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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 6 Documents
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Search results for , issue "Vol 16, No 2 (2020): Agustus" : 6 Documents clear
Saving Derawan Island from Abration for Marine Tourism Suistainable Dadang Ilham Kurniawan Mujiono; Nurfitriana Pereda Prahara; Kurnianto Rambe Rante; Bella Arisandy
Jurnal Segara Vol 16, No 2 (2020): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (44.993 KB) | DOI: 10.15578/segara.v16i1.7501

Abstract

As an archipelago state, Indonesia globally famous with mega marine biodiversity. This country contributes the most extensive area among six countries under the Coral Triangle area. The area contains almost 600 species of corals and, 76% of total corals worldwide found in the coral triangle. Moreover, 574 of coral species which 72% of total corals globally located in Indonesia, and Raja Ampat hosting the highest biodiversity followed by Derawan Island in East Kalimantan Province. Despite having extraordinary marine biodiversity, Derawan Island experience several environmental issues. One of them is Abrasion. Data collecting are through observation and in-depth interview. The research shows that Derawan Island experienced massive abrasion on the East side of the island due to  housing developments in the South area of the island. As the consequences, the water current which carried the sand from the East and the Westside was stuck in the South area of the island. Therefore, the solutions that can be conducted are: (1) building erosion prevention; (2) coral reef treatment; (3) relocation for people who live on the coastline.
Reef Geomorphology and Associated Habitats of Karimunjawa Islands, Indonesia: A Spatial Approach to Improve Coastal and Small Islands Management Tubagus Solihuddin; Dwi Amanda Utami; Hadiwijaya Lesmana Salim; Eva Mustikasari
Jurnal Segara Vol 16, No 2 (2020): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (877.141 KB) | DOI: 10.15578/segara.v16i2.8385

Abstract

The Karimunjawa Islands are situated in the offshore of Jepara region of Central Java with abundant coastal and marine resources including coral reefs. The reef geomorphology appears typical of fringing reefs worldwide comprising reef flat, reef crest and reef slope. The reef geomorphic profiles are generally gently sloping seaward with slightly raised reef crest along the reef edge. The reefs slope moderately (15-30°) at the upper forereef slope (~5-10 m depth) and tend to drop steeply, sometimes almost vertical, at depths of 10-30 m. The coral communities are found from the intertidal to a depth of about 15 m, with the most vigorous development occurring between 1.5 to 5 m. The reef flats have low coral cover and are extensively covered by a mixture of seagrass beds and carbonate sand. The reef crests, which mark boundaries between reef flat and upper forereef slope, are mainly colonized by mixed Acropora corals, mainly A. Hyacinthus. The forereef slopes have substantial coral growth prevailing mixed branching Acropora, Porites cylindrica and Porites sp. Sediments on the reef flats are mainly bioclastic materials derived from reef-erosion, including coral fragments, mollusks, foraminifera, red algae, Halimeda, Echinodermata, aggregate, quartz, and lithic fragments. Seagrass beds, mainly Enhalus, occur on the inner reef flat and are gradually shifted to macroalgae, predominantly Sargassum. The study provides a basic requirement for fisheries management and environmental monitoring for a mid-Sunda Shelf within a biodiversity “hotspot”.
Development of A Simple Method for Detecting Mangrove Using Free Open Source Software Anang Dwi Purwanto; Erwin Riyanto Ardli
Jurnal Segara Vol 16, No 2 (2020): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3940.892 KB) | DOI: 10.15578/segara.v16i2.7512

Abstract

Mangrove forests are becoming attractive natural charms and make everyone to take advantage of the existence of these coastal ecosystems both directly and indirectly. However, the condition of mangrove forests is threatened by their presence due to environmental factors around them. Sustainable mangrove monitoring efforts must always be increased to support the preservation of the mangrove ecosystem. The purpose of this study is to develop a fast and easy mangrove forest identification method based on remote sensing satellite imagery data. The research location chosen was the mangrove area in Segara Anakan, Cilacap. The data image used is Landsat 8 image acquisition on December 3, 2017 with path/row 121/065 obtained from the LAPAN Pustekdata Landsat catalog. The methods used include the Optimum Index Factor (OIF) method for selecting the best channels and the supervised classification method using the Semi-Automatic Classification Plugin (SCP) contained in open source software and provides three algorithm choices for the classification process including Minimum Distance, Maximum Likelihood and Spectral Angle Mapping. The results show the combination of RGB 564 (NIR+SWIR+RED) was the best in the identification of mangrove forests and the Maximum Likelihood classification algorithm was the most optimal in distinguishing mangrove and mangrove classes from both Macro Class and Class levels. The results of the calculation of the area show the mangrove area of 7,037.16 ha. The developed method can produce information on the distribution of mangroves at research sites more quickly, easily, effectively, and efficiently.
The Effectiveness of Artificial Reefs in Improving Ecosystem Health to Increase Coral Reef Resilience Reny Puspasari; Ngurah Nyoman Wiadnyana; Sri Turni Hartati; Rita Rachmawati; Yunaldi Yahya
Jurnal Segara Vol 16, No 2 (2020): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (691.982 KB) | DOI: 10.15578/segara.v16i2.9093

