کاهش تبخیر از مخازن ذخیره آب با استفاده از پوشش های شناور در اصفهان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی سابق کارشناسی ارشد آبیاری و زهکشی گروه مهندسی آب، دانشکده کشاورزی، دانشگاه صنعتی اصفهان

2 دانشگاه صنعتی اصفهان

چکیده

پوشش‌های شناور یکی از روش­های کاهش تبخیر از سطح آب می‌باشند. هدف این تحقیق بررسی اثر پوشش­های شناور در کاهش تبخیر از سطح مخازن آب می­باشد. در این تحقیق از سه نوع پوشش (پلی‌کربنات، پلی‌استایرن و پلی‌استایرن با روکش آلومینیوم) بر روی سطح 3 مخزن آب (با سه تکرار برای هر پوشش) استفاده شد. تغییرات عمق آب مخازن پوشش­دار و بدون پوشش در بازه زمانی آذر 93 تا آبان 94 اندازه‌گیری شد. سپس مقادیر تبخیر اندازه­گیری شده در قالب طرح بلوک کامل تصادفی در نرم‌افزار آماری SAS آنالیز شد و مقایسه میانگین آن­ها در سطح احتمال 99 درصد (01/0P<) و با آزمون چند دامنه­ای دانکن انجام شد. نتایج نشان داد مقدار کاهش تبخیر نسبت به مخزن شاهد برای سه پوشش پلی­استایرن، پلی­استایرن با آلومینیوم و پلی کربنات به ترتیب 6/85، 83 و 5/76 درصد می­باشد. این اعداد نشان‌دهنده عملکرد خوب سه پوشش در کاهش تبخیر از سطح آب می­باشد. حداکثر مقدار تبخیر روزانه از مخزن شاهد 0/13 میلیمتر و در مورد پوشش­های پلی‌کربنات، پلی‌استایرن و پلی­‌استایرن با روکش‌آلومینیوم، مقدار تبخیر روزانه به ترتیب 1/3، 3/2 و 9/2 میلیمتر در تیرماه بود. پوشش پلی­استایرن نسبت به پلی­کربنات هزینه کمتری داشت، اما پوشش پلی­کربنات در پایان دوره تحقیق دوام بهتری از خود نشان داد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Reduction of Evaporation from Water Reservoirs Using Floating Covers in Isfahan

نویسندگان [English]

  • Elham Mazaheri 1
  • Jahangir Abdei Koupai 2
1 . Former MSc Student of Irrigation and Drainage, Dept. of Water Eng., College of Agriculture, Isfahan. University. of Technology
2 Isfahan University of Technology
چکیده [English]

The aim of this study was to evaluate the influence of Floating Covers on the reducing evaporation from free water surface. In this study three types of covers (Polystyrene, Polystyrene with aluminum and polycarbonate) on the surface of 3 reservoirs (with three repetitions for each covers) were used. Changes in water depth of covered and uncovered reservoir were measured in one year from October 2014 until November 2015. Then the evaporation results of covered and uncovered trials were analyzed in form of a randomized complete block design with three replications using SAS software at confidence level 99% (P<0.01) and Duncan test. The rate of evaporation reduction using Polystyrene, Polystyrene with aluminum and Polycarbonate, are 85.60%, 83% and 76.5%, respectively. These amounts represent a good performance of three covers in reducing evaporation from reservoirs. Although Polycarbonate cover represents better and proper performance in relation to durability.

کلیدواژه‌ها [English]

  • Polystyrene
  • Polystyrene with Aluminum Cover
  • Polycarbonate
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