مقایسه روش‌های ژئوالکتریک، الکترومغناطیس و ورویچ در تعیین سطح آب شور و شیرین آبخوانهای ساحلی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی آب، دانشگاه علوم کشاورزی و منبع طبیعی ساری، ساری، ایران

2 دانشیار، گروه مهندسی آب، دانشگاه علوم کشاورزی و منبع طبیعی ساری، ساری، ایران

3 استادیار، گروه ژئوفیزیک، دانشگاه آزاد اسلامی، واحد چالوس، چالوس، ایران

چکیده

افت سطح آب زیرزمینی و پیشروی آب شور دریا در پی برداشت‌های بی‌رویه و حفر تعداد زیاد چاه، اهمیت شناسایی دقیق‌تر آبخوان-های ساحلی را دوچندان می‬کند.. در این تحقیق تعیین سطح تداخل آب شور و شیرین در آبخوان‌های ساحلی غرب و شرق شهرستان بابلسر (استان مازندران) به‌وسیله روش‌های ژئوالکتریک، الکترومغناطیس و معادلات ورویچ مورد مقایسه قرار گرفت. به‌علت عدم وجود اطلاعات هیدروژئولوژیکی کافی در این منطقه (همانند سایر مناطق استان)، نتایج حاصل از معادلات ورویچ دقت بالایی نداشته اما روش ژئوالکتریک دارای دقت نسبتا بیشتری از آن است. روش الکترومغناطیس با داشتن بیشترین همبستگی (R=**97/0و**81/0؛ CCC=95/0و80/0) و کمترین خطا (ME=22/2-و28/0؛ RMSE=83/4و96/1) به‬ترتیب در مناطق غرب و شرق منطقه و عدم معنی‬داری آزمون t بین داده‌های تخمینی و واقعی، دارای بیشترین دقت بود و به‌واسطه سرعت بالاتر، اطمینان‬پذیری بیشتر و استفاده کمتر از نیروی انسانی، کارآمدی بالایی را برای به‬روزرسانی اطلاعات تداخل آب شور و شیرین در آبخوان‬های ساحلی نشان داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of geoelecteric, electromagnetic and Verruijt equations for determination of the subsurface saline and fresh interface in coastal aquifer

نویسندگان [English]

  • Mehdi Emadi 1
  • Ali Shahnazari 2
  • Zohre Sadat ReyaziRad 3
1 Ph.D. Student, Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.
2 Associate Professor, Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
3 Assistant Professor, Department of Geophysics, Islamic Azad University, Chalus Branch. Chalus, Iran
چکیده [English]

Due to the downfall of groundwater table caused by the drilling of several illegal wells, unlimited groundwater extraction and sea water intrusion, the precise identification of saline groundwater zone in shorelines is highly crucial. This research was conducted to compare three different methods (geoelecteric, electromagnetic, Verruijt equations) to detect the interface of subsurface fresh and saline water in western and eastern part of Babolsar city, northern Iran. Due to the insufficient hydrogeological data in the study area such as occurred spread across the Mazandaran province, the Verruijt equations could not predict the saline and fresh water interfaces precisely, but the geoelecteric method showed relatively higher precision. The results of both studied sites (eastern and western part of Babolsar city) were approximately identical. The electromagnetic method with the highest significant correlation (R=0.97 and 081; CCC=0.95 and 0.80) and the lowest errors (ME=-2.22 and 0.28; RMSE=4.83 and 1.96) respectively in the western and eastern part of the area and also the insignificant t-test was identified as the best approach for accurate prediction of the saline and fresh water interfaces. Considering the insufficient hydrogeological data in shoreline of Mazandaran province and due to the high performance, rapid determination and more reliability of the electromagnetic-based data, this method could be recommended for determination of the subsurface saline and fresh interface in coastal aquifer.

کلیدواژه‌ها [English]

  • Saline water
  • Groundwater
  • electromagnetic
  • geoelectric
  • coastal aquifers

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تحقیقات آب و خاک ایران
دوره 49، شماره 5
آذر و دی 1397
صفحه 1159-1170

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