ارزیابی عملکرد زهکش زیرزمینی در مقیاس مدل فیزیکی کشت دوم در اراضی شالیزاری (مطالعه موردی: گیاه تریتیکاله)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد آبیاری و زهکشی گروه مهندسی آب دانشکده علوم کشاورزی دانشگاه گیلان

2 هیات علمی / دانشگاه گیلان- دانشکده علوم کشاورزی گروه مهندسی آب

3 استادیار گروه مهندسی آب دانشکده علوم کشاورزی دانشگاه گیلان

چکیده

به منظور ارزیابی عملکرد زهکش زیرزمینی، پژوهشی در مقیاس مدل فیزیکی در شرایط کشت دوم اراضی شالیزاری انجام شد. در مدل فیزیکی، زهکش‌ها در دو مخزن جداگانه در دو عمق 40 (D40) و 60 (D60) سانتی­متر نصب و گیاه تریتیکاله بعد از برداشت برنج کشت شد. در زمان وقوع بارندگی از زه­آب نمونه تهیه و پارامترهای EC، SAR، pH و TSS در آزمایشگاه اندازه­گیری شد. همچنین سطح ایستابی توسط پیزومتر قرائت شد. نتایج نشان داد که با افزایش عمق نصب زهکش، مقدار EC افزایش و مقدار SAR کاهش یافت. روند تغییرات مقدار EC در طول دوره آزمایش کاهشی بود به طوری که در انتهای دوره EC زه­آب دو زهکش D40 و D60 نسبت به ابتدای دوره به ترتیب 53 و 8 درصد کاهش داشت. مقادیر TSS نشان از عملکرد قابل قبول پوشش ژئوتکستایل در ایفای نقش پوششی خود داشت اما روند نوسانی آن تأثیرگذاری رفتار خاک مورد بررسی بر رفتار پوشش را نشان داد. نتایج نشان داد که زهکش نصب شده در عمق 40 سانتی‌متر در کنترل سطح ایستابی و جلوگیری از وقوع ماندابی موفق‌تر عمل نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluate of subsurface drainage performance at second crop of paddy field (Case study: Triticale in physical model scale)

نویسندگان [English]

  • Seyed Mohammad Rasoul Moazeni 1
  • Maryam Navabian 2
  • Mahdi Esmaeili Varaki 3
1
2
3
چکیده [English]

In order to evaluate the performance of subsurface drainage, a study at physical model scale in condition of second crop paddy fields was done. In the physical model, drains were installed in two depths 40 (D40) and 60 (D60) cm at two separate boxes and triticale was cultivated after rice harvest. In the time of rain, drainage sample parameters include EC, SAR, pH and TSS were measured in the laboratory. The water table was read by piezometer. The results showed that with increase in drainage depth, EC was increase and SAR value declined. Trend of EC was decreasing throughout the experiment, so that EC value at the end of experiment period for two drainages D40 and D60 decreased with a rate of 53% and 8% compared to the start of period. TSS values and trend throughout the experiment demonstrates the use of geotextile at the roles of its cover. It was found that the drainage installed at a depth of 40 cm can be more successful in the control of soil drainage and prevent waterlogging.

کلیدواژه‌ها [English]

  • Environmental effect
  • drainage performance index
  • salinity
  • drainage response factor
  • sodium adsorption ratio
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