scholarly journals Numerical simulation of perimeter drainage system considering peat water permeability change over time

2020 ◽  
Vol 945 ◽  
pp. 012070
Author(s):  
A V Nikitin ◽  
O M Zaborskaya
Keyword(s):  
Numerical Simulation ◽  
Water Permeability ◽  
Drainage System ◽  
Permeability Change ◽  
Change Over Time ◽  
Over Time

scholarly journals The drainage system performance in peat soil with permeability reduction

2019 ◽  
Vol 91 ◽  
pp. 07013
Author(s):  
Andrey Nikitin ◽  
Olga Zaborskaya
Keyword(s):  
Water Permeability ◽  
Peat Soil ◽  
Drainage System ◽  
Operating Experience ◽  
Size Composition ◽  
Normal Operation ◽  
Filling Material ◽  
Permeability Reduction ◽  
Drainage Systems ◽  
Over Time

Construction in waterlogged areas requires special design solutions and expensive site preparation works. Operating experience shows that the efficiency of drainage systems in peat soil decreases over time. This article describes factors to be taken into account when designing drainage systems in peat soil. It also summarizes the results of the laboratory surveys for peat and filling material permeability reduction over time. We used a laboratory box to study water permeability over time. In the experiment, we used poorly decomposed peat of natural structure and compacted peat. The study found that the water inflow into the drainage system decreased 1.5 to 1.7 times in the course of filtration. The greatest peat permeability reduction was recorded at the initial stage. The article demonstrates how the grain-size composition of sand used as backfilling affects its water permeability. In order to ensure normal operation of drainage systems in peat soil, one must consider the reduction of peat water permeability over time and clogging of sand filling when designing the said systems.

Relations Between OQ Change Over Time and Counseling Outcomes

2009 ◽  
Author(s):  
Brian Garbarini ◽  
Hung-Bin Sheu ◽  
Dana Weber
Keyword(s):  
Change Over Time ◽  
Counseling Outcomes ◽  
Over Time

CCAPS' Sensitivity to Change Over Time

2010 ◽  
Author(s):  
Sam Nordberg ◽  
Louis G. Castonguay ◽  
Benjamin Locke
Keyword(s):  
Sensitivity To Change ◽  
Change Over Time ◽  
Over Time

The cost of homelessness: Assessing change over time

2003 ◽  
Author(s):  
M. Spano ◽  
P. Toro ◽  
M. Goldstein
Keyword(s):  
Change Over Time ◽  
The Cost ◽  
Over Time

Rethinking social remittances and the migration-development nexus from the perspective of time

2013 ◽  
Vol 10 (1) ◽  
pp. 11-22 ◽  
Author(s):  
Peggy Levitt ◽  
Deepak Lamba-Nieves
Keyword(s):  
Social Influence ◽  
Change Over Time ◽  
Social Remittances ◽  
The Relationship ◽  
Migration And Development ◽  
Over Time

This article explores how the conceptualization, management, and measurement of time affect the migration-development nexus. We focus on how social remittances transform the meaning and worth of time, thereby changing how these ideas and practices are accepted and valued and recalibrating the relationship between migration and development. Our data reveal the need to pay closer attention to how migration’s impacts shift over time in response to its changing significance, rhythms, and horizons. How does migrants’ social influence affect and change the needs, values, and mind-frames of non-migrants? How do the ways in which social remittances are constructed, perceived, and accepted change over time for their senders and receivers?

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