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INDONESIA
Jurnal Hidrosfir Indonesia
Published by Badan Pengkajian dan Penerapan Teknologi
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Articles 128 Documents
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METODE PENENTUAN PADAT PENEBARAN BUDIDAYA PERAIRAN BERDASARKAN KEBUTUHAN OKSIGEN TERLARUT Santoso, Arif Dwi
Jurnal Hidrosfir Indonesia Vol 1, No 3 (2006)
Publisher : Jurnal Hidrosfir Indonesia

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Abstract

Environmental parameters of Hurun Bay estuary were monitored at the site of13.5 m3 floating net cages for Epinephelus cromileptes in July 2003. Averagedissolved oxygen inside cages was 3.68 – 6.76 ( average 5.35) mg/L with watertemperature 28.64 – 29.72 (29.09) oC. Salinity 32.69 – 33.0 (32.94) psu andturbidity 0.27 – 13.62 ( 1.15) NTU. Inflow rate of cages was 72 m3/hr withcurrent velocity 2.3 - 5.1 cm/s. Results showed that the functions of respirationrate for correlation between respiration of E. cromileptes and their weight wasy = 0.0065x + 0.1202 meanwhile the functions of optimum stocking density wasY = 1170.7 X -0.5648. On basis of dissolved oxygen budged, estimated optimum stocking density for lower limit was 128 ind/m3 for fish 50 g in average, 60 ind/m3 for fish 200 g and 21 ind/m3 for fish up to 1200 g.
MIKROALGA (CHLORELLA, SP.) SEBAGAI AGENSIA PENAMBAT GAS KARBON DIOKSIDA Mulyanto, Adi
Jurnal Hidrosfir Indonesia Vol 5, No 2 (2010)
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Abstract

This experiment was conducted to respon the issue of global warming where carbon dioxide emmited from burning fossil fuel was expected to be the reason. The experiment was performed at Institute for Environmental Technology, Puspiptek, Serpong within 35 days. Algae (Chlorella, sp.)was cultivated in a raceway type pond. The pond has effective volume of 1000 liters provided with agitator and located in a roofed area. Basic machanism of the CO2 sequestration was photosynthesis process, where chlorophyl, water, CO2, and sun light should be present. Reasearch result identified that algae has high capability for carbon dioxide (CO2) sequestration. Therefore, algae can be utilized as an agent for carbon sink. CO2 utilized was come from commercial CO2 tank which was available in the local market and has concentration of about 45%. During experiment, the culture was fed with gradually increasing of CO2 concentration, namely 5.91%, 8.18%, and 9.16%. The macro and micro nutrients were also added into the culture. CO2 absorption by the culture in average only reached 5.34%. therefore, the increasing of CO2 fed into the culture decreased theefficiency of CO2 absorbed. During the experiment, the growth of microalgae was also elaborated.
STUDI TENTANG LAJU RESPIRASI BIOTA PERAIRAN Santoso, Arif Dwi
Jurnal Hidrosfir Indonesia Vol 1, No 1 (2006)
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Abstract

The respiration rate of Hump back grouper (Cromileptes altivalis) and TigerGrouper (Epinehelus fuscogutattus) were measured in the laboratory usingfish-chamber to determine how deferent among them and how these wereaffected by body weight. Results showed body weight influenced respirationrates and there are variation of studied respiration levels between Humpback grouper and Tiger Grouper. Respiration rate of Hump back and Tigergrouper were 534,2 mgO2/h and 421,4 mgO2/h respectively. The functionsfor correlation between respiration of Humpback grouper and their weightwas y = 0.0065x + 0.1202 while for Tiger grouper was y = 0.0038x + 0.6108.
STUDI EKOHIDROLOGI ’EMBUNG’ SIRANI HALIWEN BAGI PENGEMBANGAN EKOWISATA DI KABUPATEN BELU - NTT Widiyono, Wahyu
Jurnal Hidrosfir Indonesia Vol 4, No 2 (2009)
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Abstract

