EXPERIMENTAL INVESTIGATION AND DETERMINATION OF REFLECTION COEFFICIENTS OF IRREGULAR WAVES FROM RESHAPING BREAKWATERS

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SHIRIAN N.; SHAFEI FAR M.; AGHTOUMAN P.; CHEGINI V.

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Journal: Year:2005 | Volume:17 | Issue:1 (66 IN NATURAL RESOURCES) Page(s): 68-77

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Title

EXPERIMENTAL INVESTIGATION AND DETERMINATION OF REFLECTION COEFFICIENTS OF IRREGULAR WAVES FROM RESHAPING BREAKWATERS

Author(s)

SHIRIAN N. | SHAFEI FAR M. | AGHTOUMAN P. | CHEGINI V. | Issue Writer Certificate

Keywords

RESHAPING BREAKWATERSQ4

WAVE REFLECTIONQ4

RUBBLE MOUNDQ3

EXPERIMENTAL MODELINGQ4

IRREGULAR WAVESQ4

AND REFLECTION COEFFICIENTQ4

Abstract

In this research the effects of irregular Ware,s reflection from the reshaping rubblemound breakwaters were investigated. Reshaping breakwater is a kind of new breakwaters, which its initial profile is changed to a (S) shaped one after impacting of waves. Therefore, the relations related to reflection coefficients on conventional breakwaters cannot be used for this type of structure. Method of research was based on EXPERIMENTAL MODELING. Experiments were done for multiple cross sections of RESHAPING BREAKWATERS with three different slopes in the Soil Conservation and Watershed Management Research Institute (SCWMRI) wave Flume, during 2003 to 2004. The wave flume equipped with a modem DHI wave generation system, which contains paddle, power pack, hardware and software divisions. The hydraulic response that mentioned above, were investigated by changing the wave parameters such as significant wave height, mean and peak wave period and storm duration on the three structure's seaward slopes, equal to 1:1.25, 1:2.0, 1:2.5. JONSWAP wave spectrum was used in all experiments. The Armoure layer materials were included in three grading class (Dn85A/Dn15A=1.14,1.44,1.82) and a Range of structural notional permeability index Pe (1≤D50A/D50C≤20) In order to changing structural geometry, wave properties and comparison between two scales (A = 50,30) , 120 tests were done with 1000 to 6000 waves in this research. At the end, comparisons between the results of different scale factor were done. The experimental results were plotted as graphs showing the reflection coefficients versus the surf similarity parameter and deepwater wave steepness. because the Iribarren number does not accurately describe the combined effects of slope and wave steepness, an improved and new fit to data can be achieved using multiple linear regression and nonlinear regression which results in some new empirical equations which has been presented in this research.

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APA: Copy

SHIRIAN, N., SHAFEI FAR, M., AGHTOUMAN, P., & CHEGINI, V.. (2005). EXPERIMENTAL INVESTIGATION AND DETERMINATION OF REFLECTION COEFFICIENTS OF IRREGULAR WAVES FROM RESHAPING BREAKWATERS. PAJOUHESH-VA-SAZANDEGI, 17(1 (66 IN NATURAL RESOURCES)), 68-77. SID. https://sid.ir/paper/19778/en

Vancouver: Copy

SHIRIAN N., SHAFEI FAR M., AGHTOUMAN P., CHEGINI V.. EXPERIMENTAL INVESTIGATION AND DETERMINATION OF REFLECTION COEFFICIENTS OF IRREGULAR WAVES FROM RESHAPING BREAKWATERS. PAJOUHESH-VA-SAZANDEGI[Internet]. 2005;17(1 (66 IN NATURAL RESOURCES)):68-77. Available from: https://sid.ir/paper/19778/en

IEEE: Copy

N. SHIRIAN, M. SHAFEI FAR, P. AGHTOUMAN, and V. CHEGINI, “EXPERIMENTAL INVESTIGATION AND DETERMINATION OF REFLECTION COEFFICIENTS OF IRREGULAR WAVES FROM RESHAPING BREAKWATERS,” PAJOUHESH-VA-SAZANDEGI, vol. 17, no. 1 (66 IN NATURAL RESOURCES), pp. 68–77, 2005, [Online]. Available: https://sid.ir/paper/19778/en

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