1,720,965 research outputs found
Analisis Massa Air di Perairan Utara Pulau Lembata, Nusa Tenggara Timur.
No full textArus Lintas Indonesia atau Arlindo menyalurkan massa air dari Samudera
Pasifik menuju Samudera Hindia melalui serangkaian selat di Indonesia. Perairan
Utara Pulau Lembata merupakan baggian dari perairan di Laut Flores yang dilalui
Arlindo. Tujuan penelitian ini yaitu menggambarkan stratifikasi massa air,
mengidentifikasi jenis massa air dan menghitung kontribusi North Pacific
Subtropical Water (NPSW) dan North Pacific Intermediate Water (NPIW) di
Perairan Utara Pulau Lembata. Ditentukan pelapisan massa air, kemudian
identifikasi jenis massa air berdasarkan T-S diagram. Kontribusi Massa Air
dihitung menggunakan metode Optimum Multiparameter. Perairan Utara Pulau
Lembata terdiri dari tiga lapisan massa air yaitu lapisan tercampur, termoklin dan
lapisan dalam (homogen). Massa air yang ditemukan yaitu NPSW dan NPIW.
Kontribusi NPSW dan NPIW di Perairan Utara Pulau Lembata yang dibandingkan
dengan Samudera Pasifik Utara masing-masing berkisar antara 30% sampai 75%
pada kedalaman 140 m sampai 190 m dan 50% sampai 70% pada kedalaman 220
m sampai 330 m. Kontribusi NPSW dan NPIW di Perairan Utara Pulau Lembata
yang dibandingkan dengan Selat Makassar masing-masing berkisar antara 30%
sampai 100% pada kedalaman 140 m sampai 190 m dan 40% sampai 100% pada
kedalaman 220 m sampai 330 m
Percampuran Massa Air Di Perairan Utara Lembata Laut Flores
No full textPada pelayaran OTEC 2017, 13 profil CTD dilakukan selama satu periode
pasang surut (25 jam) di perairan Utara Lembata, Laut Flores dengan Kapal Riset
Geomarin III pada 25-26 September 2017. Penelitian ini bertujuan
mendeskripsikan stratifikasi massa air, estimasi nilai koefisien disipasi dan
difisivitas vertikal percampuran turbulen menggunakan Metode Thorpe. Telah
ditemukan bahwa massa air yang masuk ke perairan Indonesia melalui mekanisme
Arlindo yang berasal dari Pasifik Utara (salinitas maksimum massa air subtropis
dan salinitas minimum massa air termoklin Pasifik Utara) telah tereduksi secara
signifikan karena wilayah penelitian yang sangat dekat dengan daratan. Massa air
termoklin bagian atas diindikasikan dengan nilai σθ 24.50 kgm-3 dan salinitas
34.318 - 34.245 PSU. Massa air termoklin bagian bawah memiliki densitas dan
salinitas with σθ 26.50 kgm-3 dan salinitas 34.468 - 34.483 PSU. Ketebalan
lapisan tercampur berada antara 50-90 m dengan lapisan isoterm pada temperatur
20°C yang berfluktuasi dari 90 m hingga 130 m. Nilai rata-rata seluruh profil
CTD untuk Energi Kinetik Dissipasi Turbulen (ɛ) dan Difusivitas Vertikal
Turbulen (KZ) didapatkan masing-masing sebesar 8.826 × 10 -8 Wkg-1 dan 1 × 10-
3 m2s-1
STUDY OF THE SEDIMENTATION TREND IN THE PROSPECTIVE AREA OF PORT OF MARINE CENTER, CIREBON BASED ON REMOTE SENSING DATA
Full text linkA coastal zone is the interface between the land and water that influenced by both of them. Coastal dynamic is influenced by many factors from land and sea, such as sedimentation and current. In order to support marine facility, Marine Geological Institute of Indonesia (MGI) plan to build a port. The prospective area is behind MGI office at Cirebon. This study use multi temporal remote sensing data in order to observe trend of coastline change around MGI. Based on the interpretation of the data, there are sedimentation around the MGI water and abrasion due to the presence of Kejawanan’s jetty and Kalijaga River. The result also shows that the current in this region is moving from southeast to northwest. The presence of the Kejawanan’s jetty stymies the movement of sediment. The sediment which is normally moving to the north of the jetty is then trapped on the south side of the structure, so that the sediment precipitates in this region and makes it as the active region of sedimentation and accretion. The presence mangrove conduces to support sedimentation speed and accretion at this region, because of his function as the catchment area. Abrasion occurs in the eastern part of MGI office at the Kalijaga river mouth within the bay. The Kalijaga River mouth is predicted to be the primary source of sedimentation in this area. The coastline change caused by sedimentation will be continuing as long as it is supplied by the sediment. The direction of the sedimentation is parallel to the jetty and it forms ellipsoid, with the sedimentation/accretion region is behind MGI office. The abrasion area is found in Kalijaga River mouth and a small area beside Kalijaga River. In order to build a port, we have to consider this sedimentation process. One of the alternatives to build the port is to make a quay pile model which gives way the current to pass through the other side of the port. Another alternative is to build the port as a pond model but it needs accuracy in building the mouth of jetty to minimize the sedimentation process.
