تخمین ابعاد جبهه رطوبتی در آبیاری قطره‌ای با کاربرد توامان قضیه π ‌باکینگهام و نرم-افزار HYDRUS-2D در خاک‌هایی با بافت متفاوت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری/ دانشگاه ارومیه

2 هیات علمی/ دانشگاه ارومیه

چکیده

طراحی و مدیریت دقیق سیستم‌های آبیاری قطره‌ای، مستلزم داشتن اطلاعات مناسب از ابعاد جبهه رطوبتی (قطر و عمق خاک خیس شده توسط قطره‌چکان‌ها) در بافت‌های مختلف خاک است. پارامترهای مهمی همچون ویژگی‌های هیدرولیکی خاک، دبی خروجی قطره‌چکان و زمان آبیاری بر ابعاد پیاز رطوبتی تاثیر می‌گذارند. در این پژوهش، مدل‌های نیمه‌تجربی جدید برای تخمین عمق و حداکثر قطر جبهه رطوبتی خاک تحت منبع نقطه‌ای در خاک‌هایی با بافت‌های گوناگون توسعه یافت. بدین‌منظور، نرم‌افزار HYDRUS-2D برای دبی کاربردی (3 لیتر بر ساعت) در کلاس‌های مختلف بافت خاک اجرا شد. با کاربرد قضیه π باکینگهام به-همراه مقادیر حاصل از اجرای نرم‌افزار که شامل عمق و حداکثر قطر جبهه رطوبتی بود، معادلات تعیین ابعاد جبهه رطوبتی برای بافت‌های مختلف ارائه گردید. معادلات توسعه یافته شامل پارامترهای هدایت هیدرولیکی اشباع خاک، مدت زمان کارکرد و دبی قطره‌چکان بودند. نتایج شاخص‌های آماری برای همه معادلات (حداقل مقدار ضریب همبستگی (R) 968/0، حداکثر مقدار جذر میانگین مربعات خطای (RMSE) 120/2 سانتی‌متر و حداکثر مقدار میانگین خطای مطلق (MAE) 376/1 سانتی‌متر) نشان-دهنده قابلیت معادلات ارائه شده در برآورد ابعاد پیاز رطوبتی در خاک‌هایی با بافت مختلف می‌باشد. معادلات ارائه شده می‌تواند به‌صورت موثر در طراحی و مدیریت بهینه سیستم آبیاری قطره‌ای در خاک‌هایی با بافت متفاوت استفاده گردد.

کلیدواژه‌ها


عنوان مقاله [English]

Wetting Pattern Dimensions Determination in Drip Irrigation by Coupling the HYDRUS-2D Software and Backingham π Theorem in Texturally Different Soils

نویسنده [English]

  • Sina Besharat 2
چکیده [English]

For design and accurate management of drip irrigation systems, it is necessary to have sufficient information regarding the dimensions of wetting front (diameter and depth of the soil wetted by drippers) for various soil textures. Such important parameters as soil hydraulic functions, drip discharge and irrigation time influence the dimensions of created wetting front. In this study, new semi-empirical models for determination of depth and maximum diameter of soil wetting front under point source in several soil textures were developed. For this purpose, HYDRUS-2D software was run for an application discharge (3 L/hr) in several soil textures. Using Backingham π theorem and obtained values from software, including depth and maximum diameter of soil wetting front, the equations which estimate the wetting front dimensions were presented for several soil textures. Soil saturated hydraulic conductivity, irrigation time and dripper discharge were the parameters of developed equations. Statistic indices results for all equations (min Correlation Coefficient about 0.968, max Root Mean Square Error about 2.120 and max Mean Absolute Error about 1.376) firm the ability of presented equations in calculation of wetting pattern dimension in different soil structures. On the basis of obtained results, presented equations can be used properly for designing and optimal management of drip irrigation system which is located in any soil textures.

کلیدواژه‌ها [English]

  • Drip irrigation
  • Backingham π theorem
  • HYDRUS-2D software
  • Wetting Pattern
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