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Utilization of Satellite Imagery for Mapping the Distribution of Seagrass on Buhung Pitue Island Rosalina, Dwi; Arafat, Yasser; Wahda, A Nurtasya; Rombe, Katarina Hesty; Khasanah, Ruly Isfatul; Sofarini, Dini
Indonesian Journal of Geography Vol 56, No 1 (2024): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.82259

Buhung Pitue Island has seagrass beds those which are spread almost evenly along its coast. Research using remote sensing technology in an effort to support seagrass conservation in Indonesia needs to be carried out. Spatial data is relatively easy to obtain because there are many types of images with various spatial resolutions. The image can be obtained on google earth. Analysis of the distribution of seagrass areas was obtained by digitizing on screen in ArcGIS software, namely in seagrass areas where the boundaries are known. Digitizing is conducted by enlarging the seagrass area in the downloaded image, performing radiometric and geometric corrections, and digitizing to create a shapefile (shp) storing the location, shape, and attributes of geographic features. The seagrass distribution area of Buhung Pitue Island was of 36.5 Ha in 2014 and was of 39.6 in 2021. The rate of change in area from 2014 to 2021 was of 0.085% (an increase of 3.1 ha). The distribution area of seagrass has increased due to natural factors and restrictions on human activities during the COVID-19 pandemic. In addition, another factor supporting the increase in seagrass distribution is the abundance of Enhalus acoroides seagrass species growing and spreading over long distances. The sea surface temperature was high, which was 30.37 °C, while the current speed was categorized as slow because it was around 0.01 m/s. Although the results are obtained from high-resolution imagery, an accuracy test still needs to be conducted.

Assessing changes in the mangrove ecosystem land area of Tanakeke Island, Takalar Regency, using Landsat 8 imagery Rosalina, Dwi; Rombe, Katarina Hesty; Arafat, Yasser; Jamil, Khairul; Hawati, Hawati; Sabilah, Anisa Aulia; Warni, Warni; Leilani, Ani; Ruzuqi, Rezza; Sari, Suci Puspita; Utami, Eva
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 13, No 2 (2024): AUGUST 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.2.33697

Rewataya Village is situated on Tanakeke Island, within the Takalar Regency. Despite its significance, previous studies have not addressed the mapping of changes in mangrove land area within this locale. The present research aimed to fill this gap by assessing alterations in mangrove land area from 2013 to 2023, alongside examining density and canopy cover conditions. The method employed for mapping changes in land area entailed utilizing the unsupervised method with maximum likelihood classification. Additionally, the assessment of mangrove conditions involved employing plot line transects to determine species density and hemispherical photography methods to evaluate canopy cover. Notably, two types of mangroves, namely Rhizophora mucronata and Rhizophora apiculata, are prevalent in this village. The mangrove species density in Rewataya Village, Tanakeke Island, is categorized as good. In addition, the canopy cover in Rewataya Village falls within the classification of very dense according to mangrove damage criteria. However, there has been a notable reduction in the mangrove ecosystem area between 2013 and 2023, with a decrease of 42.28 hectares (from 367.13 hectares to 324.84 hectares).Keywords: MangroveLandsat 8Rewataya villageUnsupervised

Assessing changes in the mangrove ecosystem land area of Tanakeke Island, Takalar Regency, using Landsat 8 imagery Rosalina, Dwi; Rombe, Katarina Hesty; Arafat, Yasser; Jamil, Khairul; Hawati, Hawati; Sabilah, Anisa Aulia; Warni, Warni; Leilani, Ani; Ruzuqi, Rezza; Sari, Suci Puspita; Utami, Eva
Depik Jurnal Ilmu Ilmu Perairan, Pesisir, dan Perikanan Vol 13, No 2 (2024): AUGUST 2024
Publisher : Faculty of Marine and Fisheries, Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/depik.13.2.33697

Rewataya Village is situated on Tanakeke Island, within the Takalar Regency. Despite its significance, previous studies have not addressed the mapping of changes in mangrove land area within this locale. The present research aimed to fill this gap by assessing alterations in mangrove land area from 2013 to 2023, alongside examining density and canopy cover conditions. The method employed for mapping changes in land area entailed utilizing the unsupervised method with maximum likelihood classification. Additionally, the assessment of mangrove conditions involved employing plot line transects to determine species density and hemispherical photography methods to evaluate canopy cover. Notably, two types of mangroves, namely Rhizophora mucronata and Rhizophora apiculata, are prevalent in this village. The mangrove species density in Rewataya Village, Tanakeke Island, is categorized as good. In addition, the canopy cover in Rewataya Village falls within the classification of very dense according to mangrove damage criteria. However, there has been a notable reduction in the mangrove ecosystem area between 2013 and 2023, with a decrease of 42.28 hectares (from 367.13 hectares to 324.84 hectares).Keywords: MangroveLandsat 8Rewataya villageUnsupervised

