scholarly journals Numerical Modeling of the Effects of Toe Configuration on Throughflow in Rockfill Dams

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1726
Author(s):  
Nils Solheim Smith ◽  
Ganesh H. R. Ravindra ◽  
Fjóla Guðrún Sigtryggsdóttir

The rockfill toe structure situated within the downstream slope of rockfill dams is an integral part of a defense mechanism safeguarding the dam structure in throughflow situations. Recent studies have concluded that the rockfill toe structure can have significant impacts on throughflow development and stability of rockfill dams under scenarios of accidental throughflow caused by overtopping of the dam core. The ability to numerically model the effect of various toe configurations on flow through rockfill dams can support the design of effective toe drainage structures for rockfill dams. Development and calibration of a reliable numerical modeling tool in this regard has been challenging owing to lack of availability of extensive datasets from physical modeling investigations. This study further employs datasets gathered by a recent physical modeling study investigating the effects of various toe configurations on throughflow development in rockfill dam models. A commercial numerical seepage modeling tool with an option for non-Darcy flow was calibrated against the datasets with good calibration metrics. The study is novel in providing a rare report on the usage of this option. The calibrated tool can further be employed to carry out a wide array of simulations to arrive at an ideal design for a toe structure for rockfill dams and for assessment of hydraulic performance of toe structures.

Author(s):  
Piotr Michura ◽  
◽  
Stan Ruecker ◽  
Celso Scaletsky ◽  
Guilherme Meyer ◽  
...  

1956 ◽  
Vol 184 (2) ◽  
pp. 296-300 ◽  
Author(s):  
László Kátó ◽  
Béla Gözsy

Experiments are presented to the effect that in an inflammatory process histamine and leucotaxin appear successively at different and orderly time intervals, thus assuring an increased fluid flow through the capillary wall. Histamine is released not only in the inflammatory process but also by intradermal administration of such substances (volatile oils or their components) which induce neither the triple response of Th. Lewis nor any tissue damage. This could be explained by the fact that in the tissues histamine is ‘present’ but leucotaxin is ‘formed.’


2016 ◽  
Vol 52 (3) ◽  
pp. 1591-1606 ◽  
Author(s):  
Ylva Sjöberg ◽  
Ethan Coon ◽  
A. Britta K. Sannel ◽  
Romain Pannetier ◽  
Dylan Harp ◽  
...  

Author(s):  
Ahmad Shafee ◽  
M. Sheikholeslami ◽  
M. Jafaryar ◽  
Fatih Selimefendigil ◽  
M. M. Bhatti ◽  
...  

2003 ◽  
Author(s):  
Gerrit Blacquière ◽  
Edith van Veldhuizen

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