نتایج جستجو برای: sediment flow

تعداد نتایج: 514708  

Journal: :The Science of the total environment 2003
Andrew A Meharg Julian Wright Graham J L Leeks Paul D Wass Philip N Owens Des E Walling Daniel Osborn

PCB congener concentrations in the water column of a highly industrialized river catchment, the Aire/Calder, in N.E. England were determined weekly on a routine basis, and 2 hourly through selected high flow (flood) events. Bed, suspended and floodplain sediment PCB congener concentrations were also determined along transects of the rivers investigated. Weekly monitoring revealed that the sum o...

2002
J. Malarkey A. G. Davies Z. Li

A simple, quasi-steady, one-dimensional, vertical (1DV) model of unsteady sheet flow is presented. The central aim is to provide greater realism in the near-bed, high-concentration layer, than is possible using models based on the classical referenceconcentration approach. This is achieved by tracking erosion and deposition at the bottom of the mobile sediment layer in relation to the amount of...

Journal: :Journal of environmental quality 2007
Harold M Keener Britt Faucette Michael H Klingman

Soil loss rates from construction sites can be 1000 times the average of natural soil erosion rates and 20 times that from agricultural lands. Silt fence (SF) is the current industry standard used to control sediment originating from construction activities. Silt fences are designed to act as miniature detention ponds. Research has indicated that SF sediment filtering efficiency is related to i...

A Khosronejad

In the present paper, a 3D numerical model has been applied to predict the flow hydrodynamics around power intakes within the Dez dam reservoir. The Dez dam is a 203 m high, double arch concrete dam which is constructed by Italians in 1962. Since then, sedimentation in reservoirhas continued and since the dam does not have bottom outlet, the reservoir bed level is raising by a rate of about 2.5...

G. A. Barani, M. J. Khanjani and J. Ahmad- Auli,

In recent years, installation of plates in canal beds have been considered for sedimentation control and bed load reduction at canal intake. These planes, called submerged vanes, are different in dimensions. They are installed at intakes in-group with reasonable distance from each other. Presence of these vanes at intakes initiate transverse shear stress on river bed and causes sediment transpo...

G. A. Barani, M. J. Khanjani and J. Ahmad- Auli,

In recent years, installation of plates in canal beds have been considered for sedimentation control and bed load reduction at canal intake. These planes, called submerged vanes, are different in dimensions. They are installed at intakes in-group with reasonable distance from each other. Presence of these vanes at intakes initiate transverse shear stress on river bed and causes sediment transpo...

جعفریان, زینب, حبیب‌نژاد روشن, محمود, صالح, ایمان, کاویان, عطااله,

Soil erosion is one of the most serious environmental issues in the world. Vegetative buffer strips include a specific plant being passed by flow before entering the waterways, so it causes to reduce runoff volume, deposited pesticides and other pollutants of the flow through infiltration, absorption and sediment deposition. The present study has been carried out with aim to investigate the eff...

2000
Roger A. Kuhnle Andrew Simon

Excessive erosion, transport, and deposition of sediment in surface waters is a major problem in the United States. A national strategy is needed to develop scientifically defensible procedures to facilitate the development of TMDL's for clean sediment in streams and rivers of the United States. In the first part of this study data sets which contain sediment transport and flow data were identi...

ژورنال: آبخیزداری ایران 2019
Habibnejad, Mahmoud, Jafarian, Zeinab, Kavian, Ataollah, Saleh, Iman,

Non-point source pollution is considered as a serious issue especially in the field of eutrophication for surface waters. Vegetative buffer strips include a specific plant being passed by flow before entering the waterways, so it causes to reduce runoff volume, deposited pesticides and other pollutants of the flow through infiltration, absorption and sediment deposition. The present study has b...

2014
Wei LI Z. B. Wang

(CSC) " , " Het Lamminga Fonds " , and the Sino-Dutch collaboration project " Effects of human activities on the eco-morphological evolution of rivers and estuaries " (08-PSA-E-01) funded by the Royal Dutch Academy of Sciences (KNAW) and the Chinese Ministry of Science and Technology (MOST) within the framework of the Programme of Scientific Alliances between China and the Netherlands. Summary ...

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