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GEJALA INTRUSI AIR LAUT DI DAERAH PESISIR PADELEGAN, PADEMAWU DAN SEKITARNYA Wisnu Arya Gemilang; Gunardi Kusumah
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1117

Sebagian wilayah pesisir Pademawu dan sekitarnya, Pamekasan, dijumpai adanya air tanah payau hingga asin dengan pelamparan yang cukup luas. Tujuan penelitian ini adalah untuk memetakan sebaran air tanah asin hingga payau tersebut, baik pada akuifer dangkal maupun akuifer dalam dan juga untuk mengetahui penyebab keasinan air tanah tersebut. Sebaran air tanah asin dipetakan berdasarkan nilai daya hantar listrik (DHL) dengan kriteria tingkat keasinan sebagaimana ditetapkan oleh Panitia Ad Hoc Intrusi Air Asin Jakarta. Sedangkan penyebab keasinan air tanah dianalisa berdasarkan fasies hidrokimia dengan diagram Trilinier Piper. Hasil penelitian menunjukkan bahwa pada akuifer dangkal air tanah agak payau hingga asin dengan nilai DHL 15.000 µS/cm – 50.000 µS/cm dijumpai pada bagian Selatan Pademawu sepanjang pesisir pantai meliputi Padelegan, Jumiang, Tanjung, Manjungan dan Pademawu Timur. Sedangkan untuk air tanah dalam seluruhnya dalam kondisi tawar dengan nilai DHL 1500 µS/cm, berada pada bagian Utara dari daerah penelitian meliputi kecamatan Tlanakan, Galis, Pamekasan dan Larangan. Berdasarkan nilai DHL bahwa daerah bagian Utara penelitian tidak terdeteksi adanya proses penyusupan air laut pada air tanah.INDICATION OF SEA WATER INTRUSION IN COASTAL PADELEGAN, PADEMAWU AREAIn the part of Pademawu coastal areas, Pamekasan, was found brackish groundwater that spreading progressively. The purpose of this study was to map the distribution of salt to brackish groundwater, both in the shallow aquifer and the deep aquifer and also to find out the cause of the salinity of the ground water. Salt groundwater distribution was mapped based on the electrical conductivity (EC) with a salinity level criteria as established by Panitia Ad Hoc Intrusi Air Asin Jakarta. While the causes of groundwater salinity were analyzed based on hydrochemical facies with Trilinier Piper diagram. The results showed that the shallow groundwater aquifers slightly brackish to salt with DHL value 15,000 μS / cm - 50,000 μS / cm found in the southern part of Pademawu along the coast include Padelegan, Jumiang, Tanjung, Manjungan and Eastern Pademawu. As for the groundwater at deep aquifer entirely in fresh condition with DHL value 1500 μS / cm, located in the northern part of the study area that include Tlanakan, Galis, Pamekasan and Larangan districts. Based on the DHL value, it shown that groundwater of the northern part of the study area was not affected by the sea water intrusion.Keywords: Electric conductivity, sea water intrusion, aquifer, Pademawu

KARAKTERISTIK OSEANOGRAFI FISIK (BATIMETRI, PASANG SURUT, GELOMBANG SIGNIFIKAN DAN ARUS LAUT) PERAIRAN TELUK BUNGUS Try Al Tanto; Semeidi Husrin; Ulung Jantama Wisha; Aprizon Putra; Radha Karina Putri; - Ilham
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1240

