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Identifikasi Borneo Vortex Terhadap Dinamika Suhu Permukaan Laut di Laut Jawa Yosafat Donni Haryanto; Shanas Septy Prayuda; Rezfiko Agdialta; Nelly Florida Riama; Agus Hartoko; Sutrisno Anggoro; Muhammad Zainuri
Jurnal Penelitian Sains Vol 22, No 3 (2020)
Publisher : Faculty of Mathtmatics and Natural Sciences

The event of Borneo Vortex is a disruption of the synoptic scale that occurs when the Asian monsoon is active. Borneo Vortex occurs because of the interaction of the Asian monsoon winds with the wind from the southeast in the northwest region of Borneo so that the vortex is formed which can increase rainfall. Related with rainfall, Sea Surface Temperature (SST) becomes one of the factors that influence it. The purpose of this study is to examine the effect of Borneo Vortex on the dynamics of Sea Surface Temperatures in the Java Sea. The impact of Borneo Vortex, SST parameter becomes dynamic and very important to influence the condition of waters in Java Sea. Data used in this research is ERA Interim ECMWF (European Center for Medium-Range Weather Forecast) Reanalysis data in the form of wind component u and v, vortisitas relative, divergence, and specific humidity. Rainfall analysis is done using daily rainfall data of 3B42RT TRMM (Tropical Rainfall Measuring Mission), while SST data uses the data of Visualize NOAA (National Oceanic and Atmospheric Administration) High Resolution Blended Analysis Data. The Sea Surface Temperature analysis was performed using Remote Sensing data from the period of December until February (DJF) 2004/05 to 2014/15. The method used is to find the composite value of each parameter at the time of Borneo Vortex event during the time of research. The results identify that the largest event of Borneo Vortex was in December. With the presence of Borneo Vortex, there is a significant change in vorticity, divergence, moisture transport, rainfall, and SST. The impact of Borneo Vortex can increase rainfall and increase SST in the Java Sea. Borneo Vortex occurred in December January February at the time of an active Asian monsoon in northwest Borneo where there is a synoptic scale disorder in the form of a massive air vortex causing an increase in rainfall and the dynamics of SST tend to rise as well.Keywords: Borneo Vortex, Java Sea, Sea Surface Temperature.

OCEAN OBSERVATION ON SST VARIABILITY AND SUBSURFACE SEA WATER TEMPERATURE OF THE NORTH PAPUA THE FATE OF EL_NINO 1997 & 2007 AND LA NINA 2002 : FIELD MEASUREMENT AND TRITON BUOY DATA Agus Hartoko
JOURNAL OF COASTAL DEVELOPMENT Vol 13, No 1 (2009): Volume 13, Number 1, Year 2009
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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The increasing need to introduce and emphasis the analysis of SST and its sub-surface layers of deepwater temperature (both horizontal and vertical) profile to analyze some oceanographic phenomenasuch as up-welling process and its relationship to its seasonal variability and spatial distribution wasinevitable. Especially to avoid the misleading interpretation of using only sea surface temperature datafor deep water fish biomass distribution analysis, etc. Field SST data of July – August 1997 wasmeasured by CTD (Conductivity-Temperature-Depth) sensors on board of RV. BARUNA JAYA IV withaccuracy of 0.01 °C. Field SST data of 2002 and 2007 was derived from TRITON Buoy data base withpermission of Jamstec-Japan. All field and TRITON buoy SST data were processed into a spatial SSTlayer using Kriging method with Er_Mapper (Licensed user) software, and overlaid on the bathymetriclayer. Average daily SST east monsoon 1997 (El Nino event) was 28.46°C, where as presumably LaNina event 2002 : the average daily SST was 29.75°C and for 2007 was : 29.83°C indicates a higher SST than both 1997 and 2002. Average daily SST of west monsoon 2007 was 29.69°C. Daily SST of 2007 east monsoon was about 0.08 - 0.5°C higher than the same season of 2002 (TRITON Buoy data).The paper analyze and revealed the fate / occurrence of up welling zone in adjacent of Halmahera islands as well as the Hot Event (HE) phenomena through the analysis based on multi-layer and subsurface horizontal of both horizontal and vertical temperature of the field measurement 1997 and 2002 and 2007 TRITON data. Spatial multi-depth-layer approach had been developed in the paper is important for the analysis of deep water large pelagic fishery such as tuna fishery and its spatial distribution pattern.

