scholarly journals A Foundation for Modeling Time-Periodic Groundwater Flow

Eos ◽  
2017 ◽  
Vol 98 ◽  
Author(s):  
Joe Depner ◽  
Todd Rasmussen
Keyword(s):  
Groundwater Flow ◽  
Theoretical Foundation ◽  
Groundwater Hydraulics ◽  
Time Periodic

The authors of a new book on groundwater hydraulics and hydrology describe a theoretical foundation for modeling time-periodic groundwater flow.

Hydrodynamics of Time-Periodic Groundwater Flow

2016 ◽  
Author(s):  
Joe S. Depner ◽  
Todd C. Rasmussen
Keyword(s):  
Groundwater Flow ◽  
Time Periodic

scholarly journals On the convective nature of roll waves instability

2005 ◽  
Vol 2005 (3) ◽  
pp. 259-271 ◽  
Author(s):  
C. Di Cristo ◽  
A. Vacca
Keyword(s):  
Flow Model ◽  
Theoretical Foundation ◽  
Wave Number ◽  
Branch Points ◽  
Periodic Disturbance ◽  
One Dimensional ◽  
Dimensional Flow ◽  
Roll Waves ◽  
The One ◽  
Time Periodic

A theoretical analysis of the Saint-Venant one-dimensional flow model is performed in order to define the nature of its instability. Following the Brigg criterion, the investigation is carried out by examining the branch points singularities of dispersion relation in the complexωandkplanes, whereωandkare the complex pulsation and wave number of the disturbance, respectively. The nature of the linearly unstable conditions of flow is shown to be of convective type, independently of the Froude number value. Starting from this result a linear spatial stability analysis of the one-dimensional flow model is performed, in terms of time asymptotic response to a pointwise time periodic disturbance. The study reveals an influence of the disturbance frequency on the perturbation spatial growth rate, which constitutes the theoretical foundation of semiempirical criteria commonly employed for predicting roll waves occurrence.

Numerical modeling of regional groundwater flow in the Adda-Ticino Basin: advances and new results

2016 ◽  
Vol 41 ◽  
pp. 10-13 ◽  
Author(s):  
Luca Alberti ◽  
Martino Cantone ◽  
Silvia Lombi ◽  
Alessandra Piana
Keyword(s):  
Numerical Modeling ◽  
Groundwater Flow ◽  
Regional Groundwater

Corporate Governance and Performance of Organizations

2018 ◽  
Vol 9 (5) ◽  
pp. 439-446
Author(s):  
Hamid Ait lemqeddem ◽  
◽  
Mounya Tomas ◽  
Keyword(s):  
Corporate Governance ◽  
Agency Theory ◽  
Theoretical Foundation ◽  
Quantitative Approach ◽  
Governance Practices ◽  
Deductive Method ◽  
Private And Public ◽  
Is Theory ◽  
And Performance ◽  
Do So

There is renewed interest in the need to focus on corporate governance in an environment where it is a performance imperative for all small and large organizations, private and public, beginner or established.The purpose of this study is to demonstrate the place of corporate governance practices in organizations to ensure that the board, officers, and directors take action to protect shareholder interests and all stakeholders. It is important to focus on the effect of these practices on improving performance and competitiveness. To do so, we opted for the hypothetico-deductive method with a quantitative approach. Our theoretical foundation is theory is agency theory.

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