تحلیل و مدل‌سازی تغییرات مکانی رسوب در آبراهۀ فصلی با استفاده از شبیه‌ساز باران

نوع مقاله: پژوهشی

نویسندگان

1 کارشناس ارشد آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه تربت حیدریه

2 استادیار گروه تولیدات گیاهی، دانشکدۀ کشاورزی و منابع طبیعی و پژوهشگر پژوهشکدۀ زعفران دانشگاه تربت‏ حیدریه

3 استادیار 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

موضوعات


عنوان مقاله [English]

Analysis and modeling of the spatial variations of sediment in seasonal stream using rainfall simulator

نویسندگان [English]

  • MARYAM AKBARI 1
  • amir salari 2
  • mehdi bashiri 3
1 M.Sc. Student in Watershed Management, Faculty of Natural Resources, University of Torbat Heydarieh, E.Mail: akbari
2 Assistant Professor, Department of Plant Production, Faculty of Agricultural and Natural Resources, University of Torbat Heydarieh,
3 Department 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
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