scholarly journals KONDISI GEOMORFOLOGI DAN KARAKTERISTIK SEDIMEN DASAR LAUT DI WILAYAH PERAIRAN SEBAGIN UNTUK EVALUASI TAPAK PLTN DI BANGKA SELATAN

2015 ◽  
Vol 17 (2) ◽  
pp. 97
Author(s):  
Yuliastuti Yuliastuti ◽  
Heni Susiati ◽  
Yarianto Sugeng Budi Susilo
Keyword(s):  
Bottom Sediment ◽  
Water Intake ◽  
Depth Range ◽  
Sediment Characteristics ◽  
Single Beam ◽  
Sea Bottom ◽  
Sea Bed ◽  
The Stability ◽  
Result Analysis ◽  
Echo Sounder

ABSTRAK KONDISI GEOMORFOLOGI DAN KARAKTERISTIK SEDIMEN DASAR LAUT DI WILAYAH PESISIR PERAIRAN SEBAGIN UNTUK EVALUASI TAPAK PLTN DI BANGKA SELATAN. Telah dilakukan penelitian mengenai kondisi geomorfologi dan karakteristik sedimen dasar laut di wilayah perairan sebagian, Bangka Selatan. Informasi geomorfologi dasar laut sangat berguna dalam hal interpretasi struktur-struktur geologi yang berada di dasar laut. Sedangkan informasi karakteristik sedimen dasar laut bermanfaat untuk memberikan gambaran perlapisan batuan dasar laut dalam kaitannya dengan kestabilan tapak PLTN terkait aspek kegempaan dan penentuan posisi water intake. Penelitian ini bertujuan untuk mengevaluasi kondisi geomorfologi dan karakterisasi sedimen dasar laut di perairan Sebagin, Bangka Selatan. Metodologi yang dipakai untuk mengevaluasi kondisi geomorfologi dasar laut adalah Multi Beam Echo Sounder (MBES) dan Single Beam Echo Sounder (SBES). Sedangkan untuk karakterisasi sedimen dasar laut dilakukan dengan pengukuran seismik refleksi resolusi tinggi menggunakan sub bottom profiling (SBP) dan uji sampel sedimen di daerah penelitian. Hasil penelitian menunjukkan bahwa daerah penelitian merupakan perairan dangkal dengan kedalaman 1- 59 m. Profil geomorfologi dasar laut daerah penelitian cenderung tidak beraturan dan berdasarkan interpretasi seismik tidak ditemukan adanya patahan. Hasil analisis sedimen dasar laut menunjukkan bahwa, distribusi lumpur mendominasi daerah perairan calon tapak PLTN. Kata Kunci : geomorfologi, tapak PLTN, sedimen, sub bottom profile.   ABSTRACT GEOMORPHOLOGICAL CONDITION AND SEA BOTTOM SEDIMENT CHARACTERISTICS OF SEBAGIN COAST FOR NPP SITE EVALUATION IN SOUTH BANGKA. Study on geomorphological condition and sea bottom sediment in the coastal area of Sebagin, South Bangka Regency, Bangka Belitung Province has been performed. Geomorphological of the seabed was valuable to identify geological structures that exist on the seabed layers. Whereas, sediments seabed characteristics was useful to provide portrait of seabed layer due to the stability of NPP site concerning the seismic aspect and the determination of water intake position. The objective of the study was to evaluate geomorphological condition and sea bed sediment characteristics in the South Bangka sea. Methodology used for evaluating geomorphological of the sea bed were Multi Beam Echo Sounder (MBES) and Single Beam Echo Sounder (SBES). While for sea bottom sediment characteristics, SBP together with sediment sample analysis were used. The result of the study showed that the study area was a shallow water sea with a depth range of 1-59 m. Geomorphological profile of the sea bed tend to be irregular and based on the seismic interpretation, there were no fault exists. Result analysis on the sea bottom sediment showed that clay distribution dominated the study area. Keywords: geomorphology, NPP site, sediment, sub bottom profile.

scholarly journals Kajian Karakteristik Sedimen Dasar di Perairan Sungailiat untuk Mendukung Pengembangan Pelabuhan Perikanan Nusantara Sungailiat, Kab. Bangka

