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SEBARAN SPASIAL CUMI-CUMI (Loligo Spp.) DENGAN VARIABEL SUHU PERMUKAAN LAUT DAN KLOROFIL-a DATA SATELIT MODIS AQUA DI SELAT KARIMATA HINGGA LAUT JAWA Prasetyo, Budhi Agung; Hartoko, Agus; Hutabarat, Sahala
Management of Aquatic Resources Journal (MAQUARES) Volume 3, Nomor 1, Tahun 2014
Publisher : Departemen Sumberdaya Akuatik,Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (962.907 KB)

Dengan mengetahui area dimana ikan bisa tertangkap dalam jumlah yang besar, kegiatan penangkapan menjadi lebih efektif. Tujuan penelitian adalah mengetahui sebaran spasial cumi-cumi per-musim pada tahun 2011 hingga 2012, mengetahui sebaran spasial parameter oseanografiÂ dan mengetahui korelasi antara parameter oseanografi dengan sebaran spasial cumi-cumi. Data yang digunakan adalah data suhu permukaan laut dan klorofil-a dari satelit MODIS Aqua dan data sekunder lapangan yaitu data hasil tangkapan cumi-cumi. Hasil dari penelitian ini menunjukkan bahwa hasil tangkapan cumi-cumi pada tahun 2011 - 2012 lebih banyak tertangkap pada musim peralihan II hingga musim barat (September-Desember) dengan nilai rata-rata hasil tangkapan setiap tahun sebesar 88 Ton dan 189 Ton. Sebaran penangkapan cumi-cumi banyak terjadi di bagian barat Laut Jawa hingga Selat Karimata. Sebaran suhu permukaan laut pada tahun 2011 musim barat lebih tinggi (24,8 - 32,1oC) dibandingkan musim timurÂ (24,2 - 29,4oC), dan pada tahun 2012 juga musim barat lebih tinggi (20,3 - 33,4oC) dibandingkan musim timur (24,8 - 30,1oC). Sebaran Klorofil-aÂ tahun 2011 musim timur lebih tinggi (0,282 - 0,459 mg/L) dibandingkan musim barat (0,304 - 0,452 mg/L), dan pada tahun 2012 juga menunjukkan sebaran klorofil-a musim timur lebih tinggi (0,352 - 0,464 mg/L) dibandingkan musim barat (0,273 - 0,458 mg/L). Analisa regresi tunggal menunjukkan nilai koefisien regresi dari distribusi klorofil-a setiap tahun (r = 0,521 - 0,446) masih memiliki hubungan dengan hasil tangkapan cumi-cumi daripada suhu permukaan laut (r = 0.221 - 0,358).Â Analisa regresi ganda menunjukkan nilai (r) antara sebaran suhu permukaan laut dan sebaran klorofil-a pada musim timur sebesar r = 0,253 dan pada musim barat sebesar r = 0,416 menunjukkan bahwa musim barat memiliki hubungan yang lebih tinggi dibandingkan dengan musim timur. Hubungan tersebut karena cumi-cumi yang hidup di perairan sekitar Laut Jawa dan sekitarnya tersebar karena pengaruh arus balik musiman dari angin muson yang terjadi di antara Samudera Pasifik dan Samudera Hindia. Sebaran oseanografi hanya berpengaruh langsung terhadap beberapa spesies cumi-cumi.

Review : Bathymetry Mapping Using Underwater Acoustic Technology Muhammad Zainuddin Lubis; Sri Pujiyati; Budhi Agung Prasetyo; Tiggi Choanji
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 2 (2019): JGEET Vol 04 No 02 : June (2019)
Publisher : UIR PRESS

The bathymetry mapping using underwater acoustic technology very important in Indonesia waters. Bathymetry is the result of measuring the height of the seabed so that the bathymetric map provides information about the seabed, where this information can provide benefits to several fields related to the seabed. In bathymetry mapping uses underwater acoustic technology where among them is using Single beam echosounder and MBES (Multibeam Echosounder System), and multibeam echosounder (MBES) is acoustic equipment that is intensively used frequently in basic waters mapping. The advantage of using underwater acoustic technology is the acquisition and processing of data in real time, high accuracy and precision (correction of the bathymetry data was carried out with reference to the 2008 International Hydrographic Organization (IHO), and cannot be a threat or damage to objects. Retrieval of bathymetry data must use parallel patterns, namely: patterns with perpendicular sounding directions and tend to be parallel to longitudinal lines or in accordance with parallel sounding patterns.

