ارزیابی راهکارهای علاج‌بخشی تهاجم آب شور با استفاده از شبیه‌سازی عددی (مطالعۀ موردی: آبخوان دشت آستانه‌ـ کوچصفهان)

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی عمران آب، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشیار گروه مهندسی آب، دانشکدههای ابوریحان، دانشگاه تهران

3 استادیار گروه مهندسی عمران آب، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

4 استادیار پژوهشی مؤسسۀ تحقیقات آب، وزارت نیرو

10.22059/ije.2022.331995.1563

چکیده

یکی از چالش‌های جدید در بهره‌برداری از منابع آب ‌زیرزمینی، تهاجم آب شور آبخوان‌های ساحلی است. افزایش بهره‌برداری بدون برنامه‌ریزی سبب کاهش تراز آب زیرزمینی شده و این موضوع سبب شده است تا گرادیان هیدرولیکی نوار ساحلی کاهش یابد و در برخی مناطق جریان آب‌ زیرزمینی معکوس شده و سبب شور شدن آبخوان شود. این مطالعه ارزیابی راهکارهای علاج‌بخشی تهاجم آب شور در آبخوان ساحلی آستانه-کوچصفهان را با استفاده از شبیه‌سازی عددی مورد بررسی قرار داده است. بررسی وضعیت فعلی این آبخوان با استفاده از پکیج SEAWAT بیانگر تهاجم 740 متر آب شور به آبخوان طی 5 سال را نشان داد که به منظور مدیریت این موضوع، 19 راهکار مدیریتی (کاهش برداشت آب زیرزمینی)، سازه‌ای (تغذیۀ مصنوعی و سد زیرزمینی) و تلفیقی (مدیریتی و سازه­ای) برای کاهش نفوذ آب شور ارائه شد. نتایج شبیه‌سازی راهکارهای مختلف علاج‌بخشی با استفاده از شاخص پایداری کیفی آبخوان که مبتنی بر میزان پس‌روی آب شور است، مورد ارزیابی قرار گرفت که نتایج نشان داد ‌این شاخص برای راهکارهای تعریف‌شده بین 14 ‌تا 65 درصد محاسبه شد. بیشترین بهبود نسبی آبخوان مربوط به راهکار S18 با کاهش 20 درصد برداشت آب، تغذیۀ ‌مصنوعی و سد زیرزمینی و کمترین بهبود نسبی آبخوان مربوط به راهکار S1 با کاهش 5 درصد بهره‌برداری است. نتایج نشان داد راهکار S1 با پس‌روی 100 متر آب و راهکار S18 با پس‌روی 480 متر آب شور همراه بوده است. نتایج به‌دست‌آمده از این مطالعه می‌تواند برای مدیریت بهره‌برداری در این آبخوان مورد استفاده قرار گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of saline water intrusion treatment strategies using numerical simulation (Case study: Astaneh Kuchesfahan plain aquifer)

نویسندگان [English]

  • Javid beheshti 1
  • Saman Javadi 2
  • Seyed abbas Hosseini 3
  • Hamid kardan moghaddam 4
1 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
3 Islamic Azad University, Science and Research Branch
4 Department of Water resources research, Water research institute, Ministry of energy, Tehran, Iran
چکیده [English]

One of the new challenges in exploiting groundwater resources is seawater intrusion. Unplanned increase in exploitation reduced the groundwater level, which reduced the hydraulic gradient of the shoreline and in some areas reverses the groundwater flow and leads to groundwater salinization. This study examine the seawater intrusion strategies in the Astana-Kuchesfahan coastal aquifer using numerical simulation. Examination of the current status of this aquifer using SEAWAT package was indicated the intrusion of 740 meters of seawater to the aquifer over a 5 years period showed that in order to manage this pressing matter, 19 management strategies (reduction of groundwater exploitation), structural and subsurface dam) and integrated (managerial and structural) to reduce the seawater intrusion was presented. The simulation results of different treatment strategies were evaluated using the aquifer qualitative stability index, which is based on the amount of saline water regression. The results showed that this index was calculated between 14% and 65% for the defined solutions. The highest relative aquifer improvement is related to S18 solution with 20% reduction in groundwater exploitation, artificial recharge and subsurface dam and the lowest relative aquifer improvement is related to S1 solution with 5% reduction in operation. The results showed that S1 solution was associated with 100 m water retreat and S18 solution was associated with 480 m saline water retreat. The results can be used for groundwater exploitation management in this coastal aquifer.

کلیدواژه‌ها [English]

  • SEAWAT package
  • management strategy
  • saline water intrusion
  • harvest reduction
  • simulation
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