Correlation between Sea Surface Temperature and Rainfall Intensity in Untia Waters, Makassar (2019–2024): Korelasi Suhu Permukaan Laut Terhadap Intensitas Curah Hujan Tahun 2029-2024 di Perairan Untia, Makassar Sabilah, Anisa Aulia; Rombe, Katarina Hesty; Najih, Muhammad Roin; Jamil, Khairul; Rosalina, Dwi; Fatiha, Nurul
Jurnal Ilmiah AgriSains Vol. 26 No. 2 (2025): Jurnal Ilmiah AgriSains
Publisher : Fakultas Peternakan dan Perikanan, Universitas Tadulako, Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/jiagrisains.v26i2.2025.79-91

Perairan Untia merupakan salah satu kawasan pesisir di Makassar yang memiliki aktivitas perikanan dan ekonomi yang tinggi. Perubahan pola curah hujan dapat memengaruhi aktivitas perikanan, kualitas air, dan ekosistem lokal. Variasi suhu permukaan laut (SPL) yang disebabkan oleh faktor seperti musim Timur dan musim Barat dapat memengaruhi distribusi dan intensitas curah hujan. Penelitian ini menganalisis data SPL dan intensitas curah hujan selama lima tahun terakhir (2019–2024) di Perairan Untia, Makassar. Data diperoleh dari Stasiun Meteorologi Maritim Makassar. Analisis dilakukan menggunakan uji normalitas, uji korelasi Pearson, dan analisis korelasi silang (cross-correlation) untuk mengetahui keterlambatan waktu (time lag) antara perubahan suhu laut dan terjadinya curah hujan. Hasil uji korelasi menunjukkan SPL memiliki hubungan yang lemah dengan curah hujan di Musim Barat (r = -0.31) dan Musim Peralihan I (r = -0.05), serta hubungan kuat hingga sangat kuat di Musim Timur (r = 0.53) dan Musim Peralihan II (r = 0.77). Hasil analisis cross-correlation memperlihatkan adanya time lag sekitar 1 bulan antara peningkatan SPL dan terjadinya hujan, terutama pada Musim Timur dan Peralihan II. Temuan ini penting untuk mendukung prediksi iklim lokal dan manajemen sumber daya pesisir.

Pemetaan Luasan Sebaran Lamun di Desa Barugaia Kecamatan Bontomanai Kabupaten Kepulauan Selayar Rombe, Katarina Hesty; Patta, Trisnawati; Surachmat, Agus; Amiluddin, Muchtar; Arafat, Yasser; Mustafa, Mustafa; Hawati, Hawati
Jurnal Salamata Vol 6, No 2 (2024): Desember
Publisher : Politeknik Kelautan dan Perikanan Bone

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15578/salamata.v6i2.13723

Indonesia merupakan negara kepulauan dengan memiliki wilayah yang sebagian besar adalah wilayah pesisir dengan mempunyai potensi yang kaya akan keanekaragaman hayati juga sumberdaya alam pada daerah pesisir. Salah satu sumberdaya pesisir yang memberikan kontribusi yang tinggi dalam lingkungan pesisir, yakni ekosistem padang lamun. Desa Barugaia merupakan salah satu desa yang terletak di Kabupaten Kepulauan Selayar, Sulawesi Selatan, yang memiliki padang lamun yang tersebar hampir merata di wilayah perairannya. Sebagai wilayah pesisir yang masyarakatnya sebagian besar bergantung pada laut untuk sumber penghidupan, keberadaan ekosistem lamun di Desa Barugaia dapat memberikan manfaat berkelanjutan bagi ekonomi lokal, khususnya bagi sektor perikanan.Tujuan penelitian ini untuk menghitung sebaran dan luasan padang lamun di Desa Barugaiya Kepulauan Selayar. Dalam penelitian ini digunakan citra Sentinel 2A yang kemudian dilakukan proses koreksi atmosferik lalu diolah menggunakan ArcGis 10.8. Penentuan titik koordinat dilakukan menggunakan Google Earth Pro. Sentinel 2A membawa berbagai petak-resolusi tinggi imager multispektral dengan 13 band spectral. Hasil penelitian menunjukkan luas sebaran padang lamun pada Desa Barugaia adalah sebesar 37,36 ha. Dimana yang paling dominan di tumbuhi lamun adalah wilayah bagian sebelah selatan, dan yang kurang di dapati adalah wilayah bagian timur

