Measuring infiltration rate and hydraulic conductivity in a dry well in a thin overburden

Document Type : Research Paper

Authors

1 univercity

2 Faculty of Earth Sciences,University of Shahrood, Shahrood, Iran

3 Khuzestan Water and Power Authority, Ahvaz, Iran

Abstract

IInfiltration rate and hydraulic conductivity are immensely important parameters for evaluating the hydrology of subsurface environments. Specifically, in disposal wells schemes and in artificial recharge plans both properties must be correctly assessed to better analyze the performance of these installations. In a new research, tanker water and rainfall runoff were injected into a 22.5 m deep well dug in a 15 m thick dry overburden and the underlying impermeable marl bedrock (7.5 m) to evaluate the feasibility of using the well to store winter runoff in the overburden for recovery in the summer. Rates of rise and fall in the hydraulic head were measured, and infiltration rate in various depths were calculated. Also, hydraulic conductivity of the overburden was calculated using particle distribution curves of the overburden samples. Infiltration rate showed close correlation with the hydraulic conductivity. Maximum infiltration rate occurs at depths of 10-11 m; depth of 10 m is the most conductive interval. New findings have come out of this experience including 1. negative correlation between maximum head generated in a specific injection event and the rate of infiltration and 2. the important role of the contact zone between bedrock and the overburden in draining the injected water

Keywords

Article Title [Persian]

اندازه گیری نرخ نفوذ و هدایت هیدرولیکی در یک چاه خشک در نهشته های واریزه ای کم ضخامت

Authors [Persian]

  • غلامعباس کاظمی 2
  • نورعلی داموغ 3
1
2 عضو هیأت علمی دانشگاه شاهرود
3 مشاور ( کارشناس ارشد سازمان آب و برق خوزستان
Abstract [Persian]

نرخ نفوذ و هدایت هیدرولیکی از پارامترهای بسیار مهم برای ارزیابی هیدرولوژی محیط های زیر سطحی می‌باشند. خصوصا در بحث چاه های دفع آبهای اضافی و طرح های تغذیه مصنوعی هر دو ویژگی باید با دقت بررسی شوند تا فهم بهتری از عملکرد این طرحها بدست آید. در این تحقیق جدید، آب تانکر و رواناب بارندگی در یک چاه با عمق 5/22 متر، که 15 متر از آن در نهشته های واریزه ای خشک و 5/7 متر پایین آن در سنگ بستر مارنی نفوذ ناپذیر قرار دارد تزریق گردید تا امکان استفاده از این چاه برای ذخیره رواناب بارندگی در زمستان و بازیافت آن در تابستان مورد ارزیابی قرار گیرد. با استفاده از داده های سرعت بالا آمدن و پایین رفتن هد هیدرولیکی، نرخ نفوذ در اعماق مختلف چاه محاسبه گردید. همچنین هدایت هیدرولیکی نهشته های واریزه ای با استفاده از نمودار توزیع دانه بندی نمونه های براشت شده برآورد گردید. نتایج نشان داد که نرخ نفوذ ارتباط نزدیکی با هدایت هیدرولیکی دارد به طوریکه حداکثر نرخ نفوذ در اعماق 10 و 11 متری و حداکثر هدایت هیدرولیکی در عمق 10 متری می‌باشد. یافته‌های جدید حاصل از این آزمایش شامل 1) وجود ارتباط معکوس بین حداکثر هد ایجاد شده در هر مرحله از تزریق و نرخ نفوذ و 2) نقش کلیدی زون ارتباطی بین سنگ بستر و نهشته های واریزه ای در فرار آب تزریق شده، میباشد.

Keywords [Persian]

  • چاه تغذیه
  • تزریق آب
  • نرخ نفوذ
  • هدایت هیدرولیکی
  • دانه بندی خاک

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Geopersia
Volume 6, Issue 1 - Serial Number 22287825
Winter and Spring
March 2016
Pages 63-73

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History

  • Receive Date: 28 November 2015
  • Revise Date: 25 May 2016
  • Accept Date: 26 June 2016

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