2021 ◽  
Vol 10 (2) ◽  
pp. 112-122
Author(s):  
Reno Arief Rachman ◽  
Mardi Wibowo ◽  
Edwin Adi Wiguna ◽  
Sapto Nugroho ◽  
Madyani Madyani ◽  
...  
Keyword(s):  
Bottom Sediment ◽  
Sedimentation Velocity ◽  
Provincial Government ◽  
Sediment Texture ◽  
Sediment Characteristics ◽  
Sediment Control ◽  
Port Development ◽  
Field Surveys ◽  
Sea Bottom ◽  
Very High

Tingkat sedimentasi di muara S. Jelitik sangat tinggi sehingga ketika air laut surut, kapal-kapal tidak dapat keluar masuk ke Pelabuhan Perikanan Nusantara (PPN) Sungailiat. Untuk menangani masalah tersebut, pemerintah secara periodik melakukan pengerukan yang berbiaya tinggi. Oleh karena itu, Pemprov Bangka Belitung merencanakan membangun infrastruktur pengendali sedimen. Dalam perencanaan infrastruktur pengendali sedimen diperlukan data-data karakteristik sedimen dasar. Saat ini kajian khusus karateristik sedimen dasar di kawasan ini masih belum ada. [A1] Oleh karena itu dilakukan kajian ini dengan tujuan mengetahui pola sebaran karakteristik sedimen dasar seperti berat jenis, tekstur sedimen, ukuran d50 butir sedimen dan analisis stastik sedimen dasar. Karakteristik ini sangat penting untuk kajian sedimentasi selanjutnya terutama sebagai data masukan perhitungan kecepatan sedimentasi baik secara analitik maupun dengan pemodelan numerik. Metode yang digunakan dalam kajian ini adalah survei lapangan, pengambilan sampel sedimen dasar, analisis laboratorium dan analisis statistik sedimen. Berdasarkan kajian ini sedimen dasar di perairan Sungailiat ini didominasi oleh pasir sedikit campuran kerikil dengan nilai d50 berkisar antar 1-1,5 mm dan terpilah buruk. Kondisi sedimen dasar berupa pasir mempunyai daya dukung yang baik untuk pengembangan pelabuhan.Sedimentation in the S Jelitik estuary is very high, so when the tide is low, the ships traffic at the Sungailiat Fisheries Port is disturbed. So far, dredging has been done to solve this problem, which requires high costs. To overcome this, the Provincial Government of Bangka Belitung plans to build a sediment control infrastructure. In planning the sediment control infrastructure, sea bottom sediment characteristics data are needed. Currently, there is no specific study of se bottom sediment characteristics in this area. Therefore, this study was conducted with the aim of knowing the distribution pattern of seabottom sediment characteristics such as density, sediment texture, d50 grain size and analysis of the basic sediment statistics. This characteristic is very important for further sedimentation studies, especially as input data for calculating the sedimentation velocity both analytically and by numerical modeling. The methods used in this study are field surveys, sediment sampling, laboratory analysis and sediment statistical analysis. Based on this study, the seabottom sediment in Sungailiat waters is dominated by sand, a little mixture of gravel, with d50 values ranging from 1-1.5 mm and poorly segregated. The seabottom sediment in the form of sand have good capacity for port development.  

scholarly journals KANDUNGAN GAS BIOGENIK DAN TERMOGENIK GAS SEDIMEN DASAR LAUT DI PERAIRAN SELAT MADURA. (PENGARUHNYA TERHADAP SIFAT FISIK DAN KETEKNIKAN)

2016 ◽  
Vol 2 (2) ◽  
Author(s):  
Faturachman Faturachman ◽  
Riza Rahardiawan ◽  
Andy Hermanto Sianipar
Keyword(s):  
Bottom Sediment ◽  
Bottom Sediments ◽  
Engineering Properties ◽  
Infrastructure Development ◽  
Surrounding Area ◽  
Core Drilling ◽  
Biogenic Gas ◽  
Sea Bottom ◽  
Formation Method ◽  
The Stability

