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Abstrak :
ABSTRACT
Sediment bioassay requires a test organism which suitable with the test material, for example sediment. However, benthic phytoplankton as the organism has not been widely applied in Indonesia. Recently, bioassay test still uses phytoplankton which lives in water cplumn such as Chaetoceros gracilis, Tetraselmis sp., Isochrysis sp., or uses another test organism like ussel, sea urchin larvae and amphipod. In addition, Nitszchia sp. is one of culture collection at rResearch Centre for Oceanography so it could be added value of culture collection. Therefore, this paper aims to describe the potential use of phytoplankton benthic, Nitzschia sp. as sediment test organism.

Abstrak :
Telah dilakukan penelitia yang bertujuan mengestimasi stok karbon dalam sedimen pada ekosistem padang lamun di kepulauan Spermonde, khususnya di Pulau Bonetambung dan Pulau Lae-Lae, Makassar. Pengambilan sedimen dilakukan pada area padang lamun dengan menggunakan sediment core berdiameter 5 cm dan kedalaman alat sampai 30 cm. Luasan tutupan lamun diperoleh dari analisis citra satelit Landsat-8 dan kondisi lamun yaitu dengan menggunakan petak contoh berukuran 100cm x 100cm. Hasil analisis citra landsat-8 didapatkan luasan tutupan ekosistem padang lamun di Pulau Bonetambung yakni 14.18 ha dimana didapatkan 4 kategori tutupan lamun yaitu sangat padat 0.2 ha , padat 0.7 ha , sedang 6 ha dan jarang 7 ha . Sedangkan pada Pulau Lae-Lae diperoleh luasan ekosistem padang lamun yakni 5,04 ha dan didapatkan 3 kategori tutupan lamun yaitu jarang 0,36 ha , sedang 3,42 ha dan padat 1,23 ha. Hasil analisis contoh sedimen didapatkan pada Pulau Bonetambung dan Pulau Lae-Lae didominasi oleh tipe sedimen pasir kasar. Didapatkan nilai rerata kandungan karbon sedimen pada ekosistem padang lamun yaitu di Pulau Bonetambung 9,6 MgCha-1 pada kedalaman 0-30 cm sedangkan di Pulau Lae-Lae diperoleh 8,98 MgCha-1. Total Stok karbon sedimen pada area padang lamun Pulau Bonetambung yaitu 136,08 MgC atau setara dengan 503,5 MgCO2 e sedangkan di Pulau Lae-Lae didaptkan 44,86 MgC atau setara dengan 165,9 MgCO2 e. Hasil penelitian menunjukkan bahwa ekosistem lamun berperan sangat penting dalam menjaga stok karbon di laut sehingga perlu mendapat perhatian untuk konservasinya. ......Research has been conducted to estimate carbon stocks of sediments in the seagrass ecosystems of the Spermonde islands, particularly on the Bonetambung Island and Lae Lae Island, Makassar City. Sediment collection was carried out on the seagrass beds area using 5 cm diameter core sediment and the depth up to 30 cm. The seagrass cover area was obtained from Landsat 8 satellite imagery analysis and seagrass condition was measured by using sample plots 100cm x 100cm . The result of landsat 8 image analysis was found that the extent of seagrass ecosystem cover on Bonetambung Island was 14.18 ha, which found 4 categories of seagrass cover that is very solid 0.2 ha , solid 0.7 ha, medium 6 ha and rare 7 ha . While on Lae Lae Island, the seagrass ecosystem area is 5,04 ha and 3 rams cover category is rarely 0,36 ha, medium 3,42 ha and solid 1,23 ha. The result of sediment sampling was obtained on Bonetambung Island and Lae Lae Island was dominated by rough sand sediment type. The average value of sediment carbon content in the seagrass seagrass ecosystem is found in Bonetambung Island 9.6 MgCha 1 at a depth of 0 30 cm while on Lae Lae Island is 8.98 MgCha 1. Total Stock of sediment carbon in the seagrass area of Bonetambung Island was 136.08 MgC or equivalent to 503.5 MgCO2 e while on Lae Lae Island was obtained 44.86 MgC or equal to 165.9 MgCO2 e. The results show that the seagrass ecosystem plays a very important role in maintaining carbon stocks in the sea so it needs to get attention for its conservation.

Abstrak :
Penelitian Oseanografi di perairan Laut Jawa telah dilaksanakan bulan September 2004. Sebaran suspensi permukaan berkisar antara 0.018 gr/l terendah ditemukan di sebelah Selatan Pulau kalimantan hingga 0.053 gr/l tertinggi di sebelah Barat dari Pulau Kalimantan Selatan. Sebaran suspensi di kedalaman perairan bagian tegah berkisar antara 0.023 gr/l terendah di sebelah Barat Pancel hingga 0.051 gr/l tertinggi yang tersebar di sebelah Barat dari Pulau Kalimantan Selatan. Sebaran suspensi di kedalaman perairan bagian dasar berkisar antara 0.022 gr/l terendah yang didapatkan di sebelah Barat daya dari Pulau Kalimantan Selatan hingga 0.051 gr/l tertinggi yang tersebar di sebelah Barat dari Pulau Kalimantan Selatan. Endapan sedimen di permukaan dasar hanya beberapa sentimeter berwarna coklat kekuningan merupakan indikasi suplai sedimen dari daratan melalui sungai cukup tinggi. Endapan sedimen di dasar perairan sekitar Kalimantan Selatan yang dekat dengan daratan ditemukan endapan lumpur yang encer di permukaan dengan warna coklat dan di lapisan bawahnya lanau lumpuran.

