Abstract
When designing and installing the geomembrane liners made of HDPE, it is especially necessary to consider elongation or stress of the material produced by the change of temperature because of larger thermal expansion coefficient and Young's modulus of the material.
The author has measured solar absorption of black, white and green HDPE geomembrane liners by means of a spectrophotometer to identify effect of solar radiation intensity on the surface temperature of individual liners. Further the relationship between open air temperature and the surface temperature has been discussed.
Then highest surface temperature of the geomembrane liners in various locations in Japan has been surveyed from the data published by the Meteorological Agency, Japan.
As the results, the following conclusions are obtained.
1. It is the white geomembrane whose surface temperature is least affected by the solar radiation
2. No correlation can be found between the solar radiation intensity and air temperature.
When designing and installing the liners, it is possible to estimate the surface temperature of the liner based only on the solar radiation and air temperature at the construction site if such data are available.
Use of the white geomembrane is able to minimise the rise of surface temperature of the liner, which may result in updating the construction quality of installation of the liner.
