استفاده از یک مدل ژئومورفولوژیکی مبتنی بر توان جریان برای پهنه‌بندی فرسایش و رسوب‌خیزی حوضه‌های آبریز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار دانشگاه بین‌المللی امام خمینی(ره) قزوین، دانشکدة فنی و مهندسی، گروه مهندسی آب

2 کارشناس ارشد دانشگاه بین‌المللی امام خمینی(ره) قزوین، دانشکدة فنی و مهندسی،گروه مهندسی آب

چکیده

تأمین اطلاعات مورد نیاز برای مدل‌های فرسایش و رسوب از مشکلات عمدة به‌کارگیری این مدل‌هاست. در این پژوهش مدلی ژئومورفولوژیکی معرفی می‌شود که بر مبنای تئوری قدرت جریان توسعه‌ یافته و برای محاسبة پتانسیلِ فرسایشِ منجر به تولیدِ رسوبِ ورودی به رودخانه‌ها از دو پارامتر شیب و مساحت ویژة زهکشی استفاده می‌کند. مدل مزبور فقط با تکیه بر نقشة ارتفاعی رقومی قادر به ناحیه‌‌بندی حوضه بر اساس حساسیت به فرسایش است. برای ارزیابی نتایج مدل ژئومورفولوژیکی از مدل MPSIAC و برای واسنجی مدل مزبور، به کمک آمار رسوب ثبت‌شده و به روش حد وسط دسته‌ها، آورد رسوبی حوضه تعیین شد. ناحیه‌بندی انجام‌شده توسط دو مدل تطابقی مناسب دارند. از میان عوامل نه‌گانة MPSIAC مجموع عوامل توپوگرافی و فرسایش سطحی بیشترین همبستگی را با مدل ژئومورفولوژیکی نشان می‌دهند. این امر بدان معنی است که نمی‌توان از مدل ژئومورفولوژیکی در مناطقی که فرسایش غالب در آن‌ها فرسایش خندقی و رودخانه‌ای است استفاده کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Use of the Geomorphological Model, Based on the Stream Power, for Zoning Erosion and Sedimentation in Watersheds

نویسندگان [English]

  • Alireza Shokoohi 1
  • Sahar Beheshti 2
1 Associate Professor in water resources Engineering, Faculty of Engineering and Technology, Imam Khomeini International University, Qazvin, Iran
2 M.SC graduate student of Water Engineering Department, Imam Khomeini International University, Qazvin, Iran.
چکیده [English]

Providing information for erosion and sediment yield simulation in watersheds is the major concern in employing the corresponding models. throughout this paper, a geomorphological model based upon stream power theory is introduced. In this model, for simulating the potential erosion leading to sediment load in rivers, two parameters namely: slope and specific catchment area are employed. The model which uses just a Digital Elevation Model (DEM) to provide the required information is capable of zoning watersheds as based on the susceptibility of landscape to erosion. This advantage makes the model an efficient and affordable tool for initial planning in soil conservation projects regarding their importance in dam and river engineering studies. The MPSIAC model is employed to evaluate the results of the geomorphological model, while the recorded sediment data in the study river was used to calibrate MPSIAC. While the performance of the two models was close, regression relationship between the nine factors of MPSIAC
model and geomorphological model showed that the factors of topography and surface erosion in MPSIAC constitute the most related parameters.

کلیدواژه‌ها [English]

  • geomorphological model
  • stream power
  • MPSIAC
  • Sediment Rating Curve
  • susceptibility to erosion
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