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Hadikusumah Hadikusumah
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INCREASE OF THE THERMOCLINE LAYER DUE TO TSUNAMI 2004 IN NANGRO ACEH DARUSSALAM WATERS Hadikusumah Hadikusumah; J. D. Lekalete
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 3 No. 1 (2011): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1871.903 KB) | DOI: 10.29244/jitkt.v3i1.7840

Abstract

Research of physical oceanographic conditions post-tsunami was carried out and subsequently compared with the pre-tsunami 1998. Measurement of suhu, salinity and light transmission was conducted by CTDSBE911pls Model. Results showed that the flow in the Straits of Malacca flowed into the northwest and turned back into the Strait of Bengal and the next rotation into the flow of waters along the west coast of Nangro Aceh Darusalam (NAD). The mainstream off coast NAD in the Indian Ocean flowed to the northwest. Upper thermocline layer (17 m to 50 m) moved upward in 2005 and 2006 compared with previous data 1998 (90 m to 125 m). The moving upward thermocline in 2006 was allegedly due to the influence of Indian Ocean Dipole (IOD) positive. This requires further verification through long-term data collection to determine the monthly and annual variations, which will be compared with previous research. Light transmission (Tx) in 2005 from the surface to near the bottom (water column) was found lower than the year 1998 and 2006. This result was allegedly caused by resuspension from the seabed by energy turbulent produced by the tsunami. Heat content between 5 to 65 m depth in 2005 was higher than in 1998 and 2006. The higher heat content during the year of 2005 (post tsunami) was caused by friction due to the influence of tsunami energy, which predominantly found in the mixed layer depth. Type of water masses in the study area was a mixing between the local water mass, Malacca Strait Water (MSA), Bay of Bengal Water (BBW) under the influence of Arab Waters (AW), and the Indian Deep Water (IDW).Keywords: current, thermocline, heat content, watermass type, and Nangro Aceh Darusalam
SUBTROPICAL WATER MASSES IN HALMAHERA WATERS Hadikusumah Hadikusumah
Jurnal Ilmu dan Teknologi Kelautan Tropis Vol. 2 No. 2 (2010): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Department of Marine Science and Technology, Faculty of Fisheries and Marine Science, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1243.612 KB) | DOI: 10.29244/jitkt.v2i2.7857

Abstract

Research of water masses by using conductivity temperature depth (CTD), are conducted in the eastern path of the Indonesia Throughflow (ITF) in the Halmahera, Seram and Banda seas during March-April 2007 under the Expedition of Widya Nusantara (EWIN). The objective of this research is to see maximum salinity spread of South Pacific Subtropical Water (SPSW) water masses enter the eastern Indonesia Waters. The temperature and salinity profiles show the presence of the presence of SPSW have been very much confined to the Halmahera Sea only. Little of this water masses have been detected in the eastern Seram Sea, but none in Banda Sea. Early data of Arlindo Mixing (ARMIX) experiment in southeast monsoon 1993 indicated that this water masses SPSW may entered the southern most part of the Moluccas Sea. Type of South Pacific Subtropical Water (SPSW) water masses appears in the Halmahera Sea at an average depth of 200m and the dominant flows between Halmahera and Obi Islands (Moluccas Sea continues to the east). Type of South Pacific Intermediate Water (SPIW) water mass appeared on average Halmahera Sea at a depth of 750m and the dominant flows between Halmahera and Obi Islands (Moluccas Sea continues to the east). Type of North Pacific Subtropical Water (NPSW) water masses at an average depth of ~ 150m found in the northern part of Halmahera, the dominant flow to the Celebes Sea, Makassar Strait, Flores Sea and partly flows into Lombok Straits. Type of minimum salinity water mass of North Pacific Intermediate Water (NPIW) obtained at an average depth of ~ 400m dominant flow towards the Celebes Sea, Makassar Strait and Flores Sea.Keywords: maximum salinity, SPSW, Halmahera, Seram, and Banda Seas
VARIABILITAS SUHU DAN SALINITAS DI PERAIRAN CISADANE Hadikusumah, Hadikusumah
Makara Journal of Science Vol. 12, No. 2
Publisher : UI Scholars Hub

