تاثیر نشت گاز دی اکسید کربن بر نوسان غیرعادی سطح آب زیرزمینی در آبخوان های شمال استان همدان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری هیدروژئولوژی/گروه زمین شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی.

2 استاد / گروه زمین شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی.

3 استادیار/ گروه زمین شناسی معدنی و آب، دانشکده علوم زمین، دانشگاه شهید بهشتی.

چکیده

در تعدادی از آبخوان های نیمه شمالی استان همدان کف شکنی چاه های بهره برداری در داخل سنگ کف، منجر به نشت گاز دی اکسید کربن به داخل آبخوان شده است. بررسی داده های سطح آب زیرزمینی در نزدیکی چاه های گازدار، بیانگر وجود رفتار غیرعادی در نوسان سطح آب زیرزمینی می باشد. مقایسه هیدروگراف چاه های مشاهده ای، شاخص تورم واریانس و شواهد صحرایی در مناطق گازدار با مناطق فاقد گاز نشان می دهد که رفتار غیرعادی مشاهده شده در نوسان سطح آب، تحت تاثیر متغیرهای بارش و برداشت از آبخوان نمی باشد. با توجه به ظرفیت خنثی کنندگی بالای pH در آبخوان ها و کاهش همبستگی PCO2 با pH و TDS در آب های گازدار نسبت به آب های فاقد گاز، عامل اصلی افزایش شوری در آب های گازدار، نفوذ آب شور عمیق همراه با گاز به داخل آبخوان می باشد. در واقع کف شکنی چاه های بهره برداری در داخل سنگ کف، از طریق کاهش فشار هیدرواستاتیک، سبب ورود آب شور گازدار به داخل آبخوان می شود. با شروع بهره برداری از چاه ها در فصل آبیاری، میزان تغذیه آبخوان توسط آب شور بر میزان تخلیه آن توسط چاه ها پیشی گرفته و در نتیجه سطح آب زیرزمینی در اطراف چاه های گازدار بالا می آید.

کلیدواژه‌ها


عنوان مقاله [English]

Impact of CO2 Gas Leakage on Anomalous Groundwater Level Fluctuation in Northern Aquifers of Hamadan Province

نویسندگان [English]

  • Behzad Delkhahi 1
  • Hamid Reza Nassery 2
  • Farshad Alijani 3
1 Ph.D. Student in Hydrogeology, Department of Minerals and Groundwater Resources, School of Earth Sciences, Shahid Beheshti University, Tehran, Iran.
2 Professor, Department of Minerals and Groundwater Resources, School of Earth Sciences, Shahid Beheshti University, Tehran, Iran.
3 Assistant Professor, Department of Minerals and Groundwater Resources, School of Earth Sciences, Shahid Beheshti University, Tehran, Iran.
چکیده [English]

There are a number of aquifers in the northern half of Hamadan province that, deepening of water wells into the bedrock resulted in CO2 leakage into the aquifers. Groundwater level data near gas charged water wells indicating abnormal behavior in groundwater level fluctuation. Comparison of observation well hydrographs, variance inflation factor and field evidence in the gas charged and background areas shows that the observed abnormal behavior in water level fluctuation is not influenced by rainfall and groundwater pumpage variables. Due to high pH buffering capacity in the aquifers and decrease of PCO2 correlation with pH and TDS in the gas charged waters compared to the background ones, the main factor for increasing salinity in the gas charged waters is the intrusion of deep saline water with gas into the aquifers. In fact, the deepening of the wells into the bedrock, by lowering hydrostatic pressure, causes gas-rich saline water to enter the aquifer. As wells begin pumping during the irrigation season, the aquifer recharge rate by saline water exceeds the discharge rate of the wells, resulting in elevation of groundwater levels around the gas charged wells.

کلیدواژه‌ها [English]

  • CO2 gas leakage
  • Abnormal groundwater level fluctuation
  • Saline water intrusion
  • Hydrostatic pressure
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