Jurnal Kelautan: Indonesian Journal of Marine Science and Technology
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PENILAIAN KERENTANAN PANTAI DI WILAYAH PESISIR KABUPATEN TUBAN TERHADAP ANCAMAN KERUSAKAN
No full textAnalisa 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
ANALISIS JULAT PASANG SURUT (TIDAL RANGE) DAN PENGARUHNYA TERHADAP SEBARAN TOTAL SEDIMEN TERSUSPENSI (TSS) DI PERAIRAN TELUK PARE
No full textANALYSIS OF TIDAL RANGE AND ITS EFFECT ON DISTRIBUTION OF TOTAL SUSPENDED SOLID (TSS) IN THE PARE BAY WATERSPare Bay conditions is closely related to the mechanism of circulation in Makasar Strait. One of the problems that occur in Pare Bay waters is increased turbidity and low dynamics of transport inside the bay, which caused silting in some parts of the bay. The aim of this study was to determine tidal range characteristics and the influence of suspended sediment distribution as analysis of the sedimentation process and siltation at Pare bay. Descriptive quantitative method was used and the survey location was based on purposive sampling method. Tidal type in Pare Bay water was mix mainly semidiurnal tides with Formzahl Value was 0.895. The value of the water level below the lowest tide (Z0) was 1036.44 cm. Mean sea level (MSL) value was 1107.97 cm. The vertical datum of MHHWS and MLLWS were 1143.47 cm and 1072.47 cm. Tidal range cycle in spring condition was 102-129,56 cm bigger than cycle in neap condition ranged from 55.53-82.47 cm. TSS concentrations ranged from 0-7.0 mg/L in the surface and ranged from 0- 10.0 mg/L in 5 meters depth. At high tide down, sediment was settling and at the time of high tide, sediment mixed back.Keywords: Pare Bay, suspended solid, tidal range, tide.ABSTRAKKondisi perairan di Teluk Pare sangat berkaitan dengan mekanisme sirkulasi di Selat Makasar, Permasalahan yang terjadi di Teluk Pare salah satunya adalah tingginya tingkat kekeruhan dan rendahnya dinamika transport didalam teluk yang menyebabkan pendangkalan di beberapa bagian teluk. Tujuan dari penelitian ini adalah mengetahui karakteristik julat pasang surut dan pengaruhnya terhadap sebaran sedimen tersuspensi sebagai analisis proses sedimentasi dan pendangkalan di perairan Teluk Pare. Metode penelitian yang digunakan adalah deskriptif kuantitatif, metode penentuan lokasi titik pengambilan sampel air yaitu metode purposive sampling. Tipe pasang surut Teluk Pare adalah campuran condong harian ganda dengan nilai bilangan formzahl sebesar 0,895. Nilai muka air dibawah surut terendah (Z0) sebesar 1036,44 cm. Nilai mean sea level (MSL) sebesar 1107,97 cm. Datum vertikal MHHWS dan MLLWS memiliki nilai 1143, 47 cm dan 1072,47 cm. Julat pasang (tidal range) siklusan saat siklus pasang purnama yaitu 102–129,56 cm lebih besar daripada siklus pasang perbani yang berkisar 55,53-82,47 cm. Konsentrasi TSS berkisar antara 0-7,0 mg/L pada permukaan dan berkisar antara 0–10 mg/L pada kedalaman 5 meter, pada saat pasang turun sedimen sudah mulai mengendap dan pada saat pasang naik sedimen teraduk kembali.Kata kunci: julat pasang, pasang surut, sedimen tersuspensi, Teluk Pare
POLA BERAT DAGING RAJUNGAN BERDASARKAN BERAT TUBUH YANG TERTANGKAP DI PERAIRAN SELAT MADURA
No full textInformations 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 cra
BIODIVERSITAS DAN POPULASI IKAN KARANG DI PERAIRAN SELAT SEMPU SENDANG BIRU KABUPATEN MALANG JAWA TIMUR
No full textREEF FISH BIODIVERSITY AND POPULATION IN SEMPU STRAIT WATERS SENDANG BIRU MALANG REGENCY EAST JAVAReef fish is one of the conspicuous inhabitant in the reef ecosystem. Damage to coral reefs in many countries due to human factors (anthropogenic) and naturally has an impact on the abundance of different species of reef fish. Over fishing is one of the causes of death of reef fish are widely reported. The nature reserve of Sempu Island also became conservation areas for reef fish. Monitoring of reef fish actually can determine on condition of coral reefs, fisheries potential and suitability of ecosystem based on the number of fish that live in the surrounding reef. Observations were made at 3 m depth in the Sempu strait. We used the Reef Check line intercept transect along 100 meters in two research stations. Result showed that 5 families of reef fishes was found, there were Chaetodontidae, Haemulidae, Lutjanidae, Scaridae and Muraenidae. Diversity Index (H ') reef fish in Teluk Semut was 0.215, and dominance index (C) was 0.083. Observations showed that coral reef conditions have correlation to the distribution of reef fish, and the presence of reef fishes can be used as bio indicator of the coral reef damage. Keywords: coral