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Open AccessArticle

Applicability of a Recreational-Grade Interferometric Sonar for the Bathymetric Survey and Monitoring of the Drava River

1
University of Pécs, Faculty of Sciences, Institute of Geography and Earth Sciences, 7624 Pécs, Ifjúság útja 6., Hungary
2
University of Pécs, Faculty of Sciences, Doctoral School of Earth Sciences, 7624 Pécs, Ifjúság útja 6., Hungary
3
General Directorate of Water Management, Hungarian Hydrological Forecasting Service, 1012 Budapest, Márvány u. 1/d., Hungary
*
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2020, 9(3), 149; https://doi.org/10.3390/ijgi9030149
Received: 28 January 2020 / Revised: 22 February 2020 / Accepted: 27 February 2020 / Published: 5 March 2020

Sonar survey of shallow water bodies has challenged scientists for a long time. Although these water courses are small, still they have an increasing ecological, touristic and economical role. As maritime sonars are non-ideal tools for shallow waters, the bathymetric survey of these rivers has been taken with cross-sectional methods. Due to recent developments, interferometric surveying technology have also burst into the market of recreational-grade fish-finders. The objective of the current study was the development of a novel, complex and integrated surveying technique which is affordable, robust and applicable even at low water levels. A recreational-grade sonar system was assembled and mounted on a double-hull vessel and connected with a geodetic Global Navigation Satellite System (GNSS) device. We have developed a novel software which enables the bridging between a closed sonar file format and the commonly used Geographic Information System (GIS) datasets. As a result, the several month-long conventional bathymetric survey of the 146 km-long reach of the Drava River was reduced to 20 days and provided channel bathymetry of many orders of magnitude higher than the classical methods. Additionally, a large number of spatial derivatives were generated which enables the analysis of channel morphology, textural variation of channel sediments and the accurate delineation of navigational routes. View Full-Text
Keywords: remote sensing; active sonar; bathymetry; interferometry; recreational-grade sonar; fish finder; Drava River remote sensing; active sonar; bathymetry; interferometry; recreational-grade sonar; fish finder; Drava River
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Halmai, Á.; Gradwohl–Valkay, A.; Czigány, S.; Ficsor, J.; Liptay, Z.Á.; Kiss, K.; Lóczy, D.; Pirkhoffer, E. Applicability of a Recreational-Grade Interferometric Sonar for the Bathymetric Survey and Monitoring of the Drava River. ISPRS Int. J. Geo-Inf. 2020, 9, 149.

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