خصوصیات اندازه ذرات رسوبات معلق انتقالی در جریان پایه و سیلابی رودخانه

نوع مقاله: یاداشت‌ فنی

نویسندگان

1 دانش‌آموخته کارشناسی ارشد گروه مهندسی آبخیزداری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور

2 دانشیار گروه مهندسی آبخیزداری، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور

چکیده

مطالعه حاضر با هدف بررسی خصوصیات اندازه ذرات رسوبات معلق انتقالی در جریان پایه و سیلابی رودخانه کجور واقع در حوزه آبخیز جنگلی کجور با مساحت حدود 50000 هکتار انجام پذیرفت. به‌منظور تعیین و آنالیز توزیع اندازه ذرات، پس از نمونه‌برداری رسوبات معلق از جریان طی مقاطع مختلف زمانی، از قانون استوکس و روش پیپت اصلاح شده و نیز نرم‌افزار GRADISTAT استفاده شد. نتایج حاصل از تحقیق نشانگر اختصاص به‌ترتیب 81/1، 3/4 و 15/3 درصد در جریان پایه و 56/5، 17/0 و 26/5 درصد در شرایط سیلابی برای ذرات ماسه، لای و رس بود.
 
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Particle Size Characteristics of Suspended Sediment Transported in River Base and Flood-Flows

نویسندگان [English]

  • Mahbobeh Kiani Harchegani 1
  • Seyed Hamid Reza Sadeghi 2
1 Graduated Student of Watershed Management, Dept. of Natural Resources and Marine Sciences, Tarbiat Modarres Universicy, Noor
2 Assoc. Prof. of Watershed Management, Dept. of Natural Resources and Marine Sciences, Tarbiat Modarres University, Noor
چکیده [English]

This present study was conducted to determine particle size characteristics of suspended sediments transported by base and flood-flows in theKojurRiverin Kojur forest watershed with an area of 50000 ha. Sediment samples were analyzed based on Stokes’ law using a modified pipette and applying the GRADISTAT software. Results showed 81.1, 3.4 and 15.3% for sand, silt, and clay, respectively, in base flow conditions while under flood conditions, the same values were 56.5, 17.0 and 26.5%.
 
 

کلیدواژه‌ها [English]

  • Particle size distribution
  • Suspended sediment concentration
  • Base flow
  • Kojur Watershed
  • Mazandaran
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