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INDONESIA
Jurnal Segara
Published by Kementerian Kelautan dan Perikanan RI
ISSN : 19070659     EISSN : 24611166     DOI : -
Core Subject : Science, Social,
Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology
Jurnal SEGARA (p-ISSN: 1907-0659, e-ISSN: 2461-1166) adalah Jurnal yang diasuh oleh Pusat Riset Kelautan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan (BRSDMKP), Kementerian Kelautan dan Perikanan – KKP, dengan nomenklatur baru Pusat Riset Kelautan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan, KKP dengan tujuan menyebarluaskan informasi tentang perkembangan ilmiah bidang kelautan di Indonesia, seperti: oseanografi, akustik dan instrumentasi, inderaja,kewilayahan sumberdaya nonhayati, energi, arkeologi bawah air dan lingkungan.
Arjuna Subject : -
Articles 191 Documents
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Acoustic Wave Propagation Patterns in the Ocean Column Fachri Ali Badihi; Sri Pujiyati; Ayi Rahmat; Steven Solikin; Muhammad Hisyam
Jurnal Segara Vol 18, No 3 (2022): December
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i3.11453

Abstract

Temperature and salinity play a role in the speed of sound and the process of sound propagation of acoustic waves in the water. Research on the propagation of sound waves in the ocean is a very interesting topic to do because it has many applications, including in underwater wireless communication systems and maritime security. This study aimed to analyze the propagation of acoustic waves in different water depths. The modeling was carried out with flat wave characteristics, in which the bathymetry characteristics of the seawater were ignored. In this ray path simulation, the frequency of 5.3Hz was used at 3 stations with different seawater depths in the Makassar Strait using temperature and salinity data downloaded from marine.coperniccus.eu data. The movement pattern of the acoustic waves was simulated using the Bellhop method. The ray tracing simulation results showed significant differences at the three locations. This was influenced by several factors, including the condition of the seawater environment, the placement of the transducer, the speed of sound, and the depth. Shallow seawater would show a more complicated ray path than deep seawater. The greater the angle of the half beam used, the greater the distance of the range of each beam of light will be so that the reflection of the resulting beam of light covers each column of seawater. The closer the distance between the resulting ray paths, the smaller the energy lost.
Salinity Sensor Development for Pond Water Utilizing Ultrasonic Wave Dananjaya Endi Pratama; Agus Indra Gunawan; Rusminto Tjatur Widodo; Akhmad Hendriawan
Jurnal Segara Vol 18, No 2 (2022): August
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i2.10932

Abstract

Shrimp farming is one of the most popular aquaculture activities in Indonesia. This activity is carried out in a pond. Therefore, there are many ponds as a place for shrimp farming in Indonesia. Several factors affect the results of shrimp farming in ponds. One of the factors is water quality. Four parameters that are commonly used to indicate water quality i.e. dissolve oxygen, salinity, PH, and temperature. In this study, we discussed salinity measurement. Most salinity sensors use the probe principle in measurement. When the sensors are used to measure the water that contains mineral salts, the probe will be susceptible to rust and cause measurement errors. Based on these conditions, we conducted a study of salinity measurements by using the acoustic technique. The measurement was carried out by using an ultrasonic wave. The water salinity was determined based on the acoustic intensity and acoustic speed. In this research, we developed a conversion curve based on the measurement of acoustic intensity from NaCl, KCl, and MgCl2 saline solutions with certain concentrations. The conversion curve is used to measure salinity in pond water. We also calculated salinity based on the measurement result of acoustic speed. From the experiment, the NaCl conversion curve became the most suitable for salinity measurement. The measurement result of salinity in pond water from the NaCl saline solution conversion curve was very close to the results of Del Grosso formula, Chen Millero formula, and refractometer.
Opak and Bogowonto Coastal Inlet Sand Spit Morphodynamics using Landsat and Sentinel Satellite Images Rizal Fadlan Abida; Totok Suprijo; Budhy Soeksmantono
Jurnal Segara Vol 18, No 3 (2022): December
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i3.11918

Abstract

Sand spits are elongated sand deposits on the beach that often form at the inlet or the headland’s tip. The hydrodynamics of the river flow, waves, storm surge, and tide affect the sand spit formation, which was created by the longshore transport along the coast. Bogowonto and Opak inlets are located in southern coastal Java facing directly to the Indian ocean where micro-tidal, waves, and river flow affecting both inlets, are chosen for this case study. Morphodynamics analysis of sand spit using Landsat 7 and 8, Sentinel 2 image from 2000 to 2020, coastline identification using Modified Normalized Different Water Index (mNDWI). In November 2007 and October 2013, Opak Inlet migratory routes were detected, and closures related to the east season occurred at both of them. Inlet tend to close occur on east season during July until November.
Abundance and Diversity of Phytoplankton and Zooplankton in Waters of Youtefa Bay Tourism Area Annita Sari; Ambo Tuwo; Chair Rani; Amran Saru; Yudi Prayitno
Jurnal Segara Vol 18, No 3 (2022): December
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i3.11875

