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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.

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Presentation on theme: "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."— Presentation transcript:

1 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 1 24106 Kiel Germany Phone: +49 431 5 80 81 80 www.generalacoustics.com Info@generalacoustics.com ADCP‘s in the Hydrometry; Koblenz, 28./29.09.05

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

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

4 GENERAL ACOUSTICS GmbH © Building up the data base Preparing the calculations Executing the calculations, visualisation of the results 1 2 3 3 Steps to the result Evaluation with LOG_aFlow®

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

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

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

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

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

10 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

11 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

12 GENERAL ACOUSTICS GmbH © Measuring data

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

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

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

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

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

18 GENERAL ACOUSTICS GmbH © Result of calculation (Example)

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

20 GENERAL ACOUSTICS GmbH © Visualisation

21 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

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