اثر توأم تشکیل سله و درز و شکاف سطحی بر هدایت هیدرولیکی اشباع خاک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مدرس حق التدریس دانشگاه پیام نور قم

2 هیت علمی دانشگاه زنجان دانشکده کشاورزی گروه خاکشناسی

3 دانشجوی دکتری فیزیکو حفاظت خاک دانشکده کشاورزی دانشگاه زنجان

چکیده

سطح اغلب خاک‌های مناطق خشک و نیمه‌خشک دارای سله، درز و شکاف است که تأثیر بسزایی بر هدایت هیدرولیکی خاک ‌دارند. به این منظور در تحقیق حاضر به مطالعه تغییرات زمانی تراکم درز و شکاف، تشکیل سله و تأثیر این پدیده‌ها بر هدایت هیدرولیکی اشباع خاک پرداخته‌ شد. آزمایش در سه خاک با بافت­های (رسی، لومی و لوم‌رس‌شنی) طی چهار تداوم باران (15، 30، 45 و 60 دقیقه) در 8 تکرار طراحی شد. بر اساس نتایج، خاک لوم‌رس‌شنی دارای کم‌ترین مقدار هدایت هیدرولیکی اشباع بود (cm/h 02/21). علت این موضوع ضخامت بیش‌تر سله (mm 16/3) و تراکم کم‌تر درز و شکاف (m/m292/1) در خاک لوم‌‌رس‌شنی نسبت به دو خاک لومی و رسی ارزیابی شد. خاک رسی، به دلیل ضریب انبساط‌پذیری خطی بالاتر دارای بیش‌ترین تراکم درز و شکاف بود. این موضوع سبب افزایش هدایت هیدرولیکی این خاک نسبت به نمونه قبل از بارندگی شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The combined effect of crusting and surface cracking on the of the soil saturated hydraulic conductivity

نویسندگان [English]

  • Zahra ramezani 1
  • AliReza vaezi 2
  • fateme babaei 3
1 Teacher tuition Payam Noor University Qom
2 University of Zanjan
3 University of Zanjan
چکیده [English]

Many soils in arid and semiarid regions have crust and crack that have great effect on soil hydraulic conductivity. For this purpose in this study, to study the changes in the density of seams, formed crust and the impact of this phenomenons on the saturated hydraulic conductivity of soil will be discussed. Experiment was conducted in three soil textures (clay, loam and sandy clay loam) and four continuing (15, 30, 45, 60 minute) rainfall and at 8 reps. Based on results, sandy clay Loam soil was the lowest amount of saturated hydraulic conductivity (21.02 cm/h). Due to this issue was diagnosed higher crust thickness (3.16 mm) and less crack dense (1.92m/m2) in sandy clay loam soil than clay and loam soil. In clay soil, Due to higher linear expansion coefficient of crack density was highest. This issue was cause increased the hydraulic conductivity of this soil than the sample before rainfall.

کلیدواژه‌ها [English]

  • Density crack
  • Thickness crust
  • Linear expansion coefficient
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