La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Evaluation of a digital echo sounder system for detection of submersed aquatic vegetation
Auteurs :	B. M. Sabol, Auteur ; R. E. Melton, Auteur ; R. Chamberlain, Auteur ; P. Doering, Auteur ; K. Haunert, Auteur
Type de document :	Article
Dans :	Estuaries (25(1) FEB 2002)
Article en page(s) :	133-141
Résumé :	A technique is presented for rapid detection of submersed aquatic vegetation (SAV) using a high-frequency, high-resolution digital echo sounder linked with global positioning system equipment. The acoustic reflectivity of SAV allows for detection and explicit measurement of canopy geometry using a digital signal processing algorithm described here. Comparing output data from this system with physical measurements shows good detection and measurement performance over a wide range of conditions for freshwater tape grass (Vallisneria americana) and seagrasses (Thalassia testudinum, Halodule wrightii, and Syringodium filiforme) in a sandy-bottom, south Florida estuary. The range of environmental conditions for which the system can be used is defined. Based on these measured performance data and a review of existing literature, this system appears to fill a gap in the inventory of established methods for measuring the distribution and abundance of submersed macrophytes.

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