تخمین سطح ویژه خاک به کمک توابع انتقالی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 شرکت آب منطقه‌ای کرمانشاه

2 استاد دانشکده مهندسی علوم آب -دانشگاه شهید چمران اهواز

3 پژوهشکده حفاظت خاک و آبخیزدازی ایران

چکیده

سطح ویژه (SSA)در تعامل یون‌ها و مولکول‌های آب با ذرات خاک حائز اهمیت است؛ این مؤلفه برای توصیف پدیده­هایی مانند ظرفیت نگهداری آب، جذب سموم و آلاینده­ها، انتقال آلودگی، هدایت هیدرولیکی و ... به کار می­رود. بنابراین سطح ویژه به عنوان نمایه­ای از رفتار خاک تلقی می­شود. اندازه­گیری این مؤلفه وقت­گیر و هزینه بر بوده و تخمین آن توسط متغیرهای که به سهولت در خاک اندازه­گیری می­شود ارجحیت دارد. هدف این تحقیق ارائه توابع انتقالی جهت برآورد SSA انواع خاک با بافت سبک و سنگین و فاقد کانی­های تورم­پذیر رسی به کمک درصد ذرات تشکیل دهنده می­باشد. در این راستا دو رابطه انتقالی ارائه شد؛ رابطه اول به صورت تابعی غیر خطی از درصد رس و انحراف استاندارد هندسی قطر ذرات (gσ) و رابطه دوم تابعی نمایی از شیب خط رگرسیونی منحنی لگاریتم طبیعی دانه­بندی می­باشد. صحت­سنجی روابط به دست آمده نشان داد هر دو تابع انتقالی با دقت تقریباً مساوی سطح مخصوص را دقیق‌تر از توابع ارائه شده توسطSepaskhah  و همکاران (2010) و Sepaskhah و Tafteh (2013) تخمین می­زند.

کلیدواژه‌ها

عنوان مقاله [English]

Estimation of Specific Surface Area of Soils Using Pedotransfer Functions

نویسندگان [English]

  • Mohammad Tajbakhsh 1
  • Manoochehr Fathi Moghadam 2
  • Nader Ebrahimi 3
1 Water Resource Authority, Kermanshah, Iran
2 School of Hydraulic Structures, Shahid Chamran University, Ahvaz, Iran
3 Soil Conservation and Watershed Management Institute, Tehran, Iran
چکیده [English]

The term “Specific Surface Area” (SSA) refers to the area per unit weight of soil. SSA is a fundamental soil property that can be used as an indicator of soil behavior (Utkaeva, 2007) to explain many of the physical and chemical phenomena of the soil: including fertility-determining components (such as the water holding capacity, the adsorption of plant nutrients, and the amount of organic matter) (Voronin, 1975). Measurement of specific surface area is time-consuming and relatively expensive; therefore, its estimation by routinely measured soil variables is preferred. In the present paper two pedotransfer functions for estimating of total SSA (including external and internal specific surface area) was presented, one a multivariate pedotransfer function based on the standard deviation of the diameter of soil particles and clay percent and second an exponential pedotransfer function based on slope of linear regression equation of logarithmic PSD Curve.   

کلیدواژه‌ها [English]

  • Pedotransfer function
  • PSD curve
  • Slope of linear regression
  • Specific surface area

مراجع

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