Perairan Teluk Bungus berlangsung cukup banyak aktivitas, namun belum ada data-data valid berkaitan dengan parameter oseanografi perairannya. Perlu dilakukan kajian dinamika pesisir, terutama berupa kajian oseanografi fisik, tujuannya adalah diperoleh informasi dasar parameter oseanografi fisik yang berguna untuk kelancaran aktifitas di sekitar perairan. Data batimetri diperoleh dari peta yang dikeluarkan oleh Dishidros, dianalisis berupa tampilan peta 2D dan 3D. Data pasang surut air laut terukur dari alat ukur ADCP yang memiliki sensor tekanan, merupakan alat ukur utama untuk arus laut. Sedangkan data gelombang diperoleh dari ECMWF berupa tinggi gelombang signifikan. Kedalaman laut Teluk Bungus tergolong dangkal, yaitu mencapai 30 m. Bentuk relief dasar lautnya tidak terlihat dampak signifikan dari pengaruh samudera, karena perairan cukup terlindungi oleh bentuk teluk. Pasang surut yang terjadi adalah tipe campuran dominan ganda, tunggang pasut sebesar 139.30 cm (Oktober - November 2014). Gelombang signifikan perairan Teluk Bungus dan sekitarnya (Januari - Oktober 2013) adalah 0.42-1.7 m. Tinggi gelombang cukup besar terjadi terutama tanggal 9 Oktober 2013 hingga 11 Oktober 2013 yaitu 1.5-1.7 m. Arus laut perairan Teluk Bungus umumnya didominasi oleh pengaruh arus zonal, baik arus kedalaman 10.5 m maupun arus pada kedalaman 18.5 m. Kecepatan rata-rata arus kedalaman 10.5 m sebesar 0.0477 m/s, namun terjadi arus cukup besar 0.5240 m/s tanggal 11 November 2013 pukul 14.50 WIB dengan arah Tenggara-Selatan. Pada kedalaman 18.5 m, kecepatan arus rata-rata 0.3799 m/s dan arus maksimum 0.9320 m/s tanggal 14 November 2013 pukul 22.00 WIB dengan arah Barat Daya. CHARACTERISTICS OF PHYSICAL OCEANOGRAPHY (BATHYMETRY, TIDE, WAVE SIGNIFICANT HEIGHT AND SEA CURRRENT) IN BUNGUS BAYBungus bay waters have a lot of activity, but there is no reliable data related to their oceanographic parameters. It is necessary to study their physical oceanography, to acquire basic information of physical oceanographic characteristics that are useful for the daily activities around these waters. Bathymetric data obtained from the map issued by Dishidros, analyzed in the form of 2D and 3D map display. Tide data measured from ADCP measuring devices, a measuring instrument for the major ocean currents, and also HOBO which has a pressure sensor in the device. While the wave data obtained from ECMWF in the form of significant wave height, but it also contained model / forecasting a significant wave height of BMKG. The depth of the bay of Bungus relatively shallow sea, which reaches 30 m. Form of the sea bottom relief not seen a significant impact on the influence of the ocean, because the waters are adequately protected by the shape of the bay. Tide that occur is predominantly a mixture of type double, 139.30 cm (October-November 2013). Significant wave Bungus bay waters and surrounding areas (January-October 2013) is 0.42 to 1.7 m and 0.3 to 2.5 m (August-December 2015). Largest wave height occurs mainly dated October 9, 2013 until October 11, 2013 is 1.5-1.7 m, and 8 to 14 September 2015 to reach 2.25 m. Currents in Bungus bay waters generally dominated by the influence of zonal flows, both the depth current of 10.5 m and 18.5 m. The average velocity of depth current of 10.5 m by 0.0477 m/s, but there was a large current 0.5240 m / sec November 11, 2013 at 14:50 am with the South-East direction. At a depth of 18.5 m, the average current velocity 0.3799 m/s and a maximum current of 0.9320 m/s on 14 November 2013 at 22:00 pm at South West direction. Keywords: Bathymetry, Tidal, Wave, Current, Bungus Bay

KELIMPAHAN FITOPLANKTON DAN KONSENTRASI TSS SEBAGAI INDIKATOR PENENTU KONDISI PERAIRAN MUARA SUNGAI PORONG Ulung Jantama Wisha; Muh Yusuf; Lilik Maslukah
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1298

Pembuangan limbah dan lumpur ke Sungai Porong diduga akan berdampak bagi lingkungan sekitarnya, khususnya meningkatnya konsentrasi padatan tersuspensi (TSS) dan mempengaruhi sebaran fitoplankton di wilayah tersebut. Tujuan dari dilakukannya penelitian ini adalah untuk mengetahui konsentrasi muatan padatan tersuspensi, kekeruhan dan kelimpahan fitoplankton di perairan muara Sungai Porong, Kabupaten Sidoarjo. Metode penelitian yang digunakan adalah metode deskriptif. Data yang dikumpulkan sebagai variabel ukur adalah muatan padatan tersuspensi, kekeruhan, kelimpahan fitoplankton dan kecepatan serta arah arus. Variabel pendukung meliputi data pasang surut dan peta bathimetri wilayah muara Sungai Porong. Data yang diperoleh selanjutnya dianalisis menggunakan program Arc GIS 10, sehingga menghasilkan output berupa distribusi spasial. Konsentrasi muatan padatan tersuspensi 542-885 mg/l. konsentrasi kekeruhan 3.7-20.5 NTU. Kelimpahan fitoplankton 153-238 ind/l. Berdasarkan data tersebut dapat diketahui bahwa sebaran muatan padatan tersuspensi dan kekeruhan memiliki kaitan dengan kelimpahan fitoplankton pada saat surut, meskipun pada kuantitas yang tidak selalu sama. Arah sebaran bergerak ke arah Timur atau menjauhi muara sungai. ABUNDANCE OF PHYTOPLANKTON AND TSS VALUE AS AN INDICATOR FOR PORONG RIVER ESTUARY WATER CONDITIONSDisposal of waste and mud into Porong River is expected to have an impact to the surrounding environment, particularly the increasing concentration of suspended solids (TSS) and affect the distribution of phytoplankton in the region. The purpose of this study was to determine the correlation between the concentration of TSS and abundance of phytoplankton as an indicator for determinate condition of Porong River Estuary. Determining the location of sampling by purposive sampling method. The data were then analyzed with statistical methods and spatially using ArcGIS 10 program. The concentration of suspended solids charge 542-885 mg/L. concentration of 3.7-20.5 NTU turbidity. The abundance of phytoplankton 153-238 ind/L with a diversity index ranged from 0.4 to 0.62. Hydrodynamic modeling simulated using ADCIRC module of SMS 8.1 software with a current velocity in the range of 0 to 0.04 m.s-1. Distribution of TSS and turbidity linked to the abundance of phytoplankton at low tide, although the quantity is not always the same, based on the diversity index and the condition of the Porong River estuary is in category of lightly polluted.Keywords: Diversity Index, Phytoplankton, Porong estuary, Totally Suspended Solids

