مدیریت رطوبت با مدل HYDRUS 2D/3D برای تعیین عمق و فاصله زهکش‌ها در کشت دوم شالیزار

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه مهندسی آب، دانشگاه علوم کشاورزی و منابع طبیعی ساری،

2 مهندسی آب دانشگاه علوم کشاورزی ساری

3 دانشیار، دانشگاه شهرکرد، تخصص: مدل‌سازی گیاهی و تنش‌های آبی مباحث نوین در زهکشی

چکیده

تخلیه آب اضافی ناحیه ریشه از اهداف اجرای سیستم‌های زهکشی است. در این پژوهش مدل HYDRUS 2D/3D برای مدیریت انتقال رطوبت در تعیین عمق و فاصله زهکش ها برای کشت دوم اراضی شالیزاری دانشگاه علوم کشاورزی و منابع طبیعی ساری در سه سال زراعی (1396-1393 ) مورد ارزیابی قرار گرفت. مزرعه الف دارای دو زهکش با عمق 90 سانتی متر و فاصله 30 متری و مزرعه ب دارای زهکش هایی در عمق های 90، 65، 90 سانتی متری با فاصله 15 متری بود. مدل نسبت به پارامتر تجربی خاک آنالیز حساسیت شد. نتایج نشان داد که مدل HYDRUS نسبت به رطوبت حجمی اشباع دارای حساسیت زیاد می باشد. سناریوهایی شامل: اعمال زهکش میانی در 1- عمق 40، 2- عمق 90، 3- دو زهکش میانی در عمق 40 و 4- دو زهکش میانی در عمق 65 سانتی متری برای مزرعه الف تعریف شد. بیشترین کاهش رطوبت در سناریوی چهار 75/18 درصد و کمترین 22/0 درصد در سناریوی یک رخ داد. سناریوی سه، دو روز و سناریوی چهار، چهار روز نسبت به مزرعه ب رطوبت لایه اول را زودتر تخلیه و به ظرفیت زراعی رساند. سناریوی چهار بهترین و سناریوی یک ضعیف‌ترین نتایج را نشان داد.

کلیدواژه‌ها

عنوان مقاله [English]

Soil moisture management for determination of depth and space of drainages insecond cropping of paddy by using HYDRUS 2D/3D Model

نویسندگان [English]

  • PEYMAN MOKHTARI MOTLAGH 1
  • Ali Shahnazari 2
  • Mohammad reza Nouri emamzadei 3
1 Ph.D. Student, Department of Water Engineering, Sari Agricultural Sciences and Natural Resources University, Sari - Iran
2 Sanru
3 Associate Professor, Department of Water Engineering, Shahrekord University, Shahrekord - Iran
چکیده [English]

Depletion of excess soil moisture from root zone is one of the objectives of the implementation of drainage systems. In this study the ability of HYDRUS 2D/3D model to soil moisture transport management for determining of depth and space of drains in second cropping of paddy fields of Sari Agricultural Sciences and Natural Resources University in For the three growing season (2014-2017) is assessed. So, two kinds of fields were constructed: Field A with subsurface drainage systems and drain depth of 0.9 m and drain spacing of 30 m and field B having drain spacing of 15 m and alternate drain depths of 90, 65 and 90 cm. Sensitivity analysis and calibration were first performed with the aim of verifying the HYDRUS model. The sensitivity analysis indicated that the software had maximum sensitivity to the saturated volumetric water content. Four scenarios were considered for field A in HYDRUS model which consist of: middle drain in 1- the depth of 40, 2- in the depth of 90, 3- two middle drains in the drain of 40 and 4- two middle drains of 65 cm. Scenario 4, 3, 2 in field B and scenario 1 showed the maximum of soil moisture depletion respectively. The maximum loss of soil moisture was observed in scenario 4 by 18.75 percent and minimum loss of soil moisture was occurred in scenario 1 by 0.22 percent. Also, evaluation of results showed that scenario 3 and scenario 4 depleted the soil moisture during the period of 2-days and 4-days, respectively earlier in respect to of first level of soil and reached to field capacity. Also, results showed that scenario 4 is the best in contrast to scenario 1 which has the worst.

کلیدواژه‌ها [English]

  • Field Capacity
  • Plough layer
  • Scenario
  • Water Level

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نشریه آبیاری و زهکشی ایران
دوره 13، شماره 4 - شماره پیاپی 76
مهر و آبان 1398
صفحه 959-972

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