scholarly journals Modeling The Hydrodynamic Characteristics of Tidal And Monsoonal Currents In Pondok Dayung Port of Tanjung Priok Harbor, Jakarta

2021 ◽  
Vol 925 (1) ◽  
pp. 012059
Author(s):  
Yayan S Maryan ◽  
Widodo S Pranowo ◽  
Dian Adrianto ◽  
Agung Kurniawan ◽  
Nawanto B. Sukoco ◽  
...  
Keyword(s):  
Shallow Water Equation ◽  
Research Area ◽  
Current Speed ◽  
Ocean Current ◽  
Hydrodynamic Characteristics ◽  
Flow Conditions ◽  
Current Characteristics ◽  
Coastal Bay ◽  
Protective Structures ◽  
Basin Area

Abstract The Pondok Dayung port forms a significant segment of the Tanjung Priok harbor in the Jakarta coastal bay. Studies on the hydrodynamic characteristics of tidal and monsoonal currents appear very important to ship movement and laid/dock operations in port basins/jetties. These flow conditions have been simulated using a two-dimensional shallow water equation, while the tidal and monsoonal wind were coupled to model the ocean current. In general, the simulation results of the ocean current characteristics were dominated by tidal effects, as well as the interactions with the coastlines, jetties, and breakwaters. Also, the geometric replica has been validated satisfactorily, using time series sea elevation from the tidal station in the research area managed by the National Geospatial Agency (BIG). Strong RMSE and linear correlation values ranging from 0.0405-0.0458 m and 0.9648-0.9843 were obtained, respectively. During the flood tides, the ocean current is directed towards the basin area, while an outward flow is observed under ebb conditions. Furthermore, the maximum tidal current speed of ±0.26 m/s was recorded at the port waterways. A similar outcome was also reported during the west and east monsoon, in addition to a minimum ocean current speed of approximately 0.00 m/s. These conditions implied that the Pondok Dayung port and its breakwater system served as protective structures to the surrounding vessels and the harsh ocean current impacts.

ASSESSMENT OF POTENTIAL MARINE CURRENT ENERGY IN THE STRAITS OF THE LESSER SUNDA ISLANDS

2021 ◽  
Vol 36 (1) ◽  
Author(s):  
Ai Yuningsih Yuningsih
Keyword(s):  
Cross Sections ◽  
Tidal Flow ◽  
Ocean Current ◽  
Maximum Speed ◽  
Geological Processes ◽  
The Pacific ◽  
Marine Current ◽  
Current Characteristics ◽  
Stationary Location ◽  
Almost All

The Lesser Sunda Islands extend from Bali to Timor and consist of two geologically distinct parts formed by a subduction system of oceanic crust along the Java-Timor Trench. The northern part which includes Bali, Lombok, Sumbawa, Flores, Wetar, Pantar and Alor, is volcanic in origin; whilst the southern part is non-volcanic, encompassing the islands of Sumba, Timor and Rote. The straits along the Lesser Sunda Islands are formed as a result of very complex geological processes and tectonics in this area. These straits are the most important cross-sections in the southern part of the Indonesian Throughflow (ITF), functioning as outlets for the mass flows of seawater from the Pacific Ocean to the Indian Ocean through the Flores and the Savu Seas. In these straits, relatively high current speeds are occurred, not only caused by the ITF but also due to its geometry, the influence of tidal flow, and monsoonal currents.Site study and ocean current measurement were conducted by using an echosounder, a pair of Acoustic Doppler Current Profilers (ADCP), and other supporting equipment. In general, the average of most ocean current speeds is less than 1.5 m/s with a duration flow of 8 -12 hours a day, and the maximum speed reaches up to 3 m/s. The tidal types in almost all the straits are mixed semidiurnal tides, in which two high waters and two low waters occur twice a day, with the high and low tides differ in height.The Lesser Sunda Straits were selected as the potential sites for ocean current power plant because their current speeds are relatively high and their characteristics are more predictable compared with other straits from other regions. Based on the results of bathymetry survey and current characteristics from the deployed ADCP at a fixed (stationary) location on the seabed, the best location for the current power turbines is at the depth of 15-30 m where the seabed gently sloping.

