NP122(1) Admiralty Tide Handbook No. 1, 1985


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*** 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).

Preface   ii
Contenets   iii-iv
Introduction   v
1  Brief Summary of Relevant Tidal Theory and Tidal Terms in Common Use
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 
 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
 List of Constituents Derived by the Methods in this Handbook 102 
2  Nodal Corrections u and f 104 
 Speeds and Phase Change of Constituents 105 
 Derivation of Short Term Stencils 106
 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 
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
 Examples 133 


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