Komposisi dan Kerapatan Jenis Alga di Taman Wisata Perairan Laut Banda di Kabupaten Maluku Tengah Rombe, Katarina Hesty; Rahman, Abdul; Mardiana, Mardiana; Rosalina, Dwi
Nekton Vol 3 No 1 (2023): March
Publisher : Politeknik Negeri Sambas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47767/nekton.v3i1.383

The purpose of this study was to identify the type of algae, calculate the composition, density, diversity index, similarity index, and dominance index, and measure water quality parameters in the waters of the Banda Sea marine tourism park in central Maluku Regency. The method used in this study is a line transect method and a quadrant frame measuring 1m x 1m. There are 3 stations used with 5 replications each. The results showed that there were three divisions of algae, namely Chlorophyta, Phaeophyta, and Rhodophyta, with details of the species obtained were Amphiroa fragilissima, Boodlea composita, Boergesenia forbesii, Cladophora, Chaetomorpha crassa., Dictyota dichotoma, Gracilaria edulispuntia, Halimeda macrophyopuntia. tuna, Padina australis, Ulva compressa, Ulva reticullata, and Valonia ventricosa. The Chorophyta division of 66% obtained the highest species composition value, the highest density was obtained by the Amphiroa fragilissima species of 0.205. In addition, the ecological index such as (1) the diversity index was in the medium category with a value range of 1.35-1.97, (2) the similarity index was included in the high category with a value range of 0.72-0.86 which indicates that the ecosystem is in a stable condition and the dominance index of the three stations shows a value close to one, namely 0.87-1 which indicates that there is a tendency for one species to dominate. The measurements of water quality parameters such as temperature, salinity, and currents show that they are optimal for algae growth.

Map of The Velocity and Direction of Ocean Currents During The East and West Monsoons of Manakarra Beach Mamuju Rosalina, Dwi; Rombe, Katarina Hesty; Sabilah, Anisa Aulia; Anisya, Ainun
Rekayasa Vol 17, No 2: Agustus, 2024
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v17i2.22560

Current characteristics, including the type of dominant current, velocity, and direction, as well as the movement of ocean currents, cause the condition of a body of water to be dynamic. The aim of the study was to calculate the current direction and determine the direction of the west and east monsoon currents at Manakarra Beach in Mamuju. This study used the ARC GIS, Aviso, and MS Excel applications to utilize secondary data. The raw data were downloaded on Aviso to obtain the u and v vectors. The data obtained from Aviso was then processed into the MS Excel application to obtain the direction and velocity of the current. After gaining the current direction and velocity, the data were then visualized in the form of direction and velocity using interpolation analysis in ARC GIS. The results of the study were in the form of current velocities in Manakarra waters in 2022 in the west monsoon (reaching the highest number of 0.876561 m/s and the lowest number of 0.06885 m/s), and in the east monsoon the current velocity reached the highest number of 0.53816 m/s and the lowest number of 0.07355 m/s. In addition, the current direction in Manakarra waters in 2022 in the west monsoon had three directions, namely from the northwest, west, southwest, and ends in the northeast. In the east monsoon, there were three current directions in Manakarra waters, namely from the east, northeast, southeast, and partly from the northwest.

Kondisi Terumbu Karang di Pulau Kapoposang Kecamatan Liukang Tuppabiring Kabupaten Pangkajene Provinsi Sulawesi Selatan Rombe, Katarina Hesty; Rosalina, Dwi; Rahmawati, Gita; Surachmat, Agus; Sabilah, Anisa Aulia; Rahman, Abdul; Hermawan, Roni
Jurnal Sumberdaya Akuatik Indopasifik Vol 7 No 4 (2023): November
Publisher : Fakultas Perikanan dan Ilmu Kelautan, Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46252/jsai-fpik-unipa.2023.Vol.7.No.4.316

Coral reefs are ecosystems in the sea formed by lime-producing marine biota, especially stony corals and calcareous algae, along with other biota that live on the ocean floor. Coral reefs are ecosystems that play an important role in coastal areas but are vulnerable to internal and external changes. The purpose of this study was to calculate the percentage of coral reef cover and assess the condition of coral reefs on the Kapoposang Island. Coral Point Count with Excel Extension (CPCE) was used to analyze coral reef data. The data used were photos of coral reefs taken using the Underwater Photo Transect (UPT) method from six observation stations scattered around Kapoposang Island. Each processed photo contained 30 randomly selected points. The results of the assessment of the condition of coral reef health at five stations showed that station 1 (one) 35.62% was in moderate condition, station 2 (two) 43% was in moderate condition, station 3 (three) 46.67% was in moderate condition, station 4 (four) 40.53% is in moderate condition, station 5 (five) 41.84% is in moderate condition and station 6 (six) 29.25% is in moderate condition. From the five data collection stations the condition of coral reefs on Kapoposang Island was in the moderate category with a percentage of 39.49%.

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