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Use of time series and harmonic constituents of tidal propagation to enhance estimation of coastal aquifer heterogeneity

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Abstract

A synthetic two‐dimensional model of a horizontally and vertically heterogeneous confined coastal aquifer system, based on the Upper Floridan aquifer in south Florida, USA, subjected to constant recharge and a complex tidal signal was used to generate 15‐minute water‐level data at select locations over a 7‐day simulation period.   “Observed” water‐level data were generated by adding noise, representative of typical barometric pressure variations and measurement errors, to 15‐minute data from the synthetic model. Permeability was calibrated using a non‐linear gradient‐based parameter inversion approach with preferred‐value Tikhonov regularization and 1) “observed” water‐level data, 2) harmonic constituent data, or 3) a combination of “observed” water‐level and harmonic constituent data.    In all cases, high‐frequency data used in the parameter inversion process were able to characterize broad‐scale heterogeneities; the ability to discern fine‐scale heterogeneity was greater when harmonic constituent data were used.  These results suggest that the combined use of highly parameterized‐inversion techniques and high frequency time and/or processed‐harmonic constituent water‐level data could be a useful approach to better characterize aquifer heterogeneities in coastal aquifers influenced by ocean tides.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Use of time series and harmonic constituents of tidal propagation to enhance estimation of coastal aquifer heterogeneity
Year Published 2010
Language English
Publisher Wechselnde Verlagsorte
Contributing office(s) Florida Water Science Center-Ft. Lauderdale
Description 4 p.
Larger Work Type Conference Paper
Larger Work Title SWIM21 – 21st Salt Water Intrusion Meeting Proceedings Book
First page 329
Last page 332
Conference Title 21st Salt Water Intrusion Meeting (SWIM21 – AZORES 2010)
Conference Location Azores, Portugal
Conference Date June 21-26, 2010
Online Only (Y/N) N
Additional Online Files (Y/N) N