PENGUKURAN KOEFISIEN DIFFUSE ATENUASI (Kd) DI PERAIRAN DANGKAL SEKITAR KARANG LEBAR, KEPULAUAN SERIBU, DKI JAKARTA Budhi Agung Prasetyo; Vincentius Paulus Siregar; Syamsul Bahri Agus; Wikanti Asriningrum
Jurnal Teknologi Perikanan dan Kelautan Vol 8 No 2 (2017): NOVEMBER 2017
Publisher : Fakultas Perikanan dan Ilmu Kelautan

Diffuse attenuation coefficient from downwelling irradiance measurement is one of the important oceanography parameter that provide information on light availability and the light penetration through waters column that represent the waters clarity, photosynthesis and other biological processes. Information about diffuse attenuation coefficient play an important role on the development of bio-optical algorithm on Ocean Color satellite data. The aim of this research is to know the variability of diffuse attenuation coefficient in the shallow water of Karang Lebar, Air and Panggang island using irradiance sensor from hyperspectral radiometer TriOS-RAMSES covering a wavelength range from 320 to 950 nm with 3.3 nm spectral resolution. In situ measurments performed by pull down the irradiance sensor on each depth vertically in waters column up to just before the sea floor. Overall, the measurement result showed that values of Kd(Î») had patterns tends to be decreased on blue-green region wavelength (380-480 nm) and increased again on green-red region (560-760 nm). We found that values of Kd(Î») inside of gobah area had greater values than the outside gobah, significantly the difference significantly occured on all regions that Kd(Î») values measured (F = 5.581 > F critical = 5.554), where each regions has different characteristics to each others. Kd(Î») values dominantly affected by absorbtion of chlorophyll-a with determination cofficient R2 = 0.808 compared with backscattering by suspended solid with determination coefficient R2 = 0.043. Kd(Î») values on visible wavelength regions (400-700 nm) can describe information about how far light can be detected by Ocean Color satellite from water column represented by one optical depth. Relationship of Kd(Î») values with one optical depth can be describe as exponential equation Kd(400-700 nm) = 0.6747*exp(-0.231*1Î¶) with the determination coefficient R2 = 0.97.

Data Integration Through WebGIS to Inform Spatial Status of Coral Reefs in Lampung Province, Indonesia Adib Mustofa; Budhi Agung Prasetyo
Journal of Applied Geospatial Information Vol 4 No 2 (2020): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v4i2.2148

Data integration of structured ecosystem monitoring is crucial to support decision making for better marine ecosystem management. Coral reef monitoring data had been carried out in several separated studies in Lampung Province. However, lacks data integration among scientists and institutions making them inefficient as a basis of science for ecosystem management and decision making. This study was aimed to integrate available coral reef data in the last 15 years in Lampung Province and inform the spatial status of coral reef cover through WebGIS. Secondary data of coral reef study in the last 15 years were acquired from published articles and online-available-institutional reports. Data were then converted to digital mode prior to publishing them in the form of a website database through WebGIS. Results suggested that there were four main areas of coral reef studies in Lampung Province, namely Lampung bay, Krakatau, Bakauheni, and Lampung west coast. One-way ANOVA analysis of the last 5-year coral data shown there were no spatial differences on coral cover the four areas. Coral cover in Lampung west coast was generally in good shape at 56.13±1.74% and was higher compared to those in Lampung bay, Bakauheni, dan Krakatau regions, at 46.57±2.23%, 36.48±1.58%, and 35.6±3.69%, respectively. All coral data was published through WebGIS at https://sll.itera.ac.id/research/webgis . It is recommended this WebGIS could serve as a reference to conduct long-term coral reef monitoring in Lampung since it provides coordinates and coral reef status as baseline data for further analysis of coral reefs ecosystem.

