با همکاری انجمن هیدرولیک ایران

ارائه حل نیمه‌تحلیلی ‌مسئله هنری و بررسی تأثیر شیب بر پیشروی آب شور دریا به آبخوان‌های محصور ساحلی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی آب، دانشکده کشاورزی، دانشگاه شهرکرد، شهرکرد، ایران

2 گروه مهندسی آب و محیط زیست، دانشگاه استراسبورگ، فرانسه.

چکیده
در این پژوهش، یک راه‌حل نیمه‌تحلیلی برای مسئله هنری در آبخوان‌های ساحلی شیب‌دار ارائه شد. با به‌کارگیری تبدیل مختصات شیب‌دار و روش فوریه–گالرکین، معادلات حاکم بر جریان چگالی متغیر و انتقال جرم در حالت جریان ماندگار حل شده و ضرایب سری‌های فوریه از طریق روش نیوتن همراه با محاسبه تحلیلی ژاکوبین تعیین گردید. هدف اصلی این مطالعه، صحت‌سنجی راه حل نیمه‌تحلیلی ارائه شده در هندسه‌های غیر افقی و بررسی تأثیر شیب بستر بر پیشروی گوه آب شور به سمت آبخوان است. مقایسه دقیق بین راه‌حل نیمه‌تحلیلی و نتایج حل عددی مدل کامسول حاکی از همپوشانی بسیار بالا میان خطوط هم‌غلظت 25، 50 و 75 درصد است که صحت و پایداری روش ارائه‌شده را تأیید می‌کند. نتایج برای شیب‌های بین 30- تا 30+ درجه نشان داد که شیب رو به خشکی موجب افزایش طول نفوذ آب شور شده، درحالی‌که شیب رو به دریا سبب فشرده‌شدن گوه و کاهش پیشروی می‌گردد. یافته‌ها نشان می‌دهند که تغییرات شیب بستر رابطه‌ای تقریباً خطی با طول نفوذ گوه شور دارد و شیب هندسی بستر نقشی کلیدی در کنترل رفتار آب شور در آبخوان‌های ساحلی ایفا می‌کند. راه‌حل نیمه‌تحلیلی توسعه‌یافته در این تحقیق می‌تواند به‌عنوان یک معیار معتبر برای ارزیابی عملکرد مدل‌های عددی مورد استفاده قرار گیرد و به‌عنوان ابزاری قدرتمند برای تحلیل سریع سناریوهای مدیریتی و ارزیابی اثرات تغییر اقلیم در مناطق ساحلی شیب‌دار به کار رود.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Providing A Semi-Analytical Solution To The Henry Problem and The Effect of Bed Slope on Seawater Intrusion into Confined Coastal Aquifers

نویسندگان English

saleh mehdizadeh 1
Rasoul Mir abbasi najaf abadi 1
ali Raeisi Isa-Abadi 1
Marwan Fahs 2
1 Department of Water Engineering, Shahrekord University, Shahrekord, Iran.
2 Laboratoire d’Hydrologie de Géochimie, National School for Water and Environmental Engineering, University of Strasbourg, France.
چکیده English

In this study, a semi-analytical solution to the Henry problem in sloping coastal aquifers is developed. Using the Fourier–Galerkin method, the governing equations of variable-density flow and mass transport under steady-state conditions for a sloping geometry are solved, and the Fourier series coefficients are determined using Newton’s method along with analytical calculation of the Jacobian. The main objective of this study is to verify the validity of the proposed semi-analytical solution in non-horizontal geometries and to investigate the effect of bed slope on the advancement of the saltwater wedge into the aquifer. Comparison between the semi-analytical solution and the numerical results obtained from the COMSOL model indicates a high degree of overlap among the 25%, 50%, and 75% isochlor lines, confirming the accuracy and stability of the proposed method. Results for slopes ranging from −30° to +30° show that a landward slope increases the length of saltwater intrusion, whereas a seaward slope compresses the wedge and reduces its advance. The semi-analytical solution developed in this study can be used as a reliable benchmark for evaluating the performance of numerical models and as a powerful tool for analyzing management scenarios and assessing the impacts of climate change in inclined coastal aquifers.

کلیدواژه‌ها English

Inclined coastal aquifers
Henry Problem
Semi-Analytical solution
Saltwater intrusion
COMSOL model
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