دوره 11، شماره 22 - ( پاییز و زمستان 1399 )                   جلد 11 شماره 22 صفحات 243-253 | برگشت به فهرست نسخه ها

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Mohammadamini H, Khaledi darvishan A, Alavi J. Effects of Soil Surface Rock Fragments on Runoff Variables of Field Plots under Rainfall Simulation. jwmr. 2020; 11 (22) :243-253
URL: http://jwmr.sanru.ac.ir/article-1-942-fa.html
محمدامینی هیرو، خالدی درویشان عبدالواحد، علوی جلیل. اثر پوشش سنگ و سنگ‎ریزه سطحی خاک بر متغیرهای رواناب در کرت‌های صحرایی تحت شبیه‌سازی باران. پ‍‍ژوهشنامه مديريت حوزه آبخيز. 1399; 11 (22) :243-253

URL: http://jwmr.sanru.ac.ir/article-1-942-fa.html


گروه مهندسی آبخیزداری، دانشکده منابع طبیعی، دانشگاه تربیت مدرس، نور، ایران
چکیده:   (330 مشاهده)
    سنگ و سنگ‌ریزه سطحی خاک بهعنوان عاملی مهم در رواناب و فرسایش قلمداد میشود. با وجود این، پژوهش‌های محدودی در خصوص بررسی کمّی اثر سنگ و سنگ‌ریزه سطحی خاک بر مؤلفه‌های رواناب به‌عنوان یکی از اجزای جدایی‌ناپذیر فرآیند فرسایش و بهویژه در شرایط طبیعی خاک انجام شده است. لذا پژوهش حاضر درصدد بررسی اثر درصد پوشش سنگ و سنگ‌ریزه سطحی بر مؤلفه‌های رواناب در کرت طبیعی و تحت شبیه‌سازی باران در خاک با بافت رسی-لومی و عمق عموماً کم‌تر از یک متر و با شیب طبیعی 20 درصد بوده است. مقادیر مؤلفه‌های رواناب شامل زمان شروع، حجم، ضریب و زمان خاتمه رواناب در کرت‌های صحرایی 1×1 متر مربع با 6 سطح پوشش سنگ و سنگ‌ریزه سطحی (2±2، 2±10، 2±18، 2±26، 2±34 و 2±42 درصد پوشش سطح خاک) و هر کدام با 3 تکرار تحت بارندگی با شدت ثابت 40 میلی‌متر بر ساعت اندازه‌گیری شد. نتایج نشان داد که افزایش پوشش قطعات سنگی سطحی تا حد مشخصی (حدود 34 درصد) باعث افزایش نفوذ، تاخیر در تشکیل رواناب سطحی، کاهش حجم و ضریب رواناب و تسریع در زمان خاتمه رواناب شده‌است. روند تغییرات مؤلفه‌های رواناب در دامنه پوشش قطعات سنگی سطحی خاک از حدود 34 تا 42 درصد معکوس شده است.
متن کامل [PDF 1327 kb]   (101 دریافت)    
نوع مطالعه: پژوهشي | موضوع مقاله: فرسايش خاک و توليد رسوب
دریافت: 1397/3/7 | ویرایش نهایی: 1399/12/13 | پذیرش: 1399/3/21 | انتشار: 1399/12/13

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