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مقایسه عملکرد مدلهای هیدرولیکی مختلف و ارائه مدل ترکیبی BMA به‌منظور شبیهسازی حرکت آب در خاک | ||
| تحقیقات آب و خاک ایران | ||
| مقاله 2، دوره 49، شماره 1، فروردین و اردیبهشت 1397، صفحه 13-24 اصل مقاله (1.47 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijswr.2018.133364.667312 | ||
| نویسندگان | ||
| فرید فیض اله پور* 1؛ سینا بشارت2؛ افشین خورسند3 | ||
| 1دانشجوی دکتری دانشگاه ارومیه | ||
| 2استادیار گروه آبیاری و زهکشی، دانشگاه ارومیه | ||
| 3دانشجوی 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 | ||
| آبیاری قطره ای سطحی؛ پارامترهای هیدرولیکی خاک؛ مدل هایدروس؛ مدل میانگین گیری بیزی | ||
| 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 poor1؛ Sina Besharat2؛ afshin khorsand3 | ||
| 1Urmia University | ||
| 2Urmia University | ||
| 3Urmia 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 | ||
| مراجع | ||
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