scholarly journals The Importance of Under-Keel Sound Velocity Sensor in Measuring Water Depth with Multibeam Echosounder

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5267
Author(s):  
Artur Grządziel
Keyword(s):  
Sound Velocity ◽  
Water Depth ◽  
Beam Steering ◽  
Velocity Sensor ◽  
Bathymetric Survey ◽  
Multibeam Echosounder ◽  
Years Of Service

The basic and most commonly used application of modern multibeam echosounders (MBES) is the bathymetric survey. Surface sound velocity errors introduce errors on beam steering angles and consequently errors in depth and position values. Due to systematic malfunction and troubleshooting of the sound velocity sensor (SVS) on board Polish Navy hydrographic ship Arctowski, attempts to solve the problem were made. All the inspections and cleaning of the sensor were performed with the use of divers or while staying in the shipyard. Diving work did not always bring the expected results and periodic ship docking was quite expensive. The article shows the importance of the SVS sensor in bathymetric measurements using multibeam echosounder. Selected problems of the sensor operation and temporary solutions were presented. The paper provides a description of practical solutions implemented aboard the navy ship Arctowski. The idea and implementation were the result of the author’s experience gained during 18 years of service on board that ship.

Application of Unmanned Surface Vehicles in Coastal Environments: Bathymetric Survey using a Multibeam Echosounder

2020 ◽  
Vol 95 (sp1) ◽  
pp. 1152
Author(s):  
Byung-Cheol Kum ◽  
Dong-Hyeok Shin ◽  
Seok Jang ◽  
Seung Yong Lee ◽  
Jung Han Lee ◽  
...  
Keyword(s):  
Coastal Environments ◽  
Bathymetric Survey ◽  
Multibeam Echosounder ◽  
Unmanned Surface Vehicles

scholarly journals The importance of sound velocity determination for bathymetric survey

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 46
Author(s):  
Pier Paolo Amoroso ◽  
Claudio Parente
Keyword(s):  
Sound Velocity ◽  
Acoustic Waves ◽  
Physical Parameters ◽  
Ligurian Sea ◽  
Data Set ◽  
Correct Operation ◽  
Column Temperature ◽  
Bathymetric Survey ◽  
Depth Measurement

Bathymetric surveys are carried out whenever there is a need to know the exact morphological trend of the seabed. For a correct operation of the echo sounder, which uses the principle of acoustic waves to scan the bottom and determine the depth, it is important to accurately determine the sound velocity in water, as it varies according to specific parameters (Density, Temperature, and Pressure). In this work, we want to analyse the role of sound velocity determination in bathymetric survey and its impact on the accuracy of depth measurement. The experiments are conducted on data set provided by “Istituto Idrografico della Marina Militare Italiana” (IIM), the official Hydrographic Office for Italy, and acquired in the Ligurian sea. In our case, the formulas of Chen & Millero (UNESCO), Medwin, and Mackenzie were applied. The introduction of errors on chemical-physical parameters of the water column (Temperature, Pressure, Salinity, Depth) simulating inaccurate measurements, produces considerable impacts on sound velocity determination and subsequently a decrease of the depth value accuracy. The results remark the need to use precise probes and accurate procedures to obtain reliable depth data.

scholarly journals Diode laser lidar wind velocity sensor using a liquid-crystal retarder for non-mechanical beam-steering

2014 ◽  
Vol 22 (22) ◽  
pp. 26674 ◽  
Author(s):  
Peter John Rodrigo ◽  
Theis F. Q. Iversen ◽  
Qi Hu ◽  
Christian Pedersen
Keyword(s):  
Liquid Crystal ◽  
Diode Laser ◽  
Wind Velocity ◽  
Beam Steering ◽  
Velocity Sensor

scholarly journals Pemetaan Batimetri untuk Pertimbangan Alur Pelayaran Kapal Nelayan di Pantai Sembulang, Kecamatan Galang

2020 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Farouki Dinda Rassarandi ◽  
Siti Noor Chayati ◽  
Luthfiya Ratna Sari ◽  
M Zainuddin Lubis ◽  
Oktavianto Gustin ◽  
...  
Keyword(s):  
Water Depth ◽  
Local Population ◽  
Topographic Map ◽  
Tourist Attractions ◽  
Multibeam Echosounder ◽  
Depth Data ◽  
Fishing Vessels ◽  
Cruise Line ◽  
Traditional Fishing

Sembulang is located in a strategic maritime location and supports the majority of the local population to work as fishermen. In addition, Sembulang is also directly adjacent to the waters of Mubut Island which is one of the favorite tourist attractions in Batam and also to the waters leading to Bintan and Tanjungpinang, making it a popular port for people in that location. However, until now there has not been an official sea map or cruise line map for traditional fishing boats / local transportation to support economic and tourism activities there. The flow of a cruise is very closely related to the depth of a waters. Water depth data can be used by fishermen and boat captains as a reference when they are sailing across Sembulang Beach. The purpose of this study was to analyze the bathymetry conditions in Sembulang Beach, Galang, which were used as a reference for safe and efficient ship grooves considerations. Bathymetry mapping is done by using multibeam echosounder to create a seafloor topographic map at the research location which is then analyzed based on the depth and width of the cruise line which is ideal for the specifications of traditional fishing vessels. Based on the analysis that has been done, it can be concluded that only ships with size <5 GT with the form of "V" Pump Boat, "V", "V" High Bow, "V" Katir, "V" Without Katir, "U" Katir and 5 GTs with safe "U" and "V" shapes to be anchored at Sembulang pier. In other words, traditional fishing boats with a size of GT 10 GT are not recommended to dock at the pier.

