مقایسه الگوریتم‌های مختلف تحلیل آزمایش نفوذ بیرکن در منطقه سیستان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری آبیاری و زهکشی گروه مهندسی آب دانشگاه زابل، زابل، ایران

2 دانشیار گروه مهندسی آب دانشگاه زابل، زابل، ایران

چکیده

در سال­های اخیر روش آزمایش نفوذ تک­استوانه­ای بیرکن به­دلیل کم­هزینه بودن و سادگی در اجرا بسیار مورد توجه قرار گرفته است. الگوریتم­های BESTslope، BESTintercept و BESTsteady الگوریتم­هایی هستند که از طریق داده­های آزمایش نفوذ بیرکن، خصوصیات هیدرولیکی خاک مانند هدایت هیدرولیکی اشباع (Ks) و توانایی جذب خاک (S) را تخمین می­زنند. هدف از پژوهش حاضر مقایسه سه الگوریتم مذکور در تخمین خصوصیات هیدرولیکی خاک و تخمین منحنی مشخصه و منحنی هدایت هیدرولیکی خاک است. برای این منظور تعداد 40 آزمایش نفوذ بیرکن در مزرعه تحقیقاتی سد سیستان انجام شد. مقادیر منفی و مثبت با خطای نسبی (Er) بیش­تر از 5/5 درصد از مجموع کل نتایج حذف شد و در نهایت تعداد 31 آزمایش در بافت­های لومی و لوم ماسه­ای انتخاب گردید .نتایج نشان داد که الگوریتم BESTsteady فرآیند محاسباتی بسیار ساده­تری نسبت به دو الگوریتم دیگر دارد. از طرفی مقدار Ks، S و منحنی مشخصه و هدایت هیدرولیکی تخمین زده شده با این الگوریتم با دقت بسیار خوبی مشابه نتایج به‌دست آمده از الگوریتم BESTslope (الگوریتم اصلی) بود. بنابراین می­توان نتیجه گرفت که الگوریتم BESTsteady در خاک­های لومی و لوم ماسه‌ای می­تواند به­عنوان یک الگوریتم کاربردی، جایگزین بسیار مناسبی برای دو الگوریتم دیگر و به­خصوص الگوریتم اصلی باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of Different Algorithms for Analyzing the Beerkan Infiltration Experiment in Sistan Region

نویسندگان [English]

  • Tarokh Ahmady 1
  • Peyman Afrasiab 2
1 ph.D Student in Irrigation and Drainage, Faculty of Water and Soil, University of Zabol ., Zabol., Iran
2 Associate Professor, Water Engineering Department, Faculty of Water and Soil, University of Zabol., Zabol., Iran
چکیده [English]

In recent years, the single ring Beerkan infiltration experiment has gained increasing attention as it is cheap and simple to implement. The BESTslope, BESTintercept and BESTsteady algorithms were developed to estimate the soil hydraulic properties (e.g. saturated hydraulic conductivity (Ks) and sorptivity (S)) through the Beerkan infiltration experiment. The purpose of this study is to compare these algorithms for estimating hydraulic properties, retention curve and hydraulic conductivity curve. For this purpose, 40 Beerkan infiltration tests were carried out in an experiment field in Sistan dam region. The negative and positive values with a relative error (Er) of more than 5.5% were eliminated and a set of 31 experiments in soils with loam and sandy loam textural classes was selected for the rest of analysis. The results showed that the BEST steady algorithm has the simplest calculating process and the Ks and S values as well as water retention and hydraulic conductivity curves estimated by this algorithm were similar to those obtained by the original algorithm with an acceptable accuracy. Therefore, it could be concluded that in soils with loam and sandy loam textures, the BEST steady algorithm is an appropriate alternative, which could be applied instead of two other algorithms.

کلیدواژه‌ها [English]

  • Relative error
  • Retention curve
  • Saturated hydraulic conductivity
  • Sorptivity
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