تعیین آسیب‌پذیری آبخوان روضه چای دشت ارومیه با استفاده از روش ترکیبی شاخص‌های DRASTIC، SINTACS و SI

موسی زاده, رامین; عباس نوین پور, اسفندیار; صادقی اقدم, فریبا

doi:10.22092/wmej.2020.127818.1261

تعیین آسیب‌پذیری آبخوان روضه چای دشت ارومیه با استفاده از روش ترکیبی شاخص‌های DRASTIC، SINTACS و SI

نوع مقاله : پژوهشی

نویسندگان

¹ دانش‌آموخته کارشناسی ارشد هیدروژئولوژی گروه زمین‌شناسی، دانشکده علوم، دانشگاه ارومیه، ارومیه، ایران

² استادیار، گروه زمین‌شناسی، دانشکده‌ی علوم، دانشگاه ارومیه، ارومیه، ایران

³ دانشجوی دکتری هیدروژئولوژی، گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز، ایران

10.22092/wmej.2020.127818.1261

چکیده

دشت روضه‌چای در حاشیهی غربی دریاچهی ارومیه بهدلیل کمی عمق سطح ایست‌آبی، رونق کشاورزی، به‌کاربردن کودهای شیمیایی و آفت‌کشها با احتمال آلودگی آبخوان مواجه است. ارزیابی آسیب‌پذیری می‌تواند نقشی حیاتی در حفاظت و بهره‌برداری از آبخوان بازی کند. داده‌ها و اطلاعات متعدد ازجمله نقشههای ارتفاع رقومی و کاربری زمین، آمار چاههای بهرهبرداری و اکتشافی، و غلظت نیترات نمونه‌های تجزیه‌شده در خرداد 1395 به‌کار برده شد. توزیع فراسنج‌های عمق سطح ایست‌آبی، تغذیهی خالص، هدایت آبی، پستی‌وبلندی، کاربری زمین، محیط نااشباع، آبخوان و خاک با کاربرد درونیابی کریجینگ با نرمافزار آرک‌جی‌آی‌اس انجام شد. لایههای رستری با اعمال رتبهبندی و وزندهی با توابع هم‌پوشان تلفیق و توزیع آسیبپذیری روشهای دراستیک، سینتکس و اس‌آی تعیین شد. با کاربرد روش ترکیبی وزندار، نقشهی نهایی منطقه‌های آسیب‌پذیر تهیه شد. برای ارزیابی عمل‌کرد هر یک از سه روش، ضریب همبستگی بین اندازه‌ی نیترات و شاخصهای آسیبپذیری به‌ترتیب با اندازه‌ی 0/43، 0/37 و 0/30 و شاخص همبستگی 28، 27 و 25 محاسبه شد. نتیجه‌ها نشان داد که اندازه‌ی ضریب همبستگی روش ترکیبی (60/0) و شاخص همبستگی (35) بیش‌تر از روشهای منفرد آسیبپذیری بود. شاخص ترکیبی داده‌شده در این مقاله می‌تواند هم‌زمان آسیب‌پذیری ذاتی و اندازه‌ی خطر واقعی و به‌هنگام آسیب‌پذیری را باهم یکی کند و آسیب‌پذیری جامع را نشان دهد. براساس نتیجه‌ی کاربرد این روش حدود 30% از مساحت دشت روضه‌چای در محدوده‌های با خطر آسیب‌پذیری کم، 45% با آسیب‌پذیری متوسط و 25% با آسیب‌پذیری زیاد است.

کلیدواژه‌ها

عنوان مقاله [English]

Determining Vulnerability of the Rozeh Chay Aquifer in the Urmia Plain, Using the Combination Method of DRASTIC, SINSTAC and SI Indexes

نویسندگان [English]

Ramin Mosazade ¹
Esfendiar Abbas Novinpour ²
Fariba Sadeghi Aghdam ³

¹ M.Sc. Graduated Student in Hydrogeology, Department of Geology, Faculty of Science, Urmia University, Urmia, Iran

² Assistant Professor, Department of Geology, Faculty of Science, Urmia University, Urmia, Iran

³ Ph.D student in Hydrogeology, Department of Earth Sciences, Faculty of Natural Sciences, University of Tabriz, Iran

چکیده [English]

The Rozeh Chay Plain is located on the western margin of the Urmia Lake. The shallow groundwater table, agricultural activities, and particularly the use of fertilizers and pesticides may lead to the groundwater contamination. Therefore, assessing the vulnerability can play a vital role in protecting and benefiting from this aquifer. Various data, including: DEM, land use, operation and observation wells and nitrate concentration of water samples analyses in May 2016 were used. Using the ArcGIS, the raster layers of groundwater depth, net recharge, hydraulic conductivity, topography, land use, unsaturated zones, aquifer and soil media were determined using the kriging interpolation method. These layers were integrated by ranking and weighting with the overlapping functions and the layers of DRASTIC, SINTACS and SI methods were determined. The final map of the vulnerable areas was prepared using a weighted combination method. In order to evaluate the performance of each DRASTIC, SINTACS and SI method, the correlation coefficients (r) were calculated between the nitrate values and vulnerability indices were: 0.43, 0.37 and 0.30, respectively, and the correlation indices (CI) were 28, 27 and 25 respectively. The results showed that combination methods had higher values of the r (0.60) and CI (35) than the individual methods. The combined index presented in this study can combine both the intrinsic vulnerability and the actual and timely vulnerability risk, and in fact shows the comprehensive vulnerability. Based on the combined method, about 30, 45, and 25 percent of the area of the Rozeh Chay Plain are located in the low, medium and high vulnerability range, respectively.

کلیدواژه‌ها [English]

DRASTIC
combined method
Rozeh chay plain
SI
SINSTAC
vulnerability indexes

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