cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
INDONESIA
Jurnal Kelautan Tropis
Published by Universitas Diponegoro
ISSN : 14108852     EISSN : 25283111     DOI : -
Core Subject :
Arjuna Subject : -
Articles 451 Documents
 37   38   39   40   41 
Pengukuran Tinggi Gelombang Laut Menggunakan Sensor Ultrasonik Berbasis Internet of Things (IOT) Bakhtiar, Deddy; Ashari, Anadila; Herliany, Ervina Nurlaila; Julianti, Lia
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i3.22624

Abstract

Disaster mitigation efforts in coastal areas require information on wave data in situ and accurately, for this reason technology is needed that can measure wave height data in realtime and continuously in order to monitor wave height easily. The purpose of this research is to develop a wave height measurement buoy device equipped with an underwater ultrasonic sensor with data transmission via the internet network. The research stages of developing an internet-based sea wave height measurement tool are designing hardware and software, collecting wave height data and testing the accuracy of the tool. The hardware is a floating buoy, IoT module consisting of JSN-SR04T ultrasonic sensor, ESP 8266 Wemos D1 microcontroller, battery, and router. This tool is connected to the ThingSpeak IoT platform as a database server so that it can be accessed in real time. The results showed that the hardware and software developed functioned well to measure data and send wave height data in real time and continuously. JSN-SR04T sensor measurement data and direct measurements have a significant relationship with a correlation coefficient of 0.56. The validation test results show that the measurement has a storage deviation or error of 8.32% due to the sensitivity of the sensor and the delay in sending data (delay) on average 2 seconds. The coefficient of determination shows that the corrected sensor data can explain 30.9% of the actual sea level data, and the remaining 69.1% is influenced by other factors.   Upaya mitigasi bencana di kawasan pesisir membutuhkan informasi tentang data gelombang secara in situ dan akurat, untuk itu diperlukan teknologi yang dapat mengukur data tinggi gelombang secara realtime dan kontinu agar dapat memantau tinggi gelombang dengan mudah. Tujuan dari penelitian ini adalah untuk mengembangkan suatu perangkat wahana apung (buoy) pengukur tinggi gelombang yang dilengkapi sensor ultrasonik bawah air dengan transmisi data melalui jaringan internet. Tahapan penelitian pengembangan alat pengukuran tinggi gelombang laut berbasis internet yaitu melakukan perancangan perangkat keras dan perangkat lunak, pengambilan data tinggi gelombang dan uji akurasi pada alat. Perangkat keras yang dibuat berupa wahana apung buoy, modul  IoT yang terdiri dari sensor ultrasonik JSN-SR04T, mikrokontroler ESP 8266 Wemos D1, baterai, dan router. Alat ini dihubungkan dengan platform IoT ThingSpeak sebagai server basis data sehingga dapat diakses secara realtime. Hasil penelitian menunjukkan perangkat keras dan perangkat lunak yang dikembangan berfungsi dengan baik dapat melakukan pengukuran data dan pengiriman data  tinggi gelombang secara real time dan terus menerus. Data pengukuran sensor JSN-SR04T maupun pengukuran langsung memiliki hubungan yang signifikan dengan koefesien korelasi sebesar 0,56. Hasil uji validasi menunjukkan pengukuran mengalami deviasi penyimpanan ataupun error sebesar 8,32 % disebabkan karena akibat sensifitas pada sensor dan keterlambatan pengiriman data (delay) rata-rata 2 detik. Koefisien determinasi yang menunjukkan bahwa data sensor terkoreksi dapat menjelaskan sebesar 30,9% data ketinggian air laut sebenanya, dan sisanya sekitar 69,1 % dipengaruhi oleh faktor lain.
Karakterisasi Morfometri dan DNA Barcoding Keong Lola Merah (Rochia nilotica Linnaeus, 1767) dari Kepulauan Kei, Maluku Triandiza, Teddy; Utami, Risnita Tri; Pesilette, Rosmi Nuslah
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i3.24411

