نتایج جستجو برای: Manning coefficient

تعداد نتایج: 170674  

Journal: :تحقیقات مهندسی کشاورزی 0
هادی رمضانی اعتدالی دانشجوی دکتری عبدالمجید لیاقت دانشیار گروه آموزشی مهندسی آبیاری و آبادانی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران فریبرز عباسی دانشیار مؤسسه تحقیقات فنی و مهندسی کشاورزی کرج

the manning roughness coefficient is an important parameter in the design and evaluation of furrow irrigation. despite its importance, estimation of this parameter for surface irrigation is very difficult, particularly in furrow irrigation. in this study, an evalue model was used to estimate the manning roughness coefficient in furrow irrigation. the model was based on volume balance and develo...

Journal: :محیط شناسی 0
میر امید هادیانی مربی گروه محیط زیست، دانشکده منابع طبیعی، دانشگاه آزاد اسلامی، واحد قائم شهر وحید غلامی دانشجوی دکتری آبخیزداری از دانشگاه آزاد اسلامی تهران, واحد علوم و تحقیقات زهرا نژادآذر عضو باشگاه پژوهشگران جوان دانشگاه آزاد اسلامی واحد قائم شهر

there are different methods for controling the flood damages which one of them is flood zoning. in this method, flood zones are determined by simulating river hydraulic behavior and its flood plain for different return periods.in other hand, soil and specially plant coverage are the most effective factor to determine manning roughness coefficient. so it is expected, seasonal plant coverage chan...

Journal: :آب و خاک 0
بهرامی یاراحمدی بهرامی یاراحمدی شفاعی بجستان شفاعی بجستان

abstract in all river engineering projects, determination of flow resistance is essential. most commonly, the manning roughness coefficient, , is used to describe the flow resistance or relative roughness of main channel or flood plane. over the past decades little or no study has been conducted to investigate the effects of particle shapes on manning roughness coefficient. therefore, it is the...

An increase in the flow velocity in flowthrough large porous media and deflection of flow regime from Darcy law causes a nonlinear relationship between hydraulic gradient and pore velocity of media. So many investigations have done previously in such Medias. One of the most important subjects in flowthrough large porous media is relationship between friction coefficient and flow characteristics...

Journal: :Open Engineering 2023

Abstract Assessment of Manning’s unevenness factor is critical significance in hydraulic readings open channel stream. ( n n ) obligatory for the computation releases, water levels, and backwater curves, as well plan curve additions. The correct value roughness coefficient ), i. H. a that accurately reflects observed d...

Journal: :Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 2015

2013
Lianyuan Zheng Robert H. Weisberg Yong Huang Rick A. Luettich Joannes J. Westerink Patrick C. Kerr Aaron S. Donahue Gary Crane Linda Akli

[1] We apply the Finite Volume Coastal Ocean Model to simulate the Hurricane Ike storm surge using two-dimensional (2-D) and three-dimensional (3-D) formulations. The high resolution, unstructured grid extends over the Gulf of Mexico with open boundaries in the Straits of Florida and the Yucatan Channel. With the same wind and pressure forcing, the bottom drag coefficients for the baseline 2-D ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید