مدلسازی عددی آبکشی محل اجرای حوضچه پمپاژ در روش آبگیری باز از دریاها با استفاده از نرم افزار MODFLOW

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیات علمی گروه مهندسی عمران، دانشکده فنی و مهندسی ، دانشگاه گلستان

2 عضو هیات علمی دانشگاه خلیج فارس بوشهر

چکیده

حوضچه پمپاژ، یکی از مهمترین سازه­ها در روش آبگیری باز از دریاها بوده که اجرای آن مستلزم پایین آوردن تراز آب زیرزمینی با رویکرد عدم نفوذ آب دریا به محل اجرای آن می­باشد. در این مقاله دو رویکرد متداول کاهش تراز آب زیرزمینی به‌وسیله چاه­های آبکش بزرگ و چاه­های آبکش نقطه­ای جهت اجرای حوضچه پمپاژ کارخانه آب­شیرین­کن شهر بوشهر، با کمک نرم‌افزار MODFLOWبه‌عنوان شبیه‌ساز، مورد بررسی قرار گرفت. در این تحقیق با در نظر گرفتن تعداد 26 عدد چاه آبکشی بزرگ (با دبی برداشت 5/0 تا 5/5 لیتر بر ثانیه) و 119 عدد چاه نقطه­ای (با دبی برداشت 1/0 تا 0/1 لیتر بر ثانیه)، نتایج نشان‌دهنده کارایی هر دو روش بوده و همچنین با آنالیز حساسیت نسبت به میزان نفوذپذیری خاک محل به‌عنوان پارامتر متغیر در زمان و مکان، مشخص شد در مواقع عدم قطعیت نسبت به پارامتر نفوذپذیری، سیستم آبکشی نقطه­ای دارای کارایی بهتری می­باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical modeling of dewatering system to construct pump basins in open sea water intake system by MODFLOW

نویسندگان [English]

  • morteza zanganeh 1
  • Seyed Hamed Meraji 2
1 Golestan Universirty
2 Khalije Fars University
چکیده [English]

Pump basins are important structures in open sea water intakes. Dewatering construction site of these structures with no leakage inside the site is an essential issue. Throughout this paper, two common aspects of dewatering systems, namely big wells and well points are evaluated to make the construction site of the pump basin ready at the intake system of Bushehr desalination installations. To achieve this, MODFLOW software was employed to model the dewatering systems with results demonstrating the performance of the considered dewatering methods. According to the observed results, to have an efficient dewatering system, a number of about 26 wells as high capacity ones (well discharges ranging from 0.5 to 5.5 lit/s)are needed vs. 119 well points (well discharges ranging from 0.1 to 1.1 lit/s). In addition, sensitivity analysis of the system, as regards the variation of soil conductivity (in both space and time) proves that the well point system is more efficient than the high capacity well system, for dewatering an uncertain site. 

کلیدواژه‌ها [English]

  • Dewatering
  • big well
  • well point
  • Bushehr beach
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