بررسی تاثیر سازه پل در مسیر رودخانه بر رفتار هیدرولیکی جریان (مطالعه موردی: رودخانه ولیان)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه آزاد واحد علوم و تحقیقات تهران

2 دانشگاه تهران

‎10.22052/deej.2022.113660

چکیده

وجود سازه­ها در مسیر رودخانه مانند پل، بند، اعیانی ها و غیره باعث تغییر خصوصیات هیدرولیکی جریان رودخانه شده و تغییر در این خصوصیات جریان ممکن است بستر رودخانه را تغییر دهد. در پژوهش حاضر، اجرای مدل هیدرولیکی رودخانه ولیان و نتایج حاصل از آن و نقش پل­ها ( چندار، اسکول دره، آجین دوجین و ولیان) در شرایط طبیعی بستر مورد بررسی قرار گرفته است. با در اختیار داشتن نقشه­های توپوگرافی با دقت مناسب (مقیاس 1:500) و نرم افزارهای GIS شامل ARCGIS-GEORAS و امکان ساخت مدل GIS از این محدوده مطالعاتی، از مدل ریاضی  HEC-RAS استفاده گردید. رودخانه مورد مطالعه در شرایط طبیعی و در وضعیت موجود ( وجود سازه­ها)، برای سیلاب­های با دوره بازگشت های مختلف 2، 2.33، 5، 10، 25، 50، 100، 200، 500 و 1000 مدل گردید. نتایج نشان داد که وجود پل­ها  بیشترین تاثیر روی مساحت مقطع عبوری جریان ( 11.6%) و عرض سطح آزاد آب( 16.5%) و کمترین تاثیر روی سطح ارتفاع آب و تراز گرادیان انرژی ( حدود صفر درصد )دارند.  عدد فرود و سرعت جریان در تمام پل­ها به جز پل ولیان کاهش داشته است. ارتفاع گرادیان انرژی متغییر بوده است. کمترین تغییرات مربوط به سطح ارتفاع آب، گرادیان انرژی و بیشترین اختلاف مربوط به پارامتر عرض سطح آب و مساحت می­باشد.  با توجه به نتایج حاصل از خصوصیات هیدرولیکی با دوره بازگشت 25 ساله جهت اتخاذ تصمیمات مدیریتی لازم، پیشنهاد گردید پل اسکول دره به دلیل بیشترین تغییرات در سطح مقطع جریان و عرض سطح آب در اولویت اول و پل ولیان در اولویت آخر مدیریتی قرارگیرند.

 

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of the Impact of Bridge Structures on the River Route on the Hydraulic Behavior of the Flow (Case study: Velian River)

نویسندگان [English]

  • shabnam vakili 1
  • Alireza Moghaddamnia 2
1
2
چکیده [English]

Existence of constructions in the river route such as bridges, levee, nobles, etc. has changed the hydraulic behavior of the river flow and a change in this behavior may change the riverbed. In this research, the implementation of hydraulic model of Velian river and its results and the role of bridges (Chandar, Eskol Darreh, Ajin Dojin and Velian) in natural bed conditions have been investigated. For this purpose, HEC-RAS model has been used. The studied river was modeled in natural conditions and in the current situation for floods with different return periods of 2, 2.33, 5, 10, 25, 50, 100, 200, 500 and 1000. The results showed that the presence of bridges has the greatest impact on the flow cross-sectional area (11.6%) and the width of the free water surface (16.5%) and the least impact on the water level and energy gradient level (about zero percent). The froud number and flow velocities have decreased on all bridges except Valian Bridge. The height of the energy gradient has been variable. The least changes are related to water level, energy gradient and the most differences are related to water level width and area. According to the results obtained with a 25-year return period to make the necessary management decisions, it was suggested that School Darreh bridge be the first priority and Velian bridge be the last management priority due to the most changes in flow cross section and water level width.

کلیدواژه‌ها [English]

  • Hydraulic model of river
  • Return period
  • width of free water surface

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مهندسی اکوسیستم بیابان
دوره 11، شماره 35
شهریور 1401
صفحه 59-72

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