نتایج جستجو برای: seepage

تعداد نتایج: 2915  

2006
Tao Huang John W. Rudnicki

Deeply buried groundwater, such as brine, is an important industrial raw material with high economic value. Because brine frequently exists under higher temperature and pressure, the quantitative prediction of its seepage field is very difficult. Here we study the migration of deeply buried groundwater by using a numerical simulation based on laboratory test results. In particular, we express t...

Journal: :تحقیقات آب و خاک ایران 0
خالد سلطان نژاد دانشجوی کارشناسی ارشد سازه‏های آبی، گروه آبیاری و آبادانی دانشگاه تهران علی رئیسی استبرق استادیار گروه آبیاری و آبادانی دانشگاه تهران جمال عبدالهی بیک مربی گروه آبیاری و آبادانی دانشگاه تهران محمدحسین امید استاد گروه آبیاری و آبادانی دانشگاه تهران

piping sometimes is occurred due to seepage of water in hydraulic structures. the continuty of this phenomenon decreases the safety or caused the failure of a structure. in this work, experimental tests were carried out on statically compacted natural and randomly reinforced silt sandy soil samples. the randomly reinforced samples were prepared with different lengths and percentages of an artif...

Journal: :JNW 2014
Wen Zhong Zhuoying Tan Xiaojun Wang Jin Wang Tianshou Hu

Rainfall infiltration exerts great effect on the stability of soil slopes. Based on the actual rainfall data, saturated-unsaturated seepage theory and the mechanical theory of unsaturated porous media, numerical simulations were conducted to examine the seepage field of saturatedunsaturated slope during rainfall infiltration in this paper. The influence of the coefficient with rainfall duration...

Journal: :پژوهش آب در کشاورزی 0
مجید حیدری زاده استادیار پژوهشکده حفاظت خاک و آبخیزداری. حمیدرضا سالمی استادیار مرکز تحقیقات کشاورزی و منابع طبیعی اصفهان.

estimation of seepage from water channels are necessary in evaluating water productivity in agricultural sector as affected by floodwater spreading on plains and artificial recharge of groundwater. several empirical seepage equations have been developed for this purpose. previous research results in iran have shown lots of variation in the coefficients and the empirical equations change in diff...

Relief wells are used extensively to relieve excess hydrostatic pressure in pervious foundation strata overlain by impervious top strata, conditions which often exist landward of levees and downstream of dams and hydraulic structures. Placing well outlets in below-surface trenches or collector pipes helps dry up seepage areas downstream of levees and dams. Relief wells are often used in combina...

Design of earth dams and their problems are important during construction and after it,because of their potential hazards and failure for downstream population. The dam foundation seepage control the the importance from the perspective of a major engineering project and explain the economic performance of each project is allocated. among activities that can be used to prevent piping phenomena a...

2014
Jeffrey J. Marlow Joshua A. Steele David H. Case Stephanie A. Connon Lisa A. Levin Victoria J. Orphan

*Correspondence: Jeffrey J. Marlow and Victoria J. Orphan, Division of Geological and Planetary Sciences, California Institute of Technology, MC 100-23, Pasadena, CA 91101, USA e-mail: [email protected]; [email protected] Methane seeps are among the most productive habitats along continental margins, as anaerobic methane-oxidizing euryarchaeaota and sulfur-metabolizing deltaproteobacte...

Journal: :تحقیقات آب و خاک ایران 0
مهدی یوسفی کارشناس ارشد ژئوتکنیک دانشگاه یاسوج محمد صدقی اصل استادیار گروه خاک شناسی دانشگاه یاسوج منصور پرویزی استادیار گروه مهندسی عمران دانشگاه یاسوج

so far, for an analysis of seepage under hydraulic structures much research has beenconducted in the form of numerical models. however, few field and laboratory workshave been performed to study the boiling phenomena for evaluating numerical models.throughout the present work, a laboratory model was built to simulate seepage and itscontrolling measures under sheet piles. the model consisted of ...

1999
J. T. Geller G. Su K. Pruess

We present an experimental approach for investigating the potential for bioremediation of Ž . volatile organic compounds VOCs in fractured rock vadose zones. The experimental work was performed with rock samples and indigenous microorganisms from the site of the United States Ž . Department of Energy’s Idaho National Engineering and Environmental Laboratory INEEL , located in a basalt flow basi...

2004
Murray Fredlund

Numerical models can be valuable tools in the prediction of seepage. The results can often be misleading if proper variational analysis is not performed. Measurement of the soil-water characteristic curve (SWCC) or saturated and unsaturated hydraulic conductivity information is often neglected or minimized. The modeller is therefore forced to develop a seepage model based on estimated soil prop...

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