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تحلیل و مدل‌سازی تغییرات مکانی رسوب در آبراهۀ فصلی با استفاده از شبیه‌ساز باران | ||
| اکوهیدرولوژی | ||
| مقاله 17، دوره 5، شماره 2، تیر 1397، صفحه 571-584 اصل مقاله (1.39 M) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2018.239795.705 | ||
| نویسندگان | ||
| مریم اکبری1؛ امیر سالاری2؛ مهدی بشیری* 3 | ||
| 1کارشناس ارشد آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه تربت حیدریه | ||
| 2استادیار گروه تولیدات گیاهی، دانشکدۀ کشاورزی و منابع طبیعی و پژوهشگر پژوهشکدۀ زعفران دانشگاه تربت حیدریه | ||
| 3استادیار گروه مرتع و آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه تربت حیدریه | ||
| چکیده | ||
| بررسی تغییرات مکانی رسوب و عواملی که بر آن تأثیر می‌گذارد، برای کنترل آن امری ضروری است. در این پژوهش تغییرات مکانی ویژگیهای تولید و غلظت رسوب طی آبراهۀ فصلی واقع در تیپ دشتسر فرسایشی بررسی شد. مکانیابی کرتها در فواصل 50 متری انجام و آزمایشها در 10 نقطه (با سه تکرار) اجرا شد. برای بررسی مقادیر رسوب تولیدی و غلظت آن، بارشی با شدت 4/1 میلیمتر در دقیقه و دوام 10 دقیقه توسط شبیه‌ساز باران ایجاد و از مجاورت هر کرت، نمونه خاک سطحی برداشت شد. پس از انجام تحلیلهاى آمارى، با استفاده از روش کوکریجینگ، نقشۀ توزیع مکانی متغیرها تهیه شد. نتایج نشان داد بین غلظت رسوب 10 نقطۀ نمونهبرداریشده تفاوت معناداری وجود نداشت، اما بین مقادیر بار رسوب نقاط تفاوت معنادار مشاهده شد. نتایج برازش مدلهای تجربی بر نیمتغییرنماها نشان داد بهترین مدل برای ساختار مکانی غلظت رسوب، مدل گوسین و برای بار رسوب، مدل نمایی است و هر دو متغیر، ساختار مکانی خوبی دارند. نتایج اعتبارسنجی مدلها نیز نشان داد روش کوکریجینگ نقطهای، دقت کمی برای تخمین غلظت رسوب دارد، اما برای تخمین بار رسوبی، از دقت بیشتری برخوردار است. | ||
| کلیدواژه‌ها | ||
| دانه بندی؛ درون یابی؛ دشتسر فرسایشی؛ مدل‌سازی مکانی | ||
| عنوان مقاله [English] | ||
| Analysis and modeling of the spatial variations of sediment in seasonal stream using rainfall simulator | ||
| نویسندگان [English] | ||
| MARYAM AKBARI1؛ amir salari2؛ mehdi bashiri3 | ||
| 1M.Sc. Student in Watershed Management, Faculty of Natural Resources, University of Torbat Heydarieh, E.Mail: akbari | ||
| 2Assistant Professor, Department of Plant Production, Faculty of Agricultural and Natural Resources, University of Torbat Heydarieh, | ||
| 3Department of range and watershed management, Faculty of natural resources, university of torbat heydarieh, Khorasan-Razavi, Iran | ||
| چکیده [English] | ||
| Study of the spatial variations of sediment and its influencing factors, is essential to control it. In this study, the spatial variations of production characteristics and sediment concentration in a seasonal stream located in an erosional pediment, studied. The location of plots at the 50 meters intervals selected and experiments done in 10 locations (with 3 replications). Then a rainfall with rainfall intensity of 1.4 mm/min and duration of 10 minutes, created using rainfall simulator and in the vicinity of each plot, surface soil samples were taken. The statistical analysis performed then using the cokriging method, the spatial distribution of characteristics prepared. The results showed that for sediment concentration variable among 10 locations, was no significant difference, but for the sediment load variable it was significant. The results of fitting experimental models on semivariograms, showed that the best fitted model to the spatial pattern of sediment concentration was gaussian and for sediment load was exponential model, respectively. Also two mentioned variables had strong spatial patterns. The results of the validation of applied model showed that the point-cokriging method has low accuracy to estimate sediment concentration, but for estimation of sediment load, the method has higher accuracy. | ||
| کلیدواژه‌ها [English] | ||
| Erosional pediment, Granulometry, interpolation, Spatial modeling | ||
| مراجع | ||
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