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ارزیابی روش برآورد هدررفت خاک با شاخصهای میدانی (مطالعة موردی: حوضة آبخیز شهرک، طالقان) | ||
| نشریه علمی - پژوهشی مرتع و آبخیزداری | ||
| مقاله 11، دوره 68، شماره 3، مهر 1394، صفحه 589-606 اصل مقاله (1.12 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jrwm.2015.56139 | ||
| نویسندگان | ||
| نیره غضنفرپور* 1؛ سادات فیض نیا2؛ حسن احمدی2؛ محمد جعفری2؛ مسعود نصری3 | ||
| 1دکتری دانشکدة منابع طبیعی دانشگاه تهران | ||
| 2استاد گروه احیای مناطق خشک و کوهستانی، دانشکدة منابع طبیعی دانشگاه تهران | ||
| 3استادیار دانشگاه آزاد اسلامی، واحد اردستان | ||
| چکیده | ||
| برآورد مقادیر هدررفت خاک از طریق اندازهگیری شاخصهای میدانی روشی کمهزینه و برای یادگیری و استفادة کاربران آسان است. به منظور اندازهگیری و ارزیابی مقادیر هدررفت خاک برآوردشده با روش شاخصهای میدانی در حوضة آبخیز شهرک، نخست نقشة واحدهای کاری تهیه و شاخصهای میدانی در واحدهای کاری اندازهگیری شد. پس از واسنجی و اعتبارسنجی مدل EPM برای منطقة مورد مطالعه، صحت مقادیر هدررفت خاک اندازهگیریشده با شاخصهای میدانی با استفاده از مدل تجربی مذکور ارزیابی شد. مقدار میانگین خطای نسبی کم (برابر 6/7) و ضریب همبستگی بالا (برابر 9/0) بین مقادیر هدررفت خاک برآوردشده به روش شاخصهای میدانی و مدل EPM نشان‌دهندة صحت روش شاخصهای میدانی در برآورد هدررفت خاک منطقة مورد مطالعه است. مقادیر میانگین فرسایش خاک مربوط به شاخص رخنمون سنگ 61/47 تن در هکتار، تجمع رسوب پشت مانع 78/34 تن در هکتار، پدستال 61/22 تن در هکتار، فرسایش شیاری 67/5 تن در هکتار، زهکش اراضی 21/2 تن در هکتار و فرسایش خندقی 17/2 تن در هکتار بهدست آمد. | ||
| کلیدواژه‌ها | ||
| حوضة آبخیز شهرک؛ شاخص های میدانی؛ هدررفت خاک؛ مدل تجربی EPM | ||
| عنوان مقاله [English] | ||
| Assessment of soil loss estimation method by field indicators (Case study: Shahrak Watershed, Taleghan Basin) | ||
| نویسندگان [English] | ||
| Nayereh Ghazanfarpour1؛ Sadat Feiznia2؛ Hassan Ahmadi2؛ Mohammad Jafari2؛ Masoud Nasri3 | ||
| 1PhD, Natural Resources Dept., University of Tehran | ||
| 2, Natural Resources Dept., University of Tehran | ||
| 3Associate Professor, Islamic Azad University, Ardestan | ||
| چکیده [English] | ||
| Estimation of the amount of soil loss measurement of field indicators is a low-cost method, is easy to learn and can be simply applied. In order to measure and make assessment of soil loss amount by field indicators method in Shahrak Watershed, first map of the work units was prepared and then, measurements of the relevant field indicators were carried out within these units. Then, EPM model was calibrated and verified. Then the measured data for the amount of the soil loss obtained by using field indicators were analysed and assessed using EPM experimental model. Mean of relative error and correlation coefficient between values from filed indicators method and EPM model were around 7.6 and 0.9, respectively which these results verify field indicators method for estimation of soil loss intensity. Estimation of the average of soil loss amounts relevant to each of the field indicators shows the following soil losses: Rock exposure indicator: 47.61 (ton/ha), Pedestal indicator: 22.61 (ton/ha), Rill indicator: 5.67 (ton/ha), Sediment in drains indicator: 2.21 (ton/ha), Gully indicator: 2.17 (ton/ha) and Build up against barriers indicator: 34.78 (ton/ha). | ||
| کلیدواژه‌ها [English] | ||
| Field indicators, Soil loss, EPM experimental model, Shahrak Watershed | ||
| مراجع | ||
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