Abstract

The lola snail (Rochia nilotica) is an herbivorous gastropod that lives in coral reef ecosystems. R. nilotica is an ecologically important species and has high economic value. This study aims to assess morphometric characterization and DNA barcoding. Analysis of growth patterns shows that red lola snails in the Kei Islands show an allometric growth pattern. Analysis of R. nilotica mitochondrial DNA (mtDNA) sequences resulted in 646 base pairs, containing 14 haplotypes with a total of 18 polymorphic sites. The results showed that the genetic diversity of R. nilotica populations in the Kei Islands was very high, namely nucleotide diversity (Pi) of 0.00460 and haplotype diversity (Hd) of 0.9457. The results of phylogenetic tree analysis showed five main clusters, namely four clusters of R. nilotica from the Kei Islands and one cluster of R. nilotica from Moorea Island and New Caledonia. The value of genetic distance between individuals and between R. nilotica populations is very low, namely 0.0026-0.0056 and 0.0034-0.0052. The results of the haplotype net analysis showed that there was haplotype mixing in all R. nilotica populations in the Kei Islands as indicated by the absence of a particular clade. Keong lola merah (Rochia nilotica) merupakan gastropoda herbivora yang hidup di ekosistem terumbu karang. R. nilotica merupakan spesies yang penting secara ekologis dan memiliki nilai ekonomi tinggi. Penelitian ini bertujuan untuk mengkaji karakterisasi morfometri dan DNA barcoding. Analisis pola pertumbuhan menunjukkan keong lola merah di Kepulauan Kei menunjukkan pola pertumbuhan alometrik. Analisis sekuens DNA mitokondria (mtDNA) R. nilotica menghasilkan 646 pasangan basa, yang mengandung 14 haplotipe dengan jumlah total 18 situs polimorfik. Hasil penelitian menunjukkan bahwa keragaman genetik populasi R. nilotica di Kepulauan Kei sangat tinggi, yaitu keragaman nukleotida (Pi) sebesar 0,00460 dan keragaman haplotipe (Hd) sebesar 0,9457. Hasil analisis pohon filogenetik menunjukkan lima kluster utama, yaitu empat kluster R. nilotica  asal kepulauan Kei dan satu kluster R. nilotica asal Moorea Island dan New Caledonia. Nilai jarak genetik antar individu dan antara populasi R. nilotica sangat rendah yaitu 0,0026-0,0056 dan 0,0034-0,0052. Hasil analisis jaring haplotipe menunjukkan bahwa terjadi percampuran haplotipe pada seluruh populasi R. nilotica di Kepulauan Kei yang ditunjukkan dengan tidak adanya klade tertentu.
Aplikasi Lactococcus lactis sebagai probiotik pada budidaya udang Vanamei skala Laboratorium : analisis status kesehatan udang berbasis pertambahan berat dan performa sistem imunitas seluler Subagiyo, Subagiyo; Triyanto, Triyanto; Larasati, Stefanie Jessica Henny; Agus, Elsa Lusia
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i3.20737

