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حل دقیق پاسخ جریان آب زیرزمینی در آبخوان بسته به تغییرات سطح آب رودخانه | ||
| اکوهیدرولوژی | ||
| مقاله 9، دوره 6، شماره 4، دی 1398، صفحه 957-968 اصل مقاله (775.98 K) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2019.282765.1132 | ||
| نویسندگان | ||
| ایرج سعیدپناه* 1؛ سمیه محمدزاده روفچائی2 | ||
| 1استادیار گروه عمران دانشکدۀ مهندسی، دانشگاه زنجان | ||
| 2دانشجوی 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 | ||
| آبخوان بسته؛ اندرکنش آبخوان و رودخانه؛ جریان غیردائمی آب زیرزمینی؛ روش تفکیک متغیرها؛ مدل ریاضی | ||
| عنوان مقاله [English] | ||
| Exact Solution of Groundwater Flow Response in a Confined Aquifer to Variation in River Level | ||
| نویسندگان [English] | ||
| Iraj Saeedpanah1؛ Somayeh Mohammadzade Roofchaee2 | ||
| 1Assistant Professor, Department of Civil Engineering ,University of Zanjan, Iran | ||
| 2M.Sc. student Hydraulic Structures, Civil Engineering ,University of Zanjan, Iran | ||
| چکیده [English] | ||
| In this paper a mathematical model is developed to investigate the effects of tidal river fluctuations on the groundwater head of confined aquifer. To simulate the interaction between groundwater flow of the confined aquifer near tidal river in a unsteady flow, we used the separation method. This model is for simulating groundwater level and it requires estimation of hydrogeological parameters of transmissivity and storage coefficient. Two elements of falling and rising water levels have been studied in this paper. To verify the analytical solution of the model, GMS software Modflow is used and the results of the survey conducted comparing the effectiveness of analytical and numerical model solved by separation of variables and methods of proposed model for the hydraulic confined aquifer and river tidal is shown. Compared with an analytical solution based on a sinusoidal assumption and a numerical solution generated by MODFLOW, this solution provided better performance in groundwater-level prediction in a confined aquifer According to the investigation done, if the coefficient of transmissibility increases, water level rises. Evaluations of analytical solutions show that the effect of changes in levels of transmission capability between 1 and 2 km from the border tidal was remarkable. And with increased transmission capability, head of the underground water level also rises away from the border reduced and it creates a wave whit with lesser amplitude and needs more time to create it. | ||
| کلیدواژه‌ها [English] | ||
| Unsteady groundwater flow, Confined aquifer, Mathematical model, Method of separation of variables, River -aquifer interaction | ||
| مراجع | ||
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