Abstract

The waters in Youtefa Bay have degradation due to the transition from mangrove areas to industrial sites, housing, bridge construction and household waste disposal. Water degradation has indirectly affected the growth of plankton. Plankton consists of phytoplankton which is the primary producer of the food chain so that it is utilized by zooplankton as the first consumer. The aim of this study was to determine the abundance and diversity of phytoplankton and zooplankton. This research was conducted during June-August 2019, the method used purposive sampling. Samples were obtained from 6 observation stations. The results showed there is 28 species of phytoplankton (∑160,000 ind/L) and 15 species of Zooplankton (∑ 84,200 ind/L). The diversity index of Phytoplankton is ranging from 1-2.21; Dominance (D) 0.17-0.4 and similarity (E) 0.59-1, while for zooplankton diversity (H’) ranges from 0.97-1.39; Domination (D) 0.07-0.42 and similarity (E) 0.59-1. The Diversity Index shows that the waters of Youtefa Bay have moderate diversity. The similarity between genera is relatively same. The Dominance index value during the observation was seen <0.5 or close to 0, this means that in the community that there was no genus that was extremely dominating the other genera.
Halaman Depan Jurnal Segara Vol 18 No 3 Joko Subandriyo, ST
Jurnal Segara Vol 18, No 3 (2022): December
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i3.12174

Abstract

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Halaman Belakang Jurnal Segara Vol 18 No 3 Joko Subandriyo, ST
Jurnal Segara Vol 18, No 3 (2022): December
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v18i3.12175

Abstract

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Evaluation of the Conformity of Marine Spatial Utilisation Activities (KKPRL) for Ports Sector in Palu Bay Indonesia Ahmadi, Nurdin; Suharyanto, Suharyanto; Prasetiyo, Didit Eko; Rahmawati, Yeni; Ndricenning, I Mario; Sidqi, Muhandis; Jakasukmana, Munandar; Syahruddin, A; Bakri, Reza Fauzi; Hafid, Wahyu; Salasah, Rosmawati; Nasution, Syahrial
Jurnal Segara Vol 19, No 1 (2024): April
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v19i1.14336

Abstract

The utilization of marine space requires regulation due to the multidimensional and overlapping interests in maritime areas. The increasing demand for marine space for various commercial and non-commercial purposes necessitates sustainable management strategies and legal governance to reduce cumulative impacts on the marine environment. The compliance level of marine spatial utilization activities (MSUA), particularly in port activities, is determined by three aspects: the extent realization aspect, the type of activities aspect, and the legal subject aspect. Progress in licensing and meeting MSUA obligations is evaluated using a matrix of suitability indicators with weighting and assessment for each indicator. The research findings indicate that, concerning the extent realization aspect used in the studied ports, compliance with the given MSUA is still observed. However, for the type of activities aspect and the legal subject aspect, progress in licensing and meeting MSUA obligations has not been fully adhered to. Thus, overall compliance is at a level of adherence with notes. Furthermore, at the business compliance level, operations are not conducted properly, as changes in status from non-commercial to commercial activities are not reported, potentially resulting in the loss of non-tax national revenue (PNBP). Regarding MSUA obligations, the indicators posing obstacles to compliance at ports are those related to the obligation of submitting written reports annually to the Minister of Maritime Affairs and Fisheries and reporting the establishment and/or placement of buildings and installations at sea to the agency responsible for hydrographic and oceanographic government affairs.
THE DETERMINATION OF THE DEPTH OF TPI PALANG’S HARBOUR BASIN TUBAN THROUGH CALCULATION OF TIDE COMPONENT Joesidawati, Marita Ika
Jurnal Segara Vol 19, No 1 (2024): April
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v19i1.10396

