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مقایسه روشهای ژئوالکتریک، الکترومغناطیس و ورویچ در تعیین سطح آب شور و شیرین آبخوانهای ساحلی | ||
تحقیقات آب و خاک ایران | ||
مقاله 17، دوره 49، شماره 5، آذر و دی 1397، صفحه 1159-1170 اصل مقاله (1.3 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2018.238567.667725 | ||
نویسندگان | ||
مهدی عمادی1؛ علی شاهنظری* 2؛ زهره سادات ریاضی راد3 | ||
1دانشجوی دکتری، گروه مهندسی آب، دانشگاه علوم کشاورزی و منبع طبیعی ساری، ساری، ایران | ||
2دانشیار، گروه مهندسی آب، دانشگاه علوم کشاورزی و منبع طبیعی ساری، ساری، ایران | ||
3استادیار، 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 | ||
آب شور؛ آب زیرزمینی؛ الکترومغناطیس؛ ژئوالکتریک؛ آبخوان ساحلی | ||
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 Emadi1؛ Ali Shahnazari2؛ Zohre Sadat ReyaziRad3 | ||
1Ph.D. Student, Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran. | ||
2Associate Professor, Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University, Sari, Iran | ||
3Assistant 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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