PENILAIAN KERENTANAN PANTAI DI WILAYAH PESISIR KABUPATEN TUBAN TERHADAP ANCAMAN KERUSAKAN Marita Ika Joesidawati
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1667

Analisa Kerentanan Pantai ini dilakukan di wilayah pesisir pantai utara Jawa Timur khususnya Kabupaten Tuban dengan panjang pantai 65 km. Penelitian ini bertujuan untuk mengembangkan metode pengolahan data penginderaan jauh untuk penentuan parameter terkait CVI (Coastal Vulnerability Index) terhadap ancaman kerusakan dan untuk mengetahui tingkat kerentanan pantai yang diperlukan untuk merumuskan langkah-langkah mitigasi dalam meminimalkan dampak kerusakan pantai. Langkah dari penelitian ini adalah untuk mengumpulkan hidro-oseanografi dan data geologi dan informasi dari kerusakan pesisir dari data sekunder dan survey lapangan secara langsung. Pemanfaatan data penginderaan jauh dari satelit sensor optis serta sistem informasi geografis dapat memberikan informasi spasial sebagian besar parameter-parameter yang diperlukan dalam perhitungan Indeks Kerentanan Pantai. Parameter indeks kerentanan pantai (Coastal Vulnerability Index/CVI) yang digunakan dalam pembobotan Kerentanan pantai terhadap ancaman kerusakan menggunakan 10 variabel fisik pantai, yaitu: (1). Geomorfologi pantai (GF), (2) Ketinggian Permukaan Tanah (Elevasi/E), (3) Tunggang pasut (Tidal Range) rata-rata (TR),(4) Tinggi Gelombang Signifikan (SHW) (5) Kenaikan Muka Air Laut Relatif (SLR), (6) Perubahan Garis Pantai (PGP), (7) Penggunaan Lahan (PL), (8) Litologi (L), (9) Luas Kerusakan Pantai (KP), (10) Lebar sabuk hijau (SH). Pengelompokan kelas dilakukan dengan membaginya berdasarkan persen dengan kisaran antar kelas 20%. Nilai yang kurang dari sama dengan 20% termasuk kelas tidak rentan, 20% – 40% termasuk dalam kelas kurang rentan, 40% – 60% kelas sedang, 60% – 80% masuk dalam kelas rentan, dan lebih dari 80% masuk kelas sangat rentan. Berdasarkan hasil survey, perhitungan dan analisa terhadap seluruh data, diperoleh nilai CVI wilayah pesisir pesisir utara Kabupaten Tuban yang terdiri dari 5 Kecamatan pantai dikelompokkan menjadi 4 kategori kerentanan terhadap ancaman kerusakan, yaitu: kerentanan sangat tinggi (220-275), kerentanan tinggi (165-220), kerentanan sedang (110-165), dan kurang rentan (55-110). Kecamatan Bancar termasuk dalam 4 kategori yaitu kurang rentan sampai sangant rentan, Kecamatan Jenu termasuk daerah yang rentan dan sangat rentan, Kecamatan Palang dan Tambakboyo pada kategori sedang sampai sangat rentan, sedangkan Tuban termasuk pada daerah sedang dan rentan.Kata Kunci : kerentanan pantai, CVI, Inderaja dan SIG, ancaman kerusakan VULNERABILITY ASSESSMENT OF TUBAN DISTRICT COASTAL AREAS TO THE DAMAGING THREAT Coastal Vulnerability analysis was conducted in the northern coast of East Java, especially in Tuban with a coastline ca. 65 km. This research aims to develop remote sensing data processing method for the determination of parameters related to CVI (Coastal Vulnerability Index) against the damaging threat and to determine the level of vulnerability of the coast needed to formulate mitigation measures to minimize the impact of damage to the beach. Steps of this research is to collect oceanographic and hydro-geological data and information from damaged coastal from secondary data and field survey. Utilization of remote sensing data from satellites as well as the optical sensor geographic information systems can provide spatial information most of the parameters required in the calculation of Coastal Vulnerability Index. Parameter of coastal vulnerability index (CVI) that is used in weighting the beach Vulnerability to threats of physical damage using 10 variables, namely: (1). Coastal geomorphology (GF), (2) Elevation (E), (3) Stables tide (Tidal Range) Average (TR), (4) Significant Wave Height (SHW) (5) Sea Level Rise relative (SLR), (6) Changes in Coastline (PGP), (7) Land Use (PL), (8) lithology (L), (9) area of Damage Coast (KP), (10) The width of the green belt (SH). Grading is done by dividing by percent with a range between 20% grade. Values less than or equal to 20%, classes as is not vulnerable, 20% - 40% is included in the class of less susceptible, 40% - 60% of the classes of moderately vulnerable, 60% - 80% as classes vulnerable, and over 80% go to class very susceptible. Based on survey results, calculation and analysis of all data obtained CVI value of coastal areas north coast of Tuban consisting of 5 Districts beach grouped into four categories of vulnerability to the threat of damage, namely: very high susceptibility (220-275), high susceptibility (165 -220), moderate susceptibility (110-165), and less susceptible (55-110). District of Bancar included in four categories: less susceptible very vulnerable, District Jenu including vulnerable areas and are moderately vulnerable, District Palang and Tambakboyo at moderate to very vulnerable category, while Tuban included in the moderate and vulnerable areas.Keywords: Coastal vulnerability, CVI, Remote sensing and GIS, Damaging threat.VULNERABILITY ASSESSMENT OF TUBAN DISTRICT COASTAL AREAS TO THE DAMAGING THREAT Coastal Vulnerability analysis was conducted in the northern coast of East Java, especially in Tuban with a coastline ca. 65 km. This research aims to develop remote sensing data processing method for the determination of parameters related to CVI (Coastal Vulnerability Index) against the damaging threat and to determine the level of vulnerability of the coast needed to formulate mitigation measures to minimize the impact of damage to the beach. Steps of this research is to collect oceanographic and hydro-geological data and information from damaged coastal from secondary data and field survey. Utilization of remote sensing data from satellites as well as the optical sensor geographic information systems can provide spatial information most of the parameters required in the calculation of Coastal Vulnerability Index. Parameter of coastal vulnerability index (CVI) that is used in weighting the beach Vulnerability to threats of physical damage using 10 variables, namely: (1). Coastal geomorphology (GF), (2) Elevation (E), (3) Stables tide (Tidal Range) Average (TR), (4) Significant Wave Height (SHW) (5) Sea Level Rise relative (SLR), (6) Changes in Coastline (PGP), (7) Land Use (PL), (8) lithology (L), (9) area of Damage Coast (KP), (10) The width of the green belt (SH). Grading is done by dividing by percent with a range between 20% grade. Values less than or equal to 20%, classes as is not vulnerable, 20% - 40% is included in the class of less susceptible, 40% - 60% of the classes of moderately vulnerable, 60% - 80% as classes vulnerable, and over 80% go to class very susceptible. Based on survey results, calculation and analysis of all data obtained CVI value of coastal areas north coast of Tuban consisting of 5 Districts beach grouped into four categories of vulnerability to the threat of damage, namely: very high susceptibility (220-275), high susceptibility (165 -220), moderate susceptibility (110-165), and less susceptible (55-110). District of Bancar included in four categories: less susceptible very vulnerable, District Jenu including vulnerable areas and are moderately vulnerable, District Palang and Tambakboyo at moderate to very vulnerable category, while Tuban included in the moderate and vulnerable areas.Keywords: Coastal vulnerability, CVI, Remote sensing and GIS, Damaging threat.

