Budhi Agung Prasetyo
Program Studi Manajemen Sumberdaya Perairan, Jurusan Perikanan, Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

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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
Journal of Management of Aquatic Resources Volume 3, Nomor 1, Tahun 2014
Publisher : Departemen Sumberdaya Akuatik,Fakultas Perikanan dan Ilmu Kelautan, Universitas Diponegoro

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Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1190.097 KB) | DOI: 10.24319/jtpk.8.127-138

Abstract

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(?) 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(?) inside of gobah area had greater values than the outside gobah, significantly the difference significantly occured on all regions that Kd(?) values measured (F = 5.581 > F critical = 5.554), where each regions has different characteristics to each others. Kd(?) 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(?) 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(?) values with one optical depth can be describe as exponential equation Kd(400-700 nm) = 0.6747*exp(-0.231*1?) with the determination coefficient R2 = 0.97.
IN-SITU MEASUREMENT OF DIFFUSE ATTENUATION COEFFICIENT AND ITS RELATIONSHIP WITH WATER CONSTITUENT AND DEPTH ESTIMATION OF SHALLOW WATERS BY REMOTE SENSING TECHNIQUE Prasetyo, Budhi Agung; Siregar, Vincentius Paulus; Agus, Syamsul Bahri; Asriningrum, Wikanti
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 14, No 1 (2017)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.ijreses.2017.v14.a2682

Abstract

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.
REVIEW : BATHYMETRY MAPPING USING UNDERWATER ACOUSTIC TECHNOLOGY Lubis, Muhammad Zainuddin; Pujiyati, Sri; Prasetyo, Budhi Agung; Choanji, Tiggi
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 2 (2019): JGEET Vol 04 No 02 : June (2019)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2019.4.2.3127

Abstract

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.