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Tuesday, April 28, 2020 | History

2 edition of response to tidal fluctuations of two non-homogeneous coastal aquifer models found in the catalog.

response to tidal fluctuations of two non-homogeneous coastal aquifer models

John Arthur Williams

response to tidal fluctuations of two non-homogeneous coastal aquifer models

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  • 20 Currently reading

Published by Water Resources Research Center, University of Hawaii] in [Honolulu .
Written in English

    Subjects:
  • Aquifers -- Mathematical models.,
  • Aquifers -- Electromechanical analogies.,
  • Groundwater flow -- Mathematical models.,
  • Groundwater flow -- Electromechanical analogies.,
  • Tides -- Mathematical models.

  • Edition Notes

    Statementby John A. Williams and Ta-Chiang Liu.
    Series[Hawaii. University, Honolulu. Water Resources Research Center] Technical report, no. 51, Technical report (University of Hawaii (Honolulu). Water Resources Research Center) ;, no. 51.
    ContributionsLiu, Ta-Chiang, joint author.
    Classifications
    LC ClassificationsTC1 .H36 no. 51, GB665 .H36 no. 51
    The Physical Object
    Paginationvii, 70 p.
    Number of Pages70
    ID Numbers
    Open LibraryOL5393993M
    LC Control Number72611447

    Tide-induced groundwater fluctuation in a coastal leaky confined aquifer system extending under the sea Hailong Li1 and Jiu J. Jiao Department of Earth Sciences, University of Hong Kong, Hong Kong, China Abstract. This paper presents the analytical solution of groundwater response to tidal fluctuation in a coastal multilayer aquifer system. 1. Introduction. Coastal aquifers are fragile in nature, as they constitute a freshwater source which usually lies on top of seawater with a transition zone in between the two water types [].These aquifers are generally in direct contact with seawater, which create an equilibrium state between the freshwater and saltwater, making them complex and fragile in nature and also Cited by: 8. primarily as a result of periodic vertical flow due to tidal fluctuations. Mixing depends to a lesser extent on transverse Hydrogeology of Coastal Aquifers and Oceanic Islands 5 Physics of Seawater Transition Zone ..•.••••.. 6 7 Generalized Hydrograph of Ocean Tide and Tidal Response in the Holocene Aquifer of a Dual. The purpose of the 20th Salt Water Intrusion Meeting is to provide a forum for scientists, engineers, water resource managers, and planners to share their research, ideas, and recommendations. This conference provides a unique opportunity to meet well-known and respected scientists and engineers in the field of salt water intrusion.


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response to tidal fluctuations of two non-homogeneous coastal aquifer models by John Arthur Williams Download PDF EPUB FB2

WRRCTR No The Response to Tidal Fluctuations of Two Non-Homogenous Coastal Aquifer Models: Authors: Williams, John A. Liu, Ta-Chiang: LC Subject Headings: Aquifers -- Electromechanical analogies.

Aquifers -- Mathematical models. Groundwater flow -- Mathematical models. Groundwater flow -- Electromechanical analogies. Tides -- Author: John A.

Williams, Ta-Chiang Liu. Both models were subjected to a sinusoidal tidal input. Results, in the form of graphs of amplitude and phase angle vs. position, show excellent agreement between the outputs of the mathematical and electric analog : John A.

Williams and Ta-Chiang Liu. This paper considered the tide-induced head fluctuations in two coastal multi-layered aquifer systems. Model I comprises two semi-permeable layers and a confined aquifer between them. This paper investigates tide-induced groundwater fluctuation and submarine groundwater discharge (SGD) in a leaky inhomogeneous coastal aquifer system with an upper unconfined aquifer, a lower confined aquifer, and an aquitard between them.

The upper left aquifer is formed due to land by: 7. In the past, the coastal leaky aquifer system, including two aquifers and an aquitard between them, was commonly assumed to be homogeneous and of infinite extent in the horizontal. A coastal aquifer may consist of two zones of distinctly different hydraulic properties, with the coastal zone of limited width and the inland zone of infinite width.

The analytical solutions for groundwater level response to tidal fluctuation in such a two-zone aquifer are derived and the underlying physical meanings are by:   Abstract. Hydraulic characterization of aquifer systems is of great importance for coastal aquifer management.

The efficiencies of two tide-aquifer interaction models namely, ‘vertical beach without leakage’ and ‘vertical beach with leakage’ were evaluated in this study for characterizing unconfined and confined coastal aquifers using genetic by: 1. Near the coastal areas, the variation of groundwater table is not only affected by the tidal waves, but also affected by the rainfall.

To manage the groundwater in the coastal aquifers, it is, of course, significant to consider these two factors by: 8. The solution to the transient groundwater flow model in a coastal confined aquifer with a sinusoidal fluctuation of the tide shows that the amplitude of groundwater levels is smaller than the tide.

