نتایج جستجو برای: sediment transport

تعداد نتایج: 305291  

2016
James T Liu Zhi-Jun Dai James T. Liu Ya-Ping Lei Xiao-Ling Zhang

DAI, Z.-J.; LIU, J.T.; LEI, Y.-P., and ZHANG, X.-L., 2010. Patterns of sediment transport pathways on a headland bay beach—Nanwan Beach, South China: a case study. Journal of Coastal Research, 26(6), 1096–1103. West Palm Beach (Florida), ISSN 0749-0208. Embayed beaches bounded by headlands, headland bay beaches, are a common feature along the coast of southern China. The patterns of sediment tr...

Journal: :آب و خاک 0
مرضیه خضریان محمدرضا مجد زاده طباطبایی سیدسعید موسوی ندوشنی

abstract the concept of armouring is used to discuss the coarse surface layer in rivers. selective erosion in an alluvial channel reach for which there is no upstream sediment supply can lead to formation of a layer coarser than the under laying material. this phenomenon inhibits sediment transport from the reach.numerical modeling of armouring river bed, provides an approach to simulation of t...

2004
Hua Lu Christopher Moran Ian Prosser Murugesu Sivapalan

Sediment delivery ratio (SDR) is traditionally defined as the fraction of upland gross erosion that is transported out of a defined area, e.g., a plot or catchment. It is, effectively, an index of sediment transport efficiency. Previously, it is treated as an empirically-lumped parameter used as a mechanism for compensating for sediment deposition within a catchment area. In this paper, we prop...

2012
Nidal Hadadin

This study investigated the effect of cross sectional geometry on sediment transport rate. The processes of sediment transport are generally associated to environmental management, such as pollution caused by the forming of suspended sediment in the channel network of a watershed and preserving physical habitats and native vegetations, and engineering applications, such as the influence of sedi...

Houshang Hasounizadeh Reza Tajmehr Samaneh Abdeveis,

Accumulation of sediment transport volume and reduce the useful life of dams, water storage tanks can be. So far, many methods for calculating sediment this is presented in reservoirs are generally classified into two categories: mathematical modeling and experimental .This study examines the effect of using Gstars model parameters in the model, deposition of sediment in the reservoir tank and ...

2000
Jing Lou David J. Schwab Dmitry Beletsky Ann Arbor Nathan Hawley

A quasi-three-dimensional suspended sediment transport model was developed and generalized to include combined wave-current effects to study bottom sediment resuspension and transport in southern Lake Michigan. The results from a threedimensional circulation model and a wind wave model were used as input to the sediment transport model. Two effects of nonlinear wave-current interactions were co...

2010

This paper investigates the scaling of sediment transport by waves in the nearshore. Scaling of sediment is often needed in laboratory wave flumes where spatial dimensions are about a factor 10 smaller. Generally, for the physical model, normal sand is chosen with a relatively small diameter. Scaling relations are consulted to translate the spatial dimension and sediment flux to prototype value...

Journal: :آب و خاک 0
سید علی موسوی ابراهیم امیری تکلدانی محمدهادی داودی

abstract rockfill dams are a type of hydraulic control structures used to protect river bed in cases where a considerable reservoir volume is available behind these structures; it could mitigate the floods and provide a gradual depletion of incoming volume of water so that the discharge passing downstream is decreased. one of the main issues on utilizing rockfill dams is to keep its permeabilit...

Journal: :تحقیقات آب و خاک ایران 0
سیده کوثر دانش یار دانشجوی کارشناسی ارشد گروه خاک شناسی دانشکدة علوم کشاورزی دانشگاه گیلان حسین اسدی استادیار گروه خاک شناسی دانشکدة علوم کشاورزی دانشگاه گیلان سید علی موسوی مربی گروه مهندسی آب دانشکدة علوم کشاورزی دانشگاه گیلان

the understanding soil erosion processes and the development of accurate erosion prediction models require understanding of detachment, deposition and sediment transport in rills. to evaluate the effect of soil type and flow stream power on the relative importance of flow driven processes of sediment transport, and on the boundary between the processes regarding to particle size, experiments we...

Several types of sediment transport equations have been developed for estimation of the river sediment materials during the past decades. The estimated sediment from these equations is very different, especially when they applied for a specific river. Therefore, choice of an equation for estimation of the river sediment load is not an easy task. In this study 10 important sediment transport equ...

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