نتایج جستجو برای: gas seep

تعداد نتایج: 246084  

ژورنال: :علوم آب و خاک 0
رخساره رستمیان r. rostamian جهانگیر عابدی کوپایی j. abedi koupai

به منظور بهره وری از آب در کشاورزی دانستن میزان نشت آب از کانال ها لازم است. اگرچه روابط تجربی متعددی برای تخمین میزان نشت از کانال ها به دست آمده، ولی تجربه نشان داده که ضرایب این معادلات با شرایط کشور ایران متفاوت است و از طرفی نوع روابط نیز به صورت منطقه ای تغییر می کنند. در مطالعه حاضر، توانایی مدل نرم افزاری seep برای تخمین میزان نشت آب تعدادی از کانال های خاکی زیردست سد زاینده رود بررسی ش...

2010
Jens Greinert Daniel F. McGinnis Lieven Naudts Peter Linke Marc De Batist

[1] Bubble transport of methane from shallow seep sites in the Black Sea west of the Crimea Peninsula between 70 and 112 m water depth has been studied by extrapolation of results gained through different hydroacoustic methods and direct sampling. Ship-based hydroacoustic echo sounders can locate bubble releasing seep sites very precisely and facilitate their correlation with geological or othe...

Journal: :Magnetic resonance imaging 2012
Chase R Figley Patrick W Stroman

Although event-related fMRI is able to reliably detect brief changes in brain activity and is now widely used throughout systems and cognitive neuroscience, there have been no previous reports of event-related spinal cord fMRI. This is likely attributable to the various technical challenges associated with spinal fMRI (e.g., imaging a suitable length of the cord, reducing image artifacts from t...

Journal: :Frontiers in Marine Science 2021

Cold seeps support fragile deep-sea communities of high biodiversity and are often found in areas with commercial interest. Protecting them from encroaching human impacts (bottom trawling, oil gas exploitation, climate change) requires an advanced understanding the drivers shaping their spatial distribution biodiversity. Based on analysis 2,075 high-quality images six remotely operated vehicle ...

Journal: :Geosciences 2021

The natural emission of methane-rich fluids from the seafloor, known as cold seepage, is a widespread process at modern continental margins. studies on present-day seepages provide high-resolution datasets regarding fluid plumbing system, biogeochemical processes in sediment, seafloor seepage distribution and ecosystems. However, long-term (hundreds thousands to millions years) evolution remain...

ژورنال: :مهندسی عمران و محیط زیست 2012
هادی معینی رودبالی همایون کتیبه ایرج گلابتونچی

بررسی فرار آب از مخزن بالایی دست نیروگاه تلمبه ­ذخیره­ای سد آزاد کردستان، یکی از عوامل مهم و اثر­گذار در آب­بندی مخزن است. در این تحقیق با توجه به مقدار نفوذپذیری دیواره‏ها و کف مخزن که از آزمایش­های لوژن به دست آمده، میزان نشت آب به چند روش محاسبه شده است. نتایج معادله تحلیلی ودرنیکف، روش عددی المان محدود (نرم‏افزار seep/w)، مقدار کل نشت آب از مخزن مورد نظر را در حالت جریان پایدار، به ترتیب بر...

2009
C. Hensen

Submarine mud volcanism represents an important pathway for methane from deeper reservoirs to the surface, where it enters the benthic carbon cycle. To quantify overall methane release from the Captain Arutyunov mud volcano (CAMV) and to assess the contribution of macrobenthic seep organisms to the regulation of the benthic methane flux, we linked water column methane concentrations, seabed met...

Journal: :Frontiers in Marine Science 2022

Site F is the most vigorous cold seep known on continental slope of northern South China Sea. Up to now, microbial community structures in sediments based high-throughput sequencing 16S rRNA genes have been studied extensively. However, few studies investigated at fine vertical scales and control stations outside F. In this study, a comprehensive investigation communities along depths varying f...

2015
Chrisoulla V. Rakowski Cedric Magen Samantha Bosman Kelsey L. Rogers Lauren E. Gillies Jeffrey P. Chanton Olivia U. Mason

In contrast to other oligotrophic water bodies the Gulf of Mexico (GOM) hosts an abundance of hydrocarbon seeps, which likely influences the microbial assemblages it hosts particularly regarding the availability of labile carbon in the aphotic GOM. The aphotic zone receives direct injection of seep methane (CH4), but CH4 from an unknown source has been reported at supersaturated concentrations ...

2007
Erik E. Cordes Susan L. Carney Stephane Hourdez Robert S. Carney James M. Brooks Charles R. Fisher

Quantitative collections of tubewormand mussel-associated communities were obtained from 3 cold seep sites in the deep Gulf of Mexico: in Atwater Valley at 1890m depth, in Alaminos Canyon at 2200m depth, and from the Florida Escarpment at 3300m depth. A total of 50 taxa of macroand megafauna were collected including 2 species of siboglinid tubeworms and 3 species of bathymodiolin mussels. In ge...

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