reef, nature reserve, reef check, reef fishes, Sempu Island.ABSTRAKIkan karang adalah salah satu penyusun ekosistem utama di terumbu. Kerusakan terumbu karang di berbagai negara diakibatkan faktor manusia (anthropogenic) dan alamiah telah berdampak pada kelimpahan berbagai jenis ikan karang. Over fishing adalah salah satu penyebab kematian ikan karang yang banyak dilaporkan. Pulau Sempu yang berstatus cagar alam menjadi kawasan konservasi bagi ikan karang. Pengamatan ikan karang dilakukan untuk mengetahui kondisi terumbu karang, potensi perikanan dan kesesuaian ekosistem berdasarkan jumlah ikan karang yang hidup di sekitarnya. Pengamatan dilakukan pada kedalaman 3 meter di Selat Sempu Kabupaten Malang Jawa Timur. Metode yang digunakan dalam penelitian ini adalah metode Reef Check menggunakan Line Intercept Transect sepanjang 100 meter. Ikan yang ditemukan adalah dari family Chaetodontidae, Haemulidae, Lutjanidae, Scaridae dan Muraenidae. Indeks Keanekaragaman (H’) ikan karang di Teluk Semut sebesar 0.215, Indeks Dominansi (C) yaitu sebesar 0.083. Hasil pengamatan menunjukan adanya hubungan antara kondisi terumbu karang dan potensi perairan dengan keberadaan ikan karang. Kata kunci: cagar alam, ikan karang, Pulau Sempu, reef check, terumbu karang
KELIMPAHAN FITOPLANKTON DAN KONSENTRASI TSS SEBAGAI INDIKATOR PENENTU KONDISI PERAIRAN MUARA SUNGAI PORONG
No full textPembuangan 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 Solid
SIMULASI NUMERIK GELOMBANG (SPECTRAL WAVES) DAN BENCANA ROB MENGGUNAKAN FLEXIBLE MESH DAN DATA ELEVATION MODEL DI PERAIRAN KECAMATAN SAYUNG, DEMAK
No full textPesisir 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, Sayun
KOMUNITAS IKAN KARANG DI PERAIRAN TAMAN WISATA ALAM (TWA) BATUANGUS, KOTAMADYA BITUNG, PROVINSI SULAWESI UTARA
No full textREEF FISH COMMUNITY IN THE BATUANGUS NATURE PARK, MUNICIPALITY OF BITUNG, NORTH SULAWESI PROVINCEResearch was conducted at 4 point dive sites in TWA Batuangus and 1 tourist sites as a comparison site to see the condition of coral reef ecosystems that include coral cover and reef fish communities’ information. Live coral cover obtained generally show in moderate category (25 to 49.9%). Coral genus recorded in 33 transects genus were 27 genera of hard corals and 6 genus of soft corals. Reef fish recorded consists of 195 species of reef fish and 37 families. Locations in the TWA Batuangus which have relatively good conditions, is Batu Beach location where had higher abundance and biomass compared to other locations. Magic Rock seen better than that of TWA Batuangus, based from the condition of coral and targeted fish. This is most likely because the location of TWA Batuangus is the fishing area for the surrounding communities while Magic Rock is became one of the important diving spot in the Lembeh Strait. Reef fish community structure based on ecological indices are in unstable condition (H' were in low to moderate, E were depressed until labile and C were low). The similarity of reef fish species grouping Hall Batuangus separated with other sites because of the characteristics of the location in the form of semi-enclosed bays where the circulation of currents which do not enter into the bay which makes limiting the distribution of coral and fish.Keywords: abundance, biomass, Batuangus, reef fish community structure, wildlife nature.ABSTRAKPenelitian sebanyak 4 titik penyelaman di TWA Batuangus dan 1 lokasi wisata sebagai pembanding dilakukan untuk melihat kondisi ekosistem terumbu karang yang meliputi informasi tutupan karang dan komunitas ikan karang. Tutupan karang hidup yang didapatkan menunjukkan umumnya berada pada kategori sedang (25–49,9 %). Genus karang yang tercatat masuk di dalam transek sebanyak 33 genus yang terdiri dari 27 genus karang keras dan 6 genus karang lunak. Ikan karang yang dicatat/ditemukan dalam survei derah dangkal ini terdiri dari 195 species ikan karang yang termasuk dalam 37 famili. Lokasi di dalam TWA Batuangus yang memiliki kondisi relatif baik yaitu di lokasi Pantai Batu dimana memiliki kelimpahan dan biomassa terbaik dibanding lokasi lainnya. Lokasi pembanding Magic Rock sedikit lebih baik daripada TWA Batuangus, jika dilihat dari kondisi karang serta ikan target. Hal ini kemungkinan karena lokasi TWA Batuangus menjadi daerah penangkapan ikan bagi masyarakat sekitar, sedangkan Magic Rock yang menjadi salah satu spot penyelaman penting di Selat Lembeh. Struktur komunitas ikan karang berdasarkan indeks ekologinya berada dalam kondisi labil (H’ masuk rendah hingga sedang, E tertekan hingga labil dan C yang rendah). Kesamaan species ikan karang mengelompokkan site Hall Batuangus terpisah dengan site lainnya karena karakteristik lokasi yang berupa teluk semi tertutup dimana sirkulasi arus yang tidak masuk kedalam teluk yang menjadikan pembatas distribusi karang dan ikan yang ada di dalamnya. Kata kunci: biomassa, Batuangus, kelimpahan, struktur komunitas ikan karang, Taman Wisata Alam