Conceptual model of 2-D groundwater flow in a coastal aquifer bounded by U-shaped coastlines with four zones classified based on interaction behavior of the oceanic and estuarine tidal waves. X – Y is the dimensionless coordinate of x – y normalized with respect to L, which represents the length of ocean shore between the two opposite Cited by: Groundwater response to tidal fluctuation in a two-zone aquifer.

A coastal aquifer may consist of two zones of distinctly different hydraulic properties, with the coastal zone of limited width and the inland zone of infinite width. centrated on the development of mathematical and electric analog models for two non-homogeneous, one-dimensional coastal aquifers, since it is the non-homogeneous condition which is most likely to be encountered in practice.

The two types considered here are a semi-infinite aquifer. The tidal dilatation can be computed from equilibrium tide theory provided that Poisson's ratio is known.

The amplitude of the tidal dilatation produced by the large semidiurnal wave, M 2, is approximately 1 × 10 −8. It is not unusual to have earth‐tide fluctuations in wells corresponding to M 2 with an amplitude of 1 to 2 cm.

The fact. Two-dimensional model of groundwater fluctuation in anisotropic coastal aquifer is built in this paper. Based on Green’s function method and simple coordinate transformation, an analytical solution for groundwater fluctuations in fan-shaped anisotropic aquifer is derived in polar coordinates system which describes how groundwater’s response Cited by: 1.

In this respect, it is important to understand the coastal groundwater dyna- mics under the tidal fluctuation and the seawater intru- sion conditions.

The groundwater dynamics and the seawater in- trusion in coastal aquifers started to attract attentions 98 in the late 19th by: For periodic fluctuations of groundwater in a coastal aquifer in response to tidal oscillations a corollary is that the equilibrium water level far from the sea is equal to the root mean square of.

The influence of hydraulic conductivity heterogeneity on tide-induced head fluctuations is presented for a theoretical coastal confined aquifer.

The conceptual model assumes that the hydraulic conductivity increases linearly with the distance from the by: The Response to Tidal Fluctuations of Two Non-Homogeneous Coastal Aquifer Models.

Williams, John A. 15 pages: TR Bibliography of Water Resources of the Hawaiian Islands. Pfund, Rose T. pages: TR Thermal Properties of Sea Water. Chou, James: 50 pages: TR   Effects of tidal fluctuations on mixing and spreading in coastal aquifers: Homogeneous case. María Pool.

Corresponding Author. Faculty of Science and Engineering, National Centre for Groundwater Research and Training, Flinders University, Adelaide, Australia Large storativity implies a nonuniform hydraulic response to the tidal forcing Cited by: Yeh et al.

considered anisotropic tidal unconfined aquifer and developed a new analytical model for describing the water table fluctuations. [4] When the groundwater table of an unconfined coastal aquifer fluctuates in response to the tides, the total weight of the pore water in the unconfined aquifer will vary accordingly.

This will in turn Cited by: 8. Introduction. Analytical studies of tidal effects play an important role in coastal hydrogeology.

For example, Jacob,Nielsen,Li and Chen,and Sun () derived various solutions to describe the tidal groundwater fluctuations in a single coastal confined aquifer under the assumption that the coastline is straight. Jiao and Tang,Li and Jiao, a, Li Cited by: estimates of the tidal characteristics and aquifer parameters that can minimize the objective function value.

Field data simulator Figure 1 illustrates the groundwater fluctuations in response to tidal variations in a coastal aquifer.

Jeng et al. () assumed that the flow in a rigid porous medium is homo-geneous and incompressible. The model was first run to steady state with no tidal fluctuations. Tidal fluctuations were then simulated for 60 days—this simulation time was sufficient for the aquifer system to reach the quasi‐steady state with respect to the water table fluctuations.

Grid discretization tests were performed to ensure that the model solution was by: 1. The problem of current urban groundwater pollution is very serious, which has influenced social development and people’s daily life.

Around the land-sea interface, tide obviously changes nearshore the groundwater flow regime and makes the pollutant migration process become more complex. In the present study, the effect of tide-induced groundwater table fluctuations Cited by: 2.

The model in this study consists of a semiconfined coastal aquifer overlying a sloping impermeable base in the presence of tidal waves. The groundwater flow was represented by a nonlinear Boussinesq equation, which was further solved analytically by converting it into a linearized form using a suitable technique.

Using the tidal response model, the aquifer hydraulic conductivity(K) at these two sites is estimated to be × 10 -3 and × 10 -3 m s -1, respectively. It was also indicated by the inverse modeling that the tidal fluctuations affect the study area up to. While seawater intrusions are widely discussed, the salinization of coastal aquifers via narrow rivers is hardly documented.

