کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7113927 1461078 2018 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measurement of dimensionless Chezy coefficient in step-pool reach (Case Study of Dizin River in Iran)
ترجمه فارسی عنوان
اندازه گیری ضریب چگالی بدون بعد در رسیدن به سطح قله (مطالعه موردی رودخانه دیزین در ایران)
کلمات کلیدی
گام به گام، مقاومت در برابر جریان، رودخانه های کوهستانی، ضریب چزی، رودخانه دیزین،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی کنترل و سیستم های مهندسی
چکیده انگلیسی
Step-pool reaches are common bed forms in mountainous streams exceeding 3% gradient and provide an important means of flow resistance in steep rivers. Step-pool channels are characterized by longitudinal steps formed by large boulders which are constituted into discrete channel-spanning accumulations that separate pools comprising finer grain. Flow resistance, reflected by roughness materials, appears to be an important control on bed load transport rates and mean flow velocity. To estimate flow resistance some morphological features and velocity were measured in the step-pool channel of Dizin River, located in Karaj River watershed in Iran. Topographic surveys and bed sediment sampling were made in low flow condition while three-dimensional velocity measurements were made in low, medium and high flow conditions. As flow resistance is a function of geometric, bed material size, longitudinal slope and hydraulic radius, dimensional analysis was conducted to derive a non-dimensional relationship for Chezy coefficient in step-pool reaches. Thereafter, it was calibrated for the measured data set of Dizin, Ammameh and Rio Cordon. Comparable results of calibration with a river located in a different environment may suggest that flow resistance features in semi arid and humid streams may have similar effects on non-dimensional Chezy coefficient.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flow Measurement and Instrumentation - Volume 61, June 2018, Pages 15-25
نویسندگان
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