نتایج جستجو برای: sediment injection

تعداد نتایج: 194023  

Journal: :The Science of the total environment 2017
Xiaoguang Ouyang Shing Yip Lee Rod M Connolly

Mangroves are blue carbon ecosystems that sequester significant carbon but release CO2, and to a lesser extent CH4, from the sediment through oxidation of organic carbon or from overlying water when flooded. Previous studies, e.g. Leopold et al. (2015), have investigated sediment organic carbon (SOC) content and CO2 flux separately, but could not provide a holistic perspective for both componen...

2017
Jing He Derong Su Shihai Lv Zhaoyan Diao Jingjie Xie Yan Luo

Rising temperature causes a process of phosphorus release, which can be characterized well using phosphorus release rates (VP). The objective of the present study was to investigate the major factors affecting sediment phosphorus release rates through a wetland habitat simulation experiment. The results showed that the VP of different wetland sediments were different and changed with the order ...

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...

ژورنال: مهندسی دریا 2013

In this article, sediment processes and shoreline changes at Lengeh and Kong ports coastline are investigated. Comprehensive studies on effective parameters on sediment processes have been performed and coastal sediment transport rate in the area is estimated. For this purpose a conceptual model has been envisaged and the empirical and numerical models, calibrated and validated based on the con...

Journal: :E3S web of conferences 2022

Water Injection Dredging (WID) has been successfully applied for removing sediment deposits in reservoirs, which results an increase of their storage capacity. This dredging method is based on the fluidization top layer by pressurized injection water a vessel. The fluidized can be transported towards dead reservoir or sluiced out through bottom outlets dam. flow either occur gravity induced esp...

2016
Emmanuel Wafo Lydia Abou Alain Nicolay Pierre Boissery Thierry Perez Rose Ngono Abondo Cédric Garnier Mama Chacha Henri Portugal

This study evaluated the distribution of polychlorinated biphenyls (PCBs) in 39 surface sediment samples and four cores collected in Toulon Bay, a semiclosed area submitted to various anthropogenic inputs. The concentration of PCBs in the superficial sediment samples ranged from 1.7 to 2530 ng g(-1) dry weight. The spatial distribution of these compounds suggested that the high concentrations o...

2015
Randy L. Luciano Mark A. Perazella

Urine microscopy is an integral part of the clinical evaluation of patients presenting with kidney disease [1, 2]. Along with history and physical examination, directed serum tests, dipstick urinalysis, and at times, renal imaging, urine sediment examination provides an informative view into the kidney. Identification and quantification of the cells, casts and crystals present in the spun urine...

Journal: :Marine pollution bulletin 2015
Vahab Vaezzadeh Mohamad Pauzi Zakaria Aileen Tan Shau-Hwai Zelina Zaiton Ibrahim Shuhaimi Mustafa Fatemeh Abootalebi-Jahromi Najat Masood Sami Mohsen Magam Sadeq Abdullah Abdo Alkhadher

Peninsular Malaysia has gone through fast development during recent decades resulting in the release of large amounts of petroleum and its products into the environment. Aliphatic hydrocarbons are one of the major components of petroleum. Surface sediment samples were collected from five rivers along the west coast of Peninsular Malaysia and analyzed for aliphatic hydrocarbons. The total concen...

Journal: :Environmental research 2007
David H Schoellhamer Thomas E Mumley Jon E Leatherbarrow

Water-quality managers desire information on the temporal and spatial variability of contaminant concentrations and the magnitudes of watershed and bed-sediment loads in San Francisco Bay. To help provide this information, the Regional Monitoring Program for Trace Substances in the San Francisco Estuary (RMP) takes advantage of the association of many contaminants with sediment particles by con...

2010
Dallas L. Peck

Data were collected at two small, semiarid basins in Wyoming to determine the relation between rainfall, runoff, and sediment production. The basins were Dugout Creek tributary and Saint Marys Ditch tributary. Sufficient rainfall and runoff data were collected at Dugout Creek tributary to determine the source of sediment and the dominant sediment-production processes. Because runoff from only o...

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