کاربرد مدل مفهومی شبه‌سیال در مدلسازی انتقال بار بستر رسوبات در آبراهه‌های حاوی پوشش گیاهی

نوع مقاله : مقاله پژوهشی

نویسنده

استادیار گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه ولی‌عصر (عج) رفسنجان، ایران h.riahi@vru.ac.ir

چکیده

مدلسازی انتقال بار بستر در رودخانه­ها و آبراهه­های حاوی پوشش گیاهی در بستر و سواحل، از اهمیت کاربردی ویژه­ای برخوردار است و پیچیدگی پدیده انتقال باربستر از درون پوشش گیاهی از یک­طرف و محدود بودن تحقیقات در این زمینه از طرف دیگر، ضرورت توسعه مدل­های مناسب را مشهود می­سازد. به همین منظور در این تحقیق از مدل مفهومی شبه­سیال در ترکیب با معادلات تنش برشی و مقاومت بستر جریان از درون پوشش گیاهی استفاده شده است و مبتنی بر تحلیل احتمالاتی انتقال باربستر، مدلی برای انتقال بار بستر درون پوشش گیاهی توسعه مدل یافته است. این مدل براساس تعریف جدیدی از پارامترهای بدون بعد شدت جریان و شدت انتقال بار بستر رسوبات توسعه یافته است که خصوصیات پوشش گیاهی را با خصوصیات جریان و رسوبات ترکیب می­کند. واسنجی توزیع احتمال تخمینی مدل و ضرایب مدل و ارزیابی دقت آن در مقایسه با نتایج داده­های آزمایشگاهی نشان داد مدل توسعه یافته با R2=0.91 و RMSE=8.2 دقت مطلوبی در تخمین باربستر رسوبات در مطالعه موردی دارد. تحلیل پارامتریک مشخصات پوشش گیاهی و همچنین مقایسه نتایج مدل شبه­سیال توسعه یافته با مدل بار بستر پارکر (R2=0.45، RMSE=231.9) و مدل مایر-پیتر-مولر(R2=0.75، RMSE=91.9) نشان داد مدل توسعه یافته دقت بهتری در تخمین باربستر رسوبات از درون پوشش گیاهی دارد و به ترتیب 45 و 68 درصد، خطای مطلق نسبی را نسبت به آنها کاهش داده است. رویکرد توسعه یافته در تحقیق حاضر قابلیت توسعه برای تحلیل هیدرولیکی مسایل مهندسی رسوب در رودخانه را دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Modeling Bed Load Transport through Vegetated Channels Using Conceptual Pseudo Fluid Model

نویسنده [English]

  • Hossien Riahi Madvar
Assistant Professor, Department of Water Engineering, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran,
چکیده [English]

Bed load transport modeling in rivers and channels with vegetation over bed and banks is important. On the other hand, the complexity of bed load transport through vegetation and shortcoming of previous studies, declare the necessity of developing new models. Therefore, in the present study, the pseudo fluid model in combination with bed shear stress and resistance equation was used based on stochastic method of bed load transport. The developed model uses new definitions for dimensionless parameters of flow intensity and bed load rate that include vegetation properties with fluid and sediments. The calibration and verification of model results with experimental results showed that the model with R2=0.91 and RMSE=8.2 have accurate capability in modelling bed load transport through vegetation. The parametric analysis of vegetation features and comparing the results with previous equations showed the reduction of 45 and 68 % in absolute mean error in Mayer-Peter-Muler (R2=0.45,  RMSE=231.9) and Parker (R2=0.75,  RMSE=91.9) models, which indicates the superiority of developed model and the presented framework can be used in hydraulic analysis of sedimentation engineering in rivers.

کلیدواژه‌ها [English]

  • Bed load transport
  • shear stress
  • flow through vegetation
  • Pseudo fluid Model

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تحقیقات آب و خاک ایران
دوره 51، شماره 12
اسفند 1399
صفحه 3059-3070

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