Variasi Temporal Karakteristik Arus di Perairan Tanjung Jati Kabupaten Jepara

The waters of Tanjung Jati, Jepara Regency, are quite strategic areas due to the utilization of the coastal areas and waters. One water parameter that is important to study and has a high enough influence on other parameters is ocean currents. The purpose of this study is to determine the characteristics of the ocean currents that occur in the waters of Tanjung Jati, by temporal variation in 2020 and 2021. The results show that the smallest current velocity is in the most basic layer; this is likely due to the influence of the friction force on the bottom of the water, while the greatest velocity is on the layer near the surface. Current characteristics show a relationship between current velocity, current direction, and water level that occurs in each layer of water. This relationship can be seen by the decrease in current velocity at the lowest tide and the highest tide, and vice versa. The current velocity increases at low tide. The highest optimal velocity at low tide towards tide compared to tidal currents towards ebb. The direction of this optimal current is northeast. The movement of the current at tide towards the ebb is towards the West - Southwest, while the current movement during the tide towards the tide is towards the East - Northeast direction. The direction of the dominant current that occurs in the waters of Tanjung Jati B, Jepara, is towards the East-Northeast domination at low tide and towards the West-Southwest domination at low tide. Details on the current characteristics of each layer in 2020 and 2021 have not changed significantly. Kawasan perairan Tanjung Jati Kabupaten Jepara merupakan Kawasan yang cukup strategis dikarenakan pemanfaatan wilayah pesisir maupun perairannya. Terkait hal tersebut, sal;ah satu parameter perairan yang penting untuk diteliti dan mempunyai pengaruh cukup tinggi terhadap parameter lainnya adalah arus laut. Tujuan penelitian ini adalah mengetahui karakteristik arus laut yang terjadi di perairan Tanjung Jati, secara variasi temporal tahun 2020 dan 2021. Hasil penelitian menunjukkan Kecepatan arus terkecil berada pada layer paling dasar hal ini kemungkinan terjadi karena pengaruh gaya gesek dengan dasar perairan, sedangkan kecepatan paling besar berada pada layer dekat permukaan. Karakteristik arus seperti yang terlihat menunjukan adanya hubungan antara kecepatan arus, arah arus dengan elevasi air yang terjadi pada setiap lapis air. Hubungan ini dapat dilihat dengan adanya penurunan kecepatan arus pada saat muka air surut terendah dan pasang tertinggi dan sebaliknya kecepatan arus meningkat pada saat pasang menuju surut. Kecepatan optimal tertinggi pada saat arus surut menuju pasang dibandingkan dengan arus pasang menuju surut. Arah arus optimal ini adalah timur laut. Pergerakan arus pada saat pasang menuju surut adalah ke arah Barat – Barat Daya sedangkan pergerakan arus pada saat surut menuju pasang adalah ke arah Timur – Timur Laut. Arah arus dominan yang terjadi di kawasan Perairan Tanjung Jati B, Jepara adalah ke arah dominasi Timur- Timur Laut pada saat surut menuju pasang dan ke arah dominasi Barat-Barat Daya pada saat air pasang menuju surut. Detil pada karakteristik arus tiap layer pada tahun 2020 dengan 2021 tidak mengalami perubahan secara signifikan.

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KARAKTERISTIK ARUS LAUT PERAIRAN TELUK BENOA – BALI

GEOMATIKA ◽

10.24895/jig.2017.23-1.631 ◽

2017 ◽

Vol 23 (1) ◽

pp. 37 ◽

Cited By ~ 1

Author(s):

Try Al Tanto ◽

Ulung Jantama Wisha ◽

Gunardi Kusumah ◽

Widodo S. Pranowo ◽

Semeidi Husrin ◽

...

Keyword(s):