     ‘Embung’ Sirani, located 10 km from the capital city of Belu District, East Nusa Tenggara Province, is the biggest of the 27 ‘embungs’ in this area. The ‘embung’ has 211.2 of watershed area, 20 m of water depth and 1.860.000 m3 of water storage capacity to irigate rice field. To promote the unic and strategic ‘embung’ as an ecotorism object, an ecohydrologic study was conducted in 2008. Ecotourism objects which can be developed around the Sirani ‘embung’ in Belu Districts are the lake tourism, canoe ride around the ‘embung’; agro-tourism of horticulture plant and fishing pond at the ‘embung’ downstream; and agroforestry-tourism at the watershed area. ‘Embung’ ecotourism as an integrated conservation by participation of the local people is needed to develop.
DOMINANT FACTORS OF JAKARTA’S THREE LARGEST FLOODS Aldrian, Edvin
Jurnal Hidrosfir Indonesia Vol 3, No 3 (2008)
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Abstract

In year 2002, 2007 and 2008 Jakarta experienced heaviest flood in early February from rain that precipitate in several days ahead. Those rainfalls take place in early morning for few consecutive days. The extreme early morning rainfall occurs due to three dominant phenomena the Madden Julian oscillation wet phase, the cold surge and a vortex in the southwest of Java. The cold surge from north compressed the air mass over the north of Jakarta Bay, picked up as much as water vapor over it and brings to the bay. Especially at night during intense land breeze, south ward movement of compressed and moist air collided frontally with the land breeze andcaused strong uplifting at the coast. The latter phenomenon created strong convection at the Jakarta metropolitan areas at early morning and caused extreme rainfall events. Those daily rainfall rate are almost and exceed the monthly rainfall values. Analises of data from satellite observation, rain gauge, wind and radar imagery prove the mechanism of extreme weather in early morning that cause heavy flood over Jakarta. The incoming of those three phenomena could be predicted in advance with quite a certainty. The MJO is a feature that has 50 days oscillation so that MJO wet phase could be predicted in advance up to 2 weeks. The cold surge that comes from Siberia has index of sudden drop of pressure in Hongkong before propagate to Southeast Asia, thus could be predicted in advance about one week ahead. Lastly the vortex development in southwest of Java could be predicted up to 1 days in advanced. Those information on the three major or dominant weather feature will be a good early warning for heavy flood of Jakarta especially in early February.
Model Transpor Penyebaran Sampah di Teluk Jakarta Setiawan, Agus; Riyadi, Agung
Jurnal Hidrosfir Indonesia Vol 2, No 3 (2007)
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Abstract

Spreading of wastes from 11 river mouths around the Jakarta Bay during the east and west monsoons is simulated in this study, making use of transport model. The data of wastes weight and concentration used in this study are obtained from “Marine and Jakarta Bay Wastes Prevention” pilot project conducted by the government of DKI Jakarta. In this simulation, it is assumed that the weight of daily outflow of wastes is constant and the composition of wastes is not taken into account.From the simulation results there are found that during the west monsoon, wastes in the Jakarta Bay mostly transported eastward, spread until 3 km and accumulated in the eastern part of the Jakarta Bay. Wastes with concentration more than 10 kg/L spread out to the offshore until 1 km from the shore line or river mouth. On the other hand, the wastes mostly transported westward during the east monsoon. These wastes spread westward until 5 km and mix with the wastes from the river mouths which are located in the western part of the Jakarta Bay. The amount of wastes which are spread westward during the east monsoon is greater than the amount of wastes which are spread eastward during the west monsoon.Keywords: Jakarta Bay, wastes, transport model
PEAT CARBON, CIRE AND CLIMATE INTERACTIONS Aldrian, Edvin
Jurnal Hidrosfir Indonesia Vol 3, No 1 (2008)
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Abstract