Abstract

This research aims to prove the effectiveness of the application of Lc lactis as a probiotic in laboratory-scale cultivation of P. vanamei shrimp based on its effect on weight gain and cellular immunity performance. Experiments were carried out on 3 Lc lactis isolates, namely U.181, P.32 and W-331 as well as a mixture of these three isolates. Lc. lactis were applied orally through feed (pellets) at a dose of 108 cells/gram of feed. At 7 day intervals during the 35 days of the experiment, the weight of the shrimp was weighed and the hemolymph was taken to then calculate the total number of hemocytes and phagocytic activity. The experimental results showed that the average weight gain was between 106.8 ± 9.78%-138.2 ± 1.68%, while in controls it was 100.7 ± 3.72%. So the treatment effect of adding Lclactis on shrimp weight gain was between 6.0 ± 5.8% - 37.3 ± 3.4%. In this study the average total number of hemocytes in the treatment was between 154.9 ± 4.8 x 105 – 176.2 ± 15 x 105) cells/mL and in the control it was 128.9 ± 1.9 x 105. So the effect size was treatment with the addition of Lc lactis to the total number of hemocytes was 20.1 ± 2.0% to 36.6 ± 9.6%. The average phagocytic activity in the treatment was 42.1 ± 0.8% - 48.3 ± 1.0% while in the control it was 30.4 ± 0.8%. So the magnitude of the treatment effect on phagocytic activity was between 38.1 ± 1.08% - 58.7 ± 1.05%. Based on this research, it can be concluded that Lc Lactis U.181, P.32 and W-331 can be developed as probiotics in shrimp cultivation either singly or in a mixture, because they are able to provide the effect of increasing body weight and increasing the performance of cellular immunity. Penelitian ini bertujuan untuk mendapatkan bukti efektivitas aplikasi Lc lactis sebagai  probiotik  pada  budidaya  udang  P. vanamei  skala  laboratorium  berdasarkan efeknya terhadap pertambahan berat dan performa imunitas seluler. Percobaan dilakukan terhadap 3 isolat Lc lactis yaitu U.181, P.32 dan W-331 serta campuran dari ketiga isolat tersebut. Lc. Lactis diaplikasikan secara oral melalui pakan (pellet)  dengan dosis 108sel/gram pakan. Pada interval waktu 7 hari selama 35 hari waktu percobaan dilakukan penimbangan berat udang dan pengambilan hemolimfe untuk selanjutnya dilakukan penghitungan jumlah total hemosit dan aktivitas fagositosis. Hasil percobaan menunjukkan rata-rata pertambahan berat antara 106,8 ± 9,78%-138,2±1,68%, sedangkan pada kontrol sebesar 100,7±3,72%. Sehingga besarnya efek perlakuan penambahan Lc lactis terhadap pertambahan berat udang antara  6,0 ±5,8 % - 37,3 ±3,4%. Pada penelitian ini rata-rata jumlah total hemosit pada perlakuan antara 154,9 ± 4,8 x 105 – 176,2  ± 15 x 105) sel/mL dan pada kontrol sebanyak 128,9 ± 1,9 x 105. Sehingga besarnya efek perlakuan penambahan Lc lactis terhadap jumlah total hemosit adalah 20,1 ± 2,0 % hingga 36,6 ± 9,6 %. Rata-rata aktivitas fagositosis pada perlakuan adalah 42,1 ± 0,8% - 48,3 ± 1,0% sedangkan pada kontrol sebesar 30,4 ± 0,8%. Sehingga besarnya efek perlakuan terhadap aktivitas fagositosis adalah antara 38,1 ± 1,08% - 58,7± 1,05%. Berdasarkan penelitian ini dapat disimpulkan bahwa Lc lactis U.181, P.32 dan W-331 dapat dikembangkan sebagai probiotik pada budidaya udang baik secara tunggal maupun secara campuran, karena mampu memberikan efek peningkatan berat badan dan peningkatan performa imunitas seluler.
Kluster Gen Biosintetik (NRPS/PKS) Pada Bakteri Sedimen Mangrove Pantai Tirang Semarang Indonesia Widayat, Barra Muzaffar; Pringgenies, Delianis; Setyati, Wilis Ari
Jurnal Kelautan Tropis Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v27i3.22317