Abstract

Determination of the datum chart using the tide component can be used to determine the depth of the harbour basin. TPI Palang's harbour basin is often used as a place for mooring fishing boats, but it often happens that the ships get stuck before entering the haarbour basin. The type of fishing ship at the TPI Palang harbour basin is a payang boat with a draft depth of 2 m. The depth of the harbour basin measurement results in July 2017 was 8 m, while based on the bathymetric map is 12 m. Palang waters, in Tuban Regency is located in the North Sea of East Java, which is open water type, therefore the determination of the depth of the harbour basin is based on the state of the water, is 1.2 x ship draft, which is 2.4 m. The least square and the admiralty method were used to compare the best method in calculating the tidal component. Researchers used tidal data for August 2016- July 2017 obtained from BIG. The tidal type of the Palang waters is diurnal, with an F value for admiralty treatment of 5,160 with least square processing of 5,167. The correlation coefficient of the tidal component with admiralty processing occurs in K1-MS4 of 0.792, while the least square occurs in K1-M4 of 1.6. The result of the calculation of the tidal component of the least square is used to determine the value of the datum chart. The IHO (International Hydrographic Organization) datum chart is used as a basic reference for calculating the depth of the TPI Palang harbour basin. The results show that the required depth of Palang waters in the existing condition (8 m) still requires dredging between 0.033 - 1.071 m. However, to meet the standard of the harbour basin, the required depth is 13,071 m (from LWS) to 13,557 m (from LLWS) which means that the dredging of the harbour basin is about ± 4 m.
CATCH PERFORMANCE OF PURSE SEINE CASE STUDY ON KMN DIVA BAHARI AT KENDARI FISHING PORT Khikmawati, Liya Tri; Setyawan Sayuti, Noar Mudda; Rizal, Ahsanul; Hutapea, Roma Yuli F
Jurnal Segara Vol 19, No 1 (2024): April
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v19i1.14244

Abstract

Purse seines are a type of fishing gear that operates by surrounding schools of fish. The target fish caught from purse seines themselves are small pelagic fish that are in schools. One of the areas where the majority of fishermen use purse seines is PPS Kendari, where the target fish caught are scallops, skipjack tuna and tuna. The price of self-caught fish is influenced by the type, size and quality of the fish itself. One of the reasons for the feasibility of a fishing business can be assessed from the opinions obtained from the business carried out. Having data related to the performance of catches from a fishing business will provide an initial picture regarding the feasibility of the fishing business. Data collection was carried out by participating in KMN Diva Bahari fishing activities made 8 fishing trips (1 trip 5-8 days). Then fish samples are taken for each fishing operation and the type, number and size are seen/measured. The data that has been collected is then presented in tables and figures and then compared with literature studies regarding the size of fish worth catching. Based on data obtained in the field, it was found that the fish caught were gliding (the majority), tuna, mackerel, sunglir, baby yellowfin tuna and skipjack. Where all the tuna, skipjack, sunglir, tuna fish that were caught were not yet worth catching. Meanwhile, for mackerel, blue kites are included in the fish size category worth catching. Several things that influence the size of fish caught that are not suitable are catching in FAD areas where one of the functions of FADs is a place for spawning and rearing, fishing seasons and fish areas.
ANALYSIS OF CLIMATE COMFORT LEVEL IN JAM GADANG TOURISM AREA Purnama, Fahmi yuwan; M, Nurul Hasanah; Miokta, Thedy Gio; Raymon, M. Fatahilah; Virgianto, Rista Hernandi
Jurnal Segara Vol 19, No 1 (2024): April
Publisher : Politeknik Kelautan dan Perikanan Dumai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/segara.v19i1.12173

Abstract

The potential of the tourism sector is very important, especially in terms of economic development. One of the factors affecting the tourism sector is the comfort of climatic conditions. Information about climatic conditions becomes the main factor in choosing the destination of a tourist trip. This study aims to analyze the level of climate comfort in the Jam Gadang tourist area of West Sumatra Province based on the Temperature Humidity Index (THI), Discomfort Index (DI), and Humidex Index. The use of secondary data from the parameters of air temperature and daily air humidity obtained from the Bukit Kototabang Global Atmospheric Monitoring Station with a period range of 2010-2020. Processing using R-Studio and Microsoft Excel software. The method used is descriptive analysis. The results showed that the level of climate comfort in the jam gadang tourist area based on the THI, DI, and Humidex indices was included in the comfort category. May is the month with the highest level of comfort. then November is the month with the lowest level of comfort. All three indices have positive correlation values. The influence of the IOD phenomenon when neutral conditions, DM+, and DM- as a whole shows that the index value categories THI, DI, humidex belong to the comfort category. However, humidex index values when DM+ and DM- conditions fall into the category are a little uncomfortable. The average value of the THI index when it is neutral is 20.8 ºC, while at the time of DMI+ and DMI- the average index is the same at 21.7 ºC. Then, the average index value of DI when neutral conditions is 20.9 ºC, while when conditions are DMI+ and DMI- the average is 21.7 ºC. Then, the average value of the humidex index when the neutral condition is 28.1 ºC. While at the time of DMI+ and DMI- the average index is the same at 29.5 ºC.

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