مدل‌سازی اکسیژن محلول در مخزن اکباتان با استفاده از مدل CE-QUAL-W2

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران.

10.22059/jwim.2023.359526.1077

چکیده

این پژوهش، با استفاده از مدل هیدرودینامیکی CE-QUAL-W2، به بررسی و شبیه‌سازی پارامتر اکسیژن محلول (DO) در مخزن سد اکباتان و تحت تأثیر تغییرات لایه‌بندی حرارتی و دما می‌پردازد. مخزن اکباتان در تأمین آب شرب و کشاورزی شهرستان همدان نقش مهمی ایفا می‌کند. از این‌رو، بررسی کیفیت آب آن امری ضروری به‌نظر می‌رسد. نتایج نشان می‌دهد که مدل CE-QUAL-W2 با درنظرگرفتن حجم و هندسه مخزن و پارامترهای هواشناسی، به‌خوبی تغییرات دمایی مخزن را شبیه‌سازی می‌کند. با توجه به این‌که اکسیژن محلول تحت تأثیر لایه‌بندی حرارتی قرار دارد، ارتباط میان این دو پارامتر موردبررسی قرار گرفته و امکان ارزیابی کیفیت آب از طریق لایه‌بندی حرارتی مخزن ارائه شده است. نتایج نشان می‌دهند که لایه‌بندی حرارتی در مخزن اکباتان دارای دوره‌های تغییر لایه‌بندی حرارتی است و در فصل تابستان کامل می‌شود، درحالی‌که در فصل‌های پاییز و اوایل زمستان اختلاط کامل رخ می‌دهد. این تغییرات هم‌چنین تأثیری بر لایه‌بندی DO در مخزن دارند. با افزایش 68 درصدی دما، غلظت DO حدود 5/37 درصد کاهش می‌یابد و با کاهش دما، غلظت DO به همین نسبت افزایش می‌یابد. علاوه‌بر این، نتایج پژوهش نشان می‌دهند که تغییرات دمای هوا تأثیر قابل‌توجهی بر غلظت DO در مخزن دارد. تغییر دما منجر به کاهش چگالی آب و کاهش حلالیت اکسیژن در آب می‌شود، که به‌نوبه خود منجر به کاهش غلظت DO در آب مخزن گردیده و این مسأله به‌طور گسترده‌ای در مطالعات محیط زیست و مدیریت منابع آب موردتوجه قرار دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Modeling of Dissolved Oxygen in Ekbatan Reservoir Using CE-QUAL-W2 Model

نویسندگان [English]

  • Seyedeh Zahra Hassani
  • Parisa-Sadat Ashofteh
Department of Civil Engineering, University of Qom, Qom, Iran.
چکیده [English]

This research, using the CE-QUAL-W2 hydrodynamic model, investigates and simulates the dissolved oxygen (DO) parameter in the Ekbatan dam reservoir under the influence of thermal stratification and temperature changes. Ekbatan Reservoir plays an important role in providing drinking and agriculture water in Hamedan city, so checking its water quality seems essential. The results show that the CE-QUAL-W2 model simulates well the temperature changes of the reservoir by considering the volume and geometry of the reservoir and meteorological parameters. Due to the fact that dissolved oxygen is affected by thermal stratification, the relationship between these two parameters has been investigated and the possibility of evaluating water quality through thermal stratification of the reservoir has been presented. The results show that thermal stratification in Ekbatan reservoir has periods of thermal stratification change and is complete in summer, while complete mixing occurs in autumn and early winter. These changes also affect the DO stratification in the reservoir. With a 68 percent increase in temperature, the DO concentration decreases by about 37.5 percent, and with a decrease in temperature, the DO concentration increases in the same proportion. In addition, the research results show that changes in air temperature have a significant effect on the concentration of DO in the reservoir. The change in temperature leads to a decrease in the density of water and a decrease in the solubility of oxygen in water, which in turn leads to a decrease in the concentration of DO in the reservoir water, and this issue is widely considered in environmental studies and water resources management.

کلیدواژه‌ها [English]

  • CE-QUAL-W2 model
  • Dam reservoir
  • Dissolved oxygen
  • Thermal stratification

مراجع

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مدیریت آب و آبیاری
دوره 13، شماره 4
دی 1402
صفحه 983-1000

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