Abstract

This study aims to explore biosynthetic gene clusters and antibacterial activity in mangrove sediment bacteria at Tirang Beach, Semarang, Central Java. Research methods include isolating bacteria from seagrass sediments, antibacterial testing against S. aureus and E. coli bacteria, identifying bacteria using the DNA method, and testing the presence of biosynthetic gene clusters. The results showed that the mangrove sediment bacterial isolate with the isolate code B.26.ST.3.4 had the highest antibacterial activity with a value of 28.05 ± 0.9192 against the pathogen E. coli and 23.45 ± 10.2530 against the pathogen S. aureus. Apart from that, there are two other isolates that also have antibacterial activity. Based on bacterial DNA identification, mangrove sediment bacteria that have potential as antibacterials are Bacillus velezensis (B.9.ST.1.4), Bacillus subtilis (B.13.ST.2.2), and Bacillus amyloliquefaciens (B.26.ST.3.4). These three isolates have the NRPS gene, and isolate B.9.ST.1.4 also has the PKS-II gene, while isolate B.26.ST.3.4 has the PKS-I gene. This discovery provides a deeper understanding of the antibacterial potential of mangrove sediment bacteria at Tirang Beach, Semarang. This information can be used to develop natural antibiotics that are more effective and have the potential to fight bacterial infections that are increasingly resistant to conventional antibiotics. The conclusion is that bacteria have potential as antibacterials from mangrove sediment bacteria at Tirang Beach, Semarang through isolation and identification of bacteria. Isolate B.26.ST.3.4 has the highest antibacterial activity against E. coli and S. aureus pathogens. Apart from that, Bacillus velezensis, Bacillus subtilis, and Bacillus amyloliquefaciens also have antibacterial potential. The NRPS gene was found in all three isolates, while isolate B.9.ST.1.4 also had the PKS-II gene and isolate B.26.ST.3.4 had the PKS-I gene. This discovery can provide a deeper understanding of the natural antibiotic potential of mangrove sediment bacteria and can be the basis for further development in the pharmaceutical field.  Penelitian ini bertujuan untuk mengeksplorasi klaster gen biosintesis dan aktivitas antibakteri pada bakteri sedimen mangrove di Pantai Tirang, Semarang, Jawa Tengah. Metode penelitian meliputi isolasi bakteri dari sedimen lamun, uji antibakteri terhadap bakteri S. aureus dan E. coli, identifikasi bakteri dengan metode DNA, dan uji keberadaan klaster gen biosintesis. Hasil penelitian menunjukkan bahwa isolat bakteri sedimen mangrove dengan kode isolat B.26.ST.3.4 memiliki aktivitas antibakteri tertinggi dengan nilai 28,05±0,9192 terhadap patogen E. coli dan 23,45±10,2530 terhadap patogen S. aureus. Selain itu, terdapat dua isolat lain yang juga memiliki aktivitas antibakteri Berdasarkan identifikasi bakteri DNA, bakteri sedimen mangrove yang potensial sebagai antibakteri adalah Bacillus velezensis (B.9.ST.1.4), Bacillus subtilis (B.13.ST.2.2), dan Bacillus amyloliquefaciens (B.26.ST.3.4). Ketiga isolat ini memiliki gen NRPS, dan isolat B.9.ST.1.4 juga memiliki gen PKS-II, sedangkan isolat B.26.ST.3.4 memiliki gen PKS-I. Penemuan ini memberikan pemahaman yang lebih dalam tentang potensi antibakteri dari bakteri sedimen mangrove di Pantai Tirang Semarang. Informasi ini dapat digunakan untuk mengembangkan antibiotik alami yang lebih efektif dan memiliki potensi dalam melawan infeksi bakteri yang semakin resisten terhadap antibiotik konvensional. Kesimpulan bahwa bakteri potensi sebagai antibakteri dari bakteri sedimen mangrove di Pantai Tirang, Semarang melalui isolasi dan identifikasi bakteri. Isolat B.26.ST.3.4 memiliki aktivitas antibakteri tertinggi terhadap patogen E. coli dan S. aureus. Selain itu, Bacillus velezensis, Bacillus subtilis, dan Bacillus amyloliquefaciens juga memiliki potensi sebagai antibakteri. Gen NRPS ditemukan pada ketiga isolat tersebut, sedangkan isolat B.9.ST.1.4 juga memiliki gen PKS-II dan isolat B.26.ST.3.4 memiliki gen PKS-I. Penemuan ini dapat memberikan pemahaman yang lebih dalam tentang potensi antibiotik alami dari bakteri sedimen mangrove dan dapat menjadi dasar untuk pengembangan lebih lanjut dalam bidang farmasi.
Morphology of Spicules of Phyrella sp. (Sea Cucumber) from Demak Waters, Central Java, Indonesia Apriliani, Seka Indah; Widianingsih, Widianingsih; Trianto, Agus; Hartati, Retno
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.25842

Abstract

Phyrella is a genus of sea cucumbers that holds significant economic value and is widely exported for human consumption. Despite its importance, knowledge regarding the species diversity of Phyrella in Indonesian waters, particularly in Demak Waters, remains limited. This study aims to identify the Phyrella species found in this region through morphological analysis of spicules. The identification process involved examining the spicules present in the calcareous ring and various body parts, including the anterior, posterior, ventral, and dorsal regions. Spicules were observed using a light microscope at 100x magnification after dissolving body tissues with a sodium hypochlorite (NaOCl) solution to isolate their structure. The findings revealed four distinct spicule shapes: buttony, mensal, barbed, and barbed wire rod. These spicule characteristics are essential in distinguishing Phyrella species. Based on these morphological features, the sea cucumber species found in Demak Waters was identified as Phyrella fragilis. The results contribute to taxonomic studies and provide insights into the ecological role of Phyrella fragilis in marine ecosystems. Furthermore, this species has potential applications in the food, pharmaceutical, and cosmetic industries due to its rich nutritional content and bioactive compounds. Understanding its morphology and distribution can aid conservation efforts and sustainable resource management.
Karakteristik Tinggi Gelombang Laut di Perairan Halmahera Utara dan Morotai pada Periode Waktu ENSO Tahun 2012-2021 Mudho, Hendrik Trio; Azies, Ibnu Abdul; Setiyadi, Johar; Kisnarti, Engki Andri; Pranowo, Widodo Setiyo
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.25192