APLICATION OF CHITOSAN FOR WATER QUALITY AND MACROBENTHIC FAUNA REHABILITATION IN VANNAMEI SHRIMPS (LITOPENAEUS VANNAMEI) PONDS, NORTH COAST OF SEMARANG, CENTRAL JAVA - INDONESIA R. Ruswahyuni; Agus Hartoko; Siti Rudiyanti
JOURNAL OF COASTAL DEVELOPMENT Vol 14, No 1 (2010): Volume 14, Number 1, Year 2010
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Chitosan was widely known as natural food preservative such as noodle, meat ball, soy-tofu, wide variety offresh vegetables, fruits, meat and fish products, etc. Chitosan is a non-toxic substances, has no side effect ashuman food and was made from the shell of shrimps (Penaeidae), or swimming crabs (Portunus pelagicus).Chitosan is primarily a polysacharids, with β-1,4-2 amino-2-deoxy- β- D-glucopyranose. The biopolymerhas various noble functional characters such as anti-moth, anti-bacterial, coagulating agent for suspension,or heavy metals. This substance had been examined in the Lab of Natural Product, Diponegoro Universityand give a significant effect as bacteriostatic and bactericides for pathogenic bacteria such as Salmonela.sp;Pseudomonas, E.coli, B.subtilis, S.aureus, P.aeruginosa. In the study, liquid chitosan (200 ppm) was used asanti- harmful/ pathogenic bacteria in the brackish water pond so that can eliminate and control the bacterialor virus outbreak which so far is the main problems in the fish and shrimp culture activities. The use ofchitosan in the brackish water ponds was carried out at a semi-traditional ponds at Mangkang Kulon northSemarang coastal area. The experiment had significantly decrease the suspended solid or increase watertransparency, and the organic content ( by 5 %) of the bottom susbtrate. Increase the abundance ofimportant macro-benthic organism such as Polychaeta (7-fold) as important natural feed for the cultured fishand shrimp as well as increase the diversity index of total macro-benthic organism. Decrease the growth ofdisease vector benthic organism such as Cherithidae (Gastropods) by 24.5% . With the application ofchitosan had significantly prevent the outbreak of fish and shrimp disease and increase up to 80 % thesurvival rate of Vanamae, as well as tiger shrimp Penaeus monodon, and polkadot grouper (Cromileptes,sp)in another field application.

VERTICAL TEMPERATURE, THE FATE OF UP WELLING AND SPATIAL DISTRIBUTION OF FISH BIOMASS OF NORTH PAPUA WATERS Agus Hartoko
JOURNAL OF COASTAL DEVELOPMENT Vol 10, No 3 (2007): Volume 10, Number 3, Year 2007
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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The increasing need to introduce and highlight the analysis of deep water temperature (both horizontal and vertical) profile for up welling process and its relationship to fish biomass spatial distribution was inevitable. Especially to avoid the misleading interpretation of using only surface water temperature data for deep water fish biomass analysis.The paper analyze and revealed the fate / occurrence of up welling zone in adjacent of Halmahera islands through the analysis of both multi-layer horizontal and vertical temperature data. Further analysis on the temperature and fish biomass data revealed the close relationship of horizontal temperature pattern especially at depth of 80m with spatial distribution of total fish biomass (acoustic numeric data : in dB unit) and fish biomass (ton/mile square) with fish total-length above 30cm.

MULTI LAYER SPATIAL ANALYSIS FOR DEMERSAL SHRIMP FISHERY AND SST WARMING IN THE SEMARANG COASTAL WATERS Agus Hartoko; Pramono Wibowo
JOURNAL OF COASTAL DEVELOPMENT Vol 15, No 1 (2011): Volume 15, Number 1, Year 2011
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Semarang coastal waters is part of coastal zone at the north coast of Java that is still has their characters for coastal demersal fishery. It was known for a long time before, that Semarang coastal water is a very good fishing ground especially for some valuable demersal species, such as white shrimp (Penaeus merguiensis), (Metapeneus.sp); flat fishes (3 species); Gastropods : Tiger snails (Babylonia.sp) and Bivalves : Anadara.sp. Some study that had been developed earlier in transforming from individual station data at coastal and seas, into visual-spatial layer in order to give more accurate spatial analysis of multiple parameters in the invisible coastal waters. This study present further development in the analysis of multi-layer spatial analysis. The samples of demersal coastal shrimp fishery and its closely related ecosystem parameters (depth; sediment; salinity) were taken randomly to represent the area of Semarang coastal zone. Field ecosystem and fishery samples data then processed using spatial method known as Kriging, and overlaid on a Landsat_TM satellite data. The study develops especially a multi layer of the field variables approach in order to analyze possible spatial multiple correlations between ecosystem parameter, such as type of bottom sediment, depth, and salinity to spatial distribution of shrimps spatial distribution as to represent demersal coastal fishery. This benthic fishery resources is regarded as the most vulnerable fishery due it’s sensitive character ie. sedentary and limited movement, is a good example to be used to monitor the impact of the environmental changes such global warming and climate change, such as seawater temperature anomaly in Semarang Coastal water (was found 1.39 ºC in March 1983) for the adaptation strategy in the future coastal resources management.

