Multi-transducer sediment echo sounder
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1 Multi-transducer sediment echo sounder Presented at the FIG Working Week 2017, May 29 - June 2, 2017 in Helsinki, Finland for 3D documentation of submerged archaeological sites - a case study at a prehistoric pile dwelling at Lake Mondsee (Austria) Erwin Heine Institute of Surveying, Remote Sensing and Land Information (IVFL) University of Natural Resources and Life Sciences, Vienna AUSTRIA
2 Multi-transducer sediment echo sounder for 3D documentation of submerged archaeological sites - a case study at a prehistoric pile dwelling at Lake Mondsee (Austria)
3 Introduction Detection and mapping of submerged and the buried archaeological remains Parametric Sub Bottom Profiler (SBP) well established in archaeological prospection 2D Multi-transducer Parametric Sub-Bottom Profiler 3D investigation High end Multi beam echosounder Kongsberg, Reson, R2Sonic Case study: prehistoric pile dwelling at Lake Mondsee
4 prehistoric pile dwelling See at Lake Mondsee (Austria) Reconstruction of site Kammern (Lake Attersee) Foto: Henrik Pohl, Kuratorium Pfahlbauten,
5 Test environment Test sites R1 - R3: different water depth (1m 65m) different topography (rough, smooth, flat area) Sensors Positioning and Motion: HYDRINS (ixblue); AsteRx-U (Septentrio); GS25 (Leica) Multibeam Echo Sounder (MBES): EM2040C (Kongsberg), Sonic 2024 (R2Sonic), SeaBat T50-P (Teledyne Reson) Sediment Echo Sounder: Parametric Sub-Bottom-Profiler SES-2000 Quattro (Innomar) Data acquisition, navigation and processing: QINSy (QPS) & manufacturer SW
6 Multi beam measurements (region 3 & 2) region R3: prospection of unexplored lake portions incl. low quality backscatter and water column data (WCI) provide further justification to conduct detailed prospection (towed SSS ) region R2: evaluate the data quality of the outer beams in relation to water depth and swath angle Critical outer beam zones due to wide swath angle (white doted lines) MBES backscatter information
7 Multi beam measurements (region 1) 3 areas: different natural and manmade objects, trenches and remains of wooden piles of the prehistoric settlement Acquisition: different frequencies, different swath angles and from different directions by sailing along perpendicular tracks
8 Multi beam measurements (region 1) Multi-Detect feature of MBES: provides multiple detections within each beam a pile sticking out of the ground may be represented by several points out of one beam
9 Parametric sub-bottom profiler (SBP) measurements detection of embedded objects, i.e. buried remains of piles Θ 5 at depth 3m footprint Ф 0,24m Additional information needed to associate signal reflection to structures Cores arquaeological section (trench) Volumetric SBP information
10 Multi-transducer parametric SBP SES-2000 Quattro of Innomar 4 individual SBP transducer distance: 25 cm
11 Voxel model of the lake bed of the prehistoric pile dwelling 40 tracks of 120 m length sailed (160 sub bottom profiles) 25 cm across track distance Voxel-Modell XYZA grid of 12,5cm x 12,5cm x 1cm
12 3D interpretation of structures and embedded objects: time slices applying clip planes at different heights
13 3D interpretation of structures and embedded objects: dynamic visualization lake bed of the prehistoric pile dwelling See
14 Conclusion multi-transducer sub-bottom-profiler is able to provide detailed and accurate information of structures and objects embedded in sediments resulting voxel model offers possibilities for 3D acoustic investigation of the sediment submerged archaeological sites
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