Evaluating hydrogeochemistry and turbidity problem of a carbonate aquifer, Shiraz, Iran

Document Type : Research Paper


1 Faculty of Earth Sciences, Shahrood University of Technology, Shahrood

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

3 Faculty of Earth Sciences, Shahrood University of Technology


Important karstic aquifers exist in west and southwest of Iran. Mansour-Abad Karstic region is located in Shiraz, southwest of Iran. It supplies the drinking water for the whole area by 4 pumping water wells, some of which have water turbidity problem. The present research aims to assess the hydrogeochemistry and turbidity problem in the karstic water production wells. The EC varies between 703 (in well No.1) and 1096 µmohs/cm (in well No.4). All water wells have similar ion concentration trend, indicating the same origin. The dissolution of gypsum during dedolomitization process induces the transformation of dolomite to calcite in the study area, especially in well No.4. The concentrations of most trace elements in the study area are lower than the standard value. Bacteriological water parameters are outside the accepted limits recommended by WHO for drinking water. Wells No. 1, 2 and 3 have turbidity values greater than limited values for drinking water which is about 5 TU; therefore, only well No.4 is used as drinking water resource in the study area. Most probably, interference of clay mineral layers with groundwater flow is one of the main causes of turbidity in some wells.


Article Title [Persian]

بررسی هیدروژئوشیمی و توربیدیتی سفره کارستی در شیراز، ایران

Abstract [Persian]

سفره های کارستی مهمی در غرب و جنوب غرب ایران وجود دارد که یکی از آنها منطقه کارستی منصور آباد در استان فارس-شیراز می باشد. آب شرب این منطقه توسط چهار حلقه چاه پمپاژ از این سفره کارستی تامین می گردد که متاسفانه آب برخی از این چاهها دچار مشکل کدورت شده اند. مقدار هدایت الکتریکی در این منطقه از 703 تا 1096 µmohs/cm متغیر می باشد. روند تغییرات غلظت یونهای اصلی در تمامی چاهها مشابه بوده که دلیل بر یکسان بودن منشا آنها دارد. یکی از فرایندهای مهم ژئوشیمایی در منطقه دولومیت زدایی بوده که در اثر انحلال ژیپس و بالتبع انحلال دولومیت و رسوب کلسیت اتفاق افتاده است. مقادیر غلظت فلزات سنگین در آبهای منطقه مورد مطالعه کم و در حد شرب و استاندارد جهانی می باشد. از نظر بیولوژیکی، این آبها استاندارد لازم جهانی جهت شرب را دارند. آب چاههای شماره 1، 2 و 3 با توربیدیتی حدود 5 NTU دارای مشکل کدورت بوده و بالاتر از حد استاندارد جهت شرب می باشند؛ بنابراین فقط چاه شماره 4 جهت شرب در این پمپاژ شده و مورد استفاده قرار می گیرد. به احتمال زیاد بدلیل وجود بین لایه های رسی در سازند کارستی منطقه و انحلال و فرسایش آنها در طی جریان آب زیرزمینی در بین آنها، می تواند دلیل اصلی بروز مشکل کدورت در آب این چاهها در نظر گرفت.

Keywords [Persian]

  • آب شرب
  • هیدروژئوشیمی
  • سفره های کارستی
  • میکروارگانیسم توربیدایتی
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