scholarly journals POTENSI ENERGI ARUS LAUT SEBAGAI ENERGI TERBARUKAN DI SELAT LOMBOK BERDASARKAN DATA INSTANT WEST MOORING DEPLOYMENT 1

2017 ◽  
Vol 14 (2) ◽  
Author(s):  
Yogo Pratomo ◽  
Widodo Setiyo Pranowo ◽  
Sahat Monang Simanjuntak
Keyword(s):  
Renewable Energy ◽  
Water Depth ◽  
Current Speed ◽  
Ocean Currents ◽  
Ocean Current ◽  
The Pacific ◽  
Through Flow ◽  
The Indian Ocean ◽  
The Pacific Ocean ◽  
Harmonic Components

Selat Lombok merupakan salah satu perlintasan massa air laut dunia, yang mengalir dari Samudera Pasifik menuju ke Samudera Hindia yang disebut sebagai Arus Lintas Indonesia (ARLINDO). Hal ini terbukti dengan adanya komponen harmonik periode panjang yang di pengaruhi oleh Matahari (SA, SSA), dan dipengaruhi Bulan (MSF). Hasil rekaman mooring selama 1,5 tahun, selat ini memiliki kecepatan arus harmonik rata-rata sebesar 0,25219 m/dt di kedalaman 100 meter. Arus laut merupakan salah satu energi baru terbarukan yang dapat di manfaatkan sebagai pembangkit listrik. Arus laut diolah dengan menggunakan modul toolbox T-Tide 1,3 beta, dan menghasilkan arus harmonik dan arus non harmonik. Berdasarkan komputasi skenario pertama, dengan menggunakan turbin Helix LC 500 dan menghasilkan listrik 3,56 KW (harmonic), dan 1,86 KW (non harmonik) dengan kecepatan arus terbesar terjadi pada kedalaman 146,31 meter. Nilai kecepatan arus rata-rata terdapat pada kedalaman 178,31 meter dengan daya yang dihasilkan sebesar 92,17 W pada kondisi arus non harmonik. Kecepatan arus rata-rata pada kondisi arus harmonik terdapat pada kedalaman 162,31 meter, dengan daya yang dihasilkan sebesar 32,943 W.Kata Kunci : arus laut, energi baru terbarukan, Selat Lombok, INSTANT West Mooring.Lombok Strait is one of seawater mass outlet, flowing from the Pacific Ocean toward the Indian Ocean called as Indonesian Through Flow (ITF). It is proven by long period of harmonic components influenced by sun (SA, SSA) and moon (MSF). The result of mooring record for 1.5 years, this strait has average speed of the harmonic ocean current is 0.25219 m/s at 100 meters water depth. Ocean current is one of renewable energy that can be used for generating power electric. Ocean currents processed by using T-tide matlab toolbox 1.3 beta to identified the harmonic and non harmonic currents. Based on first scenario of the computer conversion, by using a Helix turbine LC 500 and produce an electricity energy about 3.56 KW (harmonic), and 1.86 KW (non harmonic) ocean currents, with the maximum current speed at the 146.31 meters water depth. The average of current speed average found at 178.31 meters water depth, and it produces a power of 92.17 W (non harmonic). The current speed averages from the harmonic condition is found at 162.31 meters water depth, which can produce a power about 32.943 W.Keyword : ocean currents, potential renewable energy, Lombok Strait, INSTANT West Mooring.

scholarly journals Hydrodynamics of Bontang Seawaters: Its Effects on the Distribution of Water Quality Parameters

2016 ◽  
Vol 21 (3) ◽  
pp. 123
Author(s):  
Ulung Jantama Wisha ◽  
Semeidi Husrin ◽  
Gegar Sapta Prasetyo
Keyword(s):  
Water Quality ◽  
Coastal Zone Management ◽  
Secondary Data ◽  
Dissolve Oxygen Concentration ◽  
Quality Parameters ◽  
Current Speed ◽  
Primary Data ◽  
Hydrodynamic Characteristics ◽  
Hydrodynamic Simulation ◽  
Zone Management