POLA BERAT DAGING RAJUNGAN BERDASARKAN BERAT TUBUH YANG TERTANGKAP DI PERAIRAN SELAT MADURA Muhammad Zainuri
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1565

Informations on ratio of meat blue swimming crab weight have both economically and ecological meanings. The aim of this research is to know actual ratio of the weight of meat where as catches on Selat Madura fishing ground. Samples were taken from October 2012 ~ December 2013 and May 2014 ~ November 2014 by longline and trammelnet. The result showed that having tree (3) modes of average ratio of meat blue swimming crab weight which reached highest on May, October and December of year; whereas the percentage of actual the weight of meat ( ratio between average of the weight of meat and body weight) appeared on June and September of year. Consider result of Zainuri (2015) that the 10 cm wide carapace of blue swimming crab identical with 50 g of body weight, the result of this research also be known that there is tendency slightly increased of percentage of actual meat weight on blue swimming crab’s 50 g of body weight and more. Keywords: ratio of meat, Selat Madura, blue swimming crabPATTERN OF CRAB MEAT WEIGHT BASED ON BODY WEIGHT CAUGHT IN THE MADURA STRAITInformation on ratio of meat blue swimming crab weight have both economically and ecological meanings. The aim of this research is to know actual ratio of the weight of meat whereas catches on Madura Strait fishing ground. Samples were taken from October 2012 - December 2013 and May 2014 - November 2014 by long-line and trammel net. The result showed that having tree (3) modes of average ratio of meat blue swimming crab weight which reached highest on May, October and December of year; whereas the percentage of actual the weight of meat (ratio between average of the weight of meat and body weight) appeared on June and September of year. The result of this research also be known that there is tendency slightly increased of percentage of actual meat weight on blue swimming crab’s 50 g of body weight and more. Keywords: Ratio of meat, Body weight, Madura Strait, blue swimming crab

SIMULASI NUMERIK GELOMBANG (SPECTRAL WAVES) DAN BENCANA ROB MENGGUNAKAN FLEXIBLE MESH DAN DATA ELEVATION MODEL DI PERAIRAN KECAMATAN SAYUNG, DEMAK Koko Ondara; Ulung Jantama Wisha
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1694

Pesisir Kecamatan Sayung merupakan wilayah abrasi di Kabupaten Demak yang terkena dampak paling parah dari kenaikan muka air laut. Tujuan penelitian ini untuk mengetahui dinamika gelombang yang terjadi pada setiap kondisi pasang surut dan pengaruhnya terhadap rob serta overtopping yang terjadi. Metode penelitian adalah deskriptif kuantitatif menggunakan persamaan numerik, simulasi MIKE 21 dan model elevasi ArcGis. Hs tahun 2016 pada pasang purnama 0,015 – 0,359 m dan pada surut purnama 0,009 – 0,358 m. Hasil pengolahan data menunjukkan ada perbedaan yang drastis genangan yang terjadi pada saat pasang dan surut. Luas area model genangan rob pada tahun 2016 sebesar 7200,36 Ha. Untuk jarak terjauh genangan rob dari garis pantai pada tahun 2016 sejauh 10826,7 m. Terdapat peningkatan tinggi gelombang termasuk kondisi pasut purnama dan perbani tiap tahunnya. Hal ini menunjukkan abrasi terjadi di pengaruhi oleh kikisan gelombang yang terjadi secara terus-menerus. Kenaikan muka air laut yang terjadi setiap tahunnya berbanding terbalik dengan luas genangan yang dihasilkan, sehingga perlu dilakukan tindakan yang preventif pada proses tata kelola ruang pesisir. Kata kunci: model elevasi, gelombang, model numerik, banjir rob, SayungNUMERICAL SIMULATION OF SPECTRAL WAVES AND ROB DISASTER USING FLEXIBLE MESH AND DATA ELEVATION MODEL IN WATERS OF SAYUNG DISTRICT, DEMAKCoastline area in subdistrict Sayung is an abrasion area in Demak which has the worst affected of sea level rise. The purpose of this study to determine the wave dynamics that occur in any tidal conditions and their effects on tidal flood and overtopping happened. The research method is quantitative descriptive using numerical equations, MIKE 21 simulation and ArcGIS elevation models. Hs 2016 on a tide 0.015 to 0.359 m and in full retroactively from 0.009 to 0.358 m. The results of data processing showed no drastic difference puddle that occur at high tide and low tide. The area of tidal inundation model in 2016 amounted to 7200.36 Ha. To the farthest distance from the shoreline tidal inundation in 2016 with a distance of 10826.7 m. There are an increasing wave heights including a full moon and neap tide conditions each year. This shows abrasion occurs is influenced by the piling up of waves that occur continuously. Sea level rise that occurs annually is inversely proportional to the resulting inundation area, so we need a preventive action on the processes of governance of coastal areas. Keywords: elevation models, waves, numerical models, tidal flood, Sayung

ANALISIS FATIGUE PADA STRUKTUR KAPAL PENANGKAP IKAN 30 GT - Budianto
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1590

