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103086

Tidal Effect on Groundwater Fluctuations and Saltwater Intrusion in Coastal Heterogeneous Aquifers.

Article

Last updated: 22 Jan 2023

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Subjects

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Tags

Irrigation and Hydraulic Engineering

Abstract

Groundwater table and saltwater wedge in coastal areas are commonly affected by tidal waves fluctuations. In this research, for the first time, a two-dimensional numerical model in plan is developed for simulating both the tidal fluctuation of the beach groundwater table and movement of interface between saltwater and freshwater in both coastal confined and unconfined heterogeneous aquifers. The sharp interface philosophy is adopted to simulate dynamics of freshwater flow. Tidal waves are simulated by simple harmonic motions in time. The solution is based on an approach of separating large and small time scales motions of groundwater fluctuations. The proposed model consists of two sub-models. The first one applied Finite Element Method (FEM) to simulate the hydraulic responses of the aquifer in large time scale and it is coupled with Finite Difference Method (FDM), in the second sub-model, to simulate the corresponding ones in small time scale. The model is verified against analytical solutions presented by other previous researchers in case of homogenous aquifer. To simulate the aquifer heterogeneity, unconditional random log-hydraulic conductivity fields are generated to present different hydraulic conductivity realizations for the aquifer under consideration. The application is carried out on both the hypothetical confined aquifer and the real Quaternary unconfined aquifer in El Arish-Rafah area, Egypt. Results show that both the groundwater fluctuation and saltwater intrusion due to tidal waves are affected by the aquifers heterogeneity and the tidal waves effects in confined aquifers are more significant than in unconfined aquifers.

DOI

10.21608/bfemu.2020.103086

Keywords

Saltwater intrusion, Finite element method, Diurnal tide, Sharp interface, Heterogeneous aquifers, Seawater fluctuations, Quaternary aquifer

Authors

First Name

Kassem

Last Name

El-Alfy

MiddleName

Salah Abd El Wahab

Affiliation

Professor of Hydraulics., Mansoura University, Dean of Mansoura High Institute of Eng. And Technology

Email

amrorana2003@yahoo.com

City

Mansoura

Orcid

-

First Name

Hamdy

Last Name

El-Ghandour

MiddleName

A.

Affiliation

Assistant prof., Irrigation & Hydraulics Dept., Faculty of Engineering, Mansoura University, Egypt.

Email

hamdy_elghandour@yahoo.com

City

-

Orcid

-

First Name

Mahmoud

Last Name

Abd-Elmaboud

MiddleName

E.

Affiliation

M.Sc. Student, Irrigation & Hydraulics Dept., Faculty of Engineering, Mansoura University, Egypt

Email

-

City

-

Orcid

-

Volume

39

Article Issue

1

Related Issue

15575

Issue Date

2014-03-01

Receive Date

2014-02-15

Publish Date

2020-07-15

Page Start

1

Page End

22

Print ISSN

1110-0923

Online ISSN

2735-4202

Article File

BFEMU_Volume 39_Issue 1_Pages 1-22.pdf

PDF . 3.3MB

Link

https://bfemu.journals.ekb.eg/article_103086.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=103086

Order

1

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

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Details

Type

Article

Created At

22 Jan 2023