illustrated by sustainability of global sourcing competitiveness. Eventually, the discussion of this paper provides some implications for international cruise ship companies. JEL classification numbers: F16, F60, Q23. Keywords: Value Analysis, Value Engineering, Sustainability, Global Sourcing.


2021 ◽  
Author(s):  
Elena Cecilia Rosca ◽  
Carl Heneghan ◽  
Elizabeth A Spencer ◽  
Jon Brassey ◽  
Annette Pluddemann ◽  
...  

Background: Maritime and river travel, including cruise ships, have been implicated with spreading viruses through infected passengers and crew. Given the novelty of the SARS-CoV-2 infection, early cruise ship travel transmission models of spread are based on what is known of the dynamics of other respiratory viral infections. Our objective is to provide a rapid summary and evaluation of relevant data on SARS-CoV-2 transmission aboard cruise ships, report policy implications, and highlight research gaps requiring attention. Methods: We will search LitCovid, medRxiv, Google Scholar, and the WHO Covid-19 database using COVID-19, SARS-CoV-2, transmission, and cruise ship appropriate synonyms. We will also search the reference lists of included studies for additional relevant studies. We will include studies reporting onboard SARS-CoV-2 transmission from passengers and/or crew to passengers and/or crew. We will consider any potential transmission mode. We will assess study quality based on five criteria and report important findings. The outcome will consist of the onboard cruise ships transmission of SARS-CoV-2. We will provide a narrative summary of the data and report the outcomes, including quantitative estimates where feasible and relevant. Where possible, compatible datasets may be pooled for meta-analysis. Expected results: We will present the evidence in three distinct packages: study description, methodological quality assessment and data extracted. We will summarize the evidence and will draw conclusions as to the quality of the evidence.


2020 ◽  
Author(s):  
Yu-Ching Chou ◽  
Yu-Ju Lin ◽  
Shian-Sen Shie ◽  
Hung-Bin Tsai ◽  
Wang-Huei Sheng

Abstract The COVID-19 pandemic broke out in Wuhan, China, and declared an international public health emergency by the World Health Organization in 2019. It mainly manifests as symptoms of respiratory infections, and severe cases can cause pneumonia and death. The Diamond Princess cruise ship outbroke cluster infection outside China during the early pandemic. The incident occurred on February 1, 2020, and an 80-year-old Hong Kong man was diagnosed with COVID-19. The cruise docked in Yokohama, Japan, for 14 days on-board quarantine; however, cluster infection outbroke rapidly. The results show that after 14 days of quarantine, 634 (17.1%) cases were diagnosed with a total of 3,711 population, and 328 (51.7%) cases were asymptomatic. As of April 24, 2020, 712 cases have been diagnosed and 14 deaths have occurred. A cumulative mortality rate reaches 1.96%. Using a nonlinear least-squares curve fitting with Microsoft Excel Solver, we obtain the parameters of the SIR mathematical model of infectious disease and the reproduction number (R0) of the COVID-19 outbreak is 2.37±0.26. Without an emergency evacuation plan, the total infection rate will reach 88.47%. These data show “only one” COVID-19 case could still outbreak cluster infection on large cruise ships. The possible causes and countermeasures are discussed.


2020 ◽  
Vol 12 (17) ◽  
pp. 6968 ◽  
Author(s):  
Aleksandar Radic ◽  
Rob Law ◽  
Michael Lück ◽  
Haesang Kang ◽  
Antonio Ariza-Montes ◽  
...  

The current COVID-19 cruise tourism crisis has evolved to epic proportions and placed some of the cruise lines on the verge of bankruptcy. This research aimed to gain a deeper understanding of the crisis. Using an inductive qualitative approach, interviews were conducted with eight frequent cruisers who were at home and eight cruise ship employees who were employed by various cruise companies and who were working on cruise ships during the COVID-19 cruise tourism crisis. The findings revealed a systematic failure within the cruise industry management to understand the COVID-19 pandemic. Results of this study highlight the importance of health-related perceived risks on the nature and impact of the COVID-19 cruise tourism crisis. This study supports the overall theory of cruise tourism and crisis management by extending the chaos theory and its principals on the COVID-19 cruise tourism crisis. The managerial implications for cruise lines are outlined.