Masyarakat Indonesia yang mata pencaharian sebagai nelayan, memerlukan kapal dan peralatan penangkap ikan yang cukup memadai. Untuk itu perlu dilakukan pengembangan teknologi pada kapal penangkap ikan yang murah, kuat dan modern. Sehingga dikembangkan kapal penangkap ikan dengan kapsitas 30 GT dengan bahan fiberglass. Yang mana bahan fiberglass memiliki kemudahan dalam proses pembentukan lambung dan proses penyambungan bagian-bagian kapal penangkap ikan yang akan dikembangkan tersebut. Pada saat ini kapal fiberglass yang telah banyak dibuat atau dikembangkan di Indonesia memiliki banyak kekurangan, diantaranya kebocoran disambungan dan mudah pecah akibat besarnya ombak yang menimpa. Akibat yang ditimbulkan oleh beban-beban yang bekerja tersebut, akan membentuk sebuah bending moment yang harus mampu diterima oleh struktur kapal penangkap ikan 30 GT tersebut. Dimana modulus struktur kapal penangkap ikan 30 GT tersebut yang akan dirancang, harus memiliki tegangan yang terjadi mampu menahan akibat bending moment dan tidak boleh melebihi dari batas tegangan yang diijinkan. Selanjutnya didapatkan umur kelelahan kapal FRP tersebut, dihitung dari principle stress dari MEH untuk mendapatkan nilai SCF dan diplotkan kedalam kurva S-N. Maka didapatkan umur kekuatan kapal lebih dari 10 tahun. Hal ini dilihat dari hasil damage ratio juga menghasilkan nilai yang cukup baik. STRUCTURE ANALYSIS OF FATIGUE IN 30 GT FISHING VESSEL Indonesian society living as fishermen, need adequate fishing vessels and equipment. It is necessary for the development of the technology on board fishing vessels that are cheap, powerful and modern. Thus developed fishing vessels with capacities of 30 GT with fiberglass. Fiberglass material which has facilities in the process of forming the hull and the process of joining the parts of fishing vessels be developed. At this time of fiberglass boats that have been produced or developed in Indonesia has many deficiencies, including leakage in the join and easily broken due to the high waves. Consequences caused by the burdens of the work, will form a bending moment to be able to be accepted by the structure of the 30 GT fishing vessel. Where modulus structure of the 30 GT fishing vessel will be designed, it should able to withstand tension due to bending moment and shall not exceed the limit allowable tension. Subsequently obtained the fatigue life of the FRP vessels, calculated on the principle stress of MEH to get the value of SCF and plotted into the S-N curve. So we found the age of the ship strength more than 10 years. It is seen from the results of the damage ratio also produces a fairly good value.Keywords: Loading, Strength, Stress, Fatigue

ANALISIS SPASIAL DAN TEMPORAL AKTIVITAS KAPAL IKAN DI PERAIRAN SELATAN ARU MENGGUNAKAN CITRA MODIS DAN RADARSAT-2 Dendy Mahabror; Abdul Rohman Zaky
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1695