Abstract

North Halmahera and Morotai are strategic regions in the North Maluku Islands, Indonesia, rich in marine biodiversity and with great potential in the maritime, trade, and fisheries sectors. These regions serve as crucial routes for maritime transportation and regional trade, making accurate information about the physical conditions of the sea, particularly wave height, essential for ensuring the safety and security of shipping lanes. This study aims to analyze the impact of the El-Nino Southern Oscillation (ENSO) phenomenon on ocean wave heights in the waters of North Halmahera and Morotai during the period from 2012 to 2021. Additionally, the study measures the correlation between the Southern Oscillation Index (SOI) and Significant Wave Height (SWH). The data used in this study include wave data from the Marine Copernicus platform and SOI data obtained from http://www.bom.gov.au/climate/enso/soi/. Three observation stations were selected in the waters of North Halmahera and Morotai to monitor changes and variations in SWH during the ENSO phenomenon. A correlation analysis was conducted to determine the relationship between SOI values and SWH at each observation station. The results indicate that during the El-Nino phase, wave heights decreased significantly at several stations, particularly at stations 1 and 3, with a negative correlation between SOI and SWH. Conversely, during the La-Nina phase, wave heights increased, especially at stations 2 and 3, showing a stronger positive correlation. The relationship between SOI and SWH varied depending on location and time period. This study concludes that ENSO has a significant impact on the variation in wave heights in the waters of North Halmahera and Morotai. These findings are important for supporting maritime safety and managing maritime activities in the region.
Bakteri yang Berasosiasi dengan Karang Keras yang Terinfeksi Penyakit White Syndrome di Perairan Sawopudo, Sulawesi Tenggara, Indonesia Palupi, Ratna Diyah; Sabdaningsih, Aninditia; Ayuningrum, Diah; Sabdono, Agus
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/baf.%v.%i.%Y.%p

