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NP122(1) Admiralty Tide Handbook No. 1, 1985
*** Canceled, with no replacement on 8 Jun 2017
ISBN: 978-0-70-772-1125 (9780707721125)
| Admiralty Chart Catalogue | Admiralty Publications | |
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NP122(1) Admiralty Tide Handbook No. 1, 1985 - The Admiralty Method Of Harmonic Tidal Analysis For Long Period Obsevations
NP 112 was revised in 1982. It now consists of Part (a) containing the Plotting Sheet and Astronomical Calculations and Part (b) - a booklet containing the remainder of the calculation. There are many minor changes in layout to facilitate calculation but the most significant are sections allowing calculation of Long Term, Third-Diurnal and Sixth-Diurnal Species and inclusion of a section for obtaining Shallow Water Corrections in the form required for the Simplified Harmonic Method of Prediction (NP 159).
The present revision of this handbook takes account of these changes and also includes new chapters on the use of computers and the combining of a series of 30 Day analyses over a period of about a year to obtain a greater number of more accurate constituents.
The revision of both form and handbook was carried out by Lieutenant Commander A G Merriman MNI RN (Retd).
| Contents | ||
| Preface | ii | |
| Contenets | iii-iv | |
| Introduction | v | |
| Chapters: | ||
| 1 | Brief Summary of Relevant Tidal Theory and Tidal Terms in Common Use | 1 |
| 2 | The Semi-Graphic Analysis- Brief Summary | 11 |
| 3 | Graphical Construction of the 'Tidal Surface' and Smoothing of the Original Observations | 12 |
| 4 | Separation of Different Species | 24 |
| 5 | Selection of Position and Number of Columns | 32 |
| 6 | Computerised Solution of the Plotting Sheet | 34 |
| 7 | Separation of Constituents of the Same Species | 46 |
| 8 | Corrections Due to Minor Constituents | 57 |
| 9 | Long Term Constituents and Mean Level | 72 |
| 10 | Shallow Water Corrections | 75 |
| 11 | The Annual Grouping Method of Analysis of Tide Readings Over a Period of About a Year | 79 |
| 12 | Tidal Streams | 89 |
| 13 | Use of Electronic Computers | 94 |
| Tables: | ||
| 1 | List of Constituents Derived by the Methods in this Handbook | 102 |
| 2 | Nodal Corrections u and f | 104 |
| 3 | Speeds and Phase Change of Constituents | 105 |
| 4 | Derivation of Short Term Stencils | 106 |
| 5 | Co-ordinates of Central Times of Columns | 107 |
| 6-12 | Derivation of Multiplication Tables | 108 |
| 13 | Minor Constituents and Close Pair Relationships | 110 |
| 14 | Relative Phases and Trig Functions for Minor Constituents | 111 |
| 15 | Contributions of Minor Constituents | 112 |
| 16 | Long Term Stencils | 113 |
| 17 | Annual Grouping Method - List of Recommended Dates | 114 |
| Appendices: | ||
| A | The Principle of Least Squares | 115 |
| B | Astronomical Arguments | 118 |
| C | Flow Chart for Computed Selected Heights | 121 |
| D | Summary of Formulae for Computed Selected Heights | 122 |
| E | Manual Example of Computed Selected Heights | 124 |
| F | Example Calculation of Shallow Water corrections by Extreme Springs Method | 125 |
| G | Specimen Form for Calculation of Shallow Water Corrections by Extreme Spring Method | 126 |
| H | Annual Grouping Method - Example of Secondary Calculation | 127 |
| J | Annual Grouping Method - Example of Tertiary Calculations for 1 Month | 128 |
| K | Limits of Speeds and Separation of Constituents for a Series of Observations - Rayleigh's Criterion | 130 |
| L | Examples | 133 |
