Estimation of Effective Swath Width for Dual-Head Multibeam Echosounder

Grządziel, Artur; Wąż, M.

doi:10.1515/aon-2016-0012

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…Of all the measurement methods other than hydroacoustic, Airborne Laser Scanning (ALS) [4] deserves a special mention. It is similar in terms of the swath width to the surveys carried out by the MBES [5].…”

Section: Introductionmentioning

confidence: 53%

Analysis of Methods for Determining Shallow Waterbody Depths Based on Images Taken by Unmanned Aerial Vehicles

Specht¹,

Wiśniewska²,

Stateczny

et al. 2022

Sensors

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Hydrographic surveys enable the acquisition and processing of bathymetric data, which after being plotted onto nautical charts, can help to ensure safety of navigation, monitor changes in the coastal zone, and assess hydro-engineering structure conditions. This study involves the measurement of waterbody depth, identification of the seabed shape and geomorphology, the coastline course, and the location of underwater obstacles. Hydroacoustic systems mounted on vessels are commonly used in bathymetric measurements. However, there is also an increasing use of Unmanned Aerial Vehicles (UAV) that can employ sensors such as LiDAR (Light Detection And Ranging) or cameras previously not applied in hydrography. Current systems based on photogrammetric and remote sensing methods enable the determination of shallow waterbody depth with no human intervention and, thus, significantly reduce the duration of measurements, especially when surveying large waterbodies. The aim of this publication is to present and compare methods for determining shallow waterbody depths based on an analysis of images taken by UAVs. The perspective demonstrates that photogrammetric techniques based on the SfM (Structure-from-Motion) and MVS (Multi-View Stereo) method allow high accuracies of depth measurements to be obtained. Errors due to the phenomenon of water-wave refraction remain the main limitation of these techniques. It was also proven that image processing based on the SfM-MVS method can be effectively combined with other measurement methods that enable the experimental determination of the parameters of signal propagation in water. The publication also points out that the Lyzenga, Satellite-Derived Bathymetry (SDB), and Stumpf methods allow satisfactory depth measurement results to be obtained. However, they require further testing, as do methods using the optical wave propagation properties.

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Section: Introductionmentioning

confidence: 53%

Analysis of Methods for Determining Shallow Waterbody Depths Based on Images Taken by Unmanned Aerial Vehicles

Specht¹,

Wiśniewska²,

Stateczny

et al. 2022

Sensors

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“…Recently, dual-head MBESs have become more prevalent and offer greater effective swath widths than traditional MBESs and can have multiple frequencies of reflectivity backscatter data (Grządziel and Wąż 2016;Eleftherakis et al 2018). Grządziel and Wąż (2016) reported effective swath widths for dual-head MBES to be as high as 7.5:1 in 12 m of water, which is the shallowest operational depth reported in the study. This is approximately double the effective swath width typically reported for traditional MBES; however, lower operating frequency MBES (100-400 kHz) were used in those studies, which would increase attainable swath width in deeper waters.…”

Section: Introductionmentioning

confidence: 67%

“…The low effective swath widths of MBESs, typically 3:1 to 4:1, have been a prohibitive drawback when mapping shallow waters (Grządziel and Wąż 2016). Recently, dual-head MBESs have become more prevalent and offer greater effective swath widths than traditional MBESs and can have multiple frequencies of reflectivity backscatter data (Grządziel and Wąż 2016;Eleftherakis et al 2018). Grządziel and Wąż (2016) reported effective swath widths for dual-head MBES to be as high as 7.5:1 in 12 m of water, which is the shallowest operational depth reported in the study.…”

Section: Introductionmentioning

confidence: 99%

Vessel-Based, Shallow Water Mapping with a Phase-Measuring Sidescan Sonar

Borrelli

Smith

Mague

2021

Estuaries and Coasts

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Coastal areas have traditionally been difficult locations to collect consistent, high-resolution bathymetric data via vessel-based acoustic surveys. The use of phase-measuring sidescan sonar is becoming more prevalent, particularly in shallow (< 20 m) coastal waters. Instruments used in the field over the last decade by the lead author are discussed here. This work is intended to serve as an introduction to the coastal scientist interested in the operation, use, and data sets associated with these instruments. Hydrographers unfamiliar with phase-measuring sidescan sonar will also benefit from insights regarding survey planning, data acquisition, and processing. These instruments collect co-located sidescan backscatter and swath bathymetry. The effective bathymetric swath widths can be 2 to 3 times that of multibeam echosounders making phase-measuring sidescan sonars ideal for shallow water mapping operations. These large effective swath widths offset the high levels of noise and processing needed in these bathymetric data sets relative to multibeam data. The sidescan backscatter and bathymetric data sets can be used individually, but the co-location allows for uses and analyses not feasible with other data sets. These instruments are well-suited to collect data for a suite of seafloor mapping projects and science-based investigations. Examples from a wide range of projects are detailed here for the shallow water mapping community and the multi-disciplinary groups who may benefit from the data and insights presented here.

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“…An angular swath coverage used was 140 • . The array lengths used in an EM3002D result in 1.5 • by 1.5 • beams at broadside [31]. The system sonar frequency was nominally 300 kHz.…”

Section: Mapping the Shipwreck-sitementioning

confidence: 99%

Using Remote Sensing Data to Identify Large Bottom Objects: The Case of World War II Shipwreck of General von Steuben

Grządziel

2020

Geosciences

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The seabed of the Baltic Sea is not yet fully searched for and investigated. In 2004 the crew of the Polish Navy hydrographic ship Arctowski discovered a new shipwreck that was not listed in the official underwater objects database nor was it marked on a chart. The identity of a new wreck is most frequently established based on artefacts found in the object by divers as a part of archaeological research, or through underwater inspection with remotely operated vehicle. The aim of this paper is to show how acoustic remote sensing data is used to identify large bottom object without having to go underwater. Bathymetric survey and sonar investigation were conducted over the study area. An appropriate methodology allowed for obtaining high-resolution imagery of the wreck. A review of literature concerning the end of World War II in the Baltic Sea was carried out. Moreover, the author presents a comparative analysis and evaluation of remote sensing data with archival photos, silhouette, and ship characteristics. The proposed approach led to the identification of a new Baltic Sea wreck as the General von Steuben, which was torpedoed in 1945 by soviet submarine. The author’s findings show that state of preservation of the shipwreck, quality data as well as historical records play a key role in establishing the wreck’s identity.

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Estimation of Effective Swath Width for Dual-Head Multibeam Echosounder

Cited by 12 publications

References 7 publications

Analysis of Methods for Determining Shallow Waterbody Depths Based on Images Taken by Unmanned Aerial Vehicles

Analysis of Methods for Determining Shallow Waterbody Depths Based on Images Taken by Unmanned Aerial Vehicles

Vessel-Based, Shallow Water Mapping with a Phase-Measuring Sidescan Sonar

Using Remote Sensing Data to Identify Large Bottom Objects: The Case of World War II Shipwreck of General von Steuben

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