ارزیابی مکانی متغیرهای کیفی منابع آب زیرزمینی با هدف کاربرد آن در کشاورزی و شرب (مطالعه موردی: دشت مه‏ولات-فیض آباد)

نوع مقاله : پژوهشی

نویسندگان

1 دانش آموخته دکتری/ گروه علوم و مهندسی آب، دانشکدة کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

2 دانشجوی دکتری/ گروه علوم و مهندسی آب، دانشکدة کشاورزی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

شناخت و بهره‏برداری بهینه از منابع آب زیرزمینی اهمیت ویژه‏ای دارد. کیفیت آب شامل ویژگی‏های شیمیایی، فیزیکی و بیولوژیکی آن است. تعیین کاربری آب عمدتاً بر اساس ویژگی‌های شیمیایی آن صورت می‏گیرد. در این پژوهش، کیفیت آب زیرزمینی با اتکا بر ویژگی‌های شیمیایی آن بررسی شد. به‏این‏منظور با استفاده از سامانۀ اطلاعات جغرافیایی و با روش زمین‏آماری کریجینگ معمولی، پهنه‏بندی کیفی آب زیرزمینی برای دو نوع کاربری کشاورزی و شرب صورت پذیرفت. با هدف ارزیابی مکانی این روش، از داده‏های کیفیت آب زیرزمینی در دشت مه‏ولات-فیض‏آباد واقع در استان خراسان رضوی استفاده شد. نتایج برآورد پارامترهای نسبت جذب سدیم (SAR)، اسیدیته (pH)، شاخص نفوذپذیری آب (PI) و هدایت الکتریکی (EC) که پارامترهای  تأثیرگذار بر ارزیابی آب آبیاری هستند، مبین آن است که آب منطقه برای کشاورزی قابل استفاده است، اما در نظر گرفتن ملاحظات هر گروه از پارامترهای مؤثر بر ارزیابی آب کشاورزی ضروری است. هم‌چنین، بررسی قابلیت آب شرب با استفاده از استانداردهای کیفیت آب ارائه شده توسط سازمان بهداشت جهانی نشان داد که EC و مقدار شاخص کل مواد جامد حل شده (TDS) در بازۀ مطلوب قرار ندارد. بنابراین، باوجود این‌که سایر پارامترهای کیفی برای استفادة شرب در بازۀ مجاز قرار گرفتند، آب محدوده برای استفادة شرب پیشنهاد نمی‏شود.

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