GENERAL ACOUSTICS GmbH © Method for the ADCP-Data Evaluation for Synoptic 3-D-Current Investigations Dr.-Ing. Volker Müller General Acoustics GmbH Am Kiel-Kanal.

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GENERAL ACOUSTICS GmbH © Method for the ADCP-Data Evaluation for Synoptic 3-D-Current Investigations Dr.-Ing. Volker Müller General Acoustics GmbH Am Kiel-Kanal Kiel Germany Phone: ADCP‘s in the Hydrometry; Koblenz, 28./

GENERAL ACOUSTICS GmbH © Planning the Current Survey Goal, Experience values with/without Data

GENERAL ACOUSTICS GmbH © Execution of the Current Survey Quality ?!

GENERAL ACOUSTICS GmbH © Building up the data base Preparing the calculations Executing the calculations, visualisation of the results Steps to the result Evaluation with LOG_aFlow®

GENERAL ACOUSTICS GmbH © Data basis: Geodesy (geogr. reference)

GENERAL ACOUSTICS GmbH © Data basis: Level curve (time reference)

GENERAL ACOUSTICS GmbH © Data basis: Topography (2-D boundary)

GENERAL ACOUSTICS GmbH © Data basis: ADCP-Measuring data (*.lad)

GENERAL ACOUSTICS GmbH © Data basis: Preprocessing of ADCP-Data ?

GENERAL ACOUSTICS GmbH © Problem synoptisc view complete area, defined point in time unsynchronised ADCP-Data Result synoptisc current view discrete time; complete area software LOG_aFlow ® Physical Model Limiting to depth averaged data (2-D approximation) LOG_aFlow ® - hydrodynamisc ADCP – Data interpolation in space and time Theory I - Basics

GENERAL ACOUSTICS GmbH © Preparing of the ADCP – Data for the 2D Approximation – RdiToLaf Data check regarding: Continuity Conformity w << {u, v} Quality and Error value (Error speed) per depth cell Theory II – Data quality

GENERAL ACOUSTICS GmbH © Measuring data

GENERAL ACOUSTICS GmbH © Quality parameter (single ping, per depth cell)

GENERAL ACOUSTICS GmbH © ‚Error speed‘ (single ping, per depth cell)

GENERAL ACOUSTICS GmbH © Measuring values (depth /layer averaged)

GENERAL ACOUSTICS GmbH © Fixing calculation grid (time/location)

GENERAL ACOUSTICS GmbH © Setting ‚degree‘ of depth averaging Recommendation : Averaging only with depth cell range

GENERAL ACOUSTICS GmbH © Result of calculation (Example)

GENERAL ACOUSTICS GmbH © 3D synoptisc result of an ADCP survey

GENERAL ACOUSTICS GmbH © Visualisation

GENERAL ACOUSTICS GmbH © Summary LOG_aFlow® is an easy to handle software, which quickly and accurately generates flow charts and additionally executes a quality check of the ADCP data