نتایج جستجو برای: sediment injection

تعداد نتایج: 194023  

2017
Dongfeng Xie Cunhong Pan Xiuguang Wu Shu Gao Zhengbing Wang

The research objective is to investigate the variations of sediment transport in outer Changjiang Estuary and adjacent Hangzhou Bay, induced by the decline of Changjiang River sediment discharge and massive land reclamation in the last three decades. A synchronous hydrographic survey was conducted along two transects (at the bay-mouth and outer Changjiang Estuary, respectively) during the sprin...

2004
Tian-Jian Hsu Philip L.-F. Liu

[1] We present two depthand phase-resolving models, based on singleand two-phase approaches for suspended sediment transport under water waves. Both models are the extension of a wave hydrodynamic model Cornell Breaking Wave and Structure (COBRAS). In the two-phase approach, dilute two-phase mass and momentum equations are calculated along with a fluid turbulence closure based on balance equati...

2015
Hongwei Fang Mehdi Fazeli Wei Cheng Lei Huang Hongying Hu Yanguang Chen

Cohesive sediment deposits in the Three Gorges Reservoir, China, were used to investigate physical and geochemical properties, biofilm mass, and erosion and deposition characteristics. Biofilm cultivation was performed in a recirculating flume for three different periods (5, 10 and 15 days) under ambient temperature and with sufficient nutrients supply. Three groups of size-fractionated sedimen...

Journal: :Applied and environmental microbiology 2010
Erick Cardenas Wei-Min Wu Mary Beth Leigh Jack Carley Sue Carroll Terry Gentry Jian Luo David Watson Baohua Gu Matthew Ginder-Vogel Peter K Kitanidis Philip M Jardine Jizhong Zhou Craig S Criddle Terence L Marsh James M Tiedje

Massively parallel sequencing has provided a more affordable and high-throughput method to study microbial communities, although it has mostly been used in an exploratory fashion. We combined pyrosequencing with a strict indicator species statistical analysis to test if bacteria specifically responded to ethanol injection that successfully promoted dissimilatory uranium(VI) reduction in the sub...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2008
David S Goldberg Taro Takahashi Angela L Slagle

Developing a method for secure sequestration of anthropogenic carbon dioxide in geological formations is one of our most pressing global scientific problems. Injection into deep-sea basalt formations provides unique and significant advantages over other potential geological storage options, including (i) vast reservoir capacities sufficient to accommodate centuries-long U.S. production of fossi...

Journal: :Continental shelf research 2007
David K Ralston Mark T Stacey

Field observations of flow and sediment transport in a tributary channel through intertidal mudflats indicate that suspended sediment was closely linked to advection and dispersion of a tidal salinity front. During calm weather when tidal forcing was dominant, high concentrations of suspended sediment advected up the mudflat channel in the narrow region between salty water from San Francisco Ba...

2017
Hong Wang Tongzhou Liu Shuai Feng Weihua Zhang

In ex-situ washing, HCl, EDTA and H2O2 solutions can effectively extract heavy metals in river sediment. Nevertheless they often target different sediment components, possibly transforming metal species into more bioavailable and hence toxic ones. This study, in batch settings, investigated the influences of different types of washing agents (i.e. HCl, EDTA and H2O2) on metal (i.e. Cu and Zn) r...

2008
Robert G. Hatfield Barbara A. Maher

Accelerated erosion and transport of fine sediment from upland temperate catchments can reflect increased erosivity and/or erodibility, due in turn to climatic and/or human forcing. Identification of sediment fluxes and sources over Holocene timescales can both enable understanding of the relative impacts of these forcings, and provide perspective on recent sediment fluxes. Here we present a ~ ...

2013

The U.S. Environmental Protection Agency (EPA) Engineering Issue papers are a series of documents that summarize the available information on specific contaminants, selected treatment and site remediation technologies, and related issues. This Engineering Issue paper is intended to provide remedial project managers (RPMs), on-scene coordinators (OSCs), contractors, and other state or private re...

2016
Maria Lagerström Matz Norling Britta Eklund

The application of a field portable X-ray fluorescence spectrometer (FPXRF) to measure Cu, Zn, and Pb in soil and sediments at recreational boatyards by Lake Mälaren in Sweden was investigated. Confirmatory chemical analysis on freeze-dried samples shows that, ex situ, the FPXRF produces definitive level data for Cu and Zn and quantitative screening data for Pb, according to USEPA criteria for ...

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