Computational Techniques for Tidal Datums Handbook PDF Download
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Author:
Publisher:
ISBN:
Category : Tides
Languages : en
Pages : 116
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Book Description
Author:
Publisher:
ISBN:
Category : Tides
Languages : en
Pages : 116
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Book Description
Author:
Publisher:
ISBN:
Category : Tides
Languages : en
Pages : 113
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Book Description
Author: Robert Lawrence Swanson
Publisher:
ISBN:
Category : Sea level
Languages : en
Pages : 52
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Book Description
Author: Chenglin Gan
Publisher:
ISBN:
Category : Tides
Languages : en
Pages : 72
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Book Description
Author: U.S. Coast and Geodetic Survey
Publisher:
ISBN:
Category : Bench-marks
Languages : en
Pages : 152
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Book Description
Author: Stephen K. Gill
Publisher:
ISBN:
Category : Sea level
Languages : en
Pages : 58
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Book Description
"NOAA has typically updated tidal datum elevations for the nation to new National Tidal Datum Epoch (NTDE) time periods every 20-25 years. Updates at this frequency are necessary due to long-term global sea level change. In 1998, NOS recognized the need for a modified procedure that utilized more frequent time period updates, for determination of tidal datums for regions with anomalously high rates of local relative sea level change. These localized effects in relative sea level trends are typically due to different forces other than those responsible for global trends which can vary significantly from global trends in both time scales and magnitude. This modified procedure is necessary at selected stations to ensure that the tidal datums accurately represent the existing stand of sea level relative to land on which these datums are held fixed. Bench mark monuments are typically used as reference points for numerous applications requiring tidal datum references. The modified procedure is limited only to those stations with documented anomalous relative sea level trends due to high rates of vertical land motion. Anomalous relative sea level trends are seen along the central Louisiana, the southern Cook Inlet, and the southeastern Alaska coasts. For example, the magnitude of the sea level trends in these areas are +9.24 mm/yr at Grand Isle, LA; -9.45 mm/yr at Seldovia, AK; and -12.92 mm/yr at Juneau, AK. Following the first implementation of the modified procedure in 1998, using the time series for tidal datum computation of 1990-1994, sea level analyses in these anomalous regions are now conducted approximately every five (5) years to identify stations that require datum updates using the modified procedure...The purpose of this technical report is to document the Modified Procedure that has been used by CO-OPS to compute accepted tidal datums for selected regions having anomalously high rates of local relative sea level change. Additionally, the report provides an update on near-term plans for continuing to implement the procedure"--Executive Summary.
Author: Harry Aaron Marmer
Publisher:
ISBN:
Category : Earth tides
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Boundaries
Languages : en
Pages : 48
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Author: Michael F. P. Michalski
Publisher:
ISBN:
Category : Error analysis (Mathematics)
Languages : en
Pages : 20
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"NOAA has an established National Water Level Observation Network (NWLON) along all U.S. coastlines. One purpose of the NWLON is to provide control for tidal datum determination at short-term water level stations installed for hydrographic and shoreline mapping surveys. There are significant gaps in NWLON coverage in Alaska. When short-term (1-12 months) water level stations are installed outside of an NWLON coverage area, a First Reduction (FRED) or arithmetic mean is used for datum determination instead of the preferred simultaneous comparison method that uses a nearby NWLON station to compute a 19-year equivalent National Tidal Datum Epoch (NTDE) datum. The datum error of a FRED is typically greater than the error computed by a simultaneous comparison procedure with an NWLON station. This report describes one method used by NOAA to establish error bounds on FRED tidal datums computed at short-term stations. The standard deviation of monthly Mean Tide level (MTL) at 29 operating and historical water level stations in Alaska with varying time series lengths was used to infer FRED datum errors within the study region. The combined results show that FRED datum errors decrease from 0.120 m, to 0.040 m and 0.008m (one-sigma) for 1, 12, and 228 month time series, respectively. Comparisons across the region show only minor statistical differences, supporting the use of combined values as representing FRED datum errors for the entire study area. These results will help facilitate better estimates of total tide-propagated error and better planning of required subordinate installation time series length in support of hydrographic and shoreline mapping surveys in Alaska"--Executive Summary.
Author:
Publisher: Department of Interior Bureau of Land Management
ISBN:
Category : Law
Languages : en
Pages : 517
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Book Description
