scholarly journals Analysis of Dangerous Sea States in the Northwestern Mediterranean Area

2021 ◽  
Vol 9 (4) ◽  
pp. 422
Author(s):  
Alessio Innocenti ◽  
Miguel Onorato ◽  
Carlo Brandini
Keyword(s):  
Extreme Events ◽  
Mediterranean Area ◽  
Rayleigh Distribution ◽  
Surface Elevation ◽  
Wave Steepness ◽  
Sea Waves ◽  
Operational Forecasts ◽  
Long Time ◽  
Simulated Field

Extreme sea waves, although rare, can be notably dangerous when associated with energetic sea states and can generate risks for the navigation. In the last few years, they have been the object of extensive research from the scientific community that helped with understanding the main physical aspects; however, the estimate of extreme waves probability in operational forecasts is still debated. In this study, we analyzed a number of sea-states that occurred in a precise area of the Mediterranean sea, near the location of a reported accident, with the objective of relating the probability of extreme events with different sea state conditions. For this purpose, we performed phase-resolving simulations of wave spectra obtained from a WaveWatch III hindcast, using a Higher Order Spectral Method. We produced statistics of the sea-surface elevation field, calculating crest distributions and the probability of extreme events from the analysis of a long time-series of the surface elevation. We found a good matching between the distributions of the numerically simulated field and theory, namely Tayfun second- and third- order ones, in contrast with a significant underestimate given by the Rayleigh distribution. We then related spectral quantities like angular spreading and wave steepness to the probability of occurrence of extreme events finding an enhanced probability for high mean steepness seas and narrow spectra, in accordance with literature results, finding also that the case study of the reported accident was not amongst the most dangerous. Finally, we related the skewness and kurtosis of the surface elevation to the wave steepness to explain the discrepancy between theoretical and numerical distributions.

Numerical analysis of extreme waves in the North-Western Mediterranean area

2021 ◽  
Author(s):  
Alessio Innocenti ◽  
Carlo Brandini
Keyword(s):  
Extreme Events ◽  
Mediterranean Area ◽  
Rayleigh Distribution ◽  
Western Mediterranean ◽  
Surface Elevation ◽  
Wave Steepness ◽  
Sea Waves ◽  
Sea State ◽  
The North ◽  
Operational Forecasts

<p>Extreme sea waves have a great impact on the safety of navigation and coastal areas, however their prediction in operational forecasts is difficult and is generally based on spectral indices. Numerical simulations of the free surface Euler equations can be of notable help in the understanding of the statistical properties of a given sea state, and therefore to establish also the probability of extreme or rare events. In this study we performed phase-resolved simulations of wave spectra obtained from a WaveWatch III hindcast, using a Higher Order Spectral Method. We analyzed a number of sea-states occurred in a precise area of the Mediterranean sea, near the location of a reported accident, with the objective of relating the probability of extreme events with different sea state conditions. Namely, we produced statistics of the wave field, calculating crest distributions and the probability of extreme events from the analysis of long time-series of the surface elevation. The results show a good matching between the distributions of the numerically simulated field and theory, namely Tayfun second- and third- order ones, while the Rayleigh distribution gives a significant underestimate.<span> </span></p><p>We looked for several kind of correlations between spectral quantities like angular spreading and wave steepness and the probability of occurrence of extreme events, finding an enhanced probability for high mean steepness seas and narrow spectra. It is also evident how the case study of the reported accident was not amongst the most dangerous sea states.<span> </span>Relating the skewness and kurtosis of the surface elevation to the wave steepness helped us to understand the discrepancy between theoretical and numerical distributions.</p>

A new approach to detect extreme events: a case study using remotely-sensed precipitation time-series data

2021 ◽  
Vol 24 ◽  
pp. 100618
Author(s):  
Philipe Riskalla Leal ◽  
Ricardo José de Paula Souza e Guimarães ◽  
Fábio Dall Cortivo ◽  
Rayana Santos Araújo Palharini ◽  
Milton Kampel
Keyword(s):  
Time Series ◽  
Extreme Events ◽  
Time Series Data ◽  
Remotely Sensed ◽  
Series Data ◽  
Precipitation Time Series ◽  
New Approach

A comparative multidimensional evaluation of conservation agriculture systems: A case study from a Mediterranean area of Southern Italy

2017 ◽  
Vol 68 ◽  
pp. 326-333 ◽  
Author(s):  
Antonella Vastola ◽  
Pandi Zdruli ◽  
Mario D’Amico ◽  
Gioacchino Pappalardo ◽  
Mauro Viccaro ◽  
...  
Keyword(s):  
Southern Italy ◽  
Conservation Agriculture ◽  
Mediterranean Area ◽  
Multidimensional Evaluation ◽  
Agriculture Systems

scholarly journals Changing pattern of forest consumption: a case study from an eastern hill village in Nepal

1970 ◽  
Vol 8 ◽  
pp. 41-58 ◽  
Author(s):  
Binod Pokharel
Keyword(s):  
Long Time

