Observation of infragravity wave processes near the coastal cliffs of Chabahar (Gulf of Oman)

Mahmoudof, Seyed Masoud; Azizpour, Jafar; Eyhavand-Koohzadi, Amin

doi:10.1016/j.ecss.2021.107226

Cited by 11 publications

(2 citation statements)

References 49 publications

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“…Other processes that may lead to these periods of unsatisfactory performance can be waves of different frequencies built upon wind waves and enhanced due to the topographic and bathymetric features of the bay itself, for example, the infragavity waves or seiches play a relevant role in an embayment and estuarine areas (Cerralbo et al., 2014; Mahmoudof et al., 2021; Melito et al., 2020). However, it is believed these processes are not the dominant mechanisms because if it was, unsatisfactory performance should appear periodically.…”

Section: Discussionmentioning

confidence: 99%

Improved Prediction of Local Significant Wave Height by Considering the Memory of Past Winds

Zhang

Yang

Zhang

et al. 2023

Water Resources Research

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Wave and water depth were measured with an instrumented tripod in the Yellow River Delta from 9 December 2014 to 29 April 2015. Concurrent wind data were also collected from a nearby wind station. A high‐precision model for predicting local significant wave height (Hs) with wind speed (vw) is constructed using an improved data‐driven approach. The proposed model realized high accuracy as it solves the problem that the Hs falls too fast during the wind‐decreasing periods. It was tackled by considering the remaining influence of historical vw on the present Hs via incorporating a memory curve of the past wind effect. This innovative approach significantly improves the prediction (R2 from 0.60 to 0.83). The winds in the past 24 hr still left an influence on the waves at the observation site although the influence decreases with time. Physically, it is an implicit but simpler consideration of wind fetch/duration. Further data modeling experiments indicated that the decisive factor for the Hs at the site is the wind speed. Wind directions slightly improve the prediction, indicating that waves are slightly affected by the underwater seabed slope along different wind directions, and northwest winds cause the strongest waves at the site. Adding atmospheric pressure or water depth even reduces the accuracy, which indicated that storm surges and wave deformations under different tide levels have a weak impact on Hs. The proposed local wave model can be easily constructed with available wind and wave data, making it expandable to other regions dominated by wind waves.

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Section: Discussionmentioning

confidence: 99%

Improved Prediction of Local Significant Wave Height by Considering the Memory of Past Winds

Zhang

Yang

Zhang

et al. 2023

Water Resources Research

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“…For this investigation, continuous observations for approximately 1 year or more were made at three different sites along the east coast of South Korea. At each site, wave gauges were deployed at different depths from an intermediate depth to the surf zone, where the correlation between SWs and IGWs was consistently observed (Herbers et al, 1995b;Ruessink, 1998;Mahmoudof et al, 2021), unlike the inside of the surf zone, where IGW transformation was significantly affected by the topography (Munk, 1949;Herbers et al, 1995a;Sheremet, 2002). Therefore, at these three sites, observing the IGW growth through a comparison of the results between the different sites is effective.…”

Section: Introductionmentioning

confidence: 99%

Infragravity wave height dependency on short wave parameters – observations on the east coast of South Korea

Chang

Ryu

et al. 2023

Front. Mar. Sci.

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Infragravity waves (IGWs) that have lower wave frequencies than short waves (SWs) can cause significant impacts on coastal processes, such as beach erosion, when their amplitude increases toward the shore, specifically under energetic wave conditions. Therefore, it is important to precisely predict IGW shoaling based on SW conditions for scientific and engineering purposes. In this study, shoaling of IGWs was observed at three different sites along the east coast of South Korea based on continuous wave observations at various water depths. The nearshore IGW shoaling was dominant over the SWs, which was likely due to the energy transfer between the SWs and IGWs. Two types of SW parameters were employed to examine their correlations with IGWs, and linear dependences were observed for both types. However, the determination coefficient showed the opposite pattern between the two types, as it increased with decreasing depth with the wave energy flux. The comparison showed that the energy flux could be a preferred parameter type to represent the correlations of the IGW height in these calculations, as one formula could be developed for the depth-dependent proportional coefficients of the linear correlations when the energy flux was used. However, a discrepancy was also observed in the magnitude of the proportional coefficients, indicating that the IGW height over the SW parameters was higher in the sandy beaches than in the rocky seabed. Therefore, it could be assumed that seabed conditions may be an important factor for the process of IGW shoaling, but further evidence is needed.

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Field study of wave reflection from permeable rubble mound breakwater of Chabahar Port

Mahmoudof

Eyhavand-Koohzadi

Bagheri³

2021

Applied Ocean Research

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Observation of infragravity wave processes near the coastal cliffs of Chabahar (Gulf of Oman)

Cited by 11 publications

References 49 publications

Improved Prediction of Local Significant Wave Height by Considering the Memory of Past Winds

Improved Prediction of Local Significant Wave Height by Considering the Memory of Past Winds

Infragravity wave height dependency on short wave parameters – observations on the east coast of South Korea

Field study of wave reflection from permeable rubble mound breakwater of Chabahar Port

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