An Analysis of Two-Dimensional Steady Seepage Flow of Earth Dam Based on FEM

2012 ◽  
Vol 446-449 ◽  
pp. 2699-2702
Author(s):  
Chang Chun Wu
Keyword(s):  
Flow Model ◽  
Seepage Flow ◽  
Earth Dam ◽  
Two Dimensional ◽  
The Earth ◽  
Dimensional Finite Element ◽  
Multi Media ◽  
Steady Seepage ◽  
Complex Boundaries ◽  
Set Up

Through project examples, this paper set up a two-dimensional finite element seepage flow model with the help of the Auto-BANK software, to solve the soakage line overflow points, seepage quantity and seepage gradient of the earth dam based on the basic equation of steady seepage flow of earth dam and definite conditions. It is found that this method can effectively calculate and analyse multi-media seepage flow field with complex boundaries.

Orientation of the X-line in asymmetric magnetic reconnection

2016 ◽  
Vol 82 (4) ◽  
Author(s):  
N. Aunai ◽  
M. Hesse ◽  
B. Lavraud ◽  
J. Dargent ◽  
R. Smets
Keyword(s):  
Magnetic Reconnection ◽  
Domain Size ◽  
Shear Angle ◽  
Two Dimensional ◽  
Field Profile ◽  
Reconnection Rate ◽  
Magnetic Shear ◽  
Magnetic Field Profile ◽  
The Earth ◽  
Set Up

Magnetic reconnection can occur in current sheets separating magnetic fields sheared by any angle and of arbitrarily different amplitudes. In such asymmetric and non-coplanar systems, it is not yet understood what the orientation of the X-line will be. Studying how this orientation is determined locally by the reconnection process is important to understand systems such as the Earth magnetopause, where reconnection occurs in regions with large differences in upstream plasma and field properties. This study aims at determining what the local X-line orientation is for different upstream magnetic shear angles in an asymmetric set-up relevant to the Earth’s magnetopause. We use two-dimensional hybrid simulations and vary the simulation plane orientation with regard to the fixed magnetic field profile and search for the plane maximizing the reconnection rate. We find that the plane defined by the bisector of upstream fields maximizes the reconnection rate and this appears not to depend on the magnetic shear angle, domain size or upstream plasma and asymmetries.

Finite Element Analysis of Unsteady Seepage Flow through the Earth Dam of Huangbizhuang Reservoir

2012 ◽  
Vol 594-597 ◽  
pp. 1892-1896
Author(s):  
Er Xia Du ◽  
Jian Heng Sun
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Seepage Flow ◽  
Earth Dam ◽  
Earth Dams ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Earth ◽  
Flow Through

The unsteady seepage through earth dams is analyzed with the finite element method in this paper.Using this method, the seepage through Huangbizhuang earth dam is calculated. Many reasonable suggestions are posed to help the management and reinforcement of Huangbizhuang reservoir earth dam.

scholarly journals APPROACH FOR FORECASTING DANGEROUS SEEPAGE AREA ON THE DAM SLOPE AFFECTED BY THE TIDE

2010 ◽  
Vol 13 (2) ◽  
pp. 23-35
Author(s):  
Duc Van Le
Keyword(s):  
Seepage Flow ◽  
Hydraulic Gradient ◽  
Tidal River ◽  
Earth Dam ◽  
Seepage Discharge ◽  
Earthen Dam ◽  
River Bank ◽  
The Earth ◽  
Tidal Water ◽  
Triangular Area

Amplitude of osillation of water table surface and hydraulic gradient under tidal effect, tend to decrease while the seepage flow enters the earthen dam. Therefore, there exists a Dangerous Seepage Triangular Area (DSTA) where hydraulic gradient obtains maximum values. Based on the continuity equation and an assumption on the transmission of seepage oscillation, this DSTA can be specified. Finite Difference Method (FDM), analytical and DSTA methods were programmed using EXCEL software for computation and evaluation of simulated results. The numerical experiments show that the error of total seepage discharge during a tidal cycle between FDM and DSTA methods is less than 1.3%; and the error of maximum hydraulic gradient is not greater than 12%. Besides, the analysis on the earth dam slope stability shows that the most dangerous seepage case occurs when the minimum tidal water level exists as well as maximum hydraulic gradient of out-seepage flow is reached. This is one of the important reasons that explain plenty of tidal river bank erosions in Mekong River Delta.

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