نتایج جستجو برای: suspended sediment formulae

تعداد نتایج: 71491  

2017
Jose Ramon B. Cantalice Luis da Silva Souza Yuri Jacques Agra Bezerra Silva Sergio M.S. Guerra Alex Mauricio Araújo Douglas Monteiro Cavalcante Cinthia Maria Cordeiro Atanazio Cruz Silva

Sediment transport relates to suspended sediment and bedload. The suspended sedi‐ ment plays the most important role on the land-ocen sediment flux. On the other hand, the bedload should be considered in order to assess the impacts of dams on sediment transport and sediment yield. Recent effects of dam construction have been widely reported. The sediment load has been reduced by more than 75% f...

1999
Desmond E. Walling Philip N. Owens Graham J. L. Leeks

Statistically veri®ed composite ®ngerprints and a multivariate mixing model have been employed to establish the main sources of the suspended sediment transported through the lower, non-tidal reaches of the River Ouse and one of its main tributaries, the River Wharfe, during the period 1994±1997. In the case of the suspended sediment samples collected from the River Ouse, the load-weighted mean...

2001
Robert B. Thomas

Because of high costs or complex logistics, scientific populations cannot be measured entirely and must be sampled. Accepted scientific practice holds that sample selection be based on statistical principles to assure objectivity when estimating totals and variances. Probability sampling--obtaining samples with known probabilities--is the only method that assures these results. However, probabi...

2013
Jie Wang Hiroshi Ishidaira Wenchao Sun Shaowei Ning

Suspended sediment concentration of a river can provide very important perspective on erosion or soil loss of one river basin ecosystem. The changes of land use and land cover, such as deforestation or afforestation, affect sediment yield process of a catchment through changing the hydrological cycle of the area. A sediment rating curve can describe the average relation between discharge and su...

2013
Nu-Fang Fang Zhi-Hua Shi Ben-Jiang Yue Ling Wang

A large amount of soil loss is caused by a small number of extreme events that are mainly responsible for the time compression of geomorphic processes. The aim of this study was to analyze suspended sediment transport during extreme erosion events in a mountainous watershed. Field measurements were conducted in Wangjiaqiao, a small agricultural watershed (16.7 km(2)) in the Three Gorges Area (T...

Journal: :The Journal of experimental biology 2014
Amelia S Wenger Mark I McCormick Geoffrey G K Endo Ian M McLeod Frederieke J Kroon Geoffrey P Jones

Increasing sediment input into coastal environments is having a profound influence on shallow marine habitats and associated species. Coral reef ecosystems appear to be particularly sensitive, with increased sediment deposition and re-suspension being associated with declines in the abundance and diversity of coral reef fishes. While recent research has demonstrated that suspended sediment can ...

2014
M Z Qamar

The natural resources of Himalayas in terms of hydro power generation are not only crucial for the Himalayan states of India, but very important for the whole country. These states seem to be keen in exploiting their vast hydro electricity potential for net revenue earning. However, due to weak geological conditions and steep slopes these rivers carry a huge quantity of sediment with them. The ...

A Salehpour Jam M Tabatabaei,

Sediment rating curve (SRC) is a conventional and a common regression model in estimating suspended sediment load (SSL) of flow discharge. However, in most cases the data log-transformation in SRC models causing a bias which underestimates SSL prediction. In this study, using the daily stream flow and suspended sediment load data from Shalman hydrometric station on Shalmanroud River, Guilan Pro...

2011
Laurent O. Amoudry Alejandro J. Souza

Appropriate descriptions of turbulence are important in predicting sediment transport and seabed evolution. We use here a three-dimensional model to investigate the impacts of sediment-induced stratification, erosion parameterization, and turbulence closures on sediment transport and morphological simulations. The model is implemented in the Proudman Oceanographic Laboratory Coastal Ocean Model...

Journal: :اکو هیدرولوژی 0
سهیلا آقابیگی امین استادیار گروه منابع طبیعی، پردیس کشاورزی و منابع طبیعی، دانشگاه رازی علیرضا ایلدرومی دانشیار گروه مرتع و آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه ملایر حمیدرضا نوری استادیار گروه مرتع و آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه ملایر افسانه حقیقی کرمانشاهی دانش آموختۀ رشتۀ آبخیزداری، گروه مرتع و آبخیزداری، دانشکدۀ منابع طبیعی، دانشگاه ملایر

the devastating impact of land use change in the watershed is increasing the generation rate of sediment and entrance to rivers and sedimentation in reservoirs. according to this, studying on impact of land use change on hydrological process is necessary. aim of this study was investigating the impact of land use change on suspended sediment during 1994 to 2010 by swat model in dinevar watershe...

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