نشریه علمی هیدرولیک

نشریه علمی هیدرولیک

بررسی آزمایشگاهی و عددی پیشروی آب شور در آبخوان ساحلی شنی شیبدار در شرایط گذرا

نوع مقاله : مقاله کامل (پژوهشی)

نویسندگان
1 گروه مهندس عمران، دانشگاه بیرجند
2 گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند
3 گروه مهندس عمران، دانشگاه صنعتی بیرجند
چکیده
شناخت مسئله نفوذ آب شور در آبخوان های ساحلی، نقش موثری بر مدیریت منابع آب زیرزمینی مناطق ساحلی دارد. مطالعات پیشین ضمن نادیده گرفتن سطح شیبدار ساحل که یک پدیده بسیار رایج در طبیعت است، مسئله پیشروی آب شور را بررسی کرده اند. در این تحقیق دینامیک گذرای پیشروی گوه آب شور دریا در سواحل شنی شیبدار توسط مدل آزمایشگاهی و عددی بررسی شد. مشاهدات آزمایشگاهی با استفاده از تکنیک پردازش تصویر تحلیل شدند. از کد عددی SEAWAT برای شبیه سازی نتایج آزمایشگاهی استفاده گردید. برای بررسی رفتار گوه آب شور در شرایط گذرا، تغییرات شاخص های طول پنجه، ارتفاع و مساحت گوه نسبت به زمان اندازه گیری شد. نتایج نشان دادند که الف) نرخ نسبی تغییرات مساحت گوه در بیشتر زمانها با نرخ نسبی تغییرات پنجه گوه برابر است. لذا شاخص طول پنجه گوه نماینده مناسبی برای بیان میزان حجم آب شور هجوم آورنده به آبخوان ساحلی است. ب) در هنگام هجوم آب شور، شاخص ارتفاع گوه خیلی زودتر از شاخص های پنجه گوه و مساحت گوه به شرایط دائمی می رسد، اما در مرحله بازگشت هر سه شاخص تقریباً با هم متوقف می شوند. ج) شاخص ارتفاع گوه در هر دو مرحله پیشروی و بازگشت در مدت زمان تقریباً برابری به شرایط دائمی می رسد. اما شاخص طول پنجه گوه در مرحله بازگشت نسبت به مرحله پیشروی خیلی زودتر به شرایط دائمی می رسد. د) در شرایط گذرا با نوسان سطح آب شیرین آبخوان، میزان پیشروی گوه آب شور در شیبهای تندتر بیشتر از شیب های کمتر است.
کلیدواژه‌ها

موضوعات


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