نتایج جستجو برای: rate of sediment load

تعداد نتایج: 21210305  

     In this study, the predictive performance of three Artificial Neural Networks (ANNs), i.e. Co-Active NeuroFuzzy Inference System (CANFIS), Multi-Layer Perceptron (MLP) and MLP integrated with Genetic Algorithm (GA) in the Zoshk-Abardeh watershed were compared. In this study, three scenarios were considered and simulated in each model. In order to simulate the scenario S1 water flow were fe...

Journal: :international journal of environmental research 2014
f. oudghiri j.l. garcía-morales n. allali m.r. rodríguez-barroso

this study proposes a method employing thermogravimetric analysis (tg) to predict pollutionlevels by heavy metals (cr, cu, ni, zn, pb, cd and hg) in port sediments close to urban and industrial sitesfrom bay of cádiz. for this purpose, the thermogravimetric results of 14 sediment samples were recorded andshowed two characteristic ranges of temperatures (w1 as weight loss, %: 200-650°c) vs. (w2 ...

2016
James T. Morris Donald C. Barber John C. Callaway Randy Chambers Scott C. Hagen Charles S. Hopkinson Beverly J. Johnson Patrick Megonigal Scott C. Neubauer Tiffany Troxler Cathleen Wigand

A mixing model derived from first principles describes the bulk density (BD) of intertidal wetland sediments as a function of loss on ignition (LOI). The model assumes that the bulk volume of sediment equates to the sum of self-packing volumes of organic and mineral components or BD = 1/[LOI/k1 + (1-LOI)/k2], where k1 and k2 are the self-packing densities of the pure organic and inorganic compo...

Journal: :مرتع و آبخیزداری 0
عطااله کاویان استادیار و عضو هیئت علمی دانشگاه علوم کشاورزی و منابع طبیعی ساری فاطمه آدینه کارشناس ارشد آبخیزداری دانشگاه علوم کشاورزی و منابع طبیعی ساری قربان وهاب زاده استادیار دانشگاه علوم کشاورزی و منابع طبیعی ساری عبدالواحد خالدی درویشان استادیار و عضو هیئت علمی دانشگاه تربیت مدرس

investigating downstream changes in bed load shape can be useful to detect watershedhydrological processes and it is very important to design hydraulic structures and to managecapacity of large storage dams, properly. regarding to doing of enforcement studies, thisresearch was conducted in qalesar river in upstream of chahardangeh watershed in mazandaranprovince. after recognition of the study ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند 1389

there has been a gradual shift of focus from the study of rule systems, which have increasingly been regarded as impoverished, … to the study of systems of principles, which appear to occupy a much more central position in determining the character and variety of possible human languages. there is a set of absolute universals, notions and principles existing in ug which do not vary from one ...

Journal: :تحقیقات جغرافیایی 0
محمود حبیب اللهیان دانشگاه حکیم سبزواری احمد نوحه گر دانشکده محیط زیست دانشگاه تهران علیرضا کمالی منابع طبیعی محمود حبیب اللهیان دانشگاه حکیم سبزواری معصومه رخبین پردیس دانشگاهی قشم دانشگاه هرمزگان احمد نوحه گر دانشکده محیط زیست دانشگاه تهران

â increase in wastage of soil resources in watershed is a persistent challenge that with increase in population and pressure on natural sources and unstable plantation on gradient farms and soils cause production reduces on farms, and also decrease in daily ratio of farms to population can cause more pressure on lands and natural resources.lavarefin watershed placed in 60 km from bandarabass in...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده اقتصاد و علوم اجتماعی 1390

abstract deviation or in other words committing a crime is literally a social problem. this research that was conducted in 1389 and 1390 has tried to investigate the causes of crimes committed by young male inmates qazvin central prison and effective variables on their tendency to deviation. accordingly after collecting theoretical framework and offering theoretical model including both hirsch...

2008
Henry Vallius Mirja Leivuori

A large number of sediment samples representing most of the active mud accumulation areas of the Gulf of Finland were studied for total cadmium, chromium, lead, mercury, arsenic, copper and zinc. The highest concentrations of metals were found in sediment surfaces in the easternmost part of the Gulf, which is influenced by the inflow of the Neva river and the loads of the city of St. Petersburg...

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