2013 ◽  
Vol 13 (16) ◽  
pp. 8401-8409 ◽  
Author(s):  
S. Eckhardt ◽  
O. Hermansen ◽  
H. Grythe ◽  
M. Fiebig ◽  
K. Stebel ◽  
...  

Abstract. In this study we have analyzed whether tourist cruise ships have an influence on measured sulfur dioxide (SO2), ozone (O3), Aitken mode particle and equivalent black carbon (EBC) concentrations at Ny Ålesund and Zeppelin Mountain on Svalbard in the Norwegian Arctic during summer. We separated the measurement data set into periods when ships were present and periods when ships were not present in the Kongsfjord area, according to a long-term record of the number of passengers visiting Ny Ålesund. We show that when ships with more than 50 passengers cruise in the Kongsfjord, measured daytime mean concentrations of 60 nm particles and EBC in summer show enhancements of 72 and 45%, respectively, relative to values when ships are not present. Even larger enhancements of 81 and 72% were found for stagnant conditions. In contrast, O3 concentrations were 5% lower on average and 7% lower under stagnant conditions, due to titration of O3 with the emitted nitric oxide (NO). The differences between the two data subsets are largest for the highest measured percentiles, while relatively small differences were found for the median concentrations, indicating that ship plumes are sampled relatively infrequently even when ships are present although they carry high pollutant concentrations. We estimate that the ships increased the total summer mean concentrations of SO2, 60 nm particles and EBC by 15, 18 and 11%, respectively. Our findings have two important implications. Firstly, even at such a remote Arctic observatory as Zeppelin, the measurements can be influenced by tourist ship emissions. Careful data screening is recommended before summertime Zeppelin data is used for data analysis or for comparison with global chemistry transport models. However, Zeppelin remains as one of the most valuable Arctic observatories, as most other Arctic observatories face even larger local pollution problems. Secondly, given landing statistics of tourist ships on Svalbard, it is suspected that large parts of the Svalbard archipelago are affected by cruise ship emissions. Thus, our results may be taken as a warning signal of future pan-Arctic conditions if Arctic shipping becomes more frequent and emission regulations are not strict enough.


2018 ◽  
Vol 5 (3) ◽  
pp. 170602 ◽  
Author(s):  
S. Towers ◽  
J. Chen ◽  
C. Cruz ◽  
J. Melendez ◽  
J. Rodriguez ◽  
...  

Norovirus is a common cause of outbreaks of acute gastroenteritis in health- and child-care settings, with serial outbreaks also frequently observed aboard cruise ships. The relative contributions of environmental and direct person-to-person transmission of norovirus have hitherto not been quantified. We employ a novel mathematical model of norovirus transmission, and fit the model to daily incidence data from a major norovirus outbreak on a cruise ship, and examine the relative efficacy of potential control strategies aimed at reducing environmental and/or direct transmission. The reproduction number for environmental and direct transmission combined is R 0 tot = 7.2 [6.1,9.5], and of environmental transmission alone is R 0 environ = 1.6 [0.9,2.6]. Direct transmission is overwhelmingly due to passenger-to-passenger contacts, but crew can act as a reservoir of infection from cruise to cruise. This is the first quantification of the relative roles of environmental and direct transmission of norovirus. While environmental transmission has the potential to maintain a sustained series of outbreaks aboard a cruise ship in the absence of strict sanitation practices, direct transmission dominates. We find that intensive promotion of good hand washing practices may prevent outbreaks. Isolation of ill passengers and cleaning are beneficial, but appear to be less efficacious at outbreak control.


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