Sedimen dasar laut di daerah perairan Madura dan sekitarnya umumnya mengandung kandungan gas yang dampaknya terhadap sifat fisik sedimen dasar laut sangatlah signifikan. Hal ini kaitannya dengan rencana peletakan pondasi bangunan infrastruktur di Perairan Selat Madura dan sekitarnya. Berdasarkan hasil yang diperoleh dari pemboran dimulai dari kedalaman 1 hingga 20 m dibawah permukaan dasar laut mengandung gas biogenik.. dengan kandungan metana berkisar 50 hingga 60 ppm sedangkan kandungan propana dan isobutana kurang dari 0,2 ppm. Kedalaman lebih dari 20 m dibawah permukaan dasar laut hingga 60 m adalah gas termogenik. Konsentrasi maksimum gas termogenik berupa propana, isobutana dan etana pada kedalaman 52.85 m berkisar dari 0,1 hingga 8,453 ppm. Dari kedua tipe gas ini tahap pembentukan diagenesanya berbeda akibat pengaruh temperatur yang berbeda, sehingga mempengaruhi stabilitas sifat fisik dan keteknikan sedimennyapun berbeda pula. Untuk itu dalam perencanaan pembangunan infrastruktur kelak perlu diantisipasi dengan keberadaan gas tersebut. Sea bottom sediment in Madura waters and surrounding area in generally contains gas which the impacts to physical and engineering properties of sea bottom sediments are very significant. It is connecting with the place of infrastructure building in Strait Madura waters and surrounding area. Based on core drilling the biogenic gas is already contented starting from surface 1 to 20 m depth. It contents methane around 50-60 ppm, propane and isobutene less than 0,2 ppm. The second is thermogenic gas which place more than 20 m depth until 60 m, the maximum concentrates of thermogenic gas (propane, isobutene and ethane) in 52,85 depth are around 0,1 - 8,453 ppm. From both types, the formation method in diagnoses phase is different, because of different of temperaturet so in influence the stability of physical and engineering properties sediment will be different. For that the plan of infrastructure development should be anticipated by existence of the gas.

scholarly journals SEA-BED CONFIGURATION IN RELATION TO BREAKWATER STABILITY

1972 ◽  
Vol 1 (13) ◽  
pp. 81 ◽  
Author(s):  
J.H. Van Oarschat ◽  
A. Wevers
Keyword(s):  
The Netherlands ◽  
Present Article ◽  
Water Depth ◽  
Systematic Study ◽  
Public Works ◽  
Irregular Waves ◽  
Sea Bed ◽  
Hydraulic Conditions ◽  
Overall Stability ◽  
The Stability

Stability tests on the Europoort breakwaters, situated on a shallow foreshore, clearly demonstrated the effect of the foreshore configuration on the overall stability. The present article gives a descriptionof the stability experiments and the interpretation leading to general conclusions regarding foreshore effects in combination with hydraulic conditions such as wave period, water depth and wave height. Both regular and irregular waves have been used. The experiments, carried out in commission of the Netherlands Government Department of Public Works (Rijkswaterstaat) were of an applied nature and were not directed primarily to the systematic study of foreshore effects.

Suprabenthic crustacean fauna of a denseAmpeliscacommunity from the English Channel

1996 ◽  
Vol 76 (4) ◽  
pp. 909-929 ◽  
Author(s):  
Jean-Claude Dauvin ◽  
Souaad Zouhiri
Keyword(s):  
Atlantic Ocean ◽  
Water Column ◽  
Vertical Migration ◽  
Fine Sand ◽  
Abundant Species ◽  
Sexually Dimorphic ◽  
English Channel ◽  
Free Swimming ◽  
Sea Bottom ◽  
Sea Bed

Ninety-six species (97, 677individuals) were collected over the course of 6 h in five suprabenthic sledge hauls from a very denseAmpeliscafine sand community from the Bay of Morlaix (western English Channel). All the species migrated into the water column at night (98% of the specimens collected in the suprabenthos were found in the night hauls). The 23 most abundant species collected were classified into five groups based on their height within the water column, but two groups predominated: the upper suprabenthic species, abundant at 0–80–145 m above the sea-bed; and the lower suprabenthic species which were abundant only near the sea bottom (-0–1–0–75 m high). Three different patterns of nocturnal vertical migration were distinguished based on the timing of maximum swimming activity: at dusk; at the beginning of the night; or later in the night. Sexually dimorphic patterns of free-swimming behaviour was observed inAmpeliscaand some other species of Amphipoda (Bathyporeia teniupes, Metaphoxusfultoni), and Cumacea (Bodotria pulchella, Pseudocuma longicornis), with many more males than females migrating into the water column at night. Finally, the density of suprabenthic crustaceans in nocturnal hauls was amongst the highest reported from infralittoral or circalittoral suprabenthic studies on other parts of the Atlantic Ocean sampled during spring.

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