مقایسه عملکرد مدل‌های هیدرولیکی مختلف و ارائه مدل ترکیبی BMA به‌منظور شبیه‌سازی حرکت آب در خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری دانشگاه ارومیه

2 استادیار گروه آبیاری و زهکشی، دانشگاه ارومیه

3 دانشجوی دکتری آبیاری و زهکشی، دانشگاه ارومیه

چکیده

تاکنون مدل­های هیدرولیکی مختلفی برای تعیین هدایت هیدرولیکی غیر­اشباع در خاک ارائه شده است، اما در تحقیقات اندکی توانایی این مدل­ها در شبیه­سازی نحوه حرکت آب در خاک ارزیابی شده است. لذا در مطالعه حاضر، عملکرد 5 مدل هیدرولیکی مختلف ارائه شده در مدل HYDRUS-2D ، از جمله مدل­های ون­گنوختن-معلم، ون­گنوختن اصلاح شده، کوسوگی، بروکس-کوری و دورنر در شبیه­سازی پروفیل رطوبتی آبیاری قطره­ای سطحی مورد ارزیابی قرار گرفت. علاوه بر این به منظور بهبود نتایج بدست آمده، یک مدل ترکیبی با استفاده از روشمیانگین­گیری بیزی (BMA) بر مبنای وزن­دهی به عملکرد مدل­های هیدرولیکی مذکور ارائه شده است. به منظور بررسی عملکرد مدل­های مختلف، آزمایشی با روش آبیاری قطره­ای T-Tape در مزرعه­ای با خاک لوم رسی انجام گرفت. مقایسه نتایج مقادیر شبیه­سازی با مقادیر اندازه­گیری شده رطوبت حجمی خاک در زمان­های آبیاری 8 و 24 ساعت و با استفاده از پارامتر­های مجذور میانگین مربعات خطا و ریشه میانگین مربعات خطای نرمال­شده انجام گرفت. براساس نتایج بدست آمده، ریشه میانگین مربعات خطای نرمال شده­ی پیش­بینی رطوبت حجمی خاک برای زمان­های 8 و 24 ساعت به ترتیب در محدوده 20 تا 29 و 26 تا 39 درصد و مجذور میانگین مربعات خطا برای زمان­های 8 و 24 ساعت به ترتیب در محدوده 04/0 تا 06/0 و 05/0 تا 09/0 (cm3cm-3) بدست آمد. مقدار متوسط ضریب تعیین برای زمان­های 8 و 24 ساعت به ترتیب، 93/0 و 89/0 بدست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Comparing the performance of different hydraulic models and provide a BMA model to simulate water movement in soil

نویسندگان [English]

  • Farid Feizollah poor 1
  • Sina Besharat 2
  • afshin khorsand 3
1 Urmia University
2 Urmia University
3 Urmia University
چکیده [English]

There are several different hydraulic models to estimate unsaturated conductivity, but a few researches have evaluated the ability of these models for simulation of water movement in porous media. In this study, we evaluated the performance of 5 different hydraulic models, which used in HYDRUS-2D model (van Genuchten-Mualem, modified van Genuchten, Brooks and Corey, Kosugi and Durner) in simulation of water content profile in surface drip irrigation. Moreover, in order to improve results, a combinational averaging model using BMA method, based on weighting to the hydraulic models performance is presented. In this study, a sandy-loam soil was irrigated using T-Tape drip tubing. Two drip irrigation trials (8 and 24 hour) were carried out. Evaluation of simulated and measured soil water content was performed by using adjusted coefficient of correlation, RMSE and normalized root mean square errors (NRMSE). Based on the results, the NRMSE in soil water content prediction for 8 and 24 (hour) times was calculated in the range of 20 to 29 and 26 to 39 percent, respectively. In addition, the RMSE for 8 and 24 (hour) times was calculated in the range of 0.04 to 0.06 and 0.05 to 0.09 (cm3cm-3), respectively. The average regression coefficient for 8 and 24 (hour) times was calculated 0.93 and 0.89, respectively.

کلیدواژه‌ها [English]

  • Beyesian Model Averaging
  • HYDRUS Model
  • Soil Hydraulic Properties
  • Surface drip irrigation
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