Browsing by Author "Rifardi"

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    Analisis Kualitas Sedimen Permukaan Selat Bengkalis Propinsi Riau
    (2014-11-09) Hardi, Sandro Situmeang; Rifardi
    Penelitian ini dilakukan pada mei 2012. Penelitian ini bertujuan untuk mengetahui pola sebaran Pb dan Cu Pada sedimen permukaan serta komposisi material penyusun sedimen di perairan Selat Bengkalis. Metode yang digunakan adalah metode survey, dimana penentuan titik stasiun sebanyak 7 stasiun. Sampel sedimen diambil dari perairan Selat Bengkalis menggunakan Eckman Grab. Analisis logam berat dan komposisi material penyusun sedimen menggunakan AAS Perkin Elmer 3110 dan Saringan Bertingkat, di Laboratorium Kimia Laut Fakultas Perikanan dan Ilmu Kelautan Universitas Riau. Hasil Penelitian menunjukkan bahwa rata –rata logam Pb yang mengendap pada sedimen adalah 45,95 ppm, dimana konsentrasi logam Pb berkisar antara 30,15 – 54,70 ppm. Sedangkan Logam Cu memiliki konsentrasi rata – rata 67,73 ppm dengan kisaran antara 62,10 – 71,20 ppm. Daerah kawasan aktivitas pelabuhan dan limbah masyarakat pesisir memiliki konsentrasi logam Pb dan Cu tertinggi, dimana logam diduga berasal dari limbah aktivitas kapal dan pemukiman, yang mana logam akan masuk ke perairan Selat Bengkalis kemudian terakumulasi di perairan dan lama – kelamaan akan mengendap di dasar perairan yaitu sedimen. Sedangkan Konsentrasi logam Pb dan Cu terendah terdapat pada kawasan pesisir mangrove. Nilai ERL untuk logam Pb dan Cu adalah 46,70 dan 34,00 ,dan nilai ERM untuk logam Pb dan Cu adalah 218,00 dan 270,00 ppm. Kata Kunci : Pb, Cu, Pola Sebaran, Sedimen permukaan
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    Gambaran Kondisi Lingkungan Masa Lalu Dan Masa Datang
    (2015-01-22) Rifardi
    Pertambahan jumlah populasi manusia secara pesat telah berlangsung sejak awal abad ke 20 dan memberikan tekanan ekologis terhadap lingkungan karena peningkatan aktivitas pemanfataan sumberdaya alam baik di daratan maupun di lautan Proses sedimentasi merupakan salah satu proses yang disebabkan oleh alam dan artifisial manusia, telah memberikan perubahan tatanan ekologis di mana sedimen tersebut diendapkan. Oleh sebab itu, Okada dan Smith (2005) mengajukan dua isu utama tentang konsep lingkungan bumi yakni lingkungan yang dikontrol oleh fenomena alamiah selama 4.600 juta tahun sejarah bumi dan lingkungan yang dipengaruhi oleh aktivitas manusia. Sehubungan dengan hal tersebut, maka sampai saat ini dapat dinyatakan bahwa sedimentologi adalah suatu ilmu tentang lingkungan bumi, dan tujuan penelitian sedimentologi juga dapat dibedakan menjadi penelitian lingkungan bumi dari proses alamiah dan lingkungan hasil aktivitas manusia. Lingkungan alam yang dihasilkan dari proses alamiah disebut SEDIMENTOLOGI LINGKUNGAN, sedangkan lingkungan alam yang dihasilkan dari aktivitas manusia disebut SEDIMENTOLOGI SOSL\
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    Komposisi Butiran Pasir Sedimen Permukaan Selat Bengkalis Propinsi Riau
    (2014-11-09) Devy, Yolanda Putri; Rifardi
    Penelitian ini dilaksanakan pada Bulan Mei-Juni 2012 di Perairan Selat Bengkalis, bertujuan untuk mengetahui material penyusun sedimen secara horizontal di Perairan Selat Bengkalis. Sampel diambil menggunakan Eckman Grab dari 7 titik stasiun kemudian dianalisis untuk menentukan komposisi dan kandungan bahan organik pada sedimen. Hasil penelitian menunjukkan bahwa komposisi sedimen di Perairan Selat Bengkalis tersusun atas lithogenous (batuan, mika, dan kuarsa) dan biogenous (serasah, foraminifera, dan molusca). Komposisi lithogenous khususnya batuan mendominasi di perairan dan keberadaannya merata pada setiap stasiun. Persentase tertinggi terdapat pada lokasi yang dekat dengan daratan dan merupakan salah satu daerah yang mendapatkan pengaruh arus pasang pertama kali sehingga diduga material yang terbawa arus pasang dari Selat Malaka dan arus surut dari Sungai Pakning tertumpuk di sekitar stasiun ini. Selain itu, jenis batuan juga dapat berasal dari hasil erosi dan kegiatan antropogenik di pinggir sekitar perairan. Persentase lithogenous yang terendah terdapat pada daerah yang dekat dengan kawasan mangrove dimana pada stasiun ini tinggi akan komposisi biogenous khususnya serasah karena banyak mendapat