fa مدل‌سازی دوبعدی هیدرولیک جریان در رودخانه کارون عمومی Ggeneral پژوهشي Research <div style="text-align: justify;"><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مدل</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی ارائه شده برای شبیه</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ساز</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی هیدرولیک جریان در رودخانه</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها،</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">اغلب</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">جر</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یان را به</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">صورت</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> یک</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بعد</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی فرض کرده و پارامترهای هیدرولیکی را بر اساس معادلات یک</span></span></strong><strong><span dir="LTR"><span style="font-size:9.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بعدی سنت‌ونانت شبیه</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ساز</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی می‌کنند. در این پژوهش از مدل دوبعدی </span></span></strong><strong><span dir="LTR"><span style="font-size:9.0pt;">HEC- RAS</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> برای شبیه</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ساز</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی جریان در رودخانه کارون و در حد فاصل ایستگاه ملاثانی تا فارسیات استفاده شده است. به‌منظور آماده‌سازی نقشه ارتفاعی با استفاده از تصویر ماهواره</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ا</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی منطقه مورد مطالعه، از سیستم اطلاعات جغرافیایی (</span></span></strong><strong><span dir="LTR"><span style="font-size:9.0pt;">GIS</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">) و اطلاعات پروفیل</span></span></strong><strong><span style="font-size:11.0pt;">‌</span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی بستر رودخانه استفاده شد. نتایج مدل</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ساز</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی در قوس</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی مورد مطالعه، نشان می</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دهد</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> که مقادیر حداکثر سرعت در قوس بیرونی اتفاق می</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">افتد</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;"> که با مکانیزم جریان در قوس</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">مطابقت</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دارد</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">. </span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بر</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">اساس</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نتا</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یج به</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دست</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">آمده،</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">نوع</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">تراکم</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">شبکه‌بند</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی تأثیر چندانی روی مدل</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ساز</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی عمق جریان نداشته است. با این </span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">حال</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">و</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">یژگی</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی شبکه مورد استفاده تأثیر بالایی بر توزیع سرعت دارا بوده، به</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">گونه</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ا</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی که شبکه منظم با تراکم بالا بهترین دقت را در شبیه</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ساز</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی سرعت جریان داشته است. تحلیل</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ها</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی آماری صورت گرفته نشان</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دهنده</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">دقت</span></span></strong> <strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">بالا</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی مدل است به</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">گونه</span></span></strong><strong><span style="font-family:sakkal majalla;"><span style="font-size:11.0pt;">‌</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ا</span></span></strong><strong><span style="font-family:b lotus;"><span style="font-size:11.0pt;">ی که جذر میانگین مربعات خطا برای دبی جریان و سطح آب به‌ترتیب 17/95 متر‌مکعب بر ثانیه و ۰/50 متر محاسبه شده است. علاوه بر این ضریب ناش- ساتکلیف نیز برای دبی جریان و سطح آب بالای 0/9 براورد شد که مقدار مطلوبی به‌حساب می‌آید.</span></span></strong><strong><span style="letter-spacing:-.3pt;"><span style="font-family:b lotus;"></span></span></strong></div> <div style="text-align: justify;">Hydrodynamic models proposed for simulating flow hydraulic in rivers assume the flow in one direction and simulate the hydraulic parameters based on the one-dimensional Saint-Venant equations. In this research, a two-dimensional HEC-RAS model was used to simulate the flow in the Karun River, between Mollasani and Farsiat stations. Geographic information system (GIS) and river cross sections were used to prepare the altitude map using the satellite image of the study area. Modeling results in river bends showed that the maximum velocity occurred in the outer bend, which coincided with the flow mechanism in the bends. Based on the results, grid type and density have little effect on flow depth modeling. However, the characteristics of the mesh used had a great influence on the velocity distribution, so that the regular high-density mesh had the best accuracy in simulating the flow velocity. Statistical analysis showed that the RMSE for the flow discharge and flow depth were 17.95 m³/s and 0.05 m, respectively. In addition, the Nash&ndash;Sutcliffe efficiency index was calculated to be above 0.9 for the discharge and flow depth, which could be considered as a desirable value.</div> مدل HEC- RAS, سیستم اطلاعات جغرافیایی (GIS), شبکه‌بندی, قوس رودخانه HEC-RAS model, GIS, Mesh grid, River bend 331 344 http://jstnar.iut.ac.ir/browse.php?a_code=A-10-3615-1&slc_lang=fa&sid=1 J. Zahiri جواد ظهیری zahiri1983@gmail.com Yes 1. Department of Water Engineering, Agricultural Sciences and Natural Resources University of Khuzestan, Iran. 1. گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان M. Ashnavar مهران آشناور ashna.mehran@gmail.com No 1. Department of Water Engineering, Agricultural Sciences and Natural Resources University of Khuzestan, Iran. 1. گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی خوزستان