Assessment of water leakage through the right abutment of the Seymareh dam

Document Type : Research Paper

Authors

Department of Structural and Engineering Geology, School of Geology, College of Science, University of Tehran

Abstract

One of the major issues in dam construction is water seepage, post impounding. Assessment and prediction of the amount of water
leakage can be useful in preventing such events. The Seymareh dam has been constructed on the Seymareh River in Ilam province,
Southwest of Iran. The dam controls the floods and generates hydroelectric power. It is already under impoundment and the seepage
problem is being considered. Grout curtains have been employed in two directions at the right abutment of the dam to control the
seepage. The normal reservoir level is 720 m and it has been impounded at the 660 m level up to the point. The purpose of this study is
to predict the amount of water seepage through the right abutment of the dam by using numerical modeling. For this purpose, a new
GW finite element code was used for a two-dimensional simulation of the water seepage. The Levels of the observations wells and the
discharges of the downstream springs on the right river bank are used as the main data for this modeling and its verification.
Assessments show that if the dam impoundment rises to the normal level, significant seepage may occur through the right abutment.

Keywords

Article Title [Persian]

ارزیابی نشت آب از جناح راست سد سیمره

Authors [Persian]

  • اکبر چشمی
  • یعقوب صهبانیا
  • جواد اشجاری
دانشکده زمین شناسی، پردیس علوم، دانشگاه تهران، تهران، ایران
Abstract [Persian]

یکی از مباحث اصلی در ساخت سدها، تراوش آب بعد از آبگیری است. برای جلوگیری از وقوع نشت،ارزیابی و پیش‌بینی مقدار آن مفید است. سد سیمره روی رودخانة سیمره در استان ایلام در جنوب غرب ایران ساخته شده است. هدف از ساخت این سد کنترل سیلاب و تولید برق است. در زمان آبگیری سد به منظور کنترل نشت در جناح راست، پردة تزریق در دو جهت این جناح ساخته شده است. تراز نرمال آب دریاچه 720 متر است. در این زمان آبگیری در تراز 660 متر متوقف شده است. هدف این مقاله تخمین مقدار نشت از جناح راست سد با استفاده از روش‌های عددی است. بدین منظور از نرم‌افزار اجزای محدود GW استفاده شده است که مدلسازی نشت آب را به‌صورت دو بعدی انجام می‌دهد. تراز چاه‌های مشاهده شده و دبی چشمه‌های پایین‌دست در جناح راست رودخانه داده‌های اصلی برای مدلسازی و ارزیابی صحت مدل ارائه شده استفاده شد. نتایج ارزیابی‌ها نشان می‌دهد که اگر آبگیری به تراز نرمال سد برسد ممکن است نشت قابل توجهی در جناح راست سد اتفاق بیفتد.

Keywords [Persian]

  • سد سیمره
  • مدلسازی عددی
  • نرم‌افزار GW
  • نشت

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Geopersia
Volume 4, Issue 2 - Serial Number 2
summer & Autumn
October 2014
Pages 213-225

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History

  • Receive Date: 17 March 2014
  • Revise Date: 13 January 2015
  • Accept Date: 07 December 2014

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