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Abstract

The Temperature and Salinity Variabilities at Cisadane Estuary. The study was conducted at Cisadane Estuary at 18 oceanographic station in Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II from 2003 to 2005. The area of the study was located at the longitude of 106.58° - 106.70° E and the latitude of 5.96° - 6.02°S. The measurements of temperature, salinity, tubidity and light transmision used CTD (Conductivity, Temperature and Depth) Model SBE-19. The result shows that the temperature and salinity vertical profil variabilities at Cisadane Estuary underwent a change in the influence of Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II, for example it was obtained the leg time of the maximum salinity of Transition Monsoon Season II as the same as that of East Monsoon Season. Based on the horizontal and vertical distribution pattern analysis of the interaction between low salinity fresh water of Cisadane River and high salinity sea water of Java Sea, it was also influenced by the season variability and tide. The surface layer was much more influenced by the low salinity and the heat of sunray (seasonal variability) with the weaker intensity to the lower layer. The change of the heat energy by the increase of seasonal temperature occurred in September 2003 to May 2004 ((∆E = 600.6 ⋅ 105 Joule), July to November 2005 (∆E = 84.9 Joule). The decrease of the heat energy occurred in June to September 2003 ((-267.6 ⋅ 105 ), May ke October 2004 (∆E = 189.3 ⋅ 105 Joule) and October 2004 to July 2005 (∆E = -215.4 ⋅ 105 Joule).
VARIABILITAS SUHU DAN SALINITAS DI PERAIRAN CISADANE Hadikusumah, Hadikusumah
Makara Journal of Science Vol. 11, No. 2
Publisher : UI Scholars Hub

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Abstract

The Temperature and Salinity Variabilities at Cisadane Estuary. The study was conducted at Cisadane Estuary at 18 oceanographic station in Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II from 2003 to 2005. The area of the study was located at the longitude of 106.58° - 106.70° E and the latitude of 5.96° - 6.02°S. The measurements of temperature, salinity, tubidity and light transmision used CTD (Conductivity, Temperature and Depth) Model SBE-19. The result shows that the temperature and salinity vertical profil variabilities at Cisadane Estuary underwent a change in the influence of Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II, for example it was obtained the leg time of the maximum salinity of Transition Monsoon Season II as the same as that of East Monsoon Season. Based on the horizontal and vertical distribution pattern analysis of the interaction between low salinity fresh water of Cisadane River and high salinity sea water of Java Sea, it was also influenced by the season variability and tide. The surface layer was much more influenced by the low salinity and the heat of sunray (seasonal variability) with the weaker intensity to the lower layer. The change of the heat energy by the increase of seasonal temperature occurred in September 2003 to May 2004 ((∆E = 600.6 ⋅ 105 Joule), July to November 2005 (∆E = 84.9 Joule). The decrease of the heat energy occurred in June to September 2003 ((-267.6 ⋅ 105 ), May ke October 2004 (∆E = 189.3 ⋅ 105 Joule) and October 2004 to July 2005 (∆E = -215.4 ⋅ 105 Joule).
BOX MODEL AIR TAWAR, SALINITAS DAN ZAT HARA DI DELTA MAHAKAM KALIMANTAN TIMUR Hadikusumah, Hadikusumah; Simanjuntak, Marojahan
Makara Journal of Science Vol. 15, No. 1
Publisher : UI Scholars Hub