Abstract

Coral disease is one of the most significant factors contributing to coral mortality, leading to a reduction in coral cover. The direct causes of coral disease remain a subject of ongoing investigation by researchers at both national and international levels. There is a relationship between corals and microbes that form the coral holobiont, which can be beneficial, harmful, or neutral. This study aims to isolate, purify, and identify bacteria associated with corals infected with white syndrome (WS) at the molecular level through 16S rRNA gene amplification. Coral samples infected with WS were collected from the Sawopudo Waters in Southeast Sulawesi using purposive sampling through snorkeling. The coral life forms sampled included massive, sub-massive, and branching types, collected from approximately three different colonies. Bacterial analysis associated with WS coral disease was conducted in the laboratory, initially with isolation using the spread plate method and purification through quadrant streaking on peptone, yeast, and agar media. Once pure bacterial colonies were obtained, the bacterial isolates associated with WS-infected corals were injected into healthy corals using laboratory-scale Koch's postulates. The results showed 8 (eight) bacterial isolates associated with WS-infected corals (SWS01, SWS02, SWS03, SWS04, SWS05, SWS06, SWS07, and SWS08). Based on Koch's postulates, isolates SWS01 and SWS07 exhibited visual signs of WS disease. Further isolation and purification were only conducted on isolate SWS01. Molecular identification using 16S rRNA gene amplification revealed that isolate SWS01 is closely related to Priestia flexa (99.72% similarity), isolate SWS07 is closely related to Bacillus velezensis (99.68% similarity), and the re-cultured isolate from Koch's postulates is closely related to Alteromonas macleodii (99.64% similarity).Penyakit karang adalah salah satu faktor terpenting penyebab kematian karang dan dapat menurunkan tutupan karang. Penyebab langsung penyakit karang hingga saat ini masih terus dicari oleh para peneliti baik skala nasional maupun internasional. Terdapat hubungan antara karang dengan mikrobia yang membentuk coral holobiont yang dapat bersifat menguntungkan, merugikan, dan netral. Penelitian ini bertujuan untuk mengisolasi, mempurifikasi, dan mengidentifikasi bakteri yang berasosiasi dengan karang terinfeksi white syndrome (WS) secara molekuler dengan amplifikasi gen 16S rRNA. Sampel karang terinfeksi WS diambil di Perairan Sawopudo-Sulawesi Tenggara dengan metode purposive sampling melalui snorkeling. Bentuk pertumbuhan karang yang diambil sebagai sampel adalah massive, sub massive, dan branching yang diambil dari 3 koloni yang berbeda. Analisis bakteri asosiasi karang terinfeksi WS dilakukan di laboratorium dimulai dengan isolasi dengan metode sebar dan purifikasi dengan metode gores kuadran pada media pepton, yeast, dan agar. Setelah diperoleh koloni murni, isolat bakteri yang berasosiasi dengan karang WS diinjeksikan ke karang sehat menggunakan uji Postulat Koch skala laboratorium. Hasil dari penelitian ini adalah ditemukannya 8 (delapan) isolat bakteri yang berasosiasi dengan karang terinfeksi WS dengan kode isolat S.WS.01, S.WS.02, S.WS.03, S.WS.04, S.WS.05, S.WS.06, S.WS.07, dan S.WS.08. Uji Postulat Koch tidak berhasil dalam penelitian ini, akan tetapi isolat bakteri S.WS.01 dan S.WS.07 menunjukkan tanda-tanda penyakit WS secara visual pada saat uji Postulat Koch. Setelah dilakukan identifikasi molekuler menggunakan amplifikasi gen 16S rRNA, isolat S.WS.01 berkerabat dekat dengan Priestia flexa (99,72% kemiripan), isolat S.WS.07 berkerabat dekat dengan Bacillus velezensis (99,68% kemiripan), dan untuk isolat hasil kultur kembali dari Postulat Koch berkerabat dekat dengan Alteromonas macleodii (99,64% kemiripan).
Pengaruh ENSO Dan IOD Terhadap Suhu Permukaan Laut di Perairan Pulau Enggano Amalia, Isra; Lubis, Ashar Muda; Cahyarini, Sri Yudawati
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.25759

Abstract

Enggano Island, located in the Indonesia Ocean, about 178 km away south-west from Bengkulu city, experiences Sea Surface Temperature (SST) variability that may be influenced by global climate phenomena such as the El Niño Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD). This study aims to analyze the influence of ENSO and IOD on SST surrounding Enggano Island using monthly and annual data during the period 1993-2023. The research was carried out descriptively-analytically including temporal patterns of SPL, seasonal anomalies, and correlations between SPL and the NINO 3.4 index and Dipole Mode Index (DMI). The results showed a significant relationship between ENSO and SPL, where El Niño causes an increasing in SST, while La Niña decreases it with a moderate positive correlation (r = 0.5, p = 0.0042). IOD also affects SST with a weaker positive correlation (r = 0.352, p = 0.0523), where positive phases of IOD could increase SST at the region. Seasonally, the highest SST yearly occurred in March-May and the lowest in June-August. In addition, an increasing SST of 0.5°C can be found over the past 31 years, which may contribute to sea level rise with trend of 4.6-4.7 mm/year, higher than the global average. This research emphasizes the importance of understanding the complex interactions between ENSO, IOD and SPL, which impact oceanographic dynamics and coastal ecosystem management.  Pulau Enggano yang terletak di Samudera Indonesia, sekitar 178 km arah barat daya dari kota Bengkulu, mengalami variabilitas Suhu Permukaan Laut (SPL) yang dapat dipengaruhi oleh fenomena iklim global seperti El Nino Southern Oscillation (ENSO) dan Indian Ocean Dipole (IOD). Penelitian ini bertujuan untuk menganalisis pengaruh ENSO dan IOD terhadap SPL di sekitar Pulau Enggano dengan menggunakan data bulanan dan tahunan selama periode 1993-2023. Penelitian dilakukan secara deskriptif-analitik meliputi pola temporal SPL, anomali musiman, dan korelasi antara SPL dengan indeks NINO 3.4 dan Dipole Mode Index (DMI). Hasil penelitian menunjukkan adanya hubungan yang signifikan antara ENSO dan SPL, dimana El Nino menyebabkan peningkatan SST, sedangkan La Nina menurunkannya dengan korelasi positif sedang (r = 0.5, p = 0.0042). IOD juga mempengaruhi SST dengan korelasi positif yang lebih lemah (r = 0.352, p = 0.0523), di mana fase positif IOD dapat meningkatkan SST di wilayah tersebut. Secara musiman, SST tertinggi tahunan terjadi pada bulan Maret-Mei dan terendah pada bulan Juni-Agustus. Selain itu, peningkatan SST sebesar 0,5°C dapat ditemukan selama 31 tahun terakhir, yang dapat berkontribusi pada kenaikan permukaan laut dengan tren 4,6-4,7 mm/tahun, lebih tinggi dari rata-rata global. Penelitian ini menekankan pentingnya memahami interaksi yang kompleks antara ENSO, IOD dan SPL, yang berdampak pada dinamika oseanografi dan pengelolaan ekosistem pesisir.
Analisis Kejadian Banjir ROB di Provinsi Bengkulu Periode 2022-2024 Agustina, Lisa Asyifa; Lubis, Ashar Muda; Pranowo, Widodo Setiyo
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.25833