This study investigates groundwater dynamics in an aquifer next to an estuarine stream on the eastern Mediterranean coast. Groundwater levels and salinization patterns were examined as a response to dynamic changes in estuary water, both in low-and Cited by: 2.

[1] A confined coastal aquifer usually extends under the sea for some distance with its submarine outlet covered by a thin layer of sediment with properties dissimilar from the aquifer.

Previous theoretical studies neglected this outlet capping. In this paper an analytical solution is derived for a confined aquifer subject to tidal fluctuations with a leaky boundary condition at Cited by: Transient groundwater dynamics in a coastal aquifer: The effects of tides, the lunar cycle, and the beach profile Elena Abarca,1 Hanan Karam,1 Harold F.

Hemond,1 and Charles F. Harvey1 Received 10 July ; revised 16 December ; accepted 20. response of coastal aquifers to tidal fluctuations. It deals specifically with the response of an aquifer system consisting of two horizontal and semi-infinite,aquifers separated by a semipermeable layer, or aquitard.

Coastal boundaries represent a unique hydrogeologic environment due to the effects of tidal fluctuations and mixing between freshwater and saltwater aquifers.

Field investigations of groundwater quantity and quality within this environment may require data collection from multiple depths and positions relative to the coastal boundary. In theFile Size: 13KB. and structure of a coastal aquifer system including the connectivity between the aquifer and ocean.

This study presents an improved approach for characterizing a permeable heterogeneous coastal aquifer system through analysis of the propagation of the tidal signal, as well as offshore storm pulse signals through a coastal by: 1.

half and is overlain by the upper two aquifers the Pungo River and Yorktown aquifers. Typically, the head decreases downward into the Castle Hayne aquifer from overlying beds (wellpi.

7; w pi. 8), indicating recharge. Natural discharge from the Castle. Hayne aquifer occurs in stream channels where the streams have cutCited by: Effect of tidal fluctuations on transient dispersion of simulated contaminant concentrations in coastal aquifers. Variable-density groundwater models require extensive computational resources, particularly for simulations representing short-term hydrologic variability such as tidal fluctuations.

Saltwater-intrusion models usually neglect tidal. A two-dimensional digital-computer flow model was developed to simulate the Farrington aquifer in the northern part of the Coastal Plain of New Jersey.

The area of detailed study includes approximately square miles in Middlesex and Monmouth Couties where the aquifer provides a large part of the municipal and industrial water supply. The area modeled is much larger. tidal and storm pulse propagation may be a valuable and affordable approach to investigate complex coastal aquifers.

Comparison of field data with existing analytical solutions, however, suggests more work is required to describe the effects of tides and offshore storms on groundwater table fluctuations in complex aquifer : Victoria A Trglavcnik. logic analytical models are applied based on ocean tidal forcing to aquifer well response.

None of the three models produced results con-sistent with the sparse APT data. It is inferred that three models do not provide an adequate representation of the geophysical interface between the Floridan Aquifer and Atlantic Ocean. It is shown that. The Importance of Determining Aquifer Properties in Coastal Areas 24 Physical Modelling of Coastal Aquifers to Improve Methods for Accurately Determining Aquifer Properties 24 Chapter 2 The Durham Model Aquifer 27 Introduction 27 Model Concepts 27 Model Size 28 Model Overview 29 Soil Material Details 32 Understanding of coastal hydrogeology is essential for the assessment, management, and protection of coastal groundwater resources.

Coastal groundwater is often an important source of drinking water for coastal communities but can be contaminated by saltwater or human-derived contaminants. The groundwater table in coastal aquifers fluctuates in response to various Author: Victoria A Trglavcnik.

Tidal-signal attenuations are analyzed to compute hydraulic diffusivities and estimate regional hydraulic conductivities of the Northern Guam Lens Aquifer, Territory of Guam (Pacific Ocean), USA.

The results indicate a significant tidal-damping effect at the coastal boundary. Hydraulic diffusivities computed using a simple analytical solution for well responses to tidal forcings.

considered two tidal constituents, their model focused on the effects of the beach slope on tidal flow in the unconfined aquifer modelled by a linearized Boussinesq equation.

Moreover, in many coastal areas, what abuts the sea is usually a multi-layered system (e.g. Serfes, ; Sheahan, ; Chen and Jiao, ; Jiao and Tang, ). It is.Drawdown in well O2 was approximated with two Theis models in the analytical water-level model, because a single Theis model could not replicate the “known” pumping signal.

Well O2 is screened in an aquifer that is separated by a confining unit from the aquifers that are penetrated by the pumping well (Figure 3).Cited by: 4.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.