نوع مقاله : مقالات پژوهشى اصیل کمی و کیفی
نویسندگان
گروه محیط زیست، دانشگاه آزاد اسلامی، واحد اصفهان (خوراسگان)، اصفهان، ایران
چکیده
چکیده
زمینه و هدف: ارزیابی آسیب‌پذیری آب زیرزمینی، بخش مهمی از مدیریت منابع آبی است. مطالعه حاضر با هدف ارزیابی آسیب‌پذیری آبخوان دشت لردگان با استفاده از مدل‌های دراستیک، گادز، ای وی آی و نرم‌افزار سیستم اطلاعات جغرافیایی ورژن 10/5 انجام گرفت.
مواد و روش‌ها: مدل دراستیک اصلاح شده، مدلی است که خصوصیات هیدروژئولوژیکی مؤثر بر آلودگی آب‌های زیرزمینی را با استفاده از 8 لایه بررسی کرد و با امتیازدهی و ترکیب این پارامترها در محیط جی ای اس، مناطق آسیب پذیر آبخوان را مشخص کرد. در مدل ای وی آی فقط بر اساس دو پارامتر، ضخامت هر یک از واحدهای رسوبی و ضریب هدایتی هیدرولیکی، آسیب‌پذیری تعیین شد. در شاخص گادز از نوع آبخوان، منطقه غیراشباع، عمق سطح ایستابی و نوع خاک به منظور ارزیابی آسیب‌پذیری آبخوان استفاده شد. ابتدا اطلاعات مرتبط با سه مدل جمع آوری گردید و لایه های مربوطه پس از ورود به نرم افزار جی ای اس تهیه شد و با استفاده از روش های همپوشانی و اعمال ضرایب وزنی موردنظر بر روی هر لایه، نقشه های نهایی آسیب پذیری منطقه به سه روش تهیه شد. جهت اعتبارسنجی نتایج و تعیین اولویت پارامترها از آنالیز حساسیت استفاده شد.
یافته‌ها: بر اساس نتایج تحقیق، به‌ترتیب 14%، 76% و 10% از مساحت منطقه دارای پتانسیل آسیب‌پذیری متوسط، زیاد و خیلی زیاد بودند. بر اساس نتایج مدل ای وی آی، بیش از 95% آبخوان در طبقه با حساسیت بالا قرار داشت. بر اساس مدل گادز، 45/3% از منطقه در کلاس آسیب‌پذیری کم و مابقی در کلاس متوسط قرار داشت.
نتیجه گیری: آنچه که از نتایج این مطالعه برمیآید مدل دراستیک اصلاح شده از صحت قابل قبولتری برخوردار است. مدل‌های ارزیابی آسیب‌پذیری آب‌های زیرزمینی، ابزارهای بسیار ارزشمندی برای مسئولان فراهم کرده تا بتوانند تصمیمات لازم را در جهت مدیریت آبخوان دشت لردگان اتخاذ کنند.
نوع مقاله: مقاله پژوهشی
کلیدواژه‌ها
عنوان مقاله [English]
Determination of aquifer vulnerability in Lordegan aquifer using DRASTIC, AVI and GODS Models
نویسندگان [English]
- Majid Ghanbarian
- Mozhgan Ahmadi Nadoushan
Department of Environmental science, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
چکیده [English]
Background and purpose: In this study, the vulnerability of Lordegan Plain Aquifer to pollution has been evaluated using DRASTIC, GODS, AVI and ArcGIS 10.5 software.
Materials and methods: The Modified DRASTIC model containing eight parameters, is a model to study the hydrogeological properties affecting groundwater pollution. By weighting and combining these parameters in the ArcGIS 10.5, vulnerable areas of the aquifer to pollution were identified. AVI method measured groundwater vulnerability using two physical parameters containing the thickness of each sedimentary rock above the uppermost saturated aquifer surface and estimated hydraulic conductivity. GODS model assessed aquifer vulnerability based on four layers of aquifer type, unsaturated area, surface depth and soil type. Sensitivity analysis was used to to show the effectiveness of the parameters used to evaluate the vulnerability index.
Results: The results of this study showed that based on modified DRASTIC model, 14, 76 and 10% of the study area had a moderate, high and very high potential vulnerability to pollution, respectively. The results of AVI model showed that more than 95% of the aquifers had high sensitivity to pollution. The results of the GODS model indicated that 45.3 percent of the region was in low vulnerability class and the rest in the middle vulnerability class.
Conclusion: Results indicated that vulnerability assessment models provides valuable tools for authorities and decision makers to manage the Lordegan aquifer.
کلیدواژه‌ها [English]
- Vulnerability
- DRASTIC
- GODS
- AVI
- Lordegan aquifer
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