ارزیابی فصلی پتانسیل تغذیه‌گرایی و لایه‌بندی حرارتی سد استقلال

نوع مقاله : مقاله پژوهشی

نویسنده

گروه مهندسی محیط زیست، دانشکده مهندسی آب و محیط‌زیست دانشگاه شهید چمران اهواز، اهواز، ایران.

10.22059/jwim.2024.365447.1105

چکیده

در این پژوهش، وضعیت کیفیت آب مخزن استقلال با تمرکز بر ارزیابی پتانسیل تغذیه‌گرایی در بازه پنج‌ساله موردبررسی قرار گرفت. برای شبیه‌سازی روزانه متغیرهای کلیدی مؤثر بر وضعیت مغذی‌شدن و شکوفایی جلبکی از جمله دما، اکسیژن محلول، جلبک، فسفات، آمونیوم و نیترات، از مدل دو بعدی CE-QUAL-W2 استفاده شد. با توجه به تغییرات قابل‌توجه حجم آب ذخیره‌شده در مخزن سد، تحلیل شرایط حاکم بر مخزن سد به‌صورت فصلی انجام گرفت. نتایج حاکی از وجود الگوی پیچیده‌ای از پویایی‌ها و ارتباطات چرخه غذایی در مخزن است. در فصل بهار و تابستان، تغییرات دمایی شدید در عمق آب نشان از لایه‌بندی حرارتی قوی دارد. غلظت اکسیژن محلول در رولایه و زیرلایه به‌علت عواملی مانند مصرف اکسیژن توسط جلبک‌ها، محدودیت اختلاط تحت تأثیر باد، لایه‌بندی حرارتی و زمان‌ماند بالا دارای اختلاف قابل‌توجهی است. در پاییز، با توجه به کاهش ورود آب در تابستان و افزایش تبخیر، حجم آب کاهش یافته و با سردشدن هوا، لایه‌بندی حرارتی کاهش می‌یابد. با ورود جریان‌های سیلابی در زمستان، حجم آب افزایش یافته و به‌علت کاهش دما، اختلاط کامل ایجاد می‌شود. این موضوع منجر به بهبود شرایط اکسیژن محلول می‌شود. اما، بار ورودی مواد مغذی را افزایش می‌دهد. نتایج شبیه‌سازی و ارزیابی معیارهای تغذیه‌گرایی نشان می‌دهند که پتانسیل تغذیه‌گرایی در اغلب ماه‌ها وجود دارد. وجود برنامه پایش دقیق با تعیین تواتر و محل بهینه نمونه‌برداری، کنترل ورود مواد مغذی از طریق مدیریت حوضه آبریز و تنظیم زمان‌ماند می‌توانند به‌عنوان راه‌کارهای مؤثر برای بهبود وضعیت مخزن محسوب گردند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Seasonal assessment of eutrophication potential and thermal stratification in Esteghlal reservoir

نویسنده [English]

  • Hamid Abdolabadi
Department of Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
چکیده [English]

This study investigates the water quality dynamics of Esteghlal Reservoir over a five-year period, with a specific emphasis on evaluating its eutrophication potential. We employed a two-dimensional water quality model, CE-QUAL-W2, to simulate daily variations in key variables, including temperature, dissolved oxygen, algae, phosphate, ammonia, and nitrate, which influence nutrient conditions and eutrophication. Due to significant fluctuations in the reservoir's water volume, water quality analysis was conducted seasonally. The results reveal a complex dynamic pattern within the nutrient cycle in the reservoir. In spring and summer, temperatures vary throughout the water column, indicating strong thermal stratification. There is a notable difference in dissolved oxygen concentration between the epilimnion and hypolimnion due to factors such as oxygen consumption by algae, limited wind-induced mixing, thermal stratification, and an extended detention time. In autumn, a reduction in inflow during the summer and evaporation lead to a decrease in water volume. This, along with a reduction in temperature, weakens thermal stratification. With the influx of floods in winter, water volume increases, and complete mixing occurs due to cooling. This provides a suitable environment to improve dissolved oxygen levels. However, it also leads to an increase in nutrient input. Simulation results and an assessment of nutrient criteria underscore the presence of eutrophication potential in most months. A well-defined monitoring program with optimized sampling frequency and location, coupled with the control of nutrient input through watershed management and detention time adjustment, can be considered effective strategies for improving the reservoir's condition.

کلیدواژه‌ها [English]

  • CE-QUAL-W2
  • Dissolved Oxygen
  • Esteghlal Dam
  • Eutrophication
  • Thermal stratification

مراجع

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مدیریت آب و آبیاری
دوره 14، شماره 1
فروردین 1403
صفحه 55-74

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