suplai bahan organik sertas arus yang lemah mengakibatkan serasah mengendap dengan baik di daerah ini. Kandungan bahan organik sedimen pada stasiun yang dekat dengan kawasan mangrove tertinggi diantara stasiun lainnya karena mendapatkan suplai bahan organik dari kawasan mangrove di sekitar perairan dan arus yang lemah di pinggir perairan menyebabkan bahan organik dapat mengendap dengan baik. Sedangkan stasiun yang mengandung bahan organik terendah berada pada stasiun yang dekat Selat Malaka, ini diduga material yang terbawa arus pasang tidak banyak mengandung bahan organik . Sementara pada stasiun yang dekat dengan Sungai Siak dan Sungai Pakning mengandung bahan organik yang cukup tinggi, hal ini diduga bahwa aliran sungai membawa banyak kandungan bahan organik. Kata kunci : komposisi, arus pasang surut, sedimen horizontal, Selat Bengkalis
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    Marine Resources Degradation on the Eastern Part of Rupat Strait based on the Sedimentological Aspects Poin of View
    (2016-03-31) Rifardi; Wau, Visius Uracha S; Tumpal; Girsang, Edy J
    The main purpose of this study is to clarify the relationship between degradation of merine resources and sedimentary enviroments based on sediment characteristics and oceangraphic. The obtained data are all based on analysis results of grab, acumulated and core samples taken from the Eastern Part of Rupat Strait in East Coast of Somatera Island. Bottom sediment samples were collected at 30 stations in the strait using grab sampler, 3 stations using sediment trap and 9 stations by gravity corer in June 2013. The samples were used for mechanical grain size analysis, ignition loss method, and grain-sand composition analysis. In addition, concentration of total suspended sediment from the 30 stations are also analized. The Eastern Part of Rupat Strait can be subdivided into three areas based on the general trend of sediment characteristics and oeanographic obersevation as following: 1) the area along coast of Sumatera Island from west to east in the strait is characterized by fine-grained sediments, the highest total suspended sediments, and dominantly terrigeneous sediments under influence of rather weak longshore currents and poorly sorted and high content organic matter sediments discharged by rivers, 2) the middle area of the strait from west to east characterized by rahther fine-grained sediments, high total suspended sediments, and high biogeneous sediments. The area may correspond to the boundary between the waters masses derived from Rupat Island and of from east coast of Sumatera Island, and 3) the area along coast of Rupat Island from west to east in the strait is characterized by coarse-grained sediments, low contents of total suspended sediments, and rather high biogeneous sediments eventhought low content of organic matter sediments, under influence of strong longshore currents. Judging from the distribution pattern of sedimentological aspects and of oceanographic characteristics, marine resources of the Eastern Part of Rupat Strait tend to be degraded namely the area along coast of Sumatera Island showing high degradation, the middle area of the strait is rather high, and the area along coast of Rupat Island indicated low degradation.
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    Padatan Tersuspensi Di Perairan Muara Sungai Rokan, Provinsi Riau, Indonesia
    (2014-11-09) Wira, Rahmansyah; Rifardi
    This research was conducted from 3-10 December 2009 at Rokan River Estuary. This study aimed to find out how big the supply of suspended solids entering the Rokan River estuary waters. The method used his the method of survey and nonrandom purposive sampling. Suspended matter content analysis followed standard methods proposed by the Indonesian National Standard in Mukminin (2008). Results showed the supply of suspended solids entering through either sequentially streamflow into the ebb tide and at low tide to high tide his for station 3 (Mill River mouth) of 1322.764 g / s and 340.844 g / sec, to station 4 (Estuary Rokan River right part) of 329,079.770 gr / sec and 297,900.580 gr / sec, and for station 5 (Rokan River mouth to the left) of 1412989.100 gr / sec and 1,131,184.300 gr / sec. Key Word : Suspended Solids, Estuary.