Abstract

Some coral bleaching phenomena related to climate variability (ENSO or IOD) lead to coral mortality resulting in ecosystem damage and decreased ecosystem health.  The artificial reef is one of the management efforts adopted by stakeholders to restore coral reef conditions. Thriving artificial reefs could extend coral coverage and provide a new habitat for several marine organisms and divert anthropogenic pressure on natural coral ecosystems. The current research aims to identify the impact of artificial reef installment on ecosystems and fisheries. Three indicators for health coral reef ecosystems were determined: increased coral cover, biofouling organism, and fish abundance and diversity. An index to measure the artificial reef impacts on fisheries is fish production after installment.  Data collection was done in 2017 in around Bali area, including the occurrence of coral bleaching, the number of artificial reefs installed, and the case of positive impacts of artificial reefs.  The data were analyzed to measure any changes that occurred after the artificial reef installment.  The results show that an artificial reef installment has a significant impact on increasing coral cover, fouling organisms, and fish abundance and species richness.  The new community structure development varies among the artificial reef depend on the environmental condition.  However, the impact of artificial reef installment could not be directly quantified on fish production due to unavailability monitoring data.
Hydrodynamics Sabang Bay and Its Influence on Near Shore Sediment Transport, Weh Island, Indonesia Ulung Jantama Wisha; Ilham Ilham
Jurnal Segara Vol 16, No 2 (2020): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1099.188 KB) | DOI: 10.15578/segara.v16i2.8980

Abstract

Sabang Bay is one of the significant areas in Weh Island that becomes a center of marine tourism. Recently, massive urban development in coastal areas impacts on the increase of marine pollution and sedimentation issues within the bay. This study aimed to determine tidal current patterns and their influence on evoking sedimentation within the bay. An Acoustic Doppler Current Profiler (ADCP) was installed within the bay for 30 days, which recorded surface elevation, waves, and sea currents. The numerical hydrodynamic model was developed to figure tidal current features out, validated using field observation data. Sediment transport along the coast was determined by comparing the sediment transport and wave energy component in the form of flux equation. Tidal current speed ranging from 0-0.2 m/s moves predominantly southeastward and northwestward during flood and ebb tides, respectively. Significant wave height (Hs) ranges from 0.18-1 m with a period span of 3.5 seconds propagates toward within the bay, resulting in enhanced sedimentation within the gulf caused by the wave-induced scour and turbulence. Sediment budget transported within the bay reaches 1,586.18 m3/year proving that the sediment movement remarkably occurs within the bay wherein the concentration of suspended sediment ranges from 5-35 mg/L and 2-25 mg/L during the high tidal and low tidal conditions, respectively. Scour and turbulence events induced by internal solitary waves generated from the Andaman Sea result in increased coarse-sized sediment deposition when the flood tide occurs. While, during ebb tide, the widespread distribution of suspended sediment will occur over the bay.  
Shoreline Change Dynamics using Digital Shoreline Analysis System in Cemara Besar Island Muhammad Ramdhan; Yulius Yulius; Nur Kholik
Jurnal Segara Vol 16, No 2 (2020): Agustus
Publisher : Pusat Riset Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1883.563 KB) | DOI: 10.15578/segara.v16i2.8360

Abstract

This paper will describe a study to find out the shoreline changes that occurred on Cemara Besar Island along with the accretion and abrasion. Data taken from the images were obtained through google earth as a result of radiometry and geometry correction from Landsat satellites in the last of 5 years. Wind data were obtained from ECMWF (European Centre for Medium-range Weather Forecasts) interm every season for 5 years. Analysis of shoreline changes was carried out using the DSAS (Digital Shoreline Analysis SYSTEM) method and analyzed by wind and sea wave factors involved in each season. The results of the analysis obtained LRR (Linear Regration Rate) and EPR (End Point Rate) values for 5 years, the extent of changes in island land mass, the value of Hs and Ts from the results of wave forecasting using wind data. To simplify the analysis, Cemara Besar Island is divided into 9 segments based on variations in LRR values. The results show that in general Cemara Besar Island have very high accretion rate in segments A, B and E with an average of 3.61 m/year or 5 years and very high abrasion occurred in segment F with an average of -1.01 m. Abrasion occurs with the greatest speed of change in segment A with an average of 4.64 m/year and the largest accretion rate in segment F with an average of -1.21791 m/year. Analysis of oceanographic factors through Wave forecasting data shows that in the west and transition I season, the significant waves height occur with Hs 1.21 m, greater than the eastern season and transition II season with Hs 0.91 m. Dominant wind direction from north (377.50 in west season and transition I, and from east direction (67,25 degre) in east season and transition I season.  Wind-wave propagate according to wind direction and it will be deformed when entering shallow coastal waters. Then affects sediment transport which produces accretion and abrasion on the Cemara Besar Island.

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