scholarly journals INTEGRASI DATA MULTIBEAM BATIMETRI DAN MOSAIK BACKSCATTER UNTUK KLASIFIKASI TIPE SEDIMEN

2017 ◽  
Vol 7 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Anang Prasetia Adi ◽  
Henry M Manik ◽  
Sri Pujiyati
Keyword(s):  
Multibeam Echosounder ◽  
Sediment Analysis ◽  
Angular Response ◽  
Combined Uncertainty

Sistem multibeam echosounder tidak hanya memperoleh presisi tinggi dalam pengolahan data batimetri saja, tetapi juga mendapatkan resolusi tinggi dalam data backscatter strenght (BS) dasar perairan. Sejumlah penelitian telah menerapkan metode akustik untuk mengklasifikasikan tipe sedimen dasar perairan dengan menggunakan data backscatter, dan hasil klasifikasi yang diperoleh lebih baik daripada sampling sedimen secara tradisional. Tujuan penelitian ini untuk mengintegrasikan hasil data multibeam echosounder dalam penentuan batimetri dan pengklasifikasian tipe sedimen dasar perairan.Penelitian menggunakan data survei batimetri multibeam echosounder Kongsbergs EM 2040C di Sungai Kapuas Pontianak, Kalimantan Barat. Penentuan batimetri menggunakan metode Combined Uncertainty and Bathymetry Estimator (CUBE), sedangkan klasifikasi tipe sedimen menggunakan metode Angular Response (ARA) dan Sediment Analysis (SAT) yang semuanya tertanam dalam software Caris Hips and Ships versi 9.0. Hasil klasifikasi tipe sedimen secara unsupervised terdapat empat tipe sedimen. Nilai intensitas tipe sedimen kerikil (gravel) berkisar antara -16 dB hingga -13 dB, pasir (sand) berkisar antara -22 dB hingga -17 dB, lumpur (silt) antara -26 dB hingga -23 dB dan lempung (clay) berkisar antara -34 dB hingga -29 dB.

scholarly journals Analisis Nilai Hambur Balik pada Kapal Karam (Wreck) Menggunakan Data Multibeam Echosounder di Perairan Belawan

2018 ◽  
Vol 4 (1) ◽  
pp. 51-67
Author(s):  
Brama Setya Indramawan ◽  
Anang Prasetia Adi ◽  
Eka Djunarsjah ◽  
Wahyu W. Pandoe
Keyword(s):  
Response Analysis ◽  
Analysis Tool ◽  
Side Scan Sonar ◽  
Multibeam Echosounder ◽  
Sediment Analysis ◽  
Angular Response

Wreck (kapal karam) sangat membahayakan bagi pelayaran terutama di alur pelayaran, maka menjadi penting untuk dapat mengetahui posisi, dimensi dan karaktersik wreck tersebut. Pendeteksian wreck selama ini menggunakan magnetometer dan side scan sonar, padahal dengan kemampuan Multibeam Echosounder (MBES) saat ini pendeteksian itu dapat dilakukan oleh MBES, karena mampu menghasilkan data batimetri dan data hambur balik dari material dasar laut. Penelitian ini memanfaatkan data batimetri MBES untuk mendapatkan nilai kedalaman dan nilai intensitas dari wreck. Dari nilai intensitas inilah dapat diketahui material badan kapal yang tenggelam. Data yang digunakan adalah data MBES Kongsberg EM2040C hasil Survei Pushidrosal tahun 2016 di perairan Belawan. Pengolahan data menggunakan software Caris Hips and Ships 9.0 dengan cara membuat CUBE Surface untuk mendapatkan nilai kedalaman dan estimasi dimensi (panjang dan lebar) dari wreck. Untuk mendapatkan nilai hambur balik menggunakan metode Angular Response Analysis (ARA) dan Sediment Analysis Tool (SAT). Hasil penelitian ini diperoleh nilai intensitas dari kapal karam berkisar -9,7 sampai -3,02 dB pada wreck bermaterial besi dan -27,3 sampai -21,5 pada wreck bermaterial kayu dengan nilai koefisien refleksi 0.928 dan 0.414

scholarly journals PENGUKURAN DAN ANALISIS HAMBUR BALIK AKUSTIK MENGGUNAKAN TEKNOLOGI MULTIBEAM ECHOSOUNDERUNTUK KLASIFIKASI SEDIMEN DASAR LAUT TELUK PALU

2020 ◽  
Vol 12 (2) ◽  
pp. 439-455
Author(s):  
Rizqi Ayu Farihah ◽  
Henry Munandar Manik ◽  
Gentio Harsono
Keyword(s):  
Support Vector Machine ◽  
Silty Sand ◽  
Support Vector ◽  
Response Analysis ◽  
Multibeam Echosounder ◽  
Angular Response

