برآورد تبادل آب بین تالاب‏ و آبخوان (مطالعۀ موردی تالاب‏ کانی‏برازان)

نوع مقاله: پژوهشی

نویسندگان

1 استادیار، دانشکدۀ مهندسی منابع آب، دانشگاه تربیت مدرس

2 دانشجوی دکتری، دانشکدۀ مهندسی عمران، دانشگاه تهران

3 کارشناس ارشد، دانشکدۀ مهندسی منابع آب، دانشگاه تربیت مدرس

چکیده

چکیده
ارتباط و اندرکنش آب سطحی و آب زیرزمینی می‏تواند بین پهنه‏های آب سطحی (مانند رودخانه‏ها، دریاچه‏ها و تالاب‏ها) و منابع آب زیرزمینی رخ دهد. کمّی‌کردن مقدار تبادل آب بین تالاب و آبخوان از مراحل مهم در مطالعاتی مانند بیلان آب و تعیین نیاز‏های زیست‏محیطی است. در این مطالعه به‌منظور برآورد نیاز آبی تالاب کانی‏برازان واقع در حاشیۀ جنوبی دریاچۀ ارومیه، روی مؤلفۀ آب زیرزمینی تمرکز شده است. نتایج این مطالعه بیان می‌کند که در دورۀ زمانی بررسی‌شده از سال 1377 تا 1394، با توجه به آستانۀ گرادیان هیدرولیکی، تالاب کانی‏برازان همواره از منابع آب زیرزمینی تغذیه شده است. در سال‏های 1377، 1381 و 1394 مقادیر تغذیۀ تالاب از منابع آب زیرزمینی بیشترین مقدار را داشته و به‌ترتیب برابر با 11/4، 09/5 و 78/3 میلیون مترمکعب در سال برآورد شده است. مقدار متوسط سالانۀ عمق این تالاب کمتر از 16 سانتی‌متر برآورد شده است. اثر زهکش‏ها، کانال‏ها و انهار سنتی بر تالاب هم طی دورۀ زمانی یادشده بررسی شده‏اند. نتایج نشان می‏دهد این منابع آبی تأثیر مهمی در تأمین آب تالاب دارند. بر اساس داده و اطلاعات موجود، برای مثال در سال‏های 1385 و 1394، چنانچه اثر زهکش‏ها، کانال‏ها و انهار سنتی بر تالاب‏ در نظر گرفته نشود، به‌ترتیب کاهشی حدود 15 و 30 درصد در حجم آب تالاب تخمین زده می‌شود.
 
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Estimation of wetland-aquifer exchanges (Case Study: Kaniborazan wetland)

نویسندگان [English]

  • Hamed Ketabchi 1
  • Davood Mahmoodzadeh 2
  • Reza Farhoudi Hafdaran 3
1 Assistant Professor, Department of Water Resources Engineering, Tarbiat Modares University
2 PhD Student, Department of Civil Engineering, University of Tehran
3 MSc., Department of Water Resources Engineering, Tarbiat Modares University
چکیده [English]

Surface water and groundwater interactions can occur between surface water bodies (such as rivers, lakes, and wetlands) and groundwater resources. Quantifying water exchange between a wetland and an underlying aquifer is an important task for studies in such fields as water budgets and environmental water requirements. In this study, the groundwater component from controlling factors on wetland water level is considered to determine the water requirements of Kaniborazan wetland, located at the southern part of Urmia Lake. The results of the present study indicate that during the assessment period of 1998-2015, Kaniborazan wetland has been always recharged from underlying groundwater resources considering the hydraulic gradient threshold of this wetland. These recharge values have been maximum for 1998, 2002, and 2015 with the annual value of 4.11, 5.09, and 3.78 MCM, respectively. The mean annual value of this wetland depth has been estimated to be less than 16 cm. The impacts of drainage system, channels, and traditional streams have been investigated on this wetland during the assessment period. The obtained results show that these sources have a significant effect on the water supply of the wetland. Based on the available data and information, for example for 2006 and 2015, not taking the impacts of drainage system, channels, and traditional streams on this wetland into account will lead to the wetland water volume reduction of about 15% and 30%, respectively.

کلیدواژه‌ها [English]

  • Aquifer
  • drainage system
  • Groundwater Resources
  • water exchanges
  • wetland
 
منابع
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