SPATIAL DISTRIBUTION OF Thunnus.sp, VERTICAL AND HORIZONTAL SUB-SURFACE MULTILAYER TEMPERATURE PROFILES OF IN-SITU AGRO FLOAT DATA IN INDIAN OCEAN Agus Hartoko
JOURNAL OF COASTAL DEVELOPMENT Vol 14, No 1 (2010): Volume 14, Number 1, Year 2010
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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The study was the first ever attempt in fisheries oceanography sciences to explore the empiric correlationbetween the spatial distribution of tuna (Thunnus.sp) and sub-surface in-situ temperature data. By means ofoptimalization and use of an in-situ data of both vertical and horizontal which will be processed into amultilayer subsurface seawater temperature of ARGO Float in Indian ocean. So far only sea surfacetemperature (with temperature around 29 °C) data were used to look for the correlation for tuna spatialdistribution, while the Thunnus.sp swimming layer as widely known is in about 80 – 250m depth withseawater temperature between 15 – 23 °C. The noble character of ARGO Float data is as in-situ datarecorded directly by the sensors, transmitted to the satellite, transmitted to the ground station and ready to beused by researcher all over the world.In the study, about 216 seawater temperature coordinates of ARGOFloat and actual tuna catch data in the same day were used to represent the dry season (April – November2007) analysis, and about 90 data were used for the rainy season (December – March 2007). The actualtuna catch and its coordinates data were collected with permission from PT. Perikanan Samudra Besar,(PT.PSB) Benoa – Bali Indonesia. Then both seawater temperature and tuna data were processed using aKrigging method or spatial interpolation method.Based on a monthly actual tuna production by fishing fleetof PT.PSB operated in Indian Ocean indicates that there were two cycles of low catch in March and July andhigh catch in May and December 2007. In general, seawater temperature in depth of 80m, 100m, 150m and200m of the dry season was 2 °C warmer than those of the rainy season. Range of seawater temperature willdecrease due to the water depth, range of seawater temperature at depth of 150m was between 14 – 22 °Cand at depth of 200m between 12 – 20 °C. Based on the regression and correlation between tuna catch andseawater temperature revealed that seawater temperature at depth 150m has the highest coefficient ofcorrelation than to the seawater temperature at depth 100m and 200m.

Aplikasi Teknologi Geomatika untuk Pemetaan Penurunan Tanah (Land Subsidence) di Pesisir Kota Semarang Agus Hartoko; Anindya Wirasatria; Muhammad Helmi; Bhaskoro Rochaddi
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 13, No 1 (2008): Jurnal Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Beberapa fenomena alam di kawasan pesisir dan kemudian menjadi bencana alam yang terjadi dalam kehidupan sehari hari diantaranya banjir, rob, longsor, gunung meletus, tsunami dan yang terjadi di Kota Semarang khususnya, adalah penurunan tanah (land-subsidence). Penelitian diiakukan dengan melakukan pengukuran perubahan ketinggian tanah berdasarkan 60 Titik Tinggi Geodesi (TTG-Bakosurtanal) maupun Bench Mark (BM) yang ada dikota Semarang dan data posisi koordinat masing-masing dengan GPS (Global Positioning System). Data geodetik yang diperoleh di transformasi menjadi data numerik, dan proses analisa geo-statistik diiakukan dengan metoda Kriging memakai perangkat lunak ER_Mapper 6.4 (Licensed user) dan Arc_GIS. Di samping data hasil pengukuran dilapangan, digunakan juga data Spaceshuttle Radar for Terrain Model (SRTM) untuk membentuk citra kontur 3 dimensi, juga menggunakan data citra Landsat_ETM. Berdasarkan data pengukuran yang diiakukan di lapangan dan rangkaian analisis spasial maka dapat dibuat plot laju penurunan tanah dan diketahui bahwa laju penurunan tanah Kota Semarang berkisar antara 1-9 cm/tahun, sehingga memerlukan pemetaan ulang, evaluasi tata ruang dan peraturan daerahKata kunci: penurunan tanah, kawasan pesisir, geo-statistik

Analisis Respon Spektral dan Ekstraksi Nilai Spektral Terumbu Karang Pada Citra Digital Multispektral Satelit ALOS-AVNIR di Perairan Gugus Pulau Pari, Kepulauan Seribu, Jakarta. Muhammad Helmi; Agus Hartoko; Herkiki S; Munasik Munasik; S Wouthuyzen
Buletin Oseanografi Marina Vol 1, No 1 (2011): Buletin Oseanografi Marina
Publisher : Universitas Diponegoro