Development of Kd(490) Algorithm Using Medium Spatial Resolution Landsat 8 OLI Arround Shallow Waters In Panggang Island Budhi Agung Prasetyo; Wikanti Asriningrum; Vincentius Paulus Siregar
Journal of Applied Geospatial Information Vol 5 No 1 (2021): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v5i1.2773

The state of water quality around Panggang Island, Seribu Islands, in recent decades experienced degradation caused by human activities. The parameters of the diffuse attenuation coefficient (Kd) is an important optical property-related attenuation of light in the water column, and its brightness. Landsat 8 data has potential to map the value of Kd(490) in regional waters in Indonesia. Landsat 8 data could provide solutions to spatial data availability of Kd(490) values in addition to Ocean Color data. The purposes of this research was to developed empirical algorithm of Landsat 8 data to derive values of Kd(490) that can be use as tools for monitoring water quality optically on a regional scale which could not be done by Ocean Color data that has spatial resolution limitation. In-situ measurement of radiometric data was done by using TriOS-RAMSES hyperspectral spectroradiometer with a range of 320 – 890 nm and spectral sampling of 3.3 nm on shallow-waters around Panggang Island. The development of Kd(490) algortihm was done by simulation on ratio of Green and Near-infrared band has great determination values with Kd(490) empirically, which that empirical algorithm can be applied on Landsat 8 data to derive its values. In addition, it is noted that the shallow-waters around Panggang Island, dominant affected by absorption of chlorophyll-a rather than scattering by suspended solids.

IN-SITU MEASUREMENT OF DIFFUSE ATTENUATION COEFFICIENT AND ITS RELATIONSHIP WITH WATER CONSTITUENT AND DEPTH ESTIMATION OF SHALLOW WATERS BY REMOTE SENSING TECHNIQUE Budhi Agung Prasetyo; Vincentius Paulus Siregar; Syamsul Bahri Agus; Wikanti Asriningrum
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 14, No 1 (2017)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Diffuse attenuation coefficient, Kd(λ), has an empirical relationship with water depth, thus potentially to be used to estimate the depth of the water based on the light penetration in the water column. The aim of this research is to assess the relationship of diffuse attenuation coefficient with the water constituent and its relationship to estimate the depth of shallow waters of Air Island, Panggang Island and Karang Lebar lagoons and to compare the result of depth estimation from Kd model and derived from Landsat 8 imagery. The measurement of Kd(λ) was carried out using hyperspectral spectroradiometer TriOS-RAMSES with range 320 – 950 nm. The relationship between measurement Kd(λ) on study site with the water constituent was the occurrence of absorption by chlorophyll-a concentration at the blue and green spectral wavelength. Depth estimation using band ratio from Kd(λ) occurred at 442,96 nm and 654,59 nm, which had better relationship with the depth from in-situ measurement compared to the estimation based on Landsat 8 band ratio. Depth estimated based on Kd(λ) ratio and in-situ measurement are not significantly different statistically. Depth estimated based on Kd(λ) ratio and in-situ measurement are not significantly different statistically. However, depth estimation based on Kd(λ) ratio was inconsistent due to the bottom albedo reflection because the Kd(λ) measurement was carried out in shallow waters. Estimation of water depth based on Kd(λ) ratio had better results compared to the Landsat 8 band ratio.

