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اثر توأم تشکیل سله و درز و شکاف سطحی بر هدایت هیدرولیکی اشباع خاک | ||
تحقیقات آب و خاک ایران | ||
مقاله 10، دوره 48، شماره 3، مهر 1396، صفحه 565-572 اصل مقاله (495.38 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22059/ijswr.2017.63426 | ||
نویسندگان | ||
زهرا رمضانی* 1؛ علی رضا واعظی2؛ فاطمه بابایی3 | ||
1مدرس حق التدریس دانشگاه پیام نور قم | ||
2هیت علمی دانشگاه زنجان دانشکده کشاورزی گروه خاکشناسی | ||
3دانشجوی 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 | ||
تراکم درز و شکاف؛ ضخامت سله؛ ضریب انبساطپذیری خطی | ||
مراجع | ||
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