نتایج جستجو برای: sediment source discrimination

تعداد نتایج: 514885  

Journal: :desert 0
k. nosrati assistant professor, shahid beheshti university, tehran, iran h. ahmadi professor, science and research branch, islamic azad university, tehran, iran f. sharifi associate professor, forest, range and watershed management organization, tehran, iran m. mahdavi emeritus professor, university of tehran, karaj, iran m.r. sarvati associate professor, shahid beheshti university, tehran, iran

uncertainty associated with mixing models is often substantial, but has not yet been fully incorporated in models. the objective of this study is to develop and apply a bayesian-mixing model that estimates probability distributions of source contributions to a mixture associated with multiple sources for assessing the uncertainty estimation in sediment fingerprinting in zidasht catchment, iran....

Journal: :desert 2013
k. nosrati h. ahmadi f. sharifi m. mahdavi m.r. sarvati

uncertainty associated with mixing models is often substantial, but has not yet been fully incorporated in models. the objective of this study is to develop and apply a bayesian-mixing model that estimates probability distributions of source contributions to a mixture associated with multiple sources for assessing the uncertainty estimation in sediment fingerprinting in zidasht catchment, iran....

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,...

Journal: :journal of tethys 0

sediments are generally regarded as the sink for dissolved elements carried out to the sea by rivers. in order to study the source and mechanism of metal transport in sea water, 123 surface sediment samples were taken by using grab sampler in the northwest part of the persian gulf in summer. grain size analysis and geochemical analysis by icp-oes were carried out on samples after sample prepara...

Journal: :مرتع و آبخیزداری 0
کاظم نصرتی دانشیار گروه جغرافیای طبیعی، دانشکده علوم زمین، دانشگاه شهید بهشتی، ایران سعیده جلالی دانش آموخته ژئومورفولوژی، دانشکده علوم زمین، دانشگاه شهید بهشتی، ایران

identifying sediment sources is one of important factors in selecting of appropriate method of erosion control and soil conservation. the main objective of this study is to estimateuncertainty and contribution of forest roads to sediment yield in ziarat drainage basin, gorgan city using geochemical tracers. for this purpose, 47 soil samples were collected from different sources with different l...

Journal: :مرتع و آبخیزداری 0
علی فضل الهی استادیار، دانشکده منابع طبیعی، دانشگاه گیلان، ایران. علی سلاجقه استاد، دانشکده منابع طبیعی، دانشگاه تهران، ایران. سادات فیض نیا استاد، دانشکده منابع طبیعی، دانشگاه تهران، ایران. حسن احمدی استاد، دانشکده منابع طبیعی، دانشگاه تهران، ایران.

sediment fingerprinting is a method for identifying sediment sources and determining the rate of contribution of each source. in this method, the natural tracer technology is used, that combined from samples collection, laboratory analyzing and statistical modeling. the natural tracers are measured in both the sources and suspended sediment to determine the rate of contribution each sources. th...

Journal: Desert 2012
F. Sharifi H. Ahmadi K. Nosrati M. Mahdavi M.R. Sarvati

Uncertainty associated with mixing models is often substantial, but has not yet been fully incorporated in models. The objective of this study is to develop and apply a Bayesian-mixing model that estimates probability distributions of source contributions to a mixture associated with multiple sources for assessing the uncertainty estimation in sediment fingerprinting in Zidasht catchment, Iran....

Journal: :Journal of Hydrology 2022

• The Brazilian semiarid is the most densely populated dry region in world. Sediment source apportionment was quantified a ephemeral catchment. combination of conventional and alternative tracers improved discrimination. Our results may gain high visibility given climate change projections for regions. Although underline need creation integrated strategies to protect water resources semiarid, s...

Journal: :The Journal of the Acoustical Society of America 1986

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