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Suspension and Sedimentation Studies in Java Sea Water. Oceanography study of the Java Sea Water has been done on September 2004. The lowest total suspended solid in the water surface was 0.018 gr/l at the south part of Kalimantan and the highest was 0.053 gr/l at the west part of South Kalimantan. The lowest total suspended solid values in the medium sea level was about 0.023 gr/l at the west part of Pancel and reaches the value of 0.051 gr/l at the west part of South Kalimantan. At the bottom of deep sea level, the lowest total suspended solid value were about 0.022 gr/l at the west by south of South Kalimantan and the highest was found in the west part of South Kalimantan which has the value of 0.051 gr/l. The sediment has a yellowish brown color in the depth of several centimeters which indicates of highly sedimentation supply from the river. Sediment at the bottom of South Kalimantan waters which is located near the land was found more like a mud on the surface and silt on the inside.

Abstrak :
Penelitian tentang kandungan bahan organik, senyawa n-alkana, aromatik, dan total hidrokarbon dalam sedimen di perairan Raha, Sulawesi Tenggara telah dilakukan pada Juni 2001. Hasilnya menunjukkan bahwa sedimen di stasiun 1 dan 4 telah tercemar oleh hidrokarbon minyak bumi. Hal ini tampak dari perbandingan antara F1/F2 (fraksi hidrokarbon jenuh/fraksi hidrokarbon aromatik) > 1. Sedangkan berdasarkan kandungan total hidrokarbonnya, menurut kriteria dari NAS (National Academy of Science) hanya sedimen di stasiun 2 dan 5 yang telah tercemar oleh senyawa hidrokarbon minyak bumi (>100 ppm).

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The content of organic material, n-alkana, aromatic compound and hydrocarbon total in the sediment was carried out in the waters of Raha, Southeast of Sulawesi. Investigation on content of organic material, n-alkana, aromatic compound and hydrocarbon total in the sediment was carried out in the waters of Raha, Southeast of Sulawesi in June 2001. The results showed that the sediment at station 1 and 4 were polluted by hydrocarbon compound. This condition is showed by F1/F2 ratio (comparation between saturated hydrocarbon fraction with aromatic hydrocarbons fraction) > 1. According to NAS (National Academy of Science) criteria on total hydrocarbon content, station 2 and 5 only were polluted by hydrocarbons compound (>100 ppm).

Abstrak :
Penutupan tambang inkonvensional di Teluk Klbat, Bangka diduga berpengaruh tehrhadap kondisi lingkungan perairan setempat. Informasi ini bisa dipelajari dari karakterisasi sedimen yang meliputi konsentrasi logam berat, toksisitas sedimen terhadap diatom, Chaetorceros gracilis dan korelasi antara logam berat (Pb, Cd, Cu, Zn dan Ni) dalam sedimen terhadap pertumbuhan diatom, C. gracilis. Sampel sedimen diambil dari 16 stasiun pengamatan pada bulan Maret dan Juni 2007 dengan menggunakan Smith Mc Intryre Grab 0,5 meter persegi. Konsentrasi logam berat (Pb, Cd, Cu, Zn dan Ni) diukur dengan menggunakan alat Atomic Absorbtion Spectrophotometer (AAS). Diatom dipaparkan pada sedimen yang diambil dari perairan Teluk Klabat untuk uji penghambatan perptumbuhan selama 96 jam. Konsentrasi logam berat dalam sedimen secara umum masih di bawah standar dari Canadian Environmental Quality Guidelines kecuali di Stasiun 9 di mana konsentrasi Pb-nya mencapai 32,54 ppm. Uji toksisitas sedimen menunjukkan ada efek penghambatan sedimen terhadap pertumbuhan C. gracilis pada bulan Juni. tidak ada korelasi yang signifikan antara konsentrasi logam berat dalam sedimen dengan toksisitas terhadap diatom pada tingkat kepercayaan alfa=0,01.

Abstrak :
Deposition of suspended sediment was measured with sediment traps in shallow coastal waters colonized by Thallasia dominated seagrass in pannikiang Island,South Sulawesi (Indonesia)....