Abstract

Bengkulu Province is one of the coastal areas prone to tidal flooding due to a combination of various oceanographic and meteorological factors such as tides, wind speed, rainfall, and sea wave height. This study aims to analyze the dominant factors causing tidal floods in Bengkulu Province during the period 2022-2024. Data on tidal flood events were obtained from BPBD and BPS reports of Bengkulu Province, as well as mass media sources. The analysis was conducted using wind data from the European Center for Medium Weather Forecast (ECMWF), rainfall data from the Meteorology, Climatology and Geophysics Agency (BMKG), and tidal prediction data from the Geospatial Information Agency (BIG). The results show that during the west season, tidal floods are triggered by strong westerly winds due to the West Monsoon, full tides, and moderate to high rainfall, as in the events of February 4-6, 2022 and January 26-27, 2023. During the east monsoon, tidal floods are caused by steady southeast winds and high tides due to the East Monsoon, despite low rainfall, as in the events of July 30, 2023 and August 3-5, 2023. In the transitional season, tidal floods tend to be influenced by a combination of full tides, moderate winds and light to moderate rainfall, such as on May 14-15, 2022 and October 16-17, 2024. Factors such as tropical cyclone activity and the Indian Ocean Dipole (IOD) also contribute significantly to the increased risk of tidal flooding, particularly strengthening winds and increasing rainfall in certain seasons.  Provinsi Bengkulu merupakan salah satu wilayah pesisir yang rawan terkena banjir rob akibat kombinasi berbagai faktor oseanografis dan meteorologis seperti pasang surut, kecepatan angin, curah hujan, dan tinggi gelombang laut. Penelitian ini bertujuan untuk menganalisis faktor dominan penyebab banjir rob di Provinsi Bengkulu selama periode 2022–2024. Data kejadian banjir rob diperoleh dari laporan BPBD dan BPS Provinsi Bengkulu, serta sumber media massa. Analisis dilakukan dengan menggunakan data angin dari European Center for Medium Weather Forecast (ECMWF), data curah hujan dari Badan Meteorologi, Klimatologi, dan Geofisika (BMKG), serta data prediksi pasang surut dari Badan Informasi Geospasial (BIG). Hasil penelitian menunjukkan bahwa pada musim barat, banjir rob dipicu oleh angin barat yang kuat akibat Monsun Barat, pasang purnama, dan curah hujan sedang hingga tinggi, seperti pada kejadian 4–6 Februari 2022 dan 26–27 Januari 2023. Selama musim timur, banjir rob disebabkan oleh angin tenggara yang stabil dan gelombang tinggi akibat Monsun Timur, meskipun curah hujan rendah, seperti pada kejadian 30 Juli 2023 dan 3–5 Agustus 2023. Pada musim peralihan, banjir rob cenderung dipengaruhi oleh kombinasi pasang purnama, angin sedang, dan curah hujan ringan hingga sedang, seperti pada 14–15 Mei 2022 dan 16–17 Oktober 2024. Faktor-faktor seperti aktivitas tropikal siklon dan Indian Ocean Dipole (IOD) juga memberikan kontribusi signifikan terhadap peningkatan risiko banjir rob, terutama memperkuat angin dan meningkatkan curah hujan pada musim tertentu.
Mangrove Litterfall and Its Carbon Contribution: A Study on Coastal Carbon Reserves in Sungai Nibung Village, West Kalimantan Sofiana, Mega Sari Juane; Safitri, Ikha; Mardianto, Tomi; Farhaby, Arthur Muhammad
Jurnal Kelautan Tropis Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jkt.v28i1.25902

