نتایج جستجو برای: namely damages received from sediment

تعداد نتایج: 5835241  

Journal: :Water 2022

Building inland waterways affects the natural structure, formation, and extent of riverbed riparian zone. It alters hydrology sediment deposition conditions hence damages aquatic ecosystem. To address effects construction on riverine biome, benthic macroinvertebrate communities were compared at different building stages along a gradient shipping traffic density two montane rivers in China. The ...

Journal: :مرتع و آبخیزداری 0
سید حمید رضا صادقی استاد گروه آبخیزداری، دانشکدة منابع طبیعی، دانشگاه تربیت مدرس شیرکوه ابراهیمی محمدی استادیار گروه مرتع و آبخیزداری، دانشکدة منابع طبیعی، دانشگاه کردستان کامران چپی استادیار گروه مرتع و آبخیزداری، دانشکدة منابع طبیعی، دانشگاه کردستان

the behavior of suspended sediment during flood events is not only a function of energy conditions, i.e. sediment is stored at low flow and transported under high flow conditions, but also is related to the variations in sediment supply and sediment depletion. these changes in sediment availability result in so-called hysteresis effects. therefore, hysteresis pattern analysis is of great import...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیخ بهایی - دانشکده زبانهای خارجی 1391

phatic communion is a cultural concept which differs across cultures. according to hofstede (2001), the u.s. tends to have individualistic culture; however, asian countries tend to have collectivistic cultures. these cultures view phatic communion differently. in individualistic cultures like u.s., phatic communion reflects speakers’ socio-cultural relationships in conversations. to see whether...

Journal: :desert 2009
h. ahmadi a. a. mohammadi

to identify critical sediment sources in large catchments, using easily available terrain information at a regionalscale, a methodology was developed to obtain a qualitative assessment necessary for environmental management.fargas et al method was employed in the research. the study was carried out in one of the sub-basins of hableh roodbasin called dehnamak in the arid and semiarid climate of ...

اکبری کردخیلی, وحید, خنکدار طارسی, عباس, عزیزی, سهیل, نبی پور, احسان,

Background and purpose: Ischemia-reperfusion injuries (I/RI) are the major causes of liver failure after various types of liver surgeries, particularly liver transplantation. Reactive oxygen species (ROS) are the major causes of such injuries, therefore, antioxidant therapy to attenuate hepatic lesions is preferred. We aimed to evaluate the effects of silibinin, a potent radical scavenger, on l...

Journal: :مرتع و آبخیزداری 0
کاظم نصرتی دانشیار دانشکدة علوم زمین دانشگاه شهید بهشتی فروزان احمدی دانشجوی دکتری ژئومورفولوژی - مدیریت محیطی، دانشگاه شهید بهشتی علی اکبر نظری سامانی دانشیار دانشکدة منابع طبیعی دانشگاه تهران محمد رضا ثروتی استاد دانشکدة علوم زمین دانشگاه شهید بهشتی

soil erosion is one of the most destructive phenomena which cause significant ecological changes in many areas. soil conservation and erosion control is essential because of the irreparable damage caused by soil erosion. soil conservation programs will not achieve until to find adequate methods of combating land degradation and ways to reduce the sediment. therefore, we need to have enough know...

ژورنال: علوم آب و خاک 2017
زارع خورمیزی, مهناز, سلیمانی, کریم, نصرتی, کاظم, کاویان, عطااله,

Obtaining information about relative importance of sediment sources and their contributions on sediment production and thus identification of on-site critical areas is required for implementing soil and water conservations and sediment control programs. For this reason, in this study 35 geochemical tracers and organic carbon were measured in 45 samples of sediment sources and in 11 watershed se...

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