Perairan selatan Aru merupakan daerah penangkapan ikan yang potensial dengan sumberdaya ikannya yang berlimpah. Kapal-kapal ikan melakukan penangkapan ikan dengan mempertimbangkan kondisi kesuburan perairan yaitu fenomena upwelling melalui parameter suhu permukaan laut dan kelimpahan konsentrasi klorofil-a. Penggunaan citra MODIS secara periodik dapat menggambarkan waktu dan lokasi upwelling. Variabilitas suhu permukaan laut dan konsentrasi klorofil-a di lintang 7 LS dan 7.5 LS, bujur 133.1 – 136 BT menunjukkan fenomena upwelling pada musim Timur dimana suhu permukaan laut menurun hingga 24 oC sedangkan konsentrasi klorofil-a rata-rata meningkat hingga 3.61 mg/m3. Fenomena downwelling terjadi di musim Barat dimana suhu permukaan laut di lintang yang sama menjadi hangat berkisar 30 oC dengan konsentrasi rata-rata klorofil-a 1 mg/m3. Jumlah kapal ikan yang beroperasi di daerah penangkapan diketahui dengan menggunakan citra Radarsat-2 dan data VMS yang disesuaikan dengan waktu pengambilan citra di setiap bulannya dengan lokasi yang sama. Analisis spasial dan temporal dilakukan untuk mengetahui sebaran kapal ikan pada musim timur saat kesuburan perairan tinggi dimana konsentrasi klorofil-a di titik penangkapan mencapai 5.01 mg/m3 dan jumlah kapal ikan yang beroperasi 150 unit/hari. Pada musim Barat kesuburan perairan rendah dimana konsentrasi klorofil-a di titik penangkapan 1 mg/m3 dan jumlah kapal ikan yang beroperasi 40 unit/hari. KATA KUNCIklorofil-a, Modis, perairan selatan Aru, Radarsat-2, suhu permukaan laut. SPATIAL AND TEMPORAL ANALYSIS OF WATER PRODUCTIVITY AFFECTING ACTIVITIES IN FISHING VESSEL AT SOUTH ARU FISHING GROUND USING MODIS IMAGE AND RADARSAT-2Southern Aru waters is a potential fishing areas with abundant fish resources. Fishing boats catch fish by considering the condition of the waters productivity such as upwelling phenomenon through the parameters of sea surface temperatures and an abundance of chlorophyll-a concentration. The use of MODIS imagery can periodically describe the timing and location of upwelling. Variability of sea surface temperature and chlorophyll-a concentration in latitude 7 LS and 7.5 LS, longitude 133.1 - 136 BT showed the phenomenon of upwelling in the east season where sea surface temperature decreased from 30° C to 24° C while the chlorophyll-a concentration increased by an average of 0,3 mg/m3 to 3.61 mg/m3. Downwelling phenomenon took place in the west season where the sea surface temperature in the same latitude range 30° C to be warm with an average concentration of chlorophyll-a 1 mg/m3. The number of fishing vessels operating in the fishing area known using RADARSAT-2 imagery and data VMS were later adapted to capture images of each month at the same location. Based on the spatial and temporal analysis was conducted to determine the distribution of fishing vessels in the eastern summer time high waters productivity where the concentration of chlorophyll-a at the point reached 5:01 mg m3, the number of fishing vessels in operation increased to 150 units/ ay. While in the West season low waters productivity where the concentration of chlorophyll-a at the point of 1 mg/m3 and the number of ships in operation decreased to below 40 units/day. This suggests that the increase in the number of fishing fleets affected by the level of waters productivity or fishing season in the East to Transition II at the southern Aru Islands waters. Keywords: Chlorophyll-a, Modis, the south of Aru, RADARSAT-2, Sea surface temperature.

DISTRIBUSI NITRAT, OKSIGEN TERLARUT, DAN SUHU DI PERAIRAN SOCAH-KAMAL KABUPATEN BANGKALAN Dewy Septiyanti Yolanda; Firman Farid Muhsoni; Aries Dwi Siswanto
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1052

Kondisi dan dinamika perairan laut sangat dipengaruhi oleh beberapa parameter, diantaranya adalah parameter fisika, kimia, biologi, dan lain sebagainya. Diantara parameter penting tersebut adalah nitrat, oksigen terlarut, dan suhu. Ketiga parameter ini penting karena berpengaruh terhadap kondisi dan kualitas perairan, khususnya di perairan Socah, Kecamatan Kamal, Kabupaten Bangkalan. Tujuan penelitian ini adalah untuk mengetahui karakteristik dan distribusi nitrat, oksigen terlarut, dan suhu di perairan Socah-Kamal Kabupaten Bangkalan. Penelitian dilakukan pada bulan Oktober 2014 dengan 10 titik sampling. Analisa nitrat dianalisa dengan menggunakan spektrofotometri dengan panjang gelombang 410 nm dilakukan di Laboratorium Ilmu Kelautan Universitas Trunojoyo Madura. Hasil analisa menunjukkan konsentrasi nitrat berkisar 0.002-0.022 mg/l, oksigen terlarut berkisar 6,01-9,04 mg/l, dan suhu permukaan berkisar 29.0-32,7˚C. Hasil analisa menunjukkan kondisi baik dan cocok untuk kehidupan biota laut sesuai standar baku mutu yang sudah ditetapkan oleh Kementrian Negara Lingkungan Hidup (KMNLH).Kata Kunci : Nitrat, Oksigen Terlarut, Suhu, Perairan Socah-KamalDISTRIBUTION OF NITRATE, DISSOLVED OXYGEN AND TEMPERATURE IN SOCAH WATERS, DISTRICT OF KAMAL, BANGKALANThe conditions and the dynamics of ocean waters is influenced by several parameters, including the parameters of physics, chemistry, biology, and others. Among the important parameters are nitrates, dissolved oxygen, and temperature. Those parameters are important because it affects the quality and condition of the waters, particularly in Socah waters, District of Kamal, Bangkalan. The purpose of this study was to determine the characteristics and distribution of nitrate, dissolved oxygen, and temperature in the Socah waters, Kamal, Bangkalan. The study was conducted in October 2014 with 10 sampling points. Nitrate was analyzed using spectrophotometry with a wavelength of 410 nm performed at the Laboratory of Marine Science Trunojoyo University of Madura. An analysis showed that nitrate concentrations ranging from 0002-0022 mg/l, dissolved oxygen ranges from 6.01 to 9.04 mg/l, and the surface temperature ranges 29.0-32,7˚C. The analysis shows good condition and suitable for marine life appropriate quality standards set by the Ministry of Environment (KMNLH). Keywords: Nitrates, Dissolved oxygen, Temperature, Socah waters