Bontang is a crowded with residential and industrial activities which produce heat waste into surrounding waters. This condition may cause environmental problems, and changes in water condition. Knowledge about dynamics of physic and chemical waters condition in Bontang city is very important as an effort to address environmental issues as part of coastal zone management and protection. The aim of this research is to understand hydrodynamic characteristics (tide and current) and the influence to distribution of physics and chemical in Bontang waters base on primary data (current and tide during one month, physics and chemicals waters data taken by in situ) and secondary data (bathymetry and tide forecasting). Hydrodynamic simulation is based on MIKE 21 and supported by CD-Oceanography and WR plot. The results show that the current is dominant move toward the Southwest and Northeast with current speed ranged from 0-0,22 m.s-1. The results of hydrodynamic simulation in the surface water show that the current move base on tide movement with current speed ranged from 0-0,24 m.s-1. The results of physic and chemical concentration is analysed by ArcGIS 10 to know spatial distribution of all parameters. Surface temperature ranged from 29-31,8oC, surface density ranged from 20-20,6 ppm, salinity ranged from 33,1-33,5 ppm, dissolve oxygen concentration ranged from 0,078-0,11 ppm. Distribution of all physic and chemical parameters is influenced by current and tide movement. Keywords: current, numerical model, water quality, Bontang waters

Ocean Current Model Using SINS/GPS/DVL Integrated Navigation

2013 ◽  
Vol 316-317 ◽  
pp. 419-422 ◽  
Author(s):  
Yue Yang Ben ◽  
Xin Yuan Liu ◽  
Zhong Jun Zhu ◽  
Heng Du
Keyword(s):  
Kalman Filter ◽  
Current Model ◽  
Current Speed ◽  
Ocean Current ◽  
Integrated Navigation ◽  
Relative Speed ◽  
The Core ◽  
Simulation Results ◽  
Navigation Accuracy ◽  
Navigation Method

The navigation system of the AUV usually takes SINS as the core, and is supplemented by GPS and DVL. While the output speed of the DVL is relative to the water, and the relative speed is taken as the observed quantity to assist SINS, the navigation accuracy will be declined. In order to solve the problem, SINS/GPS/DVL integrated navigation method is proposed to estimate the ocean current model. In this method, the Kalman filter is used to estimate the ocean current based on the ocean current model, and then the speed relative to the seabed is gained and taken as the measurements for assisting the SINS. Simulation results show that the proposed method can estimate accurately the ocean current speed.

Does spawning depth affect fertilization rates? Experimental data from the sea star Coscinasterias muricata

2000 ◽  
Vol 51 (1) ◽  
pp. 55 ◽  
Author(s):  
Russ Babcock ◽  
Elke Franke ◽  
Neill Barr
Keyword(s):  
Shallow Water ◽  
Marine Invertebrates ◽  
Lateral Diffusion ◽  
Fertilization Rate ◽  
Fertilization Success ◽  
Current Speed ◽  
Sea Star ◽  
Flow Conditions ◽  
Fertilization Rates ◽  
Diffusion Parameters

Measurements of fertilization rates in free-spawning marine invertebrates have shown that reproductive success is related to both behavioural and environmental factors. Water depth has been suggested as being one such factor affecting fertilization success. In experimental spawnings of the sea star Coscinasterias muricata, fertilization rates decreased exponentially with distance from sperm source but were frequently greater than 20% at distances >10 m downstream. Current speed did not have a significant effect on fertilization rate over the range of velocities examined. Fertilization rates directly downstream from spawning individuals were higher in shallow water (<1 m) than in deep water (>5 m). Diffusion models using empirically derived site-dependent diffusion parameters supported these findings but suggested that this would only be true for eggs released directly downstream from a sperm source. Once lateral diffusion of sperm was accounted for, the model predicted little overall difference in fertilization rates for shallow and deep spawners. These results from Coscinasterias indicate that movements into shallow water at the time of spawning, which have been reported in several asteroid species, may provide little reproductive advantage in environments experiencing net flow conditions.

