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اعمال سناریوی مدیریتی در پیش بینی نوسانات سطح آب زیرزمینی با مدل مفهومی و ریاضی MODFLOW (مطالعۀ موردی: دشت خزل‌ـ نهاوند) | ||
| اکوهیدرولوژی | ||
| مقاله 2، دوره 3، شماره 3، مهر 1395، صفحه 303-319 اصل مقاله (1.23 M) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2016.60021 | ||
| نویسندگان | ||
| رسول قبادیان1؛ زینب بهرامی* 2؛ سمانه دباغ باقری2 | ||
| 1دانشیار، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه | ||
| 2کارشناس ارشد مهندسی منابع آب، گروه مهندسی آب، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی، کرمانشاه | ||
| چکیده | ||
| در بسیاری از کشورهای خشک جهان از‌جمله ایران اصلیترین منبع تأمین آب، ذخایر آب زیرزمینی است. افزایش بیرویۀ جمعیت در کشور، محدودیت منابع آبهای سطحی و بهرهبرداری بیش از اندازه از آبخوانها سبب افت شدید سطح آب زیرزمینی در بسیاری از دشتهای کشور مثل دشت خزل همدان شده است. دشت خزل از لحاظ کشت محصولات استراتژیک و تأمین آب منطقه، اهمیت دارد و به مطالعات کمّی و کیفی جدی منابع آب زیرزمینی نیازمند است. بنابراین، در تحقیق حاضر ابتدا، مدل کمی آبخوان دشت یادشده با کد MODFLOW در بستۀ نرمافزار GMS تهیه و در دو حالت جریان ماندگار (مهرماه 1385) و غیرماندگار (از آبانماه 1385 تا مهرماه 1386) واسنجی و در مهرماه 1387 صحتسنجی شد. طی واسنجی مدل به‌روش سعی و خطا، مقادیر ضرایب نفوذپذیری و توانایی عبور جریان بستر رودخانهها و مرزها در حالت ماندگار و آبدهی و ذخیرۀ ویژه در حالت غیرماندگار کالیبره شد. سپس نوسانات سطح آب برای 1، 3 و 10 سال آینده با شرایط کنونی و با اعمال سناریوی مدیریتی کاهش 10 درصدی پمپاژ چاهها، پیشبینی شد. نتایج نشان داد بیشترین افت سطح آب زیرزمینی در نواحی شمال شرق دشت رخ میدهد که مقدار آن به‌ترتیب 82/1، 6/3 و 2/8 متر برای ۱، ۳ و ۱۰ سال آینده به‌دست آمد درحالی که با اعمال سناریوی یادشده این مقادیر برابر 52/0، 7/2 و 07/7 متر خواهند بود. | ||
| کلیدواژه‌ها | ||
| آب زیرزمینی؛ دشت خزل؛ واسنجی؛ MODFLOW | ||
| عنوان مقاله [English] | ||
| Applying the management scenarios in prediction of groundwater level fluctuations by using the conceptual and mathematical MODFLOW model (Case study: Khezel-Nahavand Plain) | ||
| نویسندگان [English] | ||
| Rasool Ghobadian1؛ Zeynab Bahrami2؛ Samaneh Dabagh Bagheri2 | ||
| 1Department of Water Engineering, Razi University, Kermanshah | ||
| 2M.Sc of Water Resource Engineering, Razi University | ||
| چکیده [English] | ||
| Groundwater resources are the main source of water supply in many arid countries such as Iran. Because of uncontrolled increasing of the population, limitation of surface water resources and excessive extraction from aquifers, sharp drop in groundwater level in many plains such as Khezel plain located in Hamedan province was occurred. Khezel plain is important because of strategic crop farming and water supply for the region. so needs serious qualitative and quantitative studies on its groundwater resources. In this study quantitative model of the aquifer was prepared with MODFLOW code. By the trial and error method the model was first calibrated in the both conditions: steady flow condition for October 2006 and unsteady flow condition from September 2006 to July 2007 then validated in October 2008. During the model calibration in steady condition, hydraulic conductivity of aquifer material and conductance coefficient of rivers bed and general head boundaries were optimized. On the other hand, specific yield and specific storage coefficients of the aquifer material were elevated through the model calibration in unsteady condition. After the model validation and confidence to the model result the water level fluctuations was predicted for one, three and 10 year later in two approaches: current conditions and applying the management scenario by 10% reduction in discharge of pumping wells. The results showed that, the most amount of ground water level drop occurs in the northeast area of the plain. The amounts of this water level drop were calculated 1.82, 3.6 and 8.2 meters for one, three and 10 years later respectively. But with applying the management scenario, the amounts of water level drop were calculated 0.52, 2.7 and 7.07 meters for the mentioned years. | ||
| کلیدواژه‌ها [English] | ||
| Calibration, Groundwater, Khezel plain, MODFLOW | ||
| مراجع | ||
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