حل دقیق پاسخ جریان آب زیرزمینی در آبخوان بسته به تغییرات سطح آب رودخانه

نوع مقاله : پژوهشی

نویسندگان

1 استادیار گروه عمران دانشکدۀ مهندسی، دانشگاه زنجان

2 دانشجوی کارشناسی ارشد مهندسی عمران، دانشگاه زنجان

چکیده

در پژوهش حاضر یک مدل ریاضی به منظور شبیه‏‌سازی اندرکنش بین جریان آب زیرزمینی و تغییرات تراز آب رودخانه و همچنین بررسی نوسانات هد هیدرولیکی در آبخوان مجاور رودخانۀ جزر و مدی با به دست آوردن یک حل دقیق ارائه شده است. این مدل ریاضی براساس مفاهیم هیدرولیک جریان آب زیرزمینی تحت تأثیر تغییرات تراز آب رودخانه و تغییرات سطح آب زیرزمینی ناشی از نوسانات مرز سمت چپ آبخوان پایه‏گذاری شده است. دو مسئلۀ پایین افتادن و بالا رفتن سطح آب رودخانه بررسی شده است. بررسی محاسبات نشان می‌دهد با دور شدن از مرز جزر و مدی، مقادیر نوسانات کاهش می‏یابد و موج‏هایی با دامنۀ نوسان کمتر ایجاد می‏شوند. تأثیر جزر و مد در مقاطع بین 1 تا 2 کیلومتری از مرز جزر و مدی چشمگیرتر است و همچنین با افزایش قابلیت انتقال، میزان هد هیدرولیکی سطح آب افزایش می‏یابد و در مقطع با فاصلۀ 700 متر از مرز جزر و مدی، تأثیرات تغییر قابلیت انتقال روی هد سطح آب چشمگیر است. برای صحت‌سنجی حل دقیق ارائه‌شده از نرم‌افزار Modflow استفاده شد. مقایسۀ نتایج به‌دست‌آمده از حل دقیق و نرم‌افزار Modflow، کارآمد بودن حل دقیق ارائه‌شده برای شبیه‏سازی اندرکنش بین هیدرولیک آبخوان بسته و رودخانۀ جزر و مدی را نشان می‏دهد.

کلیدواژه‌ها

موضوعات


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دوره 6، شماره 4
دی 1398
صفحه 957-968
  • تاریخ دریافت: 31 اردیبهشت 1398
  • تاریخ بازنگری: 31 مرداد 1398
  • تاریخ پذیرش: 31 مرداد 1398
  • تاریخ اولین انتشار: 01 دی 1398
  • تاریخ انتشار: 01 دی 1398