The PDF of this file is 2,541 kbytes in size and therefore will take a long time to download if you click on the PDF link below. If you would like the file to be sent to you by email, please send a request to [email protected]. Please include the citation below in your request. DOI: 10.3126/opsa.v8i0.1120Occasional Papers in Sociology and Anthropology Vol.8 2003 p.41-58

scholarly journals Agriculture and ritual landscape: A case study from the Magars of Argal, Baglung District, Nepal

1970 ◽  
Vol 8 ◽  
pp. 88-104
Author(s):  
Man Bahadur Khattri
Keyword(s):  
Long Time ◽  
Ritual Landscape

The PDF of this file is 2,357 kbytes in size and therefore will take a long time to download if you click on the PDF link below. If you would like the file to be sent to you by email, please send a request to [email protected]. Please include the citation below in your request. DOI: 10.3126/opsa.v8i0.1123Occasional Papers in Sociology and Anthropology Vol.8 2003 p.88-104

Impact assessment of climate change on farming systems in the South Mediterranean area: a Tunisian case study

2017 ◽  
Vol 18 (3) ◽  
pp. 637-650 ◽  
Author(s):  
Imen Souissi ◽  
Jean Marie Boisson ◽  
Insaf Mekki ◽  
Olivier Therond ◽  
Guillermo Flichman ◽  
...  
Keyword(s):  
Climate Change ◽  
Impact Assessment ◽  
Farming Systems ◽  
Mediterranean Area ◽  
The South

scholarly journals Leadership Style, Ethics, and Strategy in Indonesian Navy - Case Study: Leadership of Rear Admiral Agung Prasetiawan, M.AP, (2017-Present) Commander of Kolinlamil

2017 ◽  
Vol 7 (4) ◽  
pp. 121
Author(s):  
Faurna Lusiani Pakpahan ◽  
Hady Efendy
Keyword(s):  
Leadership Style ◽  
Main Task ◽  
Organizational Goals ◽  
Important Thing ◽  
Long Time ◽  
Organization Leadership ◽  
Military Institution ◽  
The Right

In an organization, leadership in an organization exists from a long time ago to the present, and leadership is a very important thing. A leader must use the right style to lead the organization he leads. The leader must also have good ethics in leading the organization and use appropriate strategies, so that organizational goals can be achieved. The purpose of this paper is to find out how much influence of leadership style, ethics and strategy what is used by an organization leader in a military institution that is Navy at Tanjung Priok Command Military Traffic (Kolinlamil) Jakarta, to be able to achieve organizational goals under leadership of Rear Admiral Agung Prasetiawan, M.AP. Kolinlamil is the main command in coaching and operations, which in the field of guidance of Kolinlamil is directly under the head a navy staff (Kasal), while the field of operations is directly under the Commander of the Indonesian Military (TNI). Kolinlamil is a military institution whose main task is to shift military or civilian forces from one area to another based on existing rules and orders.

scholarly journals Online Social Gambling and Its Implications for the Study of Marketing Communications

2015 ◽  
Vol 4 (3) ◽  
pp. 22-50 ◽  
Author(s):  
Wilson Ozuem ◽  
Jason Prasad
Keyword(s):  
Single Case ◽  
Internet Technology ◽  
Marketing Communication ◽  
Single Case Study ◽  
New Approach ◽  
Real Money ◽  
Long Time ◽  
Ancient Times ◽  
Communication Practices

Gambling has been a part of humanity for a long time, and references to it have been found in some of the earliest dated records. Literature on the topic has been accumulating since ancient times. The advent of Internet technology along with its typical subsets provides a new approach to how gambling is conducted in postmodern times. Drawing on qualitative research and utilising a single case study strategy, this study examines online social gambling and real money gambling marketing communication practices as well as offers some insights into the development and implementation of effective marketing communication programmes. In contrast to existing studies, the paper, in part, proposes integrative and higher levels of marketing communication programmes between online social gambling and real money gambling environments.

scholarly journals DECISION TREE C4.5 ALGORITHM FOR TUITION AID GRANT PROGRAM CLASSIFICATION (CASE STUDY: DEPARTMENT OF INFORMATION SYSTEM, UNIVERSITAS TEKNOKRAT INDONESIA)

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Heni Sulistiani ◽  
Ahmad Ari Aldino
Keyword(s):  
Decision Tree ◽  
Classification Model ◽  
Grant Program ◽  
C4.5 Algorithm ◽  
Long Time ◽  
The Right ◽  
Short Time ◽  
Tuition Fee

In pandemic era, almost everyone struggles for their life. College students are such example. They have difficulty in paying tuition fee to continue their study. Based on this problematic situation, Universitas Teknokrat Indonesia grants the students who have good academic performance with tuition fee aid program. Many variables used for determining the grant made it hard to make a decision in a short time or even takes very long time. To make it easier for management to decide who is the right student to get grant, it needs classification model. The purpose of this study is the classification of grant recipients by using decision tree C4.5 algorithm. That can determine whether a potential student can be accepted as an awardee or not. Then, the results of the classification are validated with ten-fold cross validation with an accuracy, precision and recall with the score of 87 % for all part. It means the model perform quite well to be implemented into system.

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