Keyword : sedimentation, Cirebon, remote sensing
Pantai/pesisir merupakan wilayah antara daratan dan lautan yang masih dipengaruhi oleh keduanya. Dinamika pantai dipengaruhi oleh faktor-faktor dari daratan dan lautan seperti sedimentasi dan arus. Untuk menunjang “marine facility center†Puslitbang Geologi Kelautan (P3GL) bermaksud untuk membangun pelabuhan. Daerah yang prospektif adalah di belakang kantor P3GL, Cirebon. Studi ini menggunakan data citra satelit multi temporal, yang berguna untuk melihat arah perkembangan dan perubahan garis pantai di belakang kantor P3GL dan sekitarnya. Berdasarkan interpretasi data citra, di daerah studi ditemukan adanya daerah akresi/sedimentasi dan daerah abrasi yang disebabkan oleh adanya dermaga Kejawanan dan adanya sungai Kalijaga. Hasil studi juga menunjukkan arah arus umumnya bergerak dari tenggara menuju barat laut. Keberadaan jetty Kejawanan menyebabkan aliran arus dan sedimen terhenti. Sedimen yang seharusnya bergerak ke arah utama menjadi terhalang dan terjebak di bagian selatan jetty, sehingga mengendap di daerah ini. Keadaan ini menyebabkan daerah ini menjadi daerah sedimentasi yang aktif (akresi). Keberadaan mangrove pada daerah ini juga menambah kecepatan sedimentasi di daerah ini, karena berfungsi sebagai daerah tangkapan sedimen. Abrasi terjadi di sebelah timur P3GL, tepatnya pada daerah lengkungan teluk dan di mulut sungai Kalijaga. Daerah mulut sungai Kalijaga diprediksi sebagai sumber sedimen pada daerah ini. Perubahan garis pantai yang disebabkan oleh sedimentasi akan terus berlangsung di daerah ini, selama adanya pasokan sedimen. Sedimentasi ini akan berlangsung sampai arahnya sejajar dengan jetty Kejawanan dan akan membentuk ellipsoid, dengan daerah sedimentasi berada di sekitar jetty dan belakang P3GL sementara daerah abrasi berada di sungai Kalijaga dan daerah sebelahnya. Karena itu, pembangunan pelabuhan P3GL sebaiknya memperhatikan kondisi ini. Salah satu alternatifnya adalah dengan membuat pelabuhan model tiang pancang yang memungkinkan arus dan sedimen untuk bergerak ke sisi sebelahnya. Alternatif lain adalah dalam bentuk kolam pelabuhan, tetapi harus tepat memperhatikan mulut pelabuhan untuk meminimalkan sedimentasi yang terjadi
THE DEVELOPMENT OF PORONG ESTUARY
Full text linkCoastal zone is an area of interaction between the land and the sea. Coastal dynamic is influenced by many factors, such as sedimentation and current. Development of an area in the coastal zone such as estuary is also influenced by suck factors. Development of porong estuary is analyzed by interpretation of Image data, i.e. Landsat TM data that acquired in July, 29th 1975, August, 17th 1994, August, 17th 2000, May, 19th 2002 and Quickbird imagery that acquired in April, 25th 2008. Field survey has been done on April 2008. Based on data interpretation, there are accretion and abrasion in this area. The accretion in the southern part of Porong estuary between 1975 – 2008 is about 33.15 km or about 3.15 km/year equivalent to 1,492.29 Ha. The abrasion area in the northern part of Porong estuary in 33 years since 1975 till 2008 is around 0.5 km or aproximately 15.15 m/year equivalent to 222.45 Ha of wide or 6.802 Ha/year. Development of Porong delta, especially in the southern part of Porong estuary, is caused by change of pattern and main stream of Porong River from the noth to the south. This river delivered large volume of sediments and precipated at this area without or minor influence from the sea. Porong delta is a fluvial delta. Coastal characteristic is mangrove, muddy sediment and locally is sand sediment. Land use in this area is fish pond and mangrove.