Current Velocity ◽

Tidal Current ◽

High Tide ◽

Flow Speed ◽

Ocean Currents ◽

Ocean Current ◽

Dominant Factor ◽

Irregular Pattern ◽

Current Characteristics ◽

June July

ABSTRAKPerairan Teluk Benoa merupakan kawasan semi tertutup dengan mulut sempit yang memisahkan antara Pulau Serangan dan Tanjung Benoa. Arus laut perairan Teluk Benoa, yang dekat pantai berperan penting dalam proses transpor sedimen di daerah pantai yang merupakan daerah gelombang mulai pecah hingga ke arah garis pantai. Tujuan penelitian adalah mengetahui karakteristik arus laut yang terjadi, analisis dari penyajian secara scatter plot dan stic plot, sehingga diketahui faktor dominan pembangkit arus tersebut. Data arus laut diperoleh dari hasil pengukuran pihak swasta menggunakan alat ukur ADCP. Analisis arus laut dengan scatter dan stic plot untuk melihat arah dominan arus, serta melihat hubungan kejadian arus dengan pasang surut air laut, selain itu juga dengan perhitungan kisaran kecepatan arus yang terjadi selama pengukuran. Hasil yang diperoleh adalah arus laut di perairan Teluk Benoa berkisar antara 0,001 - 1,715 m/s (pengamatan bulan Juni - Juli 2015). Kecepatan arus pada mulut teluk lebih besar (maksimal sebesar 1,715 m/s), sedangkan di dalam teluk kecepatan arus lebih rendah (maksimal sebesar 0,883 m/s). Pada saat air pasang, arah arus dominan ke arah dalam teluk dan saat air laut surut arah dominan arus ke arah luar teluk. Kesimpulan yang diperoleh adalah kejadian arus laut di perairan Teluk Benoa lebih dominan berupa arus pasang surut. Saat kondisi bulan purnama kecepatan arus lebih tinggi dari pada saat posisi bulan separuh (kuarter pertama atau ketiga). Pada umumnya, pada mulut teluk memiliki arus yang cukup tinggi sebagai akibat celah sempit, dengan pola yang tidak beraturan akibat pengaruh perlintasan kapal dan aktivitas keluar masuk teluk.Kata kunci: arus laut, karakteristik arus laut, arus pasang surut, Teluk BenoaABSTRACTBenoa Bay waters is a semi-enclosed area with quite a narrow mouth that separates the Serangan Island and Tanjung Benoa. Ocean currents in Benoa Bay, which is close to the beach plays an important role in the process of sediment transport in the beach area where is the waves began to break up towards the shoreline. The research objective was to know the characteristics of ocean currents that occur, from the analysis of the scatter and stic plot, so it’s known that the dominant factor of the current generator. The data of ocean currents obtained from the measurement of private parties using ADCP measuring instrument. Analysis of ocean currents with scatter and stic plot to see the dominant direction of current, and to see the relationship of current occurrence with the tide, besides also with calculation of current velocity. The results obtained are ocean currents in the Benoa Bay waters ranged from 0,001 to 1,715 m/s (observations in June-July 2015). Flow velocity at the mouth of the bay is greater (maximum of 1,715 m/s), while in the lower bay flow speed (maximum of 0,883 m/s). At high tide, the dominant current direction towards the bay and vice versa during low tide predominant direction of flow towards the outside of the bay. The conclusion is the incidence of ocean currents in the Benoa Bay waters is predominantly influenced by the tidal current. When the full moon conditions the current velocity is higher than at half month position. In general, at the mouth of the bay has a current high enough as a result of the narrow gap, with irregular pattern due to the influence and activities of ship crossings in and out of the bay.Keywords: ocean current, characteristics of ocean current, tidal current, Benoa Bay

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PEMODELAN DINAMIKA ARUS PERAIRAN INDONESIA YANG DISEBABKAN OLEH ANGIN

JURNAL PERIKANAN TROPIS ◽

10.35308/jpt.v3i1.31 ◽

2016 ◽

Vol 3 (1) ◽

Author(s):

Ika Kusumawati

Keyword(s):

South China Sea ◽

South China ◽

Current Velocity ◽

Monsoon Season ◽

Current Speed ◽

The South China Sea ◽

The South ◽

The West ◽

China Sea ◽

Current Movement

Research on current dynamics modelling in Indonesian waters with wind employed as independent variable has been observed. The purpose of this study was to model the hydrodynamic equations due to the influence of the wind in Indonesia waters in the form of visualization described consisting of wind circulation pattern and pattern of current movement in the west and east monsoon season. To analyze the data obtained during the study, researchers used a descriptive approach. The results showed that the west wind season (December, January, and February) blow from the northeast to the southwest then turning southeast. Whereas the east wind season (June, July, and August) blows from the southeast to the northwest and then turn to the northeast. On the surface layer shows the current movement in general follows the movement of the wind direction in which the current speed is very dominant occurred in some waters, such as the Karimata Strait, the Java Sea, the South China Sea, and the Arafuru Sea. The dominant current velocity in the layer of 100-200 m in the water of eastern equator and the South China Sea in the west season has recorded a current speed reaches 20 cm / s. while in the east monsoon which occurs in the equatorial waters of the eastern part, in the Maluku Sea, the Seram Sea and nearby the Arafuru Sea current velocity reaches 40cm / s.

