Measurement and Analysis of Ocean Current using High- Frequency (HF) Radar Observation in the Bali Strait

Firdaus, R; Siadari, Ejha Larasati; Alfahmi, Furqon

doi:10.1088/1755-1315/893/1/012053

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…Panjang gelombang yang dipancarkan oleh HF Radar ialah sebesar 0-10 m dengan frekuensi 3-30 MHz (Barrick & Snider, 1977). Perbandingan rata -rata selama tiga jam dari kecepatan meridional antara data arus HF Radar dan ADCP di Selat Bali selama 10 hari menunjukkan nilai korelasi tinggi sebesar 0.813 dan RMSE 0.22 m/s (Firdaus et al, 2021). Perbandingan analisis statistik antara kecepatan arus laut permukaan dari HF Radar dan ADCP dengan lowpass filter 36 jam, didapatkan nilai RMSE dan IA 6,4 cm/s dan 0,99.…”

Section: Materi Dan Metodeunclassified

“…Karakteristik arus permukaan laut di perairan sekitar Bali telah dikaji oleh Theoyana et al (2015) dan Tanto et al (2017) di perairan Selat Badung dan Teluk Benoa dengan menggunakan data arus pengukuran ADCP. Di wilayah Selat Bali, penelitian arus permukaan dengan data HF Radar dilakukan oleh Setiawan (2020) pada musim barat yaitu Desember -Februari dan oleh Firdaus et al, (2021) yang hanya dilakukan pada bulan Juli tahun 2020. Supriyadi et al (2021) menyatakan bahwa pada bulan Juni, Juli, Agustus (musim timur) di Selat Bali memiliki kecepatan arus yang lebih tinggi dari bulan -bulan lainnya.…”

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Karakteristik Arus Laut Permukaan dari High Frequency Radar pada Musim Timur di Selat Bali

2022

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Bali Strait has many activities in port and water, such as passenger and freight transportation, tourism, and fisheries. Oceanographic conditions, especially sea surface current (SSC), affect the smoothness of ports and shipping activities in the Bali Strait. High-Frequency Radar (HF Radar) has the advantage of monitoring and mapping surface currents and ocean waves with high resolution. Because of the narrow strait area, HF Radar is very beneficial in describing the characteristics of SSC in the Bali Strait. Therefore, HF Radar data is used to describe the dynamics of SSC in the Bali strait, especially in ship crossing lane, with a temporal approach during Southeast Monsoon, June to August 2020. This study was conducted for 15 days each month which included neap tide and spring tide. Surface current charts are created to analyze the pattern of temporal SSC against the wind, tides, and their components. The results showed In the southeast monsoon, the average current speed at the research site ranged from 0.1 – 1.08 m/s. The direction of the surface current is predominantly towards the south. The characteristics of surface currents in the Bali Strait are influenced by tides, sea level anomalies, and coastal morphology. Temporally, the speed of the current is greater during the ebb phase and when the spring tide. Spatially, the central region of the Bali Strait waters has a greater current speed. Knowledge of areas and times with higher current speeds can be the basis for determining the shipping lane between ports in the Bali Strait. Selat Bali memiliki banyak kegiatan di pelabuhan dan perairan, seperti transportasi penumpang dan barang, pariwisata, serta perikanan. Kondisi oseanografi, khususnya arus permukaan laut, mempengaruhi kelancaran pelabuhan dan aktivitas pelayaran di Selat Bali. High-Frequency Radar (HF Radar) memiliki keunggulan pemantauan dan pemetaan arus permukaan dan gelombang laut dengan resolusi tinggi. Karena wilayah selat yang sempit, HF Radar sangat bermanfaat dalam menggambarkan karakteristik arus permukaan laut di Selat Bali. Oleh karena itu, data HF Radar digunakan untuk menggambarkan dinamika arus permukaan laut di jalur penyeberangan Selat Bali dengan pendekatan temporal pada musim timur, bulan Juni hingga Agustus 2020. Penelitian ini dilakukan selama 15 hari tiap bulan yang mencakup waktu pasang purnama dan pasang perbani. Grafik arus permukaan dibuat untuk menganalisis pola arus permukaan laut secara temporal ketika musim timur terhadap angin, pasang surut dan komponennya. Hasil menunjukkan pada musim timur, rata – rata kecepatan arus di lokasi penelitian berkisar antara 0.1 – 1.08 m/s. Arah arus permukaan dominan ke arah selatan. Karakteristik arus permukaan di Selat Bali di pengaruhi oleh pasang surut, sea level anomaly dan morfologi pantai. Secara temporal, kecepatan arus lebih besar ketika menuju surut dan ketika pasang purnama. Secara spasial, wilayah tengah perairan Selat Bali memiliki kecepatan arus yang lebih besar. Pengetahuan mengenai wilayah perairan dan waktu – waktu dengan kecepatan arus yang tinggi dapat menjadi dasar dalam penentuan alur pelayaran antar pelabuhan di Selat Bali.

