نتایج جستجو برای: suspended sediment concentration

تعداد نتایج: 429955  

Journal: :Water Resources Research 2021

As a key component of global change, dam-induced sediment reduction occurs in large rivers worldwide, which has profound implications on the fluvial systems. However, systematic change suspended concentration (SSC) and its dynamic processes are not well known. We summarize typical SSC changes propose new modeling framework for heavily dammed systems with Changjiang (Yangtze River) as background...

Journal: :The Science of the total environment 2005
D E Walling

Recent years have seen a growing awareness of the wider environmental significance of the suspended sediment loads transported by rivers and streams. This includes the importance of fine sediment in the transport of nutrients and contaminants, including phosphorus (P). Sediment source exerts a key control on the physical and geochemical properties of suspended sediment, including its P content,...

2006
THOMAS E. JORDAN J. W. PIERCE DAVID CORRELL

There was a net influx of suspended particulate matter to the uppermost part of the Rhode River estuary during the several years of this study. Most of the influx was due to episodic discharges of suspended sediment from the watershed during heavy rains. In contrast, tidal exchange of particulate matter was not related to rainstorms. Sediment composition data and historical records indicate tha...

Journal: :Continental shelf research 2007
David K Ralston Mark T Stacey

Field observations of flow and sediment transport in a tributary channel through intertidal mudflats indicate that suspended sediment was closely linked to advection and dispersion of a tidal salinity front. During calm weather when tidal forcing was dominant, high concentrations of suspended sediment advected up the mudflat channel in the narrow region between salty water from San Francisco Ba...

Journal: :مرتع و آبخیزداری 0
محسن یوسفی کارشناس ارشد آبخیزداری، دانشکدة منابع طبیعی و کویرشناسی، دانشگاه یزد، ایران فاطمه برزگر عضو هیئت علمی دانشکدة کشاورزی دانشگاه پیام نور، ایران

suspended sediment estimation is an important factor from different aspects including, farming, soil conservation, dams, aquatic life, as well as various aspects of the research. there are different methods for suspended sediment estimation. this study aims to estimate suspended sediment using feed forward neural network with error back propagation with levenberg-marquardt back propagation algo...

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The sediment load that is transported by rivers can create numerous problems such as sedimentation in the reservoir and storage capacity reduction, developed load in the rivers, destruction of structures along the river and transfer of pollution. Therefore, an accurate estimate of the sediment load in rivers is absolutely essential for river engineering, reservoir design, sediment transportatio...

2014
A. Amini P. Heller

Numerical modeling of sediment transport in reservoirs, especially for sudden events such as flushing, is still a challenging research topic. In the present study, sediment transport and sediment flushing are simulated for a Peruvian reservoir. Situated in the Peruvian Andes, the watershed is affected by high erosion rates and the river carries high amounts of suspended sediment whose estimated...

2011
ARTHUR J. HOROWITZ Dallas L. Peck

In most aquatic systems, concentrations of trace metals in suspended sediment and the top few centimeters of bottom sediment are far greater than concentrations of trace metals dissolved in the water column. Consequently, the distribution, transport, and availability of these constituents can not be intelligently evaluated, nor can their environmental impact be determined or predicted solely th...

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