scholarly journals Ad-hoc principles of “minimum energy expenditure” as corollaries of the constructal law The cases of river basins and human vascular systems

2016 ◽  
Vol 34 (S1) ◽  
pp. S147-S150 ◽  
Author(s):  
A. Heitor Reis
Keyword(s):  
Energy Expenditure ◽  
Ad Hoc ◽  
Minimum Energy ◽  
River Basins ◽  
Constructal Law ◽  
Minimum Energy Expenditure

scholarly journals Transferring the concept of minimum energy expenditure from river networks to subsurface flow patterns

2014 ◽  
Vol 11 (6) ◽  
pp. 5831-5857
Author(s):  
S. Hergarten ◽  
G. Winker ◽  
S. Birk
Keyword(s):  
Energy Expenditure ◽  
Power Law ◽  
Preferential Flow ◽  
Minimum Energy ◽  
Subsurface Flow ◽  
Flow Patterns ◽  
River Networks ◽  
Data Sets ◽  
Residence Times ◽  
Minimum Energy Expenditure

Abstract. Principles of optimality provide an interesting alternative to modeling hydrological processes in detail on small scales. However, the concepts still seem to be on a visionary level except for the theory of minimum energy expenditure for river networks. Inspired by this approach, we present a theory of minimum energy expenditure in subsurface flow in order to obtain a better understanding of preferential flow patterns in the subsurface. The concept describes flow patterns which are optimal in the sense that they minimize the total energy expenditure at given recharge under the side condition of a given total porosity. Results are illustrated using two examples: two-dimensional flow towards a spring with a radial symmetric distribution of the porosity and dendritic flow patterns. The latter are found to be similar to river networks in their structure and, as a main result, the model predicts a power-law distribution of the spring discharges. In combination with two data sets from the Austrian Alps, this result is used for validating the model. Both data sets reveal power-law distributed spring discharges with similar scaling exponents. These are, however, slightly larger than the exponent predicted by the model. As a further result, the distributions of the residence times strongly differ between homogeneous porous media and optimized flow patterns, while the mean residence times seem to be similar in both cases.

scholarly journals The Minimum Energy Expenditure Shortest Path Method

2013 ◽  
Vol 17 (1-2) ◽  
pp. 31-44 ◽  
Author(s):  
Christos Mousas ◽  
Paul Newbury ◽  
Christos-Nikolaos Anagnostopoulos
Keyword(s):  
Energy Expenditure ◽  
Shortest Path ◽  
Minimum Energy ◽  
Minimum Energy Expenditure

scholarly journals Abstract ACO-EEAODR: An Ant-Swarm Inspired Energy-Efficient Ad Hoc On-Demand Routing Protocol for Mobile Ad Hoc Networks

2021 ◽  
Author(s):  
Waqas Shah
Keyword(s):  
Network Lifetime ◽  
Routing Protocol ◽  
Energy Efficient ◽  
Ad Hoc ◽  
Performance Metrics ◽  
Minimum Energy ◽  
Sustainable Growth ◽  
Energy Aware ◽  
On Demand ◽  
Demand Routing

As the world’s economic activities are expanding, the energy comes to the fore to the question of the sustainable growth in all technological areas, including wireless mobile networking. Energyaware routing schemes for wireless networks have spurred a great deal of recent research towards achieving this goal. Recently, an energy-aware routing protocol for MANETs (so-called energy-efficient ad hoc on-demand routing protocol (EEAODR) for MANETs was proposed, in which the energy load among nodes is balanced so that a minimum energy level is maintained and the resulting network lifetime is increased. In this paper, an Ant Colony Optimization (ACO) inspired approach to EEAODR (ACO-EEAODR) is proposed. To the best of our knowledge, no attempts have been made so far in this direction. Simulation results are provided, demonstrating that the ACO-EEAODR outperforms the EEAODR scheme in terms of energy consumed and network lifetime, chosen as performance metrics.

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