نتایج جستجو برای: gas seep
تعداد نتایج: 246084 فیلتر نتایج به سال:
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...
[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...
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...
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 ...
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...
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...
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...
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...
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 ...
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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