Abstrak :
Limbah minyak bumi dapat menghambat atau mengurangi transmisi cahaya matahari ke dalam laut. Hal tersebut dapat menghambat pertumbuhan mikro alga yang memanfaatkan cahaya matahari untuk melakukan fotosintesis. Limbah tersebut dapat menghasilkan material toksik yang akan terakumulasi pada sedimen yang tercemar minyak bumi. Penelitian ini bersifat eksperimental dengan 6 perlakuandan 3 ulangan. Perlakuan dalam penelitian adalah sedimen dengan penambahan minyak (A), sedimen yang tercemar minyak yang dibioremediasi dengan penambahan kultur tunggal bakteri (B), sedimen tercemar minyak yang dibioremediasi dengan penambahan konsorsium bakteri (C), sedimen yang tercemar minyak yang dibioremediasi dengan penambahan pupuk (D), sedimen yang tercemar minyak dengan penambahan kultur tunggal bakteri dan pupuk (E), dan sedimen tercemar minyak yang dibioremediasi dengan penambahan konsorsium bakteri dan pupuk (F). Kontrol yang digunakan adalah air laut yang sudah diautoklaf dan ditambahkan media WalnenonEDTA. Data yang didapat kemudian dihitung menggunakan program TOXSTAT yangber basis ANOVA. Hasil penelitian menunjukkan bahwa sedimen tercemar minyak tidak secara signifikan memengaruhi pertumbuhan Pavlovasp.

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Crude oil waste can detain or reduce the penetration of sunlight into the sea. This may decelerate the growth of microalgae that needs the sunlight to make photosynthesis. Crude oil waste can produce toxic materials which accumulate in the crude oil contaminated sediment. This is an experimental research with 6 treatment and 3 replicates. The treatments in this experiment are sediment with crude oil (A), bioremediated crude oil-contaminated sediment with the addition of single culture bacteria (B), bioremediated crude oil-contaminated sediment with the addition of consortium bacteria (C), bioremediated crude oil-contaminated sediment with the addition of fertilizer (D), bioremediated crudeoil-contaminated sediment with the addition of single culture bacteria and fertilizer (E), and bioremediated crudeoil-contaminated sediment with the addition of consortium bacteria and fertilizer. Control in this experiment was auto claved sea water with the addition of Walnemedianon EDTA. The data was calculated using TOXSTAT program which is based on the ANOVA. Result shows that the crude oil contaminated sediment does not affect the growth of Pavlovasp significantly.

Abstrak :
Aliran debris merupakan suatu tipe gerakan sedimen dengan jumlah banyak, yang terjadipada waktu gunung api meletus atau dalam bahasa Indonesia disebut aliran lahar. Tujuan penelitian ini adalah mengembangkan suatu percobaan untuk menentukan karakteristik aliran di atas dasar saluran tetap dan bergerak yang mendekati sifat aliran debris. Beberapa parameter aliran diperiksa dengan maksud untuk mengetahui situasi aliran dan juga gaya geser aliran terhadap partikel dapat ditinjau. Jadi hubungan antara besarnya konsentrasi sedimen dengan kedalaman aliran dan diameter partikel serta gaya gesek diatas dasar saluran dapat diketahui. Khususnya gaya seret butiran yang bekerja pada suatu tiang telah diukur untuk menentukan koeflsien kekasaran aliran debris yang menyerupai tipe aliran di lapangan. Akhirnya parameter-parameter karakteristik aliran yang telah diukur, itu dapat dibandingkan dengan satu sama lainnya.

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Debris flow as a type of massive sub-aerial sediment motion, which occurs at the time of volcanic eruptions is sometimes called lahar, in Indonesian term. The purpose of this study is to develop an experiment for determining the flow characteristics on fixed and movable beds, which close to real debris flow. The parameters governing the flow situation are examined, and the frictional drag of the flow on the particles was considered. In particular there is an understanding of the relationships between concentration, flow depth and particles diameter, and friction force on a bed. Special drag force on a pile was measured to investigate friction coefficient of debris flow as typical problem. The flow characteristics parameters were measured for comparison.

Abstrak :
ABSTRAK
North Coast of Java Island continues to experience coastal dynamics which resulted significant coastline erosion problems. According to the Ministry of Marine and Fisheries data (KKP), from 100 locations of coastline erosion in 17 provinces of Indonesia, North Coast of Java Island suffered the worst erosion, reaching 745 km or 44 percent of total coastline length. The shoreline retreat can be caused by three factors: sea level rise, erosion and land subsidence. The aim of this research was to determine the correlation between sediment equilibrium in coastal cells and the initial hypothesis of land subsidence which caused a coastline retreat. The method to calculate sediment equilibrium uses hypothetical sediment budget model. Modeling itself is done along the North Coast of Java. LITDRIFT model of Longshore Sediment Drift is employed to assess the coastline profile. The result of the research shows that there is anomalous model that is the condition of sediment is surplus but the condition of the field is backward. Several locations experienced a sediment surplus but experienced a coastline retreat, and after comparison with field observations and secondary data there was evidence of land subsidence: Pondok Bali Beach, Randusongo Beach, Muara Reja Beach, Depok Beach, Slamaran Beach, Jeruksari-Mulyorejo Beach and Sriwulan Beach. This models result can be used as an initial indicator of the land subsidence causing the coastline to retreat. In order to solve the erosion and sedimentation problem, the detail study with more comprehensive parameter needs to be conducted