Landsat 8 Observation of the Internal Solitary Waves in the Lombok Strait

Karang, I Wayan Gede Astawa; Chonnaniyah, Chonnaniyah; Osawa, Takahiro

doi:10.22146/ijg.42655

Cited by 11 publications

(10 citation statements)

References 21 publications

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“…The ISW propagation speed estimation using MIC methods is 1.98 m.s -1 (A) in the Lombok Strait, 1.55 m.s -1 (B), and 1.57 m.s -1 (C) in the northern part of the strait. ISW propagation speed estimation results from this study are consistent with the previous investigation result in the Lombok Strait areas [1,[14][15][16]. Standard deviation of the three methods used in this study was 0.44 for the ISW packet (A) in the Lombok Strait and 0.33 for the ISW packets (B and C) in the northern part of the Lombok Strait.…”

Section: Resultssupporting

confidence: 90%

Internal solitary waves propagation speed estimation in the northern-part of Lombok Strait observed by Sentinel-1 SAR and Himawari-8 images

Chonnaniyah

Karang

Osawa

2021

IOP Conf. Ser.: Earth Environ. Sci.

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Remotely sensed data, both Synthetic Aperture Radar (SAR) and optical sensors, significantly contribute to the study and understanding internal solitary wave (ISW) dynamics in the ocean. Pairs of SAR and optical sensors were analyzed to estimate the ISW propagation speed in the northern-part of Lombok Strait. ISW propagation speed estimation used an image from Sentinel-1 SAR and three image pairs of Himawari-8 on 29 October 2018 with a time difference of 409 minutes. Sentinel-1 wide-swath imagery (250 km x 400 km) from two adjacent scenes can provide information on multiple ISW packets evolution in the northern-part of Lombok Strait. ISW propagation speed estimation on Sentinel-1 SAR image using the simple estimation by measuring the interpacket distance and dividing by the semidiurnal tidal period. The high temporal resolution of the optical sensor from Himawari-8 can estimate the ISW propagation speed using two different approaches. ISW propagation speed estimation using the semidiurnal tidal period from Sentinel-1 and Himawari-8 showed almost similar values. Sentinel-1 estimation results are 2.69 m.s−1 (Lombok Strait) and 1.30 m.s−1 (northern-part area), Himawari-8 results are 2.52 m.s−1 (Lombok Strait) and 1.27 m.s−1 (northern-part area). ISW propagation speed variability in the northern-part of the Lombok Strait shown in this study.

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Section: Resultssupporting

confidence: 90%

Internal solitary waves propagation speed estimation in the northern-part of Lombok Strait observed by Sentinel-1 SAR and Himawari-8 images

Chonnaniyah

Karang

Osawa

2021

IOP Conf. Ser.: Earth Environ. Sci.

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Section: Introductionmentioning

confidence: 99%

“…The internal tidal wave in the Lombok Strait has been detected using satellite images and model [5,6,7]. The strength of the internal tidal wave can be detected from sea surface as shown by using RADARSAT SAR imagery, for example in the southern part of Lombok Strait on 14 July and 7 August 1997 [6] and in period of 2014-2015 there were 14 internal solitary wave event were detected by Landsat 8 [7]. The internal solitary wave in the Lombok Strait propagate to the northern (arc-like internal wave type) and southern part (irregular internal wave type) of the sill and it will deflect when go further out of the strait [7].…”

Section: Introductionmentioning

confidence: 99%

Turbulent mixing process in the Lombok Strait

Naulita

Natih

Nabil

2021

IOP Conf. Ser.: Earth Environ. Sci.

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Turbulent mixing process in the Lombok Strait was evaluated from density inversions in CTD (Conductivity Temperature Depth) profiles obtained from the INSTANT (International Nusantara Stratification and Transport) recovery cruise, June 14-19th 2005. The quality of the detected-overturn regions has been improved by applying wavelet denoising to CTD signals. The Thorpe analysis shows that many overturn regions less than 7 m were detected in throughout the water column of the Lombok Strait. Based on linear relationship between Thorpe Scale and Ozmidov Scale, the turbulent kinetic energy dissipation rate ε was estimated about 10−12−10−6 W kg−1 and density of eddy diffusivity Kρ (10−6−10−2 m2s −1). A relatively high of Kρ Ø (10−2 m2s −1) was found at the southern part of the strait, near the sill which obstruct the Indonesian Thoughflow into the Indian Ocean. The dipped and rebounded isopycnal surfaces of σθ= 25.5–26.5 near the sill and the presence of strong shear at the same depth of the interval solitary wave (150 to 250 m) indicate that strong turbulence in this layer was driven by shear instability associated with breaking internal waves.

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“…It can be seen that, near the time of the submarine wreck, ISWs generally propagated toward the northwest, and thus, the ISWs were concentrated in the area north of Bali Island where the submarine wreck occurred. However, in the SAR images collected by Karang et [14,29], most of ISWs propagated northeastward after being emitted from the LS, and those waves were mainly distributed in the area to the north of the Lombok Island rather than the Bali Island. This phenomenon indicates that the spatial distribution of ISWs in the BS has significant temporal variability, which may be modulated by dynamic processes such as mesoscale eddies.…”

Section: Spatial Distribution Of Iswsmentioning

confidence: 99%

Internal Solitary Wave Activities near the Indonesian Submarine Wreck Site Inferred from Satellite Images

Huang

Zhao

Zheng

et al. 2022

JMSE

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In the early morning of 21 April 2021 local time, the Indonesian Navy submarine KRI nanggala-402 crashed in the Bali Sea (BS). As internal solitary waves (ISWs) are a great threat to submarine navigation, this paper analyzes the characteristics of ISWs in the BS by surveying satellite remote sensing images collected from 12–21 April 2021. The satellite images revealed active ISWs in the BS near the submarine wreck site with crest lengths approaching 200 km. Originating from the Lombok Strait (LS), the waves travelled northwestward across the BS deep basin, passed through the submarine wreck site, and shoaled onto the continental shelf west of the Kangean Islands, during which process, the propagation speed reached 2.69 m/s in the deep basin and 0.71 m/s in the shallow water. Based on the satellite images, the wave amplitude near the wreck site was reconstructed to be 41 m, and the reconstructed underwater wave structure showed a maximum vertical velocity of 10 cm/s. Satellite images also demonstrated the near-source evidence of ISWs near the Nusa Penida sill of the LS, and their generation were estimated to be related to the southward tidal current troughs.

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Landsat 8 Observation of the Internal Solitary Waves in the Lombok Strait

Cited by 11 publications

References 21 publications

Internal solitary waves propagation speed estimation in the northern-part of Lombok Strait observed by Sentinel-1 SAR and Himawari-8 images

Internal solitary waves propagation speed estimation in the northern-part of Lombok Strait observed by Sentinel-1 SAR and Himawari-8 images

Turbulent mixing process in the Lombok Strait

Internal Solitary Wave Activities near the Indonesian Submarine Wreck Site Inferred from Satellite Images

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