STUDI TRANSPOR SEDIMEN DI TELUK BENOA MENGGUNAKAN PEMODELAN NUMERIK Herlambang Aulia Rachman; I Gede Hendrawan; I Dewa Nyoman Nurweda Putra
Jurnal Kelautan Vol 9, No 2: Oktober (2016)
Publisher : Department of Marine Sciences, Trunojoyo University of Madura, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jk.v9i2.1617

Teluk Benoa merupakan daerah estuari semi tertutup yang terdapat di wilayah selatan Bali. Kawasan ini merupakan daerah yang menjadi muara bagi beberapa sungai besar yang terdapat di Bali. Sungai merupakan salah satu sumber aliran material seperti angkutan sedimen yang dialirkan menuju ke laut. Proses transpor sedimen di Teluk Benoa dapat didekati dengan pemodelan numerik FVCOM (Finite Volume Coastal Ocean Model) untuk mengetahui distribusi sedimen yang terdapat di daerah teluk. Hasil model numerik menunjukkan bahwa proses pergerakan sedimen akan mengikuti bentuk pola arusnya. Pola pergerakan arus di Teluk Benoa akan mengikuti pola pasang surutnya dimana saat akan pasang pola arus akan mengarah ke dalam teluk dan sebaliknya pada saat surut. Kecepatan arus rata-rata pada bagian mulut mencapai 0.8 m/s pada saat menuju pasang dan 0.9 m/s pada saat menuju surut. Besar kecepatan arus akan mengalami perlambatan pada saat kondisi pasang tertinggi dan surut terendah yakni hanya mencapai rata-rata sekitar 0.3 m/s. Konsentrasi sedimen tertinggi pada saat pasang atau surut terjadi pada bagian dekat muara sungai yang mencapai 100 mg/L dan mulut teluk yang mencapai 150 mg/L. Tingginya konsentrasi sedimen di mulut teluk diakibatkan adanya erosi pada bagian dasar perairan akibat kecepatan arus yang cukup tinggi. Hasil validasi elevasi pasang surut pada model didapatkan root mean square error (RMSE) sebesar 9.18 cm dengan koefisien determinasi (R2) mencapai 0.97. Untuk perbandingan hasil model sedimen dengan data observasi berupa Total Suspended Solid memiliki tingkat korelasi sebesar 0.77. STUDY OF SEDIMENT TRANSPORT AT BENOA BAY USING NUMERICAL MODELLINGBenoa Bay is a semi-enclosed estuary area located in the south of Bali. This area is became estuary for several rivers in Bali. The river is a source of material such as sediment transport stream that flowed into the sea. Sediment transport processes in Benoa Bay can be approximated by numerical modeling FVCOM (Finite Volume Coastal Ocean Model) to determine the distribution of sediments found in the bay area. Research carried out by the whole domain Benoa Bay area in January 2016. The results of numerical models show that the process of sediment movement will follow the current pattern shape. The pattern of the movement of currents in the Benoa Bay will follow the pattern of tide where the current will flow lead into the bay at high tide and vice versa. Average flow velocity at the mouth reaches 0.8 m/s at the time to the tide and 0.9 m / s at the time towards low tide. Current speed will slow down when the condition of the highest and lowest tide that is only reached an average of about 0.3 m/s. The highest sediment concentrations at high tide or low tide occurs in the section near the mouth of the river that reached 100 mg/L and the mouth of the bay, which reached 150 mg/L. The high concentration of sediment at the mouth of the bay due to the erosion of the bottom waters due to the flow velocity is high. The results of the validation by tidal elevation models obtained root mean square error (RMSE) of 9:18 cm with a coefficient of determination (R2) reached 0.97. For the comparison of model results with observational data in the form of sediment Total Suspended Solid has a level of correlation of 0.77.Keywords: Benoa Bay, Sediment, Numerical modelling

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Akhmad Farid

Contact Email jurnalkelautan@trunojoyo.ac.id

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Location Kab. bangkalan, Jawa timur INDONESIA

Abstract

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Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Akhmad Farid

Contact Email
jurnalkelautan@trunojoyo.ac.id

Phone
-

Journal Mail Official
jurnalkelautan@trunojoyo.ac.id

Editorial Address
-

Location
Kab. bangkalan,

Jawa timur

INDONESIA