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Computational Techniques for Tidal Datums Handbook

By National Oceanic and Atmospheric Administration

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Book Id: WPLBN0000693575
Format Type: PDF eBook
File Size: 2.32 MB.
Reproduction Date: 2005

Title: Computational Techniques for Tidal Datums Handbook  
Author: National Oceanic and Atmospheric Administration
Volume:
Language: English
Subject: Science., Ecology & environment, National Oceanic and Atmospheric Administration (U.S.)
Collections: National Oceanographic Data Center
Historic
Publication Date:
Publisher: Government Reference Publication

Citation

APA MLA Chicago

And Atmospheric Administration, N. O. (n.d.). Computational Techniques for Tidal Datums Handbook. Retrieved from http://worldebooklibrary.com/


Excerpt
Excerpt: Intended Audience. This handbook is intended to provide education and training for both internal and external audiences to NOAA. It presents the National Ocean Service (NOS) methodology for computation of tidal datum and explains how to use the Center for Operational Oceanographic Products and Services (CO-OPS) water level data and bench mark information available on internet for tidal datum computations. Fundamental background for tide measurement and processing is also reviewed. Detailed descriptions of tidal datum procedures, the background mathematical formulas, and example spreadsheets are interwoven in the various sections.

Table of Contents
TABLE OF CONTENTS page 1. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Statement of Philosophy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Prerequisite Knowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. BACKGROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1 Characteristics of the Tides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Lunitidal Interviews . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Other Signals in Water Level Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Tide Station Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.5 Bench Marks and Differential Leveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.6 Data Processing Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.7 The National Tidal Datum Epoch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 3. GENERAL TIDAL DATUM COMPUTATION PROCEDURES 3.1 Datum Computation Procedures Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.2 Other Vertical Datums and Their Relationship to Tidal Datums . . . . . . . . . . . . 20 3.3 Steps required to Compute Tidal Datums at Short-term Stations . . . . . . . . . . . . 25 3.4 Datum Computation Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Standard Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Modified Range Ratio Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Direct Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.5 Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4. WORKED EXAMPLES OF TIDAL DATUMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.1 Procedural Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.2 Comparison of Monthly Means . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.2.1 Modified Range Ratio Method - Semidiurnal Tides . . . . . . . . . . . . . . . . 31 Definition, MTL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Definition, DTL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Definition, Mn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Definition, Gt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Definition, DHQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Definition, DLQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.2.2 Modified Range Ratio Method - Diurnal Tides . . . . . . . . . . . . . . . . . . . . 40 Corrected MTL for Panama City Beach . . . . . . . . . . . . . . . . . . . . . . . . . 43 Corrected DTL for Panama City Beach . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Corrected Mn for Panama City Beach . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Corrected Gt at Panama City Beach . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 4.2.3 Standard Method - Mixed Tides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Corrected MTL at Alameda . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

 

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