Efektifitas Identifikasi Perubahan Tutupan Mangrove Menggunakan Citra Landsat-8 di Kecamatan Labuhan Maringgai, Lampung Timur Pratama, Annisa Tias; Prasetio, Wiji; Prasetyo, Budhi Agung
J SIG (Jurnal Sains Informasi Geografi) Vol 8, No 1 (2025): Edisi Mei
Publisher : Universitas Muhammadiyah Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31314/jsig.v8i1.3067

Mangrove forests play a crucial role in protecting coastlines, reducing CO2, and serving as natural resources. However, the growth of mangroves continues to decline due to human activities, necessitating studies to monitor mangrove coverage both directly and indirectly. This research aims to assess the effectiveness of identifying changes in mangrove coverage in Labuhan Maringgai District, East Lampung. The data used is Landsat-8 satellite imagery from the years 2019-2023. The method employed involves NDVI (Normalized Difference Vegetation Index) and EVI (Enhanced Vegetation Index) algorithms followed by random forest classification to determine mangrove and non-mangrove areas. Accuracy testing uses a confusion matrix with overall accuracy values and Kappa coefficient. In addition, the t-test was used to determine the effectiveness between the NDVI and EVI algorithms. The analysis results indicate a change in the area of mangrove coverage with annual increases in Labuhan Maringgai District. Sequentially from 2019 to 2023, using the NDVI algorithm showed values of 19%, 6%, 13%, and 7%, while the EVI algorithm showed values of 25%, 5%, 11%, and 8%. The accuracy test results produced have the highest average effectiveness in the NDVI algorithm with an overall accuracy of 95.4% and a Kappa coefficient of 0.87 compared to the EVI algorithm with an overall accuracy of 91.4% and a Kappa coefficient of 0.82. On the other hand t-test results indicate that utilize of the NDVI algorithm is more effective than EVI, with the correction value for the NDVI algorithm being 0.0077 compared to the correction value for the EVI algorithm being 0.1664.

Monitoring Kualitas Air Laut di Lokasi Budidaya Rumput Laut Eucheuma cottonii Pulau Kongsi (Studi Kasus: Musim Barat) Sihite, Pungka Star; Prasetyo, Budhi Agung; Muklis, Nur’Ainun; Syari , Chalida
Jurnal Riset Kelautan Tropis (Journal Of Tropical Marine Research) (J-Tropimar) Vol 7 No 1 (2025): April
Publisher : Universitas Hang Tuah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30649/jrkt.v7i1.115

Kualitas air laut merupakan faktor penting dalam budidaya perikanan, karena dapat mempengaruhi kesehatan dan pertumbuhan rumput laut. Penelitian ini bertujuan untuk mengevaluasi kualitas air di lokasi budidaya rumput laut Eucheuma Cottonii Pulau Kongsi, Kepulauan Seribu. Parameter kualitas air laut diantaranya pH, suhu, oksigen terlarut (DO), salinitas air laut, kedalaman lokasi budidaya, kecerahan serta kecepatan arus permukaan, diukur untuk menentukan kondisi kualitas air. Pengambilan sampel dilakukan secara in situ. Metode analisis deskriptif komparatif digunakan untuk membandingkan baku mutu kualitas air laut yang ditetapkan oleh peraturan pemerintah dengan hasil pengujian, juga hasil dari penelitian peneliti terdahulu. Hasil analisis menunjukkan bahwa kualitas air yang diukur di lokasi budidaya berada dalam kisaran yang optimal untuk budidaya rumput laut Eucheuma cottonii namun pada parameter kecepatan arus kurang sesuai. Parameter kualitas air diukur pada tiga lokasi budidaya rumput laut Eucheuma cottonii. Rata-rata hasil pengukuran pada ketiga stasiun budidaya adalah sebagai berikut: suhu perairan 29,54 °C, salinitas 33,16 ppt, pH 7,33, oksigen terlarut (DO) 9,76 mg/L, kedalaman 3,67 meter, kecerahan 100%, dan kecepatan arus 0,0776 m/s. Berdasarkan data tersebut, kualitas air pada lokasi budidaya rumput laut Eucheuma cottonii dinyatakan baik.

