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بررسی عددی هجوم و برگشت آب دریا در آبخوان‌های ساحلی | ||
| اکوهیدرولوژی | ||
| مقاله 4، دوره 5، شماره 4، دی 1397، صفحه 1091-1102 اصل مقاله (705.05 K) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2018.253648.841 | ||
| نویسندگان | ||
| عباسعلی رضاپور1؛ سید فضل الله ساغروانی* 2 | ||
| 1دانشجوی دکتری، دانشکدۀ مهندسی عمران، دانشگاه صنعتی شاهرود | ||
| 2دانشیار، دانشکدۀ مهندسی عمران، دانشگاه صنعتی شاهرود | ||
| چکیده | ||
| هجوم آب دریا فرایندی گذراست، اما محدودیتهای انسانی در برداشت نتایج آزمایشگاهی و عددی موجب شده که به رفتار گذرای این پدیده کمتر توجه شود. در مطالعۀ حاضر، حرکت گوۀ آب شور و ناحیۀ اختلاط در آبخوانی محصور، بر اثر کاهش و افزایش ارتفاع آب شیرین از مرز زمین توسط مدل عددی SUTRA شبیهسازی شد. بهمنظور برداشت و آنالیز نتایج شبیهسازیشده طی زمان، الگوریتم خودکاری در محیط MATLAB پیادهسازی شد. برای بررسی بیشتر حرکت گوۀ آب شور، تغییرات سه شاخص طول پنجه، مساحت و ارتفاع گوه نسبت به زمان اندازهگیری شدند. نتایج نشان داد رفتار شاخص مساحت گوه با رفتار شاخص طول پنجۀ گوه در شرایط گذرا مشابه است. در وضعیت هجوم آب دریا، شاخص ارتفاع گوه بهمراتب زودتر از دو شاخص دیگر به شرایط دائمی میرسد، در صورتی که در وضعیت برگشت، هر سه شاخص تقریباً به طور هم‌زمان پایدار میشوند. همچنین، نتایج نشان داد در اوایل مرحلۀ برگشت آب دریا، ناحیۀ اختلاط گسترش مییابد، ولی در ادامه دوباره منقبض می‌شود تا اینکه سرانجام به مقدار اولیۀ خود در ابتدای وضعیت هجوم میرسد. آنالیزهای حساسیت نشان دادند سرعت هجوم یا برگشت آب دریا تأثیری بر ضخامت ناحیۀ اختلاط در شرایط دائمی ندارد. | ||
| کلیدواژه‌ها | ||
| آبخوان ساحلی؛ برگشت آب دریا؛ شرایط گذرا؛ مدلسازی عددی؛ هجوم آب دریا | ||
| عنوان مقاله [English] | ||
| Numerical Investigation of Seawater Intrusion and Retreat in Coastal Aquifers | ||
| نویسندگان [English] | ||
| Abbasali Rezapoor1؛ Seyed Fazlolah Saghravani2 | ||
| 1Ph.D. Student, Department of Civil engineering, Shahrood University of Technology | ||
| 2Associate Professor, Department of Civil engineering, Shahrood University of Technology | ||
| چکیده [English] | ||
| Seawater intrusion is a transient process, but the transient behavior of this phenomenon has received less attention due to human limitations to acquire numerical and experimental results. The influence of decreasing and increasing of the freshwater head on the saltwater wedge and the mixing zone movement was simulated using SUTRA code. To acquire and analysis simulated resulting, automated algorithm was planned in MATLAB. In order to more study the saltwater movement, changes in the three indicators of wedge toe length, wedge area and wedge height were measured over the time. The results demonstrated that the wedge area behavior is similar to the wedge toe length under transient condition. In the case of seawater intrusion, the wedge height reaches the steady state conditions sooner than the two other indicators, while in the retreating case, all the three indicators are stopped almost together. Also, the results showed that the mixing zone expanded at the primary stages of the retreating, but whit passage of time condensed again until it finally reaches its original state at the beginning of the intruding case. Sensitivity analyzes demonstrated that the rate of seawater intrusion and retreat does not affect the mixing zone thickness in the steady condition. | ||
| کلیدواژه‌ها [English] | ||
| Seawater intrusion, seawater retreat, coastal aquifers, transient condition, Numerical Modeling | ||
| مراجع | ||
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