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Numerical Model of Current Speed in Bojong Salawe Beach, Pangandaran West Java Province

International Journal of Global Operations Research ◽

10.47194/ijgor.v2i1.40 ◽

2021 ◽

Vol 2 (1) ◽

pp. 17-23

Author(s):

Subiyanto Subiyanto ◽

Nira na Nirwa ◽

Yuniarti Yuniarti ◽

Yudi Nurul Ihsan ◽

Eddy Afrianto

Keyword(s):

Numerical Models ◽

High Tide ◽

Movement Pattern ◽

Numerical Data ◽

Current Speed ◽

The West ◽

Instantaneous Speed ◽

The Difference ◽

West Monsoon ◽

Current Movement

The purpose of this study was to determine the hydrodynamic conditions at Bojong Salawe beach. The method used in this research is a quantitative method, where numerical data is collected to support the formation of numerical models such as wind, bathymetry, and tide data. The hydrodynamic model will be made using Mike 21 with the Flow Model FM module to determine the current movement pattern based on the data used. In the west monsoon with a maximum instantaneous speed of 0.04 - 0.08 m/s, while in the east monsoon it moves with a maximum instantaneous speed of 0,4 – 0,44 m/s. The dominant direction of current movement tends to the northeast. The results indicate the current speed during the east monsoon is higher than the west monsoon. The difference in the current speed is also influenced by the tide conditions; higher during high tide and lower during low tide. Monsoons also have a role in the current movements, though the effect is not very significant.

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Direct Measurements of Ocean Currents over the Continental Slope off Sydney

Marine and Freshwater Research ◽

10.1071/mf9790833 ◽

1979 ◽

Vol 30 (6) ◽

pp. 833 ◽

Cited By ~ 1

Author(s):

BV Hamon

Keyword(s):

Continental Slope ◽

Deep Ocean ◽

Surface Current ◽

Ocean Currents ◽

North East ◽

Direct Measurements ◽

Deep Ocean Currents ◽

Neutrally Buoyant ◽

Tracking Period

The results of measurements of deep ocean currents over the continental slope off Sydney in May 1979 are presented and discussed. The measurements were made using neutrally buoyant floats. Four floats were used, at mean depths of 766, 1251, 1519 and 1886 m. All four floats moved towards north-north-east, approximately parallel to the depth contours, with mean speeds, over the 34-day tracking period, in the range 5-9 cm s-1. The surface current, estimated from ship's set, was towards north-east, at 25 cm s-1.

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Parameter Prediction Method for Submarine Cuttings Piles in Offshore Drilling

SPE Journal ◽

10.2118/200486-pa ◽

2020 ◽

Vol 25 (03) ◽

pp. 1307-1332

Author(s):

Baojiang Sun ◽

Zhi Zhang ◽

Zhiyuan Wang ◽

Shaowei Pan ◽

Ze Wang ◽

...

Keyword(s):

Current Velocity ◽

Geometric Characteristic ◽

Stable State ◽

Prediction Method ◽

Continuous Model ◽

Ocean Currents ◽

Ocean Current ◽

Offshore Drilling ◽

Before And After ◽

Drilling Site

Summary The cost of offshore drilling operations can be significantly reduced by discharging drilling cuttings into the seabed. However, this leads to accumulation of cuttings piles on the seabed near the drilling site. A certain thickness of cuttings piles changes the original trend of the seabed terrain undulation condition, thus bringing potential safety hazards to the underwater installation of production manifolds. Moreover, the interaction between cuttings and ocean currents near the cuttings piles causes the geometric shape of cuttings piles to evolve over time, which makes it more difficult to accurately predict their characteristics. On the basis of the force analysis of cuttings, considering the effects of cuttings properties (cutting size, density) and ocean-current velocity on the geometric characteristic evolution of the formed cuttings piles, a continuous model for describing the evolution of the returned cuttings piles is established in this study. This model can quantitatively characterize the functional relationship between characteristics of cuttings piles and relevant parameters (current velocity, cutting size, evolution time), and predict the location and geometry characteristics of the cuttings piles evolving into a stable state in ocean currents. Comparing the measured data in laboratory experiments and at an offshore drilling field, the relative error of the model amounts to less than 10%, which demonstrates its rationality. Simulation results show that there will be significant changes in the geometry of cuttings piles before and after the evolution, in which the intensity is correlated with current velocity and cuttings size, and cuttings piles might even split into several parts under certain conditions. The simulation and analysis of the transport and deposition of cuttings returned from the wellhead on the seabed is highly significant for the guide and optimal design of underwater production manifolds.

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