Nilai Hambur balik dapat menggambarkan kondisi sedimen di dasar perairan, termasuk ukuran butir dari sedimen dasar perairan. Tujuan penelitian ini untuk mendeteksi, mengklasifikasi dan memprediksi tipe dasar perairan berdasarkan nilai hambur balik menggunakan Angular Response Analysis (ARA) dan Support Vector Machine (SVM) sehingga didapatkan peta spasial sebaran sedimen di Teluk Palu. Data batimetri dan intensitas hambur balik diambil pada 5-9 Oktober 2018 menggunakan multibeam echosounder Kongsberg EM 302 dengan frekuensi 30 kHz dan 10 sampel sedimen tahun 2012 milik PUSHIDROSAL. Hasil penelitian menunjukkan sebaran sedimen dasar Teluk Palu dengan metode ARA didominasi oleh pasir (sand) dan lanau (silt) sedangkan dengan metode SVM didominasi oleh pasir berlanau (silty sand), lanau (silt) dan pasir (sand). Hasil uji akurasi untuk metode ARA sebesar 50% sedangkan hasil uji akurasi untuk metode SVM menghasilkan overall accuracy dengan nilai 60%. Prediksi tipe dasar perairan di Teluk Palu yang paling mendekati keadaan sebenarnya adalah hasil prediksi dengan metode SVM yaitu pasir berlanau, lanau dan pasir.

scholarly journals Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA

2008 ◽  
Vol 8 (1) ◽  
pp. 2249-2273
Author(s):  
G. Hülsen ◽  
J. Gröbner ◽  
A. Bais ◽  
M. Blumthaler ◽  
P. Disterhoft ◽  
...  
Keyword(s):  
Absolute Calibration ◽  
Angular Response ◽  
The Usa ◽  
Combined Uncertainty ◽  
The Absolute ◽  
Spectral Responses ◽  
Good Agreement

Abstract. A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The owners calibrations were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determination of the angular responses have deviations below ±4% and the spectral responses agree within ±20%. A "blind" intercomparison of the erythemally weighted irradiances derived by the respective institutes and PMOD/WRC showed consistent measurements to within ±2% for the majority of institutes. One institute showed slightly larger deviation of 10%. The differences found between the different instrument calibrations are all within the combined uncertainty of the calibration.

scholarly journals Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA

2008 ◽  
Vol 8 (16) ◽  
pp. 4865-4875 ◽  
Author(s):  
G. Hülsen ◽  
J. Gröbner ◽  
A. Bais ◽  
M. Blumthaler ◽  
P. Disterhoft ◽  
...  
Keyword(s):  
Absolute Calibration ◽  
Angular Response ◽  
The Usa ◽  
Combined Uncertainty ◽  
The Absolute ◽  
Spectral Responses ◽  
Good Agreement

Abstract. A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The calibrations provided by the instruments owners were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determinations of the angular responses have deviations below ±4% and the spectral responses agree within ±20%. A "blind" intercomparison of the erythemally weighted irradiances derived by the respective institutes and PMOD/WRC showed consistent measurements to within ±2% for the majority of institutes. One institute showed slightly larger deviation of 10%. The differences found between the different instrument calibrations are all within the combined uncertainty of the calibration.

Multiswath multibeam echosounder for efficient seabed backscatter imaging and classification

2020 ◽  
Author(s):  
Didier Charlot ◽  
Philippe Alain ◽  
Geraldine Duffait ◽  
Olivier Lerda ◽  
Guillaume Matte
Keyword(s):  
Grazing Angle ◽  
Sidescan Sonar ◽  
Sediment Type ◽  
Ecosystem Research ◽  
Multibeam Echosounder ◽  
Single Beam ◽  
Angular Response ◽  
Seabed Classification ◽  
Sonar System ◽  
Echo Sounder

<p><strong>MULTISWATH MULTIBEAM ECHOSOUNDER FOR EFFICIENT SEABED BACKSCATTER IMAGING AND CLASSIFICATION</strong></p><ol><li><strong> Didier Charlot<sup>(1)</sup>,Philippe  Alain<sup>(1)</sup>, Géraldine Duffait<sup>(2)</sup> ,Olivier Lerda<sup>(2)</sup>, Guillaume Matte<sup>(2)</sup></strong></li> </ol><p> (1) iXBlue Sonar System Division, 256 rue Rivoalon, 29200 Brest,  France</p><p>(2) iXBlue Sonar System Division, 46 Quai F. Mitterrand, 13600 La Ciotat, France.</p><p> </p><p>               Managing marine resources and habitats require a classification system to identify and characterized seabed properties. Acoustic systems are recognized to be remote sensing tools that measure efficiently sediment properties and seabed morphology [1].Single beam, multibeam echosounder and sidescan sonar systems are commonly used to characterize seabed type by respectively analyzing echo strength returns, backscatter (BS) angular response, and texture analysis. Multibeam  (and interferometric sidescan ) systems  have the great advantage to measure the bottom bathymetry hence the true grazing angle at least in the across track direction. But there are still some challenges to face to get a robust calibrated BS value. </p><p>First, standard multibeam systems  do not measure directly the full BS backscatter angular response on each soundings. This can be accomplished by using a dual axis multibeam to record the BS in the along track direction[2]. The BS angular response is  a powerful metric to characterize the sediment type. </p><p>Second, the BS response is sensitive to the insonification direction (azimuth) and this dependency should also be considered to improve calibration procedure.  Recently, a full 3D steerable high resolution multibeam system has been developed [3]. First investigation ([3],[4]) have shown the high potential of multiswath multibeam system. With the 3D steerable swath capability, the bidirectional BS angular response can be recorded on each insonified soundings. This presentation will emphasize recent advances in processing using the  full multiswath multibeam capabilities.</p><p> </p><p>References:</p><p>[1] John T. Anderson, Editor,”Acoustic Seabed Classification of Marine Physical And biological Landscapes”, ICES Report N° 286, August 2007</p><p>[2]M.  Gutberlet and H. W. Schenke ,“HYDROSWEEP : New Era in High precision bathymetric Surveying in Deep and Shallow water” , Marine Geodesy,1989, Vol13,pp1-23</p><p>[3] F. Mosca & al., “Scientific potential of a new 3D multibeam echosounder in fisheries and ecosystem research”, Fisheries Research 178 pg. 130-141, 2016.</p><p>[4] Nguyen, Trung Kiên , Charlot D. , Boucher  J.-M , Le Chenadec G.,  Fablet R., “Seabed classification using a steerable multibeam echo sounder”. Oceans 2016 MTS/IEEE 2016,Monterey</p><p>[5] Nguyen, Trung Kiên, ”Seafloor classification with a multi-swath multi-beam echo sounder”, PhD thesis 2017, IMT Atlantique; http://www.theses.fr/2017IMTA0035</p>