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    Pemanasan Global Dari Sudut Pandang Aspek Sedimentologi Diperairan Bahagian Selatan Estuaria Bagan, Pandai Timur Sumatera, Indonesia
    (2014-11-09) Rifardi
    Tulisan ini bertujuan untuk menjelaskan fenomena pengendapan (sedimentasi) akibat adanya Akselarasi proses sedimentasi berasal dari supplai sedimen daratan (aktiviti antropogenik) dan angkutan sedimen oleh arus dan gelombang (aktiviti alami) dan hubunganya dengan pemanasan global. Kemampum ekosistem perairan dalam menyerap emisi gas rumah kaca seperti C02 digambarkan dengan melakukan kajian kes diperairan bahagian selatan Estuaria Bagan, Pantai Timur Sumatera, indonesia Sampel sedimen permukaan dan total sedimen/padatan tersuspensi (TSS) diambil dari 21 stesen dengan menggunakan sediment sampler dan van dorm sampler pada bulan Jun 2010. Sampel sedimen dianalisa dengan metoda mechanical grain size analysis, ignition loss method, bulk chemical analysis menggunakan atomic absorption spectrometer dan sand-grain composition analysis. Secara umum, daerah studi dicirikan oleh sediment berbutiran pasir (medium-grained sand), kandungan bahan organic rendah (kecil dari 10%), konsentrasi logam Fe dan K tinggi, mengindikasikan pemasukan sedimen dari datratan sebagai akibat dari aktivity antropogenik. Pola sebaran konsentrasi kedua logam ini dan sedimen lithogeneous menggambarkm bahawa arus pasang surut (aktiviti alami) memainkan peranan penting dalam proses sedimentasi Konsentrasi total suspended sedimen sangat tinggi (exteremely high) berkisar 1.000-33.000 mg/l pada saat surut (ebb curent) dan 1.000-14.000 mg/l pada saat pasang (tide current). Selan itu konsentrasi total suspended sedimen di kolam air dekat dasar lebih tinggi dibandingkan di permukaan,, mengindikasikm terjadinya turbulensi sedimen dasar oleh sistem arus kuat. Pola dan proses sedimentasi menyebabkm menurunnya secara drastik kemampum perairan bahagian selatan Estuaria Bagan menyerap emisi gas rumah kaca (C02) kerana tergannggu produktiviti phytoplankton dm makrophyta. Konsentrasi total suspended sedimen dan tingkat kekeruhan (40-360 NTU) sangat tinggi (extremely high) menghambat proses fotosintesis tumbuhan air. Jika dalam kondisi kualiti air esturia belum tercemar dengan konsentrasi padatan total tersuspensi (TSS) di bawah 20 mg/l untuk koral dan lamun, dan 80 mg/l untuk mangrove. Dan tingkat kekeruhan lebih kecil dari 5 NTU, maka Perairan Bagian Selatan Estuaria Bagan mampu menyerap CO2 sebesar 55.649,88 ton/tahun, setara dengan kemampuan menyerap CO2 hutan rawa gambut tropis primer seluas 120,44 ha , hutan rawa gambut tropis sekunder seluas 181,785 ha, hutan tanaman lahan gambut Acacia crassicarpa seluas 675,44 ha, kebun kelapa sawit seluas 1141,14 ha, dan kebun karet seluas 712,88 ha. Kata Kunci: pemanasan global, sedimentasi, perairan esturia
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    Proses Deposisi Sedimen Di Perairan Dompak Provinsi Kepulauan Riau Indonesia
    (2014-11-09) Amirul, Mukminin; Rifardi; Edwar, Rufli
    The purpose of this study is to claiify relationship between sedimentation process including accumulation rate total suspended solid and grain size-sediment, and anthropogenic activities. Sediment samples consist of accumulation rate, total suspended solid and surface sediments were collected from 4 stasions in the dompak sea, Riau Archipelago province, Indonesia in July to August 2008. Present work revealed that station 4 is characterized by the bigbest accumulation rate (2.21 ml /cm2/ day ), very fine sand and very poorly sorted sediment, under the influence of bauxite mining supplied terrigeneous sediments. Contrastingly, station 3 is occupied by the lowest accumulation rate accumulation rate (0.48 ml/cm2/day), high suspended sediment (2 mg/l) , and coarse silt, under the influence of rather stagnant water masses. Rather high accumulation rate (0.72 ml/ cm2/day),coarse silt and well sorted sediments are found in station 1 which affected by waters transportation and binterland development activities. The sediment of station 2 is characterized by accumulation rate (0.55 ml/cm2 / day), fine sand and moderately well sorted sediment. The sediment is assumed to be derived from surrounding areas which is trapped by mangrove . the result at the probability calculation sedimentation occurring in Dompak Sea is affedted by anthropogenic activities (p<0.05) in addition, natural process play also importance role on the sedimentation. Keywords : sedimentation, anthropogenic activities, natural process, Dompak Sea
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    Sediment Composition As Vertical In Dumai Coastal Waters
    (2014-11-09) Nunung, Fidiatur R; Rifardi; Edwar, Rufli
