In this study, when the stability of the structure against the ocean wave is considered for designing the offshore structures in the Pacific, Indian ocean and Atlantic regions where the cyclone is largely generated, the ocean wave caused by the cyclone as well as the storm surge which called wind in...
In this study, when the stability of the structure against the ocean wave is considered for designing the offshore structures in the Pacific, Indian ocean and Atlantic regions where the cyclone is largely generated, the ocean wave caused by the cyclone as well as the storm surge which called wind induced wave shall be predicted accurately for the purpose of judgment. The predicted wind induced wave was evaluated by comparing the outcome results the model test of Nobuhiro Matsunaga (1996) and Conventional Experiment forms such as Jonswap spectral forms(Carter, 1982), Simplified Donelan / Jonswap forms(Wilson 1965), Donelan spectral forms(Donelan 1980), Revised SPM forms(Schafer Lake 2005, 2007, 2008), SPM forms(CERC 1977), the CEM forms(Kazeminezhad et al., 2005), SMB forms(Sverdrup Munk and Bretschneider 1947,1954, 1970), and Revised Wilson forms(Wilson 1965, Goda 2003). Most of these conventional experiment forms confirmed a good match when the fetch length is less than 10 km. However, normal cyclone fetch length is more than 100km, With this fetch length, the comparison result is 10.4% of deviation when used Jonswap spectral forms(Carter, 1982) but the deviation of the other forms is around 74% due to boundary limit of fetch and wind duration. Therefore, in this study, we proposed the revised forms after comparing these results with the model results. We confirmed that the deviation range is around 10% based on revisited experiment forms. Since the model test was carried out in the small water tank, the scale up factor was applied to the mode test results in order to obtain similar results to the actual environment from revisited forms.
In this study, when the stability of the structure against the ocean wave is considered for designing the offshore structures in the Pacific, Indian ocean and Atlantic regions where the cyclone is largely generated, the ocean wave caused by the cyclone as well as the storm surge which called wind induced wave shall be predicted accurately for the purpose of judgment. The predicted wind induced wave was evaluated by comparing the outcome results the model test of Nobuhiro Matsunaga (1996) and Conventional Experiment forms such as Jonswap spectral forms(Carter, 1982), Simplified Donelan / Jonswap forms(Wilson 1965), Donelan spectral forms(Donelan 1980), Revised SPM forms(Schafer Lake 2005, 2007, 2008), SPM forms(CERC 1977), the CEM forms(Kazeminezhad et al., 2005), SMB forms(Sverdrup Munk and Bretschneider 1947,1954, 1970), and Revised Wilson forms(Wilson 1965, Goda 2003). Most of these conventional experiment forms confirmed a good match when the fetch length is less than 10 km. However, normal cyclone fetch length is more than 100km, With this fetch length, the comparison result is 10.4% of deviation when used Jonswap spectral forms(Carter, 1982) but the deviation of the other forms is around 74% due to boundary limit of fetch and wind duration. Therefore, in this study, we proposed the revised forms after comparing these results with the model results. We confirmed that the deviation range is around 10% based on revisited experiment forms. Since the model test was carried out in the small water tank, the scale up factor was applied to the mode test results in order to obtain similar results to the actual environment from revisited forms.
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제안 방법
The conventional forms have been revisited for some problems that the results can be quite different in the value of HS and TP depending on which forms they are applied. As shown in Table 4.1, this study modified the factor which was eliminated boundary fetch limit and wind duration time of the Simplified Donelan and Jonswap forms(Wilson 1965), Donelan spectral forms(Donelan 1980), Revised SPM forms(Schafer Lake 2005, 2007, 2008), SPM forms(CERC 1977), the CEM forms(Kazeminezhad et al., 2005), SMB forms(Sverdrup Munk and Bretschneider 1947,1954, 1970), and Revised Wilson forms(Wilson 1965, Goda 2003) based on the Model test results of Nobuhiro Matsunaga (1996) without Jonswap spectral forms(Carter, 1982). This study also proved the efficiency of the experiment forms by comparing the conventional experiment forms and the modified experiment forms with the Nobuhiro Matsunaga model test (1996).
The cyclone as shown in the above figure has a large impact on the offshore and coastal structure, so this study is indispensable. In the study, we modified and revisited the other experiment forms based on Nobuhiro Matsunaga model test results. As the results, the Jonswap spectral forms(Carter, 1982) with the smallest deviation, and other experiment forms had large deviations.
In this study, a scale factor was used to replace the test result with the wind waves generated in the actual environment. The Scale-up factor is shown in the following equations (3.
1 shows the map of areas in the world affected by tropical cyclones. In this study, we try to derive a correction forms that can predict precisely the wind induced waves using for design of offshore and coastal structures by proper analysis of model test and experiment forms.
The purpose of this study is not only to improve the problems of the conventional experiment forms which calculate wave affected by wind but also to modify an experiment forms for efficient calculation. The conventional forms have been revisited for some problems that the results can be quite different in the value of HS and TP depending on which forms they are applied.
2a, there is a large deviation between the conventional experiment forms. Therefore, revisited experiment forms based on model test were derived. As a result, revisited experiment forms were derived as shown in Figure 4.
, 2005), SMB forms(Sverdrup Munk and Bretschneider 1947,1954, 1970), and Revised Wilson forms(Wilson 1965, Goda 2003) based on the Model test results of Nobuhiro Matsunaga (1996) without Jonswap spectral forms(Carter, 1982). This study also proved the efficiency of the experiment forms by comparing the conventional experiment forms and the modified experiment forms with the Nobuhiro Matsunaga model test (1996).
This study presented the differences in the results of several experiment forms such as Jonswap, Donelan, Revised SPM, SPM, CEM, SMB, Wilson and modified them based on the Model test to derive efficient experiment forms that are not overestimated.
대상 데이터
This study use the results of model test performed by Nobuhiro Matsunaga (1996). Experiments were carried out by using a water tank equipped with an inhalation-type wind tunnel. Figure 3.
2 show a schematic diagram of the experimental apparatus. The tank was 32 m long, 0.6 m wide and 0.94 m high. A sloping bed was attached to the end of the tank as a beach model.
They were set 28 cm away. The wave signals were digitized at the intervals of 1/50 s and 16,384 data were sampled. Horizontal and vertical components of the wind-induced currents were obtained by using an electromagnetic current meter.
이론/모형
This study use the results of model test performed by Nobuhiro Matsunaga (1996). Experiments were carried out by using a water tank equipped with an inhalation-type wind tunnel.
성능/효과
Comparing the results of the conventional experiment forms and the model test, deviation for 74% of the results of HS and 51% of TP occurred. Also, when we compared the results using the Revisited experiment forms, the deviation for the results of HS and TP were 10.
참고문헌 (13)
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Manual describing the functions of the Coastal spreadsheet.
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