نتایج جستجو برای: wind sediments

تعداد نتایج: 111368  

ژورنال: کواترنری ایران 2019
Bayati Khatibi, Maryam, Karami, Fariba, Sari Sarraf, Behrooz,

Abstract  Sediments provide a continuous, sensitive record of changing conditions of environment and processes within plain and in the surrounding plain, thus they contain significant archives of past environmental change on the continents. Valuable informations on regional and global scale patterns of past climate variability in the Azarbayjan region have been documented by numerous paleocli...

Journal: :Estuarine Coastal and Shelf Science 2022

On the basis of observations and modelling plume generated by Misa River (AN, Italy), we performed a comprehensive study, which integrated different sources information (field data, numerical simulations, etc.), generation transport mechanisms river plumes flowing into microtidal environments. First, analysed images simultaneously acquired both two shore-based stations satellite to determine fr...

Collecting information on suspended sediments concentration (SSC) in coastal waters and estuaries is vital for proper management of coastal environments. Traditionally, SSC used to be measured by time consuming and costly point measurements. This method allows the accurate measurement of SSC only for a point in space and time. Remote sensing from air-borne and space-borne sensors have proved to...

2003
P. A. Moore

The role of sediment biogeochemistry on diffusive flux of inorganic P was examined under laboratory conditions using intact sediment cores obtained from a subtropical hypereutrophic lake. The effect of light and dark conditions in the water column on soluble P flux from sediments was measured over a period of 1 yr. Soluble reactive P (SRP) level in the overlying water column was low (<0.01 mg -...

Journal: :international journal of environmental research 2014
a. banas k. banas p. yang h.o. moser m.b.h. breese

x-ray absorption fine structure (xafs) spectroscopy was used to identify directly the metal speciation and local bonding environment of fe in sediments originated from dobczyce reservoir (poland); special attention was paid to analysis of samples collected from points situated at different distances from the land. the combination of traditional approach to data analysis as well as usage of mult...

Journal: :Marine pollution bulletin 2014
Parthasarathi Chakraborty P V Raghunadh Babu Krushna Vudamala Darwin Ramteke Kartheek Chennuri

This is the first study to describe distribution and speciation of Hg in coastal sediments from the central east coast of India. The concentrations of Hg in the studied sediments were found to be much lower than the Hg concentration recommended in coastal sediments by the United State Environmental Protection Agency and the Canadian Council of Ministers of the Environment for the protection of ...

ژورنال: علوم آب و خاک 2015
حسینی, خسرو, خیرخواهان, مهران,

Cohesive sediments have large specific surfaces which enable them to absorb other cohesive sediments and polar particles such as mud and sodium. Floccules form by joining these particles. The behavior of cohesive sediments in aquatic environments is completely different from that of granular sediments. Under certain value of shear stress, the structure formed from cohesive sediments is divided ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده علوم 1376

saluk mount is selected for devonian biostratigraphy. this area located at southwest of bojnurd. in this study three sections are selected and two sections, chahar-borj and tabar sections with a thickness of 650 m, which consist mainly of calcareous sediments was studied in detailed but third section, qelli section, with a thickness of about 450m which consist mainly of sandstone and evaporates...

Journal: :Chemosphere 2012
Stuart L Simpson Daniel Ward David Strom Dianne F Jolley

Acid-volatile sulfides (AVS) are an important metal-binding phase in sediments. For sediments that contain an excess of AVS over simultaneously extracted metal (SEM) concentrations, acute or chronic effects should not result from the metals Cd, Cu, Ni, Pb and Zn. While AVS phases may exist in surface sediments, the exposure to dissolved oxygen may oxidize the AVS and release metals to more bioa...

2017
Agnieszka Baran Marek Tarnawski Krzysztof Urbański Agnieszka Klimkowicz-Pawlas Iwona Spałek

The aims of the study were to investigate the concentration, sources and ecological risk of PAHs (polycyclic aromatic hydrocarbons) in bottom sediments collected from nine reservoirs located in south-eastern Poland. The concentration of ∑PAHs in sediments ranged from 150 to 33,900 μg kg-1. The total PAH concentration in the bottom sediments was arranged in the following order: Rybnik > Rzeszów ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید