بررسی رفتار هیدرولیکی و شیمیایی پوشش‌ زهکشی مرکب ژئوتکستایل و پوسته برنج در دو کیفیت آبی متفاوت

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 استادیار گروه مهندسی آب دانشکدة علوم کشاورزی دانشگاه گیلان

چکیده

پوشش دور زهکشی، با هدف کاهش ورود ذرات خاک به درون زهکش و همچنین افزایش هدایت هیدرولیکی اطراف آن، نقشی مهم در عملکرد زهکش زیرزمینی دارد. در این پژوهش، اثر پوشش‌های مرکب، شامل مواد مصنوعی و آلی، به‌منزلة تقویت‌کنندة شیب هیدرولیکی و زیست جاذب بر روند تغییرات هیدرولیکی و شیمیایی زهاب خروجی از شرایط اراضی شالیزاری فاقد گیاه بررسی شد. برای این منظور، لولة زهکشی دارای پوشش مصنوعی در دو اندازة نازک و ضخیم در عمق 40 سانتی‌متری درون مدل فیزیکی نصب و سپس به ضخامت 5 سانتی‌متر با پوستة برنج دور آن پر شد. آزمایش تحت جریان 1000 ساعت و دو شوری آب 7/0 و 9/1 دسی‌زیمنس بر متر انجام گرفت و پارامترهای دبی، شوری، نسبت جذب سدیم، و اسیدیتة زهاب خروجی از زهکش بررسی شد. نتایج نشان داد کاهش دبی زهاب نسبت به شروع آزمایش در تیمارهای پوستة برنج با ژئوتکستایل نازک در کیفیت آب شور (RNS)، پوستة برنج با ژئوتکستایل نازک در کیفیت آب معمولی (RN)، پوستة برنج با ژئوتکستایل ضخیم در کیفیت آب معمولی (RV)، و پوستة برنج با ژئوتکستایل نازک در کیفیت آب شور (RVS) به ترتیب 44، 94، 21، و 75 درصد است. تیمارهای RNS و RN به ترتیب بیشترین و کمترین گرفتگی را داشتند. ضخامت ژئوتکستایل در میزان کمّی و کیفی زهاب خروجی مؤثر بود و پوستة برنج برای تیمارهای شور عملکرد مناسبی نداشت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of Hydraulical and Chemical Behavior of Dual Drain Envelopes (Organic and Synthetic) in Paddy Conditions with Two Different Water Qualities

نویسندگان [English]

  • Ehsan Ghane 1
  • Maryam Navabian 2
  • Mehdi Esmaeili Varaki 2
  • Amir Malekpor Estalki 2
1 MSC Student, Water Engineering Department, Agricultural Sciences Faculty, University of Guilan
2 Assistant Professor, Water Engineering Department, Agricultural Sciences Faculty, University of Guilan
چکیده [English]

Drain envelopes play significant roles in the performance of drainage systems due to their
reduction in letting sediments into the drainpipes and also because of an increase in the
hydraulic conductivity of soil around the drainpipes. Throughout the present research, the
effect of a one 1000 hour flow on dual envelopes consisting of geotextile as a means of
improving the hydraulic gradient and rice husk as bio-sorbent, on the hydraulic and
chemical trends under paddy field conditions, with no rice crop, was considered. Towards
this end, a drainpipe covered with two different thicknesses of geotextile at a depth of 40
cm was installed on a physical model. Then the drain pipe was filled, using a 5 cm
thickness of rice husk. A thousand hour flow test, under two different water qualities of
0.7 and 1.9 dS/m was carried out, and while flow of drainage, EC, sodium absorption
ratio and pH of drained water being assessed. Results showed that the reduction of flow
rate of treatments of rice husk & thin geotextile with saline water (RNs), rice husk & thin
geotextile with water of ordinary quality (RN), rice husk & thick geotextile with ordinary
water quality (RV), as well as rice husk & thick geotextile with saline water (RVs) were
44, 94, 21 and 75 percent, respectively. But, in total, RN and RNs treatments presented
the maximum and minimum cloggings, respectively. Thickness of geotextiles affected the
flow rate and chemical trends, while the performance of rice husk, for all treatments, and
in saline conditions wasn’t appreciable.

کلیدواژه‌ها [English]

  • flow rate
  • Geotextile
  • Rice Husk
  • salinity
  • SAR

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