A112 Measurement of Oil Circulation Ratio in HFO-1234vf Refrigeration Cycle with a Sound Velocity Sensor

2012 ◽  
Vol 2012 (0) ◽  
pp. 3-4
Author(s):  
Lei Gao ◽  
Yoshinari Maema ◽  
Takuro Shibasaiki ◽  
Tomohiro Honda
Keyword(s):  
Sound Velocity ◽  
Refrigeration Cycle ◽  
Velocity Sensor ◽  
Circulation Ratio

scholarly journals Pengaruh Sound Velocity Terhadap Pengukuran Kedalaman Menggunakan Multibeamechosounder di Perairan Surabaya

2016 ◽  
Vol 2 (2) ◽  
pp. 161-176
Author(s):  
Eko Prakoso A S ◽  
Widodo S. Pranowo ◽  
Ainun Pujo Wiryawan ◽  
Dian Adrianto
Keyword(s):  
Sound Velocity ◽  
Multibeam Echosounder

Penentuan kedalaman merupakan tugas mendasar bagi seorang hidrografer. Dalam menentukan kedalaman harus memahami apa saja yang mempengaruhi kondisi suatu perairan. Tujuan utama dari sebagian besar survei hidrografi, adalah untuk mendapatkan data dasar untuk penyusunan peta laut dengan penekanan pada fitur yang dapat mempengaruhi keselamatan bernavigasi. Kondisi perairan Indonesia merupakan perairan tropis yang sangat berpengaruh terhadap perubahan kecepatan rambat suara (sound velocity). Dalam kegiatan survei dan pemetaan Hidro-Oseanografi, sound velocity termasuk bagian dari aspek Hidrografi maupun Oseanografi. Terutama pada saat Survei Batimetri, kecepatan rambat suara sangatlah berpengaruh terhadap koreksi dari hasil pengukuran kedalaman menggunakan Multibeam Echosounder, selain pasang surut. Pada penelitian ini sound velocity diukur menggunakan Sound Velocity Profiler (SVP), dan dilakukan perhitungan berdasarkan in situ Conductivity Temperature and Depth (CTD). Data CTD mewakili variabilitas musim dari INDESO Project Badan Litbang KKP turut digunakan untuk memperkaya analisis SVP. Hasil sementara menunjukkan bahwa variabilitas musiman salinitas dan temperatur sangat signifikan mempengaruhi kondisi sound velocity. Pengaruh sound velocity terbesar rata-rata terjadi pada bulan November sebesar 1546,37 m/s dengan nilai maksimum 1548,24 m/s pada stasiun 2, sedangkan pengaruh sound velocity yang terkecil terjadi pada bulan Agustus sebesar 1539,6 m/s dengan nilai minimum 1539,06 m/s pada stasiun 2 tahun 2015 di perairan Surabaya. Pada lapisan permukaan perairan hingga kedalaman 17 meter, sound velocity cenderung mengikuti pola salinitas. Untuk kedalaman yang lebih dalam dari 17 meter, sound velocity cenderung mengikuti pola temperatur. Namun dari kedua parameter utama tersebut, variabilitas salinitas yang sangat mempengaruhi sound velocity.

Sound velocity of glassy Pd 80 Si 20 after heavy-ion irradiation at low temperatures

2002 ◽  
Vol 82 (11) ◽  
pp. 2333-2339
Author(s):  
G. Schumacher ◽  
R. C. Birtcher ◽  
D. P. Renusch ◽  
M. Grimsditch ◽  
L. E. Rehn
Keyword(s):  
Sound Velocity ◽  
Low Temperatures ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Heavy Ion Irradiation

Symmetric-pair antennas for beam steering, direction finding or isotropic-reception gain

1991 ◽  
Vol 138 (4) ◽  
pp. 368 ◽  
Author(s):  
R. Benjamin ◽  
W. Titze ◽  
P.V. Brennan ◽  
H.D. Griffiths
Keyword(s):  
Beam Steering ◽  
Direction Finding ◽  
Symmetric Pair

SOUND VELOCITY IN METAL-NONMETAL TRANSITION REGION OF HIGH PRESSURE MERCURY PLASMAS

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-685-C7-686 ◽  
Author(s):  
M. Inutake ◽  
K. Suzuki ◽  
S. Fujiwaka
Keyword(s):  
High Pressure ◽  
Sound Velocity ◽  
Transition Region ◽  
Nonmetal Transition

Evaluation of Discharges by CSOs from Water Depth Measurements: Case Study of a Lateral with a Low and Long Crest

2002 ◽  
Author(s):  
M. Zug ◽  
F. Blanchet ◽  
C. Joannis ◽  
G. Ruban ◽  
F. Cohen-Solal
Keyword(s):  
Water Depth
Sign in / Sign up

Export Citation Format

Share Document