    The research was conducted in March to April 2011 in Dumai coastal waters. The purpose of this research was to understand the materials composing the sediment profiles vertically. Field survey method was applied with location of study consisting 7 stations. Sediment samples were taken by using the Gravity core, in every station a length of 12 cm was cut and divided into 5 layers with thickness of 1 cm. Sediment sample obtained from field was analyzed in laboratory by using sand composition analysis. The result showed that sediment composition found consisting of lithogenous sediment (rock fragment, mica and quartz) and biogenous (plant fibers, foraminifera and mollusc). The vertical composition difference was not clear. Rock fragment dominated at every layer in stations north and west sides of PT. Pertamina UP II Dumai indicate rock fragment supply proceed from erosion of land and abrasion caused by tidal current and wave. In stations of east sides from PT. Pertamina UP II Dumai the upper and lower layers dominated by plant fibers that could be coming from mangrove decomposition in this area. The overall results indicate that all sediment materials in the area were derived from the similar source, thus reflecting the small differences in the sediment material. Keyword : composition, vertical sediment, Dumai coast
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    Sedimentological Aspects and Relative Sedimentation Rates in the Dumai Coastal Waters, Riau Province Indonesia
    (2014-11-09) Rifardi; Edwar, Rufli; Syahminan; Suwarni; Renti, Butar Butar; Nunung, Fidiatur
    The main purpose of this study is to reveal the sedimentary enviroments based on sediment characteristics and relative sedimentation rates. The obtained data are all based on analysis results of core samples taken from the Dumai Coastal Waters located off the north coast of Dumai City Indonesia. Bottom sediment samples were collected at 7 stations in the waters using gravity corer in March 2011. The samples were used for mechanical grain size analysis, ignition loss method, and bulk chemical analysis. In addition, the topmost one centimeter of core samples, which approximately 10 cc of wet sediments, was utilized for benthic foraminiferal study, namely, the study of of L/Tl values to infer the relative sedimentation rates. The Dumai Coastal Waters, Riau Province Indonesia is subdivided into three areas based on the general trend of sediment characteristics and relative sedimentation rates as following: 1) the central part of the waters is characterized by coarse-grained sediments, high relative sedimentation rates and dominantly terrigeneous sediments which under influence of rather strong tidal currents, 2) the eastern and western parts of the waters are characterized by relatively coarse-grained sediments, rather high relative sedimentation rates and relatively high biogeneous sediments which are influenced by longshore currents, and 3) the area off the coast (central part) is characterized by fine-grained sediments, the highest relative sedimentation rates. The area correspond to the boundary between the waters masses derived from Rupat Strait and of from Dumai Waters and is under influence of weak tidal current The distribution of crude oil content in sediments indicate that study area under influence of tidal and longshore currents. Judging from the distribution pattern of crude oil content in sediments, sediments polluted by crude oil were transported northwestward and northeastward by longshore currents and spread toward north by tidal currents, of the Dumai Coastal Waters. Key words : sedimentary enviroments, relative sedimentation rates, Dumai Coastal Waters
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    Sedimentological Aspects And Relative Sedimentation Rates In The Dumai Coastal Waters, Riau Province Indonesia
    (2016-04-07) Rifardi; Syahminan; Suwarni; Butar Butar, Renti; Fidiatur, Nunung
    The main purpose of this study is to reveal the sedimentary enviroments based on sediment characteristics and relative sedimentation rates. The obtained data are all based on analysis results of core samples taken from the Dumai Coastal Waters located off the north coast of Dumai City Indonesia. Bottom sediment samples were collected at 7 stations in the waters using gravity corer in March 2011. The samples were used for mechanical grain size analysis, ignition loss method, bulk chemical analysis, sand grain composition. In addition, the topmost one centimeter of core samples, which approximately 10 cc of wet sediments, was utilized for benthic foraminiferal study, namely, the study of of L/Tl values to infer the relative sedimentation rates. The Dumai Coastal Waters, Riau Province Indonesia is subdivided into three areas based on the general trend of sediment characteristics and relative sedimentation rates as following: 1) the area near the coast and central area of of the water, both of which are characterized by coarse sediments, high relative sedimentation rates and dominantly terrigeneous sediments, the area off the coast characterized by relatively coarse sediments, rather high relative sedimentation rates and relatively high biogeneous sediments, 3) the area relatively close to the coast characterized by fine sediments, low relative sedimentation rates and high biogeneous sediments. The distribution of crude oil content in sediments indicate that study area under influence of tidal and longshore currents. Judging from the distribution pattern of crude oil content in sediments, sediments polluted by crude oil were transported northwesward and northeastward by longshore currents and spread toward north by tidal currents, of the Dumai Coastal Waters.