Experimental Investigation of Fluid-Structure Interaction in Linked Flexible Net Cages

2021 ◽  
Author(s):  
Shuchuang Dong ◽  
Jinxin Zhou ◽  
Qiao Li ◽  
Takero Yoshida ◽  
Daisuke Kitazawa
Keyword(s):  
Drag Force ◽  
Measurement Range ◽  
Current Speed ◽  
Hydrodynamic Characteristics ◽  
Cross Sectional ◽  
Fluid Structure ◽  
Speed Reduction ◽  
Drag Forces ◽  
Net Cage ◽  
Net Cages

Abstract In the present study, three flexible net cage groups (a single net cage, two net cages arrayed in one column, and three net cages arrayed in one column) were investigated in a flume tank, in order to analyze the hydrodynamic characteristics of the flow and linked flexible net cage, such as the drag force, cage deformation, and flow field inside and around. Based on these results, the fluid-structure interactions of the flexible net cage were discussed. The drag forces and cage deformation of a single flexible net cage were first studied, and their relationships to the current speed were found consistent with existing literature. The averaged current speed inside the single net cage was 0.72 for all incoming current speeds. Furthermore, significant current speed reductions occurred behind the single net cage, at the downstream, for all incoming current speeds. Within the measurement range, the current speed reduction area downstream from the single net cage was almost as wide as the cage diameter, and the length was up to 1.4 times cage diameters along the incoming current direction. The location of this area gradually approached the water surface as the current speed increased. In the case of two flexible net cages arrayed in one column, the differences in drag force occurred when the distance between the two cages was changed. In addition, the current speed incident on the downstream cage tended to decrease, as the distance between the cages increased. The averaged current speeds incident on the downstream cage were 0.54, 0.44, 0.77, and 0.40 when the distances between two cages were 30.0 cm, 60.0 cm, and 90.0 cm, respectively. In the case of three flexible net cages arrayed in one column, the total drag force of three flexible net cages was 2.2 times that of a single net cage. On the other hand, at the maximum current speed of 50 cm/s, the cross-sectional areas of the first net cage, the second net cage, and the third net cage were 177.10 cm2, 274.19 cm2, and 277.37 cm2, respectively. Overall, the findings of this study could not only help to understand and optimize flexible net cage structures but also provide useful information for the configuration of the net cages at the farm sites.

scholarly journals Fractal Analysis of Deep Ocean Current Speed Time Series

2017 ◽  
Vol 34 (4) ◽  
pp. 817-827 ◽  
Author(s):  
Laura Cabrera-Brito ◽  
German Rodriguez ◽  
Luis García-Weil ◽  
Mercedes Pacheco ◽  
Esther Perez ◽  
...  
Keyword(s):  
Time Series ◽  
Long Range ◽  
Detrended Fluctuation Analysis ◽  
Single Point ◽  
Deep Ocean ◽  
Current Speed ◽  
Ocean Current ◽  
Fluctuation Analysis ◽  
Long Range Correlations ◽  
Detrended Fluctuation

AbstractFractal properties of deep ocean current speed time series, measured at a single-point mooring on the Madeira Abyssal Plain at 1000- and 3000-m depth, are explored over the range between one week and 5 years, by using the detrended fluctuation analysis and multifractal detrended fluctuation analysis methodologies. The detrended fluctuation analysis reveals the existence of two subranges with different scaling behaviors. Long-range temporal correlations following a power law are found in the time-scale range between approximately 50 days and 5 years, while a Brownian motion–type behavior is observed for shorter time scales. The multifractal analysis approach underlines a multifractal structure whose intensity decreases with depth. The analysis of the shuffled and surrogate versions of the original time series shows that multifractality is mainly due to long-range correlations, although there is a weak nonlinear contribution at 1000-m depth, which is confirmed by the detrended fluctuation analysis of volatility time series.