RESISTANCE COMPONENT ANALYSIS OF TRADITIONAL FISHING BOAT IN CILACAP
No full textRESISTANCE COMPONENT ANALYSIS OF TRADITIONAL FISHING BOAT IN CILACAPMonohull fishing boats used to catch fish is modified into a catamaran boat. The purpose of this modification is to get more fish. Catamaran ship has a double hull, but with the double hull ships resulted in increasingly complex resistances. It is interesting to study in depth about the resistance components of Catamaran boat. Resistance Components not only consist of surge resistance, frictional resistance, and the form resistance but with the distance between demihull causing interference waves. There are many research results of Catamaran boat in that aspect, but the data and information obtained from the experiment is still inadequate. In addition, there is still lack of accuracy particularly in predicting interference resistance component in calm water (calm-water resistance) as a result of the distance between the demihull. This study aims to describe the resistance component at Catamaran boat by using slender body method. Keywords: catamaran, Cilacap, slender body method ABSTRAK Kapal ikan monohull yang biasa digunakan untuk mencari ikan dimodifikasi menjadi kapal catamaran. Tujuan modifikasi ini untuk mendapatkan muatan ikan yang lebih banyak. Kapal Catamaran mempunyai dua lambung, tetapi dengan adanya dua lambung mengakibatkan hambatan kapal semakin kompleks. Menarik untuk dikaji lebih lanjut tentang komponen hambatan kapal Catamaran. Komponen hambatan tidak hanya terdiri dari hambatan gelombang, hambatan gesek, dan hambatan bentuk namun dengan adanya jarak antar demihull sehingga menimbulkan interferensi gelombang. Sudah banyak dijumpai hasil riset kapal Catamaran pada aspek tersebut, tetapi data dan informasi yang diperoleh dari eksperimen masih kurang memadai. Disamping itu, masih ditemukan ketidak-akurasian khususnya dalam memprediksi interferensi komponen hambatan pada air tenang (calm-water resistance) akibat dari adanya jarak antar demihull tersebut. Penelitian ini bertujuan untuk memaparkan komponen hambatan pada kapal Catamaran dengan menggunakan slender body method. Kata kunci: catamaran, Cilacap, slender body methodMonohull fishing boats used to catch fish is modified into a catamaran boat. The purpose of this modification is to get more fish. Catamaran ship has a double hull, but with the double hull ships resulted in increasingly complex resistances. It is interesting to study in depth about the resistance components of Catamaran boat. Resistance Components not only consist of surge resistance, frictional resistance, and the form resistance but with the distance between demihull causing interference waves. There are many research results of Catamaran boat in that aspect, but the data and information obtained from the experiment is still inadequate. In addition, there is still lack of accuracy particularly in predicting interference resistance component in calm water (calm-water resistance) as a result of the distance between the demihull. This study aims to describe the resistance component at Catamaran boat by using slender body method. Keywords: catamaran, Cilacap, slender body method ANALISA KOMPONEN HAMBATAN KAPAL IKAN TRADISIONAL DI PERAIRAN CILACAPABSTRAK Kapal ikan monohull yang biasa digunakan untuk mencari ikan dimodifikasi menjadi kapal catamaran. Tujuan modifikasi ini untuk mendapatkan muatan ikan yang lebih banyak. Kapal Catamaran mempunyai dua lambung, tetapi dengan adanya dua lambung mengakibatkan hambatan kapal semakin kompleks. Menarik untuk dikaji lebih lanjut tentang komponen hambatan kapal Catamaran. Komponen hambatan tidak hanya terdiri dari hambatan gelombang, hambatan gesek, dan hambatan bentuk namun dengan adanya jarak antar demihull sehingga menimbulkan interferensi gelombang. Sudah banyak dijumpai hasil riset kapal Catamaran pada aspek tersebut, tetapi data dan informasi yang diperoleh dari eksperimen masih kurang memadai. Disamping itu, masih ditemukan ketidak-akurasian khususnya dalam memprediksi interferensi komponen hambatan pada air tenang (calm-water resistance) akibat dari adanya jarak antar demihull tersebut. Penelitian ini bertujuan untuk memaparkan komponen hambatan pada kapal Catamaran dengan menggunakan slender body method. Kata kunci: catamaran, Cilacap, slender body metho