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ارزیابی سالیانه ضریب نرخ بازهوادهی رودخانه کارون (بازه ی ایستگاه ملاثانی تا کوت امیر) | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 19، دوره 49، شماره 4، مهر و آبان 1397، صفحه 925-943 اصل مقاله (814.84 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2018.245357.667789 | ||
| نویسندگان | ||
| بنفشه عبداللهی1؛ کیومرث ابراهیمی* 2؛ شهاب عراقی نژاد3؛ عبدالمجید لیاقت4 | ||
| 1گروه مهندسی آبیاری و آبادانی / دانشگاه تهران | ||
| 2گروه مهندسی آبیاری و آبادانی | ||
| 3گروه مهندسی آبیاری و آبادانی، دانشگاه تهران | ||
| 4استاد، دانشگاه تهران | ||
| چکیده | ||
| یکی از مهمترین پارامترهای مدیریت کیفی منابع آب سطحی میزان اکسیژن محلول آن میباشد. ضریب نرخ بازهوادهی توصیف‌کننده جذب فیزیکی اکسیژن از اتمسفر به داخل آب است. مقادیر اکسیژن محلول در مدلسازی کیفی حساسیت زیادی حتی به تغییرات کم ضریب نرخ بازهوادهی داشته و برآورد صحیح آن بسیار مهم است. هدف اصلی مقاله حاضر انتخاب بهترین روابط برآورد ضریب نرخ بازهوادهی از بین 29 رابطه پرکاربرد پیشنهادی بر اساس مدلسازی اکسیژن محلول برای رودخانه کارون در فصول مختلف میباشد. بدین منظور 91 کیلومتر از رودخانه کارون و از ایستگاه ملاثانی تا کوت امیر انتخاب شد. از دادههای ماهانه کمی و کیفی این رودخانه در سالهای آبی 90-1389 و 91-1390 و مدل Qual2Kw5.1 استفاده شد. نتایج نشان میدهد که رابطه TH در فصل پائیز، رابطه LA در فصول زمستان و بهار و رابطه JH در فصل تابستان با RMSEهایی به ترتیب برابر با 35/0، 48/0، 29/0 و 29/0 و MBEهایی به ترتیب برابر با 78/1، 43/0، 47/2- و 67/0- بین اکسیژن محلول شبیهسازی شده و مشاهدهای در هر فصل دارای بهترین برآورد از ضریب نرخ بازهوادهی بوده و مقادیر ضریب نرخ بازهوادهی این رودخانه در فصول ذکر شده به ترتیب برابر 62/0، 23/0، 33/0 و 59/1 یک بر روز میباشد. | ||
| کلیدواژه‌ها | ||
| کارون؛ ضریب نرخ بازهوادهی؛ اکسیژن محلول؛ Qual2Kw5.1 | ||
| عنوان مقاله [English] | ||
| Annual Investigation of the Karun River Reaeration Rate Coefficient (From Mollasani to Kot-e Amir) | ||
| نویسندگان [English] | ||
| Banafsheh Abdollahi1؛ Kumars Ebrahimi2؛ Shahab Araghinejad3؛ Abdolmajid Liaghat4 | ||
| 1Irrigation and Reclamation Engineering Department | ||
| 2Irrigation and Reclamation Engineering Department / University of Tehran | ||
| 3Irrigation and Reclamation Engineering Department | ||
| 4Irrigation and Reclamation Engineering Department, university of Tehran | ||
| چکیده [English] | ||
| One of the most important factors of the water quality management is the rate of dissolved oxygen. Reaeration coefficient describes the rate of absorption of oxygen from atmosphere into water. The rate of dissolved oxygen in water quality modelling shows great sensitivity even to the smallest changes in reaeration rate coefficient. The main target of this paper is to evaluate the best equations of the reaeration rate coefficient, among 29 most used equations based on the dissolved oxygen modelling for Karun River, IRAN, in different seasons. In order to achieve this aim 91 km length of river, from Molasani to Kut-Amir stations was modeled. Modelling was performed based on monthly quality and quantity data of this river, from 2010 to 2011 and also 2011-2012, involving Qual2Kw5.1 software. According to the results Thyseen (TH) equation in the autumn, Lau (LA) in winter and spring and finally Jha (JH) equation in summer have the best estimations for the reaeration rate coefficient, while the accuracy of the modeled DO values were evaluated using RMSE between simulated and observed data, which were equal to 0.35, 0.48, 0.29 and 0.29, respectively. Also the MBE values were equal to 1.78, 0.43, -2.47 and -0.67, respectively, which show very good agreement. Finally, the relevant modeled reaeration rate coefficients for the above mentioned seasons were equal to 0.62, 0.23, 0.33 and 1.59 (1/day), respectively. | ||
| کلیدواژه‌ها [English] | ||
| Karun, Reaeration Rate Coefficient, Dissolved Oxygen, Qual2Kw5.1 | ||
| مراجع | ||
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