Mapping Small-Scale Horizontal Velocity Field in Panzhinan Waterway by Coastal Acoustic Tomography

Mapping Small-Scale Horizontal Velocity Field in Panzhinan Waterway by Coastal Acoustic Tomography

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Mapping small-scale high-precision velocity fields is of great significance to oceanic environment research.Coastal acoustic tomography (CAT) is a frontier technology used to observe large-scale velocity field in the horizontal slice.Nonetheless, it is difficult to observe the velocity field using the CAT in small-scale areas, specifically where the flow field is complex such as ocean ranch and artificial upwelling areas.This paper conducted a sound transmission experiment using four 50 kHz CAT systems in the Panzhinan waterway.

Notably, sound transmission based on the round-robin method was recommended for small-scale CAT observation.The travel time between stations, 2 Piece Modular Sectional obtained by correlation of raw data, was applied to reconstruct the horizontal velocity fields using Tapered Least Square inversion.The minimum net volume transport was 8.7 m3/s at 12:32, 1.

63% of the total inflow volume transport indicating that the observational errors were acceptable.The relative errors of the range-average velocity Lower Console Keyboard calculated by differential travel time were 1.54% (path 2) and 0.92% (path 6), respectively.

Moreover, the inversion velocity root-mean-square errors (RMSEs) were 0.5163, 0.1494, 0.2103, 0.

2804 and 0.2817 m/s for paths 1, 2, 3, 4 and 6, respectively.The feasibility and acceptable accuracy of the CAT method in the small-scale velocity profiling measurement were validated.Furthermore, a three-dimensional (3-D) velocity field mapping should be performed with combined analysis in horizontal and vertical slices.