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Karakteristik Arus Laut Permukaan dari High Frequency Radar pada Musim Timur di Selat Bali

2022

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“…In the case of the Bali Strait, the tidal velocity can reach a maximum of 2.97 m.s −1 and 2.17 m.s −1 during ebb and flood, respectively. Data from two HFRs operating at 26.275 MHz were tested against ADCP (Acoustic Doppler Current Profiler) data from Firdaus et al (2021). Good agreement was found between the two datasets with a correlation coefficient of 0.813 and an RMSE of 0.22 m.s −1 for the meridional velocity.…”

Section: Introductionmentioning

confidence: 98%

Multistatic estimation of high-frequency radar surface currents in the region of Toulon

et al. 2020

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The Alderney Race has been identified as a future site for the development of tidal energy, due to its bidirectional strong current reaching 5 m/s during spring tides. This hydrodynamics is very difficult to measure by in situ or remote sensing means. High-frequency coastal radars can provide a synoptic and near-real-time view of such a complex circulation, but the classical processing algorithms are not adapted to the extreme situation of strongly sheared currents. We propose an improved high-resolution direction-finding technique for the azimuthal processing of such radar data. It uses phased-array systems and combines the advantages of the usual beam-forming technique to eliminate many problems related to the distortion of Doppler spectra by extreme currents. The method is evaluated with a unique data set of radar measurements at two radar frequencies (13 and 24.5 MHz) and three spatial resolutions (200, 750, and 1500 m). The radar-based surface currents are analyzed in the light of a high-resolution numerical model and also compared with in situ measurements. While high azimuthal resolution can be achieved in this way, it is shown that the typical range resolutions of 750 and 1500 m are insufficient to account for the strong spatial variations of the surface current at some specific times and locations.

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Tidal-induced and wind-driven ocean surface current data analysis derived from HF radar in Bali Strait

Aldini,

Permanasari,

Hidayat

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The ocean surface currents (OSC) are subject to the influences of surface wind, tidal conditions, and various other factors. Understanding these forces is essential for efficient coastal management, port activities, environmental surveillance, and the precise forecasting of ocean currents in the region. This study examined ocean surface current (OSC) data in the Bali Strait from December 2020 to November 2021. The analysis used HF radar data and the DCCA (De-trended Cross-Correlation) method. The DCCA approach examined the correlation between OSC with tidal and wind data. The study demonstrated the capabilities of HF radar data and the DCCA technique in providing valuable insights into OSC behaviours associated with tidal and wind impacts. The peak correlation value was observed when the OSC value reached its highest point in July 2021. The study showed that, overall, the correlation of OSC with tide data surpassed its correlation with wind data, emphasizing the significant influence of both tidal and wind forces on the ocean surface current in the Bali Strait. Tidal forces exhibited a stronger correlation with OSC, highlighting their crucial roles in shaping ocean surface currents in the region. These discoveries are essential for enhancing our comprehension of ocean surface currents in several sectors, especially for their application in environmental monitoring and forecasting ocean currents to maintain environmental safety and efficient coastal management practices.

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Measurement and Analysis of Ocean Current using High- Frequency (HF) Radar Observation in the Bali Strait

Cited by 3 publications

References 14 publications

Karakteristik Arus Laut Permukaan dari High Frequency Radar pada Musim Timur di Selat Bali

Karakteristik Arus Laut Permukaan dari High Frequency Radar pada Musim Timur di Selat Bali

Multistatic estimation of high-frequency radar surface currents in the region of Toulon

Tidal-induced and wind-driven ocean surface current data analysis derived from HF radar in Bali Strait

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