Authors: Lars Lund-Hansen¹; Einer Larsen¹; Kurt Jensen¹; Kim Mouritsen¹; Christian Christiansen²; Thorbjrn Andersen²; Gunnild Vlund²

Source: Marine Georesources and Geotechnology, Volume 22, Numbers 1-2, Numbers 1-2/January–June 2004 , pp. 115-122(8)

Publisher: Taylor and Francis Ltd

Abstract:

A newly developed video and camera system for tidal flat microtopographic studies is presented. It consists of a SONY handy cam placed in an underwater housing mounted on a frame about 70 cm above the sediment surface. A rectangular surface area of 30 0 cm is imaged by the camera. The camera records video sequences and/or digital images at predetermined time lapses. The total number of images is about 540, and a similar number of 10-second long video sequences can be recorded. The camera is programmed with a PC before deployment, and the total deployment time depends on the time lapse between recordings. The camera is connected to an external power supply (12 volt), and a halogen projector pointing towards the sediment surface ensures that the system is operable on a 24-hours scale. The system has been tested in the Danish Wadden Sea. It has proved to be a very useful tool in studies of topographic effects of erosion and deposition sequences, and for studies of benthic organisms-sediment interactions. The test site was further equipped with sensors for water and seabed measurements, which proved to be indispensable regarding the interpretation of recorded image time-series.

Keywords: digital imagery; microtopography; long-term measurements; tidal flats

Document Type: Research article

DOI: http://dx.doi.org/10.1080/10641190490473443

Affiliations: 1: Marine Ecology, Biological Institute Aarhus University, hus, Denmark hus, Denmark "> 2: Institute of Geography, University of Copenhagen, ter Copenhagen, Denmark

Publication date: 2004-01-01

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