Abstract

Mangroves play an essential ecological roles, such as providing habitats for various organisms and contributing to reducing CO2 emissions from human activities. These emissions are one of the main causes of global warming and climate change. This study aims to analyze the litter production rate and carbon content of mangrove litter in Sungai Nibung Village, Kubu Raya Regency, West Kalimantan. Sampling of mangrove litter was conducted for 14 days using a 1x1 m2 litter trap with a mesh size of 0.2 cm. The litter traps have been placed in 9 stations. Litter samples were collected on the 7th and 14th days, including parts of mangroves (leaves, twigs, flowers, and fruits) that naturally fell. Result of the study showed the total litter production rate ranged from 4.95 to 30.07 tons/ha/year, and the findings reveal a clear hierarchy in litter production with the composition being leaves > twigs > propagules/fruits > flowers. Leaves litter production rate is notably high, followed by twigs which represent the second-largest portion, then fruits, and flowers. Meanwhile, the total carbon content varied across sampling station, accounting for 2.30–23.59 tons/ha/year. This research provides essential baseline data for Sungai Nibung Village and highlights the potential of mangroves as significant carbon sinks. The results can be utilized for ecosystem-based coastal management and mangrove restoration aligned with regional environmental policies.

Page 39 of 46 | Total Record : 451

 37   38   39   40   41 

Filter by Year

2015 2026


Reset
Filter By Issues
All Issue Vol 29, No 1 (2026): JURNAL KELAUTAN TROPIS Vol 29, No 1 (2026): JURNAL KELAUTAN TROPIS (inpress) Vol 28, No 3 (2025): JURNAL KELAUTAN TROPIS Vol 28, No 2 (2025): JURNAL KELAUTAN TROPIS Vol 28, No 1 (2025): JURNAL KELAUTAN TROPIS Vol 27, No 3 (2024): JURNAL KELAUTAN TROPIS Vol 27, No 2 (2024): JURNAL KELAUTAN TROPIS Vol 27, No 1 (2024): JURNAL KELAUTAN TROPIS Vol 26, No 3 (2023): JURNAL KELAUTAN TROPIS Vol 26, No 2 (2023): JURNAL KELAUTAN TROPIS Vol 26, No 1 (2023): JURNAL KELAUTAN TROPIS Vol 25, No 3 (2022): JURNAL KELAUTAN TROPIS Vol 25, No 2 (2022): JURNAL KELAUTAN TROPIS Vol 25, No 1 (2022): JURNAL KELAUTAN TROPIS Vol 24, No 3 (2021): JURNAL KELAUTAN TROPIS Vol 24, No 2 (2021): JURNAL KELAUTAN TROPIS Vol 24, No 1 (2021): JURNAL KELAUTAN TROPIS Vol 23, No 3 (2020): JURNAL KELAUTAN TROPIS Vol 23, No 2 (2020): JURNAL KELAUTAN TROPIS Vol 23, No 1 (2020): JURNAL KELAUTAN TROPIS Vol 22, No 2 (2019): JURNAL KELAUTAN TROPIS Vol 22, No 1 (2019): JURNAL KELAUTAN TROPIS Vol 21, No 2 (2018): JURNAL KELAUTAN TROPIS Vol 21, No 1 (2018): JURNAL KELAUTAN TROPIS Vol 20, No 2 (2017): JURNAL KELAUTAN TROPIS Vol 20, No 1 (2017): JURNAL KELAUTAN TROPIS Vol 19, No 2 (2016): JURNAL KELAUTAN TROPIS Vol 19, No 1 (2016): JURNAL KELAUTAN TROPIS Vol 18, No 3 (2015): JURNAL KELAUTAN TROPIS Vol 18, No 2 (2015): JURNAL KELAUTAN TROPIS Vol 18, No 1 (2015): JURNAL KELAUTAN TROPIS More Issue