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Abstract

Box Model of Freshwater, Salinity and Nutrient in the Delta Mahakam East Kalimantan. Research has been conducted in the southern part of the Mahakam Delta, East Kalimantan. Method of measuring temperature, salinity, light transmission and turbidity by using CTD model 603 SBE and current measurement and bathymetry by using ADCP model RDI. Measurement parameters on the nutrient chemistry are based of water samples taken using Nansen bottles from two depths. The purpose of this study to determine the mechanism of freshwater, salinity and nutrient transport from the land of the Mahakam River which interact with seawater by using box models. The results illustrate that the vertical distribution of salinity in the Mahakam Delta has obtained a high stratification, where the freshwater salinity 12.30 psu at the surface of a river flowing toward the sea, and seawater of high salinity 30.07 psu flowing in the direction river under the surface that are separated by a layer of mixture. Freshwater budget of the sea (VSurf) obtained for 0,0306 x 109 m3 day-1, and the sea water salinity budget is going into the bottom layer system (VDeep.SOcn-d) obtained for 20,727 x 109 psu day-1. While time dilution (τSyst) obtained for 0.245 day-1 or 5.87 hours. Nutrient budget in the surface layer obtained by the system is autotrophic while in layers near the bottom tend to be heterotrophic.
VARIABILITAS SUHU DAN SALINITAS DI PERAIRAN CISADANE Hadikusumah, Hadikusumah
Makara Journal of Science Vol. 12, No. 2
Publisher : UI Scholars Hub

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Abstract

The Temperature and Salinity Variabilities at Cisadane Estuary. The study was conducted at Cisadane Estuary at 18 oceanographic station in Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II from 2003 to 2005. The area of the study was located at the longitude of 106.58° - 106.70° E and the latitude of 5.96° - 6.02°S. The measurements of temperature, salinity, tubidity and light transmision used CTD (Conductivity, Temperature and Depth) Model SBE-19. The result shows that the temperature and salinity vertical profil variabilities at Cisadane Estuary underwent a change in the influence of Transition Monsoon Season I, East Monsoon Season, and Transition Monsoon Season II, for example it was obtained the leg time of the maximum salinity of Transition Monsoon Season II as the same as that of East Monsoon Season. Based on the horizontal and vertical distribution pattern analysis of the interaction between low salinity fresh water of Cisadane River and high salinity sea water of Java Sea, it was also influenced by the season variability and tide. The surface layer was much more influenced by the low salinity and the heat of sunray (seasonal variability) with the weaker intensity to the lower layer. The change of the heat energy by the increase of seasonal temperature occurred in September 2003 to May 2004 ((∆E = 600.6 ⋅ 105 Joule), July to November 2005 (∆E = 84.9 Joule). The decrease of the heat energy occurred in June to September 2003 ((-267.6 ⋅ 105 ), May ke October 2004 (∆E = 189.3 ⋅ 105 Joule) and October 2004 to July 2005 (∆E = -215.4 ⋅ 105 Joule).
KARAKTERISTIK GELOMBANG DAN ARUS DI ERETAN, INDRAMAYU Hadikusumah, Hadikusumah
Makara Journal of Science Vol. 13, No. 2
Publisher : UI Scholars Hub

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Abstract

The Wave and Current Characteristic at Eretan, Indramayu. Erosion process occurs in many places, but each of these processes have their respective characteristics. The purpose of research for understanding the dynamics of the process that caused the coastline of the interaction between air, sea and land. Research has been conducted in Eretan, Indramayu in 2006. The results show the average wave height (H1/3) in February obtained higher (60.4 cm) compared with August (23.6 cm) and in May obtained a much lower (5.7 cm). Current velocity in February and in August obtained dominant raised due to by field of wave and the influence of tidal currents do not exist. Instead current velocity obtained in May was raised by the dominant tidal currents and very small currents generated by the wave field. The influence of the wave field to the velocity and direction of flow will distribute sediment transport in the area of wave breack (breack water) to the coastline. Characteristic wave has a period of 3, 5, and 7 second is the trigger shoreline retreat 1.5 m/year.
Co-Authors J. D. Lekalete Marojahan Simanjuntak