Hydrodynamic Characteristics of Crossflow over MEMS-Based Pillars

2011 ◽  
Vol 133 (8) ◽  
Author(s):  
Ali Koşar ◽  
Brandon Schneider ◽  
Yoav Peles
Keyword(s):  
Friction Factor ◽  
Hydrodynamic Characteristics ◽  
Flow Conditions ◽  
Pin Fin ◽  
Aspect Ratios ◽  
Friction Factors ◽  
Wide Range ◽  
Hydrodynamic Processes ◽  
Factor Data ◽  
Key Parameter

A parametric study was performed to reveal the hydrodynamic processes controlling crossflow over MEMS-based micro pin fin devices. Pressure drop experiments were conducted and used to obtain friction factors on a wide range of micro pin fin devices for various flow conditions and geometrical configurations, including pin fin height-to-diameter aspect ratios, spacings, and shapes. The acquired data suggests that the device geometry is the key parameter dictating friction factor trends and magnitude along with the Reynolds number. Additionally, friction factor data has shown that correlations based on experimental results performed on conventional scale tube bundles do not accurately predict the trends under working conditions pertaining to microfluidic systems.

Current, temperature, and depth data from a moored oceanographic buoy

1968 ◽  
Vol 5 (5) ◽  
pp. 1261-1268
Author(s):  
D. A. Grant
Keyword(s):  
Nova Scotia ◽  
Tidal Effect ◽  
Current Speed ◽  
Ocean Current ◽  
Sea State ◽  
Depth Data ◽  
Recording Unit

This report presents the data obtained by an oceanographic buoy moored 300 nautical miles southeast of Halifax, Nova Scotia, in a depth of 4316 m for a period of 38 days in August–September, 1966. Data pertaining to ocean current, temperature, and depth of recording units were collected and are analyzed in this report. The oceanographic buoy was launched and recovered without difficulty, and during the mooring period it withstood sea states up to and including sea state 7. Analysis of the data indicated that current speed and depth variations of the recording unit correlated with the semi-diurnal tidal effect.

scholarly journals Effect of Macrophytes on Flow Conditions and Deposition of Suspended Particles in Small Streams: an Experimental Study Using Artificial Vegetation

2015 ◽  
Vol 28 (3) ◽  
pp. 231-245 ◽  
Author(s):  
Delphine C. Rolland ◽  
Jacques Haury ◽  
Pierre Marmonier ◽  
Yvan Lagadeuc
Keyword(s):  
Aquatic Macrophytes ◽  
Field Experiments ◽  
Fine Particles ◽  
Organic Matter Content ◽  
Sediment Traps ◽  
Suspended Particles ◽  
Hydrodynamic Characteristics ◽  
Flow Conditions ◽  
Entire Volume ◽  
Small Streams

AbstractAquatic macrophytes are often the dominant element that influences flow conditions within streams, and are often considered as ecosystem engineers that modify their aquatic environment as a result of their physical structure and metabolic activity. The role of aquatic macrophytes on suspended matter sedimentation was studied in three shallow low-order streams in Brittany (North-western France). Field experiments were carried out in April 2007 using Callitriche-like artificial macrophytes and cylindrical sediment traps dug into the channels. Hydrodynamic characteristics (velocity profile, percentage of velocity decrease and turbulence), volume of trapped sediment, particle size characteristics, and total organic matter content were measured within the macrophytes and compared with the control traps. The aquatic macrophytes operated as sediment traps by modifying the local hydrodynamic parameters. Sedimentation of fine suspended particles within the macrophytes reached maximum values when the velocity was significantly reduced, i.e. when the initial velocity was low (less than 0.5 m∙s‑1) and the depth shallow enough for the plant to occupy the entire volume of the column water. Conversely, turbulence was generated around the macrophyte stands, which induced the resuspension of fine particles and only coarse particles were trapped. This study shows the importance of threshold values at the local scale and the highly dynamic effect of macrophytes on flow characteristics.

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