Key words: Porong estuary, Satellite imagery
Pantai/pesisir merupakan wilayah antara daratan dan lautan yang masih dipengaruhi oleh keduanya. Dinamika pantai akan dipengaruhi oleh faktor-faktor dari daratan seperti sedimentasi dan faktor dari lautan seperti arus. Demikian halnya perkembangan suatu daerah di pesisir, seperti daerah muara, dipengaruhi oleh daratan dan lautan. Perkembangan muara Porong dianalisis berdasarkan interpretasi citra satelit, yaitu Landsat hasil perekaman 29 Juli 1975, 17 Agustus 1994, 17 Agustus 2004, 19 Mei 2002 dan citra Quickbird perekaman 25 April 2008. Survey lapangan dilaksanakan pada bulan April 2008. Berdasarkan interpretasi citra, ditemukan daerah akresi dan abrasi pada daerah penelitian. Daerah akresi ditemukan di bagian selatan daerah penelitian yaitu sekitar 33.15 km selama 1975–2008 atau sekitar 3.15 km/tahun dengan luasan sekitar 1,492.29 Ha. Daerah abrasi umumnya terdapat di muara Kali Porong sebelah utara, yaitu sejauh 0.5 km selama 33 tahun atau kira-kira 15.15 m/tahun dengan luasan 222.45 Ha atau sekitar 6.802 Ha/tahun. Perkembangan muara dan delta Porong, terutama di muara sebelah selatan, diperkirakan karena adanya perubahan arah utama Sungai Porong, yang berubah dari arah utara kea rah selatan. Aliran sungai ini membawa banyak sedimen dan diendapkan pada daerah ini, karena tiada atau kurangnya pengaruh dari laut. Delta Porong termasuk kawasan delta fluvial. Karakteristik daerah pantai umumnya berlumpur dengan setempat berupa pasir. Penggunaan lahan pada daerah ini umumnya berupa tambak dan mangrove.
Kata Kunci : Delta Porong, citra Sateli
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
KARAKTERISTIK DAN DISTRIBUSI LUMPUR SIDOARJO SEPANJANG SUNGAI, ESTUARI DAN PERAIRAN PORONG
Full text linkSemburan lumpur Sidoarjo (Lusi) di daerah Porong menambah fungsi Sungai Porong menjadi sarana untuk mengalirkan lumpur ke arah laut, karena kemampuan tanggul – tanggul penghalang di sekitar lokasi semburan sangat terbatas. Kondisi ini berdampak pula terhadap terbawanya lumpur lapindo ke perairan Porong. Penelitian ini bermaksud untuk mengetahui sebaran sedimen di sungai, muara dan perairan sekitar Porong terutama yang bersumber dari luapan lumpur Sidoarjo.
Materi yang digunakan dalam penelitian ini adalah sebanyak 30 sampel sedimen hasil sampling yang diambil di lokasi sungai – muara sungai Porong dan 30 sampel sedimen permukaan dasar laut di perairan sekitar muara sungai Porong.
Distribusi umum sebaran sedimen di perairan Porong menunjukkan sedimen lumpur ditemukan di pinggir sungai dan sedimen pasir ditemukan di bagian tengah sungai. Distribusi umum sedimen dasar perairan di sekitar muara Porong berupa pasir, lempung dan lempung lanau pasiran. Hasil analisis mikroskopik dan SEM menunjukkan bahwa sedimen yang berasal dari luapan lumpur Sidoarjo ditemukan di sepanjang aliran Sungai Porong sampai muara, namun belum ditemukan di perairan luar sekitar muara Porong. Sedimen Lusi yang sampai ke muara Porong berukuran butir sampai 2,5 mikron. Deskripsi megaskopis menunjukkan sedimen Lusi pasir - kerikil umumnya berbentuk pipih (halus– agak halus). Hasil SEM menunjukkan bahwa sedimen yang berasal dari lumpur Sidoarjo umumnya seragam dan didominasi berupa smectite. Berbeda dengan sedimen sungai, hasil SEM yang diperoleh dari sampel laut yang menunjukkan sedimennya beragam, berupa montmorilonite, kaolinite dan illite.
