Dynamic Mooring Analysis. Condition

Dynamic Mooring Analysis. Conditions during Mooring Service Types III and IV, and during extreme events can be highly dynamic. Unfortunately, the dynamic behavior of a moored ship in shallow water can be highly complex, so dynamics cannot be fully documented in this UFC. An introduction to dynamics is provided in Chapter 8. Information on dynamics is found in: Dynamic Analysis of Moored Floating Drydocks, Headland et. al. (1989); Advanced Dynamics of Marine Structures, Hooft (1982); Hydrodynamic Analysis and Computer Simulation Applied to Ship Interaction During Maneuvering in Shallow Channels, Kizakkevariath (1989); David Taylor Research Center (DTRC), SPD-0936-01, User’s Manual for the Standard Ship Motion Program, SMP81; Low Frequency Second Order Wave Exciting Forces on Floating Structures, Pinkster (1982); Mooring Dynamics Due to Wind Gust Fronts, Seelig and Headland (1998); and A Simulation Model for a Single Point Moored Tanker, Wichers (1988). Some conditions when mooring dynamics may be important to design or when specialized considerations need to be made are given in Table 3-10.
The programs AQWA DRIFT and AQWA NAUT (Century Dynamics, Houston, TX) are examples of software tools that can be used to simulate highly dynamic mooring situations.
3-4 RISK. Risk is a concept that is often used to design facilities, because the probability of occurrence of extreme events (currents, waves, tides, storm surge, earthquakes, etc.) is strongly site dependent. Risk is used to ensure that systems are reliable, practical, and economical.
A common way to describe risk is the concept of ‘return interval’, which is the mean length of time between events. For example, if the wind speed with a return interval of R = 100 years is given for a site, this wind speed would be expected to occur, on the average, once every 100 years. However, since wind speeds are probabilistic, the specified 100-year wind speed might not occur at all in any 100-year period. Or, in any 100-year period the wind speed may be equal to or exceed the specified wind speed multiple times.
The probability or risk that an event will be equaled or exceeded one or more times during any given interval is determined from:

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Dynamic Mooring Analysis. Conditions during Mooring Service Types III and IV, and during extreme events can be highly dynamic. Unfortunately, the dynamic behavior of a moored ship in shallow water can be highly complex, so dynamics cannot be fully documented in this UFC. An introduction to dynamics is provided in Chapter 8. Information on dynamics is found in: Dynamic Analysis of Moored Floating Drydocks, Headland et. al. (1989); Advanced Dynamics of Marine Structures, Hooft (1982); Hydrodynamic Analysis and Computer Simulation Applied to Ship Interaction During Maneuvering in Shallow Channels, Kizakkevariath (1989); David Taylor Research Center (DTRC), SPD-0936-01, User’s Manual for the Standard Ship Motion Program, SMP81; Low Frequency Second Order Wave Exciting Forces on Floating Structures, Pinkster (1982); Mooring Dynamics Due to Wind Gust Fronts, Seelig and Headland (1998); and A Simulation Model for a Single Point Moored Tanker, Wichers (1988). Some conditions when mooring dynamics may be important to design or when specialized considerations need to be made are given in Table 3-10.The programs AQWA DRIFT and AQWA NAUT (Century Dynamics, Houston, TX) are examples of software tools that can be used to simulate highly dynamic mooring situations.3-4 RISK. Risk is a concept that is often used to design facilities, because the probability of occurrence of extreme events (currents, waves, tides, storm surge, earthquakes, etc.) is strongly site dependent. Risk is used to ensure that systems are reliable, practical, and economical.Cara yang umum untuk menggambarkan risiko adalah konsep 'kembali interval', yang berarti jangka waktu antara peristiwa. Misalnya, jika angin kecepatan dengan interval kembali r = 100 tahun yang diberikan untuk sebuah situs, kecepatan angin ini akan diharapkan untuk terjadi, rata-rata, sekali setiap 100 tahun. Namun, karena kecepatan angin probabilistik, kecepatan angin 100 tahun tertentu mungkin tidak muncul sekali dalam setiap periode 100 tahun. Atau, dalam setiap periode 100 tahun kecepatan angin dapat sama atau melebihi kecepatan angin tertentu beberapa kali.Probabilitas atau risiko bahwa acara akan setara atau melebihi satu atau lebih kali selama interval tertentu apapun ditentukan dari: