SIDE SCAN SONAR (SSS)

Transcription

1 SIDE SCAN SONAR (SSS) BENTOS Servicios y Equipos Marinos Ltda. Avda. Suecia 3005, Ñuñoa, Santiago Telephone: (56 2) Fax: (56 2) info@bentos.cl

2 THE SIDE SCAN SONAR (SSS), WHAT IT IS The SSS system, developed to create acoustic images of large areas of the surface of the marine bottom, consists of one of the variants of the original SONAR (SOund Navigation And Range) system, which searches the water column at high frequency (usually between khz) by means of acoustic scanning to the side and orthogonally in respect with the line of navigation. The restitution of the acoustic images makes it possible to perform the mapping and characterization of bottom cover, the detection of objects or obstacles for navigation, inspections of submerged structures, exploration of shipwreck remains, the monitoring and inspection of maritime and port constructed works and submarine cables and pipelines (Benabdeloued et al., 2010). BENTOS has the model 872 YellowFin SSS system by Imagenex, which operates on three frequencies: 260, 330 and 800 khz. Imagenex model 872 YellowFin SSS.

3 THE SSS SYSTEM, HOW IT FUNCTIONS Integrated on a tow fish structure, the sensor is towed with a communications cable linked to the control system on board the tow vessel. The general principal of functioning of the SBL system features the emission/receiving of acoustic waves through the transducers at a characteristic frequency and directed toward the marine bottom to insonify the surface of the marine soil in order to detect obstacles in the water column. The signal is reflected in intensities that are proportional to the impedance or acoustic absorption of the bottom cover. This trait makes it possible to detect objects and infer differences in the impedance and texture of the insonified bottom cover.

4 CHARACTERISTICS OF THE SSS SYSTEM The principal characteristic of SSS systems, including the Imagenex model 872 YellowFin system that BENTOS operates, is the detection of objects present on the marine soil surface which, in accordance with their reflective properties (depending primarily on their roughness, nature and relief features) and the acoustic shadows generated, make it possible to infer their textures and dimensions.

5 The characterization of the types of marine bottom surface covers have a wide range of applications in which the most requested include: reconnaissance of navigation hazards (rock outcrops and other obstacles), detection of objects on the surface (submarine cables and pipelines), submarine archeology (exploration of shipwrecks), support for geotechnical exploration work, studies of cover distribution, sediment transport and geologic features. Example of the detection of rocks and coarse sediment (boulders, gravel) located close to the coastline by means of the side scan sonar system.

6 Identification of a shipwreck by means of SSS acoustic imaging. Reconnaissance of waves in sand on the surface of the marine bottom by means of the SSS system.

7 Example of reconnaissance of the sedimentary nature of the marine ROCKY BOTTOM by means of the SSS system in the northern area of the Chacao Channel, Chile. SOFT BOTTOM CONTOUR LINES

8 Example of the detection by the SSS system of the light cruiser SMS Dresden, scuttled off shore from the coast of the Juan Fernández Archipelago, Chile.

9 Location of the shipwreck of the Corvette Esmeralda by means of the Imagenex 872 YellowFin in Iquique (BENTOS, 2010).

10 Three-dimensional representation of the levels of acoustic activity of the marine bottom with SonarWiz (Chesapeake), integrating SSS data (Imagenex 872 YellowFin) and bathymetric depths acquired by means of high-resolution multibeam technology (R2Sonic), Bahía de Concepción, Chile (BENTOS, 2013).

11 Identification of elements and state of conservation of a shipwreck.

12 Submarine detection by means of side scan sonar images and the sonar shadow projected on the marine bottom.

13 EXPERIENCE Official Multibeam Bathymetry, Marine Geophysics (Sub Bottom Profiler, Side Scan Sonar, Marine Magnetometry and Piston Corer), Puerto Lirquén, Bahía Concepción, Eighth Administrative Region. OCTOPUS LNG Project. GEOVENOR EXPLORA SpA Official Single Beam Bathymetry and Side Scan Sonar, Bahía Chapaco, Third Administrative Region, COMPAÑÍA MINERA DEL PACÍFICO S.A., (CAP-MINERÍA) Marine Geophysical Exploration, Mejillones, Second Administrative Region, Gas Atacama Project, GASATACAMA CHILE S.A., Marine Geophysical Exploration, First Administrative Region, Quebrada Blanca Project, Phase 2, COMPAÑÍA MINERA TECK QUEBRADA BLANCA S.A., Shallow Seismic Survey, Bulk Liquid Terminal Project, Electroandina, Second Administrative Region, Chile. EMPRESA CONSTRUCTORA BELFI, Official Single Beam Bathymetric Survey per the Hydrographic and Oceanographic Service of the Chilean Navy (SHOA), Caldera, Third Administrative Region, COMPAÑÍA CONTRACTUAL MINERA CANDELARIA, Exploratory and Side Scan Sonar Bathymetry, ASMAR (T) Harbor Basin Dredging Project, Talcahuano, Eighth Administrative Region, Chile. PRDW ALDUNATE VÁSQUEZ SERVICIOS LTDA., Archeological Exploration by Geophysical Means of the Corvette Esmeralda Sunk in 1879 at Iquique, First Administrative Region, Andrés Bello University, Chilean Navy and BENTOS, Marine Geophysics Single Beam Bathymetry and Side Scan Sonar Studies and Directional Wave Measurements, Puerto Eten, Chiclayo, Peru, LUMINA COPPER,

14 EXPERIENCE Submarine Power Cable Studies; Alignments in the Tenth and Eleventh Administrative Regions, Chile. TRANSELEC S.A., Marine Geophysics Studies (SBP), Single Beam Bathymetry, Side Scan Sonar, Directional Wave Measurements; Puerto Eten, Chiclayo, Peru, LUMINA COPPER, El Morro Water Desalination Plant Project, Third Administrative Region, HALCROW GROUP LTD. CHILE, AGENCIA EN CHILE, Marine Seismic Survey in Bahía Talcahuano, Eighth Administrative Region, GEOEXPLORACIONES S.A., Hydrography, Geophysics, Beach Line and Coastal Topography Studies, El Morro Water Desalination Plant Project, Third Administrative Region, Chile, HALCROW GROUP LTD. CHILE, Environmental Impact Declaration, Dredging to Deepen the Port and Material Extraction and Dredging Spoil Dump Area for Dock 2B of Puerto de Arica, TERMINAL PUERTO DE ARICA S.A., Study and Design for the Improvement and Maritime Connectivity of the Puerto Montt Chiloé Palena and Caleta La Arena and Caleta Puelche network, Tenth Administrative Region, PRDW AV PORT WORKS ADMINISTRATION (DOP), Marine Geophysics Studies with SHOA Approval, Puerto Yungay and Río Bravo, CENTRALES HIDROELÉCTRICAS DE AYSÉN S.A., Geophysical Exploration Study for the El Galeno Project, Pacasmayo, Peru, MTB PROFESSIONALS, Geophysical Study for the URUCU-MANAUS Gas Pipeline, Amazonas, Brazil, PLANAL SERVICOS DE ENGENHARIA, Consulting Services for a Submarine Routing Study Conceptual Definitions for a HVDC Aysén SIC Grid Transmission System, CENTRALES HIDROELÉCTRICAS DE AYSÉN S.A., 2008.

15 EXPERIENCE Geophysical Exploration, Melchorita LNG Project, Peru. JAN DE NUL, Geophysical Exploration, Punta Vegueta Area, Peru, TRAMARSA S.A., Geophysical Exploration of Isla Riesco, Twelfth Administrative Region, Chile, GOLDER ASSOCIATES SERVICES S.A., Reconnaissance of the Morphology of the Marine Bottom in the Zorritos Area, Tumbes, Peru, by means of the Use of Side Scan Sonar, Submarine Pipeline Project for Pipelining Gas, BPZ ENERGY INC., SUCURSAL PERÚ, SEHIDRO, Bathymetry and Side Scan Sonar Studies at Roca Remolinos and North Pylon Area, Chacao Channel, Tenth Administrative Region, Chile, EMPRESA CONSTRUCTORA BELFI S.A., Maritime, Wave, Current, Tide, Wind and Bathymetry Studies and underwater inspection for the Short Seismicresistant Dock for Post-Panamax Vessels, Berth 4 Project, Puerto de Iquique, First Administrative Region, Chile, IQUIQUE TERMINAL INTERNACIONAL S.A., Maritime, Wave, Current, Wind, Tide and Bathymetry Studies, Side Scan Sonar and Magnetometry. International Concession for the Bridge over the Chacao Channel. Maritime and Wind Studies, Chacao, Tenth Administrative Region, Chile. Ministry of Public Works, CONSORCIO INGENIERÍA CUATRO LTDA. & COWI ENGINEERS AND PLANNERS (DENMARK),