Patchy Distribution Fields: An Interleaved Survey Design and Reconstruction Adequacy |
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Authors: | I Kalikhman |
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Institution: | (1) Yigal Allon Kinneret Limnological Laboratory, Israel Oceanographic and Limnological Research Ltd., Tel-Shikmona, Haifa, Israel |
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Abstract: | A mathematical model was used to compare the effects of a regular (one-pass) or interleaved (two-pass) acoustic survey on
the adequacy of reconstructing patchy distribution fields. The model simulates fish or plankton patches of different shapes
and spatial orientations, and a set of parallel or zigzag transects forming a regular or interleaved acoustic survey. The
efficiency of a survey is determined by the adequacy of a reconstructed field to that originally generated, which is evaluated
by calculating their correlations. Regarding the immovable fields, the efficiency of a regular or interleaved acoustic survey
was tested with the following two alternative assumptions: (1) the entire survey was completed; (2) the survey was interrupted
for some reason at the moment when one transect remained non-accomplished. In the former case, the efficiencies of both acoustic
surveys were nearly the same; in the latter case, the efficiency of an interleaved survey was superior to that of a regular
one. With respect to movable fields, the efficiency of the completed interleaved surveys was even higher than that of the
regular ones. Thus, the results obtained allow us to conclude that an interleaved survey is expedient in cases where there
is no preference regarding the position of a vessel for further work. |
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Keywords: | acoustic survey adequacy anisotropy autocorrelation radius coefficient of determination design efficiency interleaved survey mathematical simulation patch reconstruction |
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