برآورد و تحلیل ویژگی های هیدرولیکی خاک از طریق آزمایش نفوذ بیرکن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مربی گروه مهندسی آب دانشگاه گیلان

2 استادیار گروه مهندسی آب دانشگاه گیلان

3 دانشیار گروه خاک شناسی دانشگاه گیلان

4 کارشناس ارشد گروه خاک‌شناسی دانشگاه گیلان

چکیده

مطالعة انتقال آب و آلاینده‏ها در محیط غیر اشباع خاک مستلزم تعیین ویژگی‏های هیدرولیکی خاک است. در این تحقیق، برآورد پارامترهای هیدرولیکی خاک از آزمایش نفوذ کم‌هزینة بیرکن در شش نقطة منطقة اسالم گیلان با شش کلاس بافت مختلف بررسی شد. پارامترهای شکل و اندازة منحنی‏های مشخصة هیدرولیکی به ترتیب از تحلیل توزیع اندازة ذرات خاک و مدل‏سازی آزمایش نفوذ با روش‏های BEST-slope(B/s)، BEST-intercept (B/i)، خطی‏سازی مشتقی (DL) و خطی‏سازی تجمعی (CL) تعیین شد. تجزیه‌وتحلیل نتایج نشان داد با وجود اجرای راحت‏تر دو روش DL و CL در مقایسه با روش‏های ‏B/s و B/i، این دو روش در تخمین مقادیر معتبر پارامترهای اندازه در هیچ‌یک از نقاط آزمایش موفق نبودند. این در حالی است که دو روش B/s و B/i به صورت مکمل یکدیگر عمل کردند و توانستند با دقت این پارامترها را در همة نقاط برآورد کنند. مقادیر پارامتر قابلیت جذب آب تخمینی به دو روش B/s و B/i اختلاف معنا‏داری نداشت. اما مقدار هدایت هیدرولیکی اشباع به روش B/i بیشتر از روش B/s تخمین زده شد. با توجه به خطای نسبی کمتر روش B/s، به نظر می‏رسد برآوردهای روش B/i تا حدودی دست‌بالا باشد. بنابراین، در شرایط مدل‏سازی موفق و معتبر با هر دو روش، بهتر است مقادیر تخمینی پارامترها به روش B/s مد نظر قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimation and Analysis of Soil Hydraulic Properties Using Beerkan Infiltration Experiment

نویسندگان [English]

  • Sayed Ali Moussavi 1
  • Mohammad Reza Khaledian 2
  • Hossein Asadi 3
  • Mohammad Aligoli 4
  • Mahdi Norouzi 4
1 Lecturer, Department of Water Engineering, University of Guilan, Iran
2 Assistant Profeser, Department of Water Engineering, University of Guilan, Iran
3 Associate Profeser, Department of Soil Sciences, University of Guilan, Iran
4 Former MSc Student, Department of Soil Sciences, University of Guilan, Iran
چکیده [English]

A Study of water and contaminants transport in the vadose zone demands for a
determination of soil hydraulic properties. The current study aimed at estimating and
analysing the soil hydraulic parameters through an inexpensive experiment of Beerkan
within six sample points of various soil textural classes, in Asalem region, Guilan (Iran).
Shape and scale parameters of the hydraulic characteristic curves were estimated from
particle size distribution analysis and infiltration experiment respectively. Four fitting
methods were employed and copmaired including BEST-slope (B/s), BEST-intercept
(B/i), Derivative Linearization (DL) and Cumulative Linearization (CL). Although scale
parameters were estimated through DL and CL methods easier than through B/s and B/i
methods, but the estimated values did not come out to be valid in any of the experimental
point. On the other hand, B/s and B/i methods acted as complementary to each other and
estimated accurate values for scale parameters of all the six experimental points. The
estimated values of sorptivity through B/s and B/i method were not significantly
different, but saturated hydraulic conductivity values estimated through B/i exceeded the
B/s values. Also a comparison of these two methods through relative error showed that
B/s is more accurate than B/i. It seems that B/i method leads to an overestimation of the
saturated hydraulic conductivity. It is recommended therefore to make use of B/s method
for estimating soil hydraulic properties.

کلیدواژه‌ها [English]

  • Infiltration
  • Beerkan method
  • Shape and scale parameters
  • Saturated hydraulic conductivity
  • sorptivity

مراجع

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