نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی کارشناسی ارشدسابق آب و سازه‌های هیدرولیکی، دانشگاه صنعتی سیرجان، ایران
2 گروه عمران دانشگاه صنعتی سیرجان
چکیده
منابع آبزیرزمینی به عنوان دومین منبع آب شیرین موجود در جهان بعد از یخچال ها به شمار می آیند. کمبود آب و عدم اتخاذ مدیریت صحیح منابع آب، باعث ایجاد خشکسالی و در نتیجه بحران های آبی شدید در نقاط مختلف جهان و کشور ایران شده است. اضافه برداشت از مخازن آبزیرزمینی آبخوان میناب موجب شده که میزان تغذیه ورودی به آبخوان جوابگوی میزان برداشت نباشد و درنتیجه سطح آب زیرزمینی آبخوان افت کند. یکی از اهداف مطالعات هیدروژئولوژی، پیش بینی رفتار جریان آبزیرزمینی به منظور مدیریت بهینه منابع آبزیرزمینی میباشد. لذا در پژوهش حاضر، مدلسازی کمی و کیفی آبخوان میناب با استفاده از نرمافزار GMS 7.1 انجام شد. مدلسازی کمی جریان آبزیرزمینی در حالت ماندگار برای مهر 1381 و در حالت غیرماندگار برای سال آبی 1382-1381در قالب کد MODFLOW اجرا شد. با انجام فرایند واسنجی، مقدار RMSE برای محاسبه سطح آبزیرزمینی در مدل ماندگار و غیرماندگار، به ترتیب268/0 و 25/0 متر برآورد گردید. با توجه به نتایج بدست آمده، میزان افت متوسط سالانه سطح آبزیرزمینی آبخوان پس از یک سال برداشت، حدود 02/0 متر بدست آمد. مدل کیفی جریان آبزیرزمینی به منظور برآورد تغییرات TDS با استفاده از کد MT3DMS برای دوره یک ساله و براساس نتایج بدست آمده از مدل کمی اجرا گردید. پس از اجرا و واسنجی مدل کیفی، مقدارRMSE و MAE در برآورد TDS، به ترتیب، ppm 345/4 و ppm 357/2 بدست آمد. نتایج بدست آمده نشان داد که TDS در طول دوره مدلسازی روندی افزایشی داشته است.
کلیدواژه‌ها
عنوان مقاله [English]
Investigating the Status of Underground Water in Minab Plain Using Quantitative and Qualitative Models MODFLOW and MT3DMS
نویسندگان [English]
- Zahra Mortazavi 1
- marzieh mohseni 2
1 MSc. Graduate Student, Department of Civil Engineering, Sirjan University of Technology, Sirjan,
2 sirjantec university
چکیده [English]
Groundwater resources are considered as the second largest fresh water resource of earth after glaciers. Water shortage and lack of proper management of groundwater resources result in droughts and consequent severe water crises around the world as well as Iran. Excessive withdrawal of groundwater from the Minab Aquifer caused that the inlet of the aquifer could not cope with the withdrawal and, as a result, the groundwater level was dropped. Prediction of groundwater flow behavior for optimal management of groundwater resources is one of the objectives of hydrological studies. Thus, the present study considered quantitative and qualitative modeling of the Minab aquifer by using GMS 7.1 which has a special importance in water management. Quantitative modeling of groundwater flow was carried out in MODFLOW code for steady state in October 2002 and for unsteady state during the year of 2002-2003. By calibrating the models, the RMSE and MAE values for determining groundwater levels were estimated as 0.268 and 0.25 meters, respectively. The average annual drop of groundwater level in Minab aquifer was estimated as 0.02 m during a year. The qualitative model of groundwater flow was run for a year period to determine TDS value by using MT3DMS code. After Model calibration, the RMSE and MAE values were estimated as 4.345 ppm and 2.357 ppm. It can be concluded that the current trend of groundwater flow will decrease the groundwater level and increase the aquifer pollution level.
کلیدواژه‌ها [English]
- Dispersion Coefficient
- Hydraulic conductivity
- Groundwater level
- Total Dissolved Solids (TDS)
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