The Cellulase Enzyme Activity of Thermophilic Bacteria from Way Belerang Hot Spring, Lampung Hidayah, Rismawati; Suryanti, Erma; Asagabaldan, Meezan Ardhanu; Prasetyo, Budhi Agung
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS Vol 11, No 3: Jurnal Pembelajaran Dan Biologi Nukleus September 2025
Publisher : Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v11i3.7493

Background: The demand for cellulase enzymes across various industries continues to rise, while most of the current supply still depends on imports. Therefore, exploring local biological resources, such as thermophilic bacteria capable of producing cellulase, is crucial. This study aims to isolate and evaluate the cellulase enzyme activity of thermophilic bacteria from the Way Belerang Hot Spring in South Lampung, Indonesia. Methodology: The research involved isolating bacteria from hot spring water samples, conducting qualitative and quantitative assays of cellulase activity, and characterizing the isolates. Findings: A total of 24 bacterial isolates were obtained, 16 of which demonstrated cellulolytic activity, as indicated by clear zones on 1% CMC agar. The two most promising isolates, S5.1 and S5.24, exhibited the highest cellulolytic indices of 2.728 and 2.395, respectively. These isolates were further tested quantitatively using a glucose standard curve to determine their enzyme activity. The highest cellulase activity for isolate S5.1 was recorded at the 10th hour with 5.1 × 10⁻² U/mL, while isolate S5.24 showed peak activity at the 14th hour with 3.1 × 10⁻² U/mL. Contribution: This study represents the first investigation of thermophilic amylase-producing bacteria from the Way Belerang Hot Spring, highlighting the potential of thermostable amylase enzymes that can withstand high temperatures for future industrial applications.

Monitoring Kualitas Air Laut di Lokasi Budidaya Rumput Laut Eucheuma cottonii Pulau Kongsi (Studi Kasus: Musim Barat) Sihite, Pungka Star; Prasetyo, Budhi Agung; Muklis, Nur’Ainun; Syari , Chalida
Jurnal Riset Kelautan Tropis (Journal Of Tropical Marine Research) (J-Tropimar) Vol 7 No 1 (2025): April
Publisher : Universitas Hang Tuah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30649/jrkt.v7i1.115

Kualitas air laut merupakan faktor penting dalam budidaya perikanan, karena dapat mempengaruhi kesehatan dan pertumbuhan rumput laut. Penelitian ini bertujuan untuk mengevaluasi kualitas air di lokasi budidaya rumput laut Eucheuma Cottonii Pulau Kongsi, Kepulauan Seribu. Parameter kualitas air laut diantaranya pH, suhu, oksigen terlarut (DO), salinitas air laut, kedalaman lokasi budidaya, kecerahan serta kecepatan arus permukaan, diukur untuk menentukan kondisi kualitas air. Pengambilan sampel dilakukan secara in situ. Metode analisis deskriptif komparatif digunakan untuk membandingkan baku mutu kualitas air laut yang ditetapkan oleh peraturan pemerintah dengan hasil pengujian, juga hasil dari penelitian peneliti terdahulu. Hasil analisis menunjukkan bahwa kualitas air yang diukur di lokasi budidaya berada dalam kisaran yang optimal untuk budidaya rumput laut Eucheuma cottonii namun pada parameter kecepatan arus kurang sesuai. Parameter kualitas air diukur pada tiga lokasi budidaya rumput laut Eucheuma cottonii. Rata-rata hasil pengukuran pada ketiga stasiun budidaya adalah sebagai berikut: suhu perairan 29,54 °C, salinitas 33,16 ppt, pH 7,33, oksigen terlarut (DO) 9,76 mg/L, kedalaman 3,67 meter, kecerahan 100%, dan kecepatan arus 0,0776 m/s. Berdasarkan data tersebut, kualitas air pada lokasi budidaya rumput laut Eucheuma cottonii dinyatakan baik.

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