Abstract Coral reef and other coastal ecosystem map are very important spatial data to provide for many coastal management and planning purposes in Indonesia. Pari Islets of Thousand Islands in the northern coast of Jakarta has great variation on complex coastal ecosystem, such as beach forest, mangrove, coral reefs and seagrass. These rather large shallow and clear water islets could be ideal for satellite image spectral-respond study. The study aimed to asses spectral respond and spectral value of coral reef extraction on ALOS-AVNIR multispectral-satellite image in Pari Islets of Thousand Islands, Jakarta. THSI 4-band multispectral satellite image dated 30 April 2008 (JAXA, 2008) with 10 m spatial resolution. Ground survey was conducted in 85 sampling points between June-July 2009. A set of image processing method including geometric correction, atmospheric calibration (enhanced dark pixel correction), water column correction, Lyzenga transform, Hue Saturation Intensity (HSI) transform, Principle Component 1, scattergram analysis, spectral comparison, was applied for the multispectral image analysis, accompanied by a Line Intercept Transect (LIT) and Manta-taw field survey for the coral reef study. The result showed that coral reef covers area in Pari islets were 249.9 ha (26.5%), seagrass 313.6 ha (33.3%) and shallow water sand 378.9 ha (40.2%). Spectral characteristic of green and red band were much better on differentiating between coral reef and other shallow water substrate compared to the other bands. Visually coral reef identification on HSI transformed image much easier compared to on Lyzenga transformed image. The map accuracy on HSI (88.1%) also higher than Lyzenga (77.3%). Spectral values of coral reef on scattergram were clumped only on specific location and easily differentiated from other shallow water substrates, and so coral reef patch on ALOS-AVNIR satellite image could be extracted directly from the scattergram. Key Word: Spectral respond, Coral reef, ALOS-AVNIR, Multispectral

ANALISIS MONSUN DI LAUT JAWA Yosafat Donni Haryanto; Rezfiko Agdialta; Agus Hartoko
Berkala Perikanan Terubuk Vol 48, No 2 (2020): Juli 2020
Publisher : Fakultas Perikanan dan Kelautan, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/terubuk.48.2.492-500

Monsoon is one of the important atmospheric circulations of the global climate system, monsoon activity has a major influence on weather formation in the region in its path. Monsoon activity is often associated with the presence of synoptic disorders in the area in its path. Synoptic disorders involving the movement of rain slowed throughout the monsoon region. The monsoon pits on an annual cycle related to climate when dry and wet. During the dry season, winters occur on various continents with a mass of air in the atmosphere which results in cold and dry, while when it is wet, it affects the summer with moist air. The Java Sea is an area of 310,000 Km2 which is located only 220 miles from the island of Borneo and the north coast of Java covers the archipelago. The geographical position of the Java Sea is in the area where the interaction is occurring - the atmosphere in the Java Sea is becoming more dynamic. Research Objectives to analyze the influence of rainfall in the Java Sea spatially and temporally. The data used are wind re-analysis of zone and meridional data (ftp.cdc.noaa.gov/ Data set /) from 1986 to 2017, for rainfall data at Tegal, Semarang and Surabaya Meteorological Stations 1986-2017. Spatial and temporal monsoon wind patterns are more dominant and beneficial to the variability of rainfall in the Java Sea. This condition can be seen in the type of monsoonal rain letter U or V with one peak of rain in December January and February (DJF) with the beginning of the rainy season in December in June July August (JJA) peak of the dry season and dry season beginning in June.

KAJIAN PERUBAHAN SPASIAL GARIS PANTAI SEBAGAI ZONASI TATA RUANG PESISIR (STUDI KASUS PESISIR KABUPATEN KENDAL) Tjaturahono Budi Sanjoto; Sutrisno Anggoro; Agus Hartoko
TATALOKA Vol 14, No 1 (2012): Volume 14 Number 1, February 2012
Publisher : Diponegoro University

The purposes of this research are to analyze the pattern of coastal spatial changes in Kendal Regency from 1910 to 2009, and to formulate coastal area zoning plan based on spatial changes. The Method of analysed was with overlay technique. Research results show that the coastal spatial changes of produced 5 (five) patterns of coastline changes: (1) coastline spatial change with abrasion pattern, (2) coastline spatial change with accretion pattern, (3) coastline spatial change with accretion pattern folllowed by abrasion, (4) coastline spatial change with accretion pattern then stable, (5) coastline spatial change with stagnant pattern. These spatial changes also altered the shape of Bodri Delta from Cuspate to Lobate. These changes also indicate the alter of geomorphic energy from being destructive to being constructive. Additionally, the research also produced a new product in the form of a map of Kendal District coastal layout zoning.

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