This study describes the interaction between forest fire and climate, which focuses on the peatland fire contribution and its carbon released. We established the interannual carbon released that refer to some previous result and we extend the results for the last decade(1997 to 2007) of total carbon and PM10 estimations. We found a significant relationship betweenclimate and hotspot number, which indicate the behavior of fires over Sumatera and Kalimantan over the last decade, except for 2006. Improvement in the correlation occurs when we utilized second half of the year in to consideration. Apparently there are two regional climatic systemsthat drive or force the annual variability of hotspots over Sumatera and Kalimantan through trans equatorial cold surge in the first half of year and El Nino in the second half of the year. The cold surge phenomenon is crucial for the hotspot variability for Riau province, while the latter could impacts both Sumatera and Kalimantan. Strong climate forcing indicates, by excluding 2006, that Indonesian peat pool is vulnerable to the regional climatic system or a victim of regional climate perturbation. Recent data (latest four years) shows larger fluctuation from the climatic factor. The 2006 fires and their emission are exceptionally high and divert from the strong correlation between fire and climatic factor. The 2006 fire close to 1997 firein amount and emission (88.4%) and PM10 (87%) and hotspot number (92.8%). Overall, during the last decade, the carbon emission from forest fires in Indonesia fluctuates following climate variability and could not be generalized to emit carbon at persistently high level every year.
PENERAPAN TERUMBU KARANG BUATAN (RUMPON) DI PERAIRAN KUTAI KARTANEGARA KALIMANTAN TIMUR Riyadi, Agung
Jurnal Hidrosfir Indonesia Vol 5, No 2 (2010)
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Abstract

Artificial reef (rumpon) are tools in the form fish collecting objects or structures that are designed made from natural or artificial materials that are placed permanently in marine waters. Many oil rigde spread in coastal area. Majority of fisherman from Kutai Kartanegara catch a fish around oil ridge and very dangerous. The Application of artificial reef technology as coral reefs have been set at Kutai Kartanegera waters in 2009. Activities are particularly in assessment site selection survey for deployment the artificial reef depand the quality and depth water. Artificial reef made of concrete with a total 60 pieces and has a size of 2 x 2.5 meters. The results of physical and chemical analysis such as water temperature, depth, salinity, turbidity, based material and dissolved oxygen in the normal condition. The dominat of sediment in a sand bed is muddy and has a marine topography a slope, because there is still considerable influence of the Mahakam delta. There are six potential locations for mooring artificial reef at position UTM 1.555000/9975100; 2.555823/9978221;3.559711/9981510;4.562515/9986117;5.558448/9991855; 6.557506/9987513. Artificial reef placement depths ranging 15 - 25 meters.
STRUKTUR KOMUNITAS PERIFITON PADA SUBTRAT KACA DILOKAIS PEMELIHARAAN KERANG HIJAU (Perna viridis ) DI PERAIRAN TELUK JAKARTA Arman, Entang
Jurnal Hidrosfir Indonesia Vol 1, No 2 (2006)
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Abstract

Perifiton are water microorganisms that live sessil on the substrat, and they contribute to build sea water biodiversity. Perifiton are able to live on the substrat that there is no life before so that perifiton can be mentioned as the pioneer to build a new ecosystem. Perifiton community can cause new community such as mussel community and fish community with the result that they form a new ecosystem. This perfiton role is used in green mussel culture in Kamal Muara, Jakarta Bay. This research tries to estimate the perifiton community growth that lives in the area of green mussel culture in Kamal Muara. The research shows that perifiton community is dominated by Bacillariophyceaeand Chlorophyceae. The value of biodiversity index is 1.72-301, the value of evennes index is 0.39-0.72 and the dominancy index is 0.17-0.57.
PENERAPAN UJI HAYATI DENGAN LEMNA SP. UNTUK MENGKAJI KUALITAS AIR SUNGAI YANG MENERIMA AIR LIMBAH INDUSTRI TEKSTIL DI KABUPATEN BANDUNG Priyanto, Budhi
Jurnal Hidrosfir Indonesia Vol 4, No 3 (2009)
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Abstract

To assess the possibility cause of deterioration to rice production in several villages downstream to Rancaekek, Bandung, we conducted laboratorium experiment using Lemna as the bioassay agent. Lemna sp. has been exposed to mixtures of inorganic tissue culture medium salts and filtered raw wastewater (effluent) taken from textile mill in Rancaekek, Bandung. The system was then incubated for 7 days under continuous daylight fluorescent lamps and the number of fronds and fresh weight were determined. The results show that EC50 of the textile industry’s wastewater is 37.5% of the wastewater. The LOEC value is 30% and the NOEC is 15%. This experiment suggests that wastewater from textile industry is potentially dangerous to aquatic plants, including rice and vegetable, if it was discharged to public water body without appropriate pre-treatment.

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