A TRANSECT ACROSS AND SEDIMENT ANALYSIS OF A FORMER FLUVIAL ENVIRONMENT

2016 ◽  
Author(s):  
Daniel P. Childers ◽  
◽  
Abigail Conaway ◽  
Jeffery Manner ◽  
Kristina Snyder ◽  
...  
Keyword(s):  
Sediment Analysis

SEDIMENT ANALYSIS OF AN ARTIFICIAL BERM NEAR FT. MYERS BEACH, FLORIDA

2017 ◽  
Author(s):  
Sara A. Ramos ◽  
◽  
Gary A. Zarillo ◽  
Kerri Allen
Keyword(s):  
Sediment Analysis

scholarly journals Density Measurements of an Air-Like Binary Mixture over the Temperature Range from 100 K to 298.15 K at Pressures up to 8.0 MPa

2021 ◽  
Vol 42 (9) ◽  
Author(s):  
Nils von Preetzmann ◽  
Reiner Kleinrahm ◽  
Philipp Eckmann ◽  
Giuseppe Cavuoto ◽  
Markus Richter
Keyword(s):  
Binary Mixture ◽  
Saturated Vapor ◽  
Saturation Pressure ◽  
Transmission Error ◽  
Magnetic Suspension ◽  
Mixture Component ◽  
Liquid Region ◽  
Force Transmission ◽  
Temperature Range ◽  
Combined Uncertainty

AbstractDensities of an air-like binary mixture (0.2094 oxygen + 0.7906 nitrogen, mole fractions) were measured along six isotherms over the temperature range from 100 K to 298.15 K at pressures up to 8.0 MPa, using a low-temperature single-sinker magnetic suspension densimeter. The measurements were carried out at T = (100, 115, and 130) K in the homogeneous gas and liquid region, and at T = (145, 220, and 298.15) K in the supercritical region (critical temperature TC = 132.35 K); in total, we present results for 52 (T, p) state points. The relative expanded combined uncertainty (k = 2) of the experimental densities was estimated to be between 0.03 % and 0.13 %, except for four values near the critical point. The largest error is caused by the magnetic suspension coupling in combination with the mixture component oxygen, which is strongly paramagnetic; the resulting force transmission error is up to 1.1 %. However, this error can be corrected with a proven correction model to an uncertainty contribution in density of less than 0.044 %. Due to a supercritical liquefaction procedure and the integration of a special VLE-cell, it was possible to measure densities in the homogeneous liquid phase without changing the composition of the liquefied mixture. Moreover, saturated liquid and saturated vapor densities were determined at T = (100, 115, and 130) K by extrapolation of the experimental single-phase densities to the saturation pressure. The new experimental results were compared with the mixture model of Lemmon et al. for the system (nitrogen + argon + oxygen) and the GERG-2008 equation of state.

scholarly journals Speeds of Sound in Methanol at Temperatures from 233.33 to 353.21 K at Pressures up to 20 MPa

2021 ◽  
Vol 42 (5) ◽  
Author(s):  
Christian W. Scholz ◽  
Roland Span
Keyword(s):  
Equation Of State ◽  
Path Length ◽  
Speeds Of Sound ◽  
Pulse Timing ◽  
Combined Uncertainty ◽  
Pulse Echo

AbstractWe report experimental speeds of sound in methanol. Measurements were conducted at temperatures from 233 to 353 K with pressures up to 20 MPa using the double-path length pulse-echo technique. The relative expanded combined uncertainty (k = 2) in measurement was estimated to vary from 0.012 to 0.014%, considering contributions from temperature, pressure, path length calibration, pulse timing, and purity of the sample. Experimental speeds of sound gained in the scope of this work were compared with the equation of state by de Reuck and Craven, as well as with further data from literature.

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