Kata Kunci : Sedimen, Porong, lumpur Sidoarjo
The Sidoarjo mudflow in the Porong area increases the functions of Porong River as media to drain the muds towards the sea, because the ability of embankments in the area as a barrier is very limited. This condition intends to determine the presence and distribution of sediment in rivers, estuaries and waters originating from the Lusi mudflow.
The materials used in this study are the sediment sampling results as many as 30 samples taken from the river and off the river mouth and 30 samples of sea surface sediments in the surrounding waters.
General distribution of sediments in the Porong River shows the form of mud sediments are generally found in the riverside and sandy sediment found in the middle of the river, while the distribution of sediments in waters Porong form of sand, clay and sandy silt clay. The results of microscopic and SEM analysis showed that the sediments derived from the Lusi mudflow found along Porong River till estuaries, but they have not reach surrounding water of Porong estuary. The Lusi sediment that reached the estuary Porong sized to 2.5 micron. General megascopic description show the shape of the Lusi sediment as sand-gravel is a flat-shaped (rounded - sub rounded). SEM results showed that the sediments derived from the Lusi is generally uniform and dominated by smectite. In contrast to stream sediments, the SEM results obtained from marine sediment samples show a variety of sediments, in the form of montmorillonite, caolinite and illite.
Key words: Sediment, Porong, Sidoarjo, Mud Overflow (Lusi
KAJIAN DINAMIKA PANTAI SELATAN BANYUWANGI BERDASARKAN HASIL PENAFSIRAN CITRA SATELIT LANDSAT TM
Full text linkHasil kajian citra satelit Landsat Thematic Mapper (TM) menunjukkan daerah pantai selatan Banyuwangi mempunyai empat karakteristik dinamika pantai, yaitu daerah akresi, terjadi di muara Sungai Gonggo, Sungai Baru, dan Sungai Pergaul yang terjadi karena tingginya aliran (run off) dari sungai. Daerah abrasi terjadi di Teluk Grajagan yang terjadi karena adanya arus menerus dari laut sehingga sedimen dari Segoro Anakan tidak bisa diendapkan di daerah teluk dan hanya di muka sungai. Daerah abrasi dan akresi terdapat di teluk Rajegwesi dan Pancamaya yang mempunyai daerah akresi di muara sungai dan daerah abrasi di bagian sisi teluknya. Daerah stabil, terdapat di daerah-daerah yang menjorok ke laut dan sepanjang pantai Alas Purwo. Daerah akresi maupun abrasi umumnya terjadi di daerah topografi rendah, landai dan berupa aluvium, sedangkan daerah stabil terdapat pada daerah dengan topografi bertebing dan batuan penyusun berupa batuan keras.
Kata kunci : sedimen, dinamika pantai, Landsat TM, pantai selatan Banyuwangi
The result of the assesment of Landsat TM imageries show that the coastal area of south Banyuwangi have four coastal dynamic characteristics those are: accretion, abrasion, accretion and abrasion, and stable areas. Accretion area, is located in the river estuary of Gonggo, Baru, and Pergaul rivers that occur by run off from river. Abrasion area, is located in Grajagan Bay caused by continuous current from the sea so that the sediment from Segoro Anakan cannot precipitate in the bay area but only in the river mouth. Abrasion and accretion areas are located in Rajegwesi and Pancamaya Bays where the accretion area is in a river estuary but the abrasion area is in the side shares of the bay. Stable area is located in the peninsula area and along the Alas Purwo coast. Generally the accretion or abrasion areas were occurred in low relief topography and occupied by alluvium, whereas the stable area is characterized by the high relief topography consisting of hard rock.
Key words: sediment, coastal dynamic, Landsat TM, south coast of Banyuwangi
- …
