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Capability and limitations in laboratory determination of stiffness parameters of soils

100%

Lipinski M. J., Wdowska M. K.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2015

tom 47

nr 2

Capability and limitations in laboratory determination of stiffness parameters of soils. The paper concerns laboratory methods for determination of soil stiffness. Major criterion for selection of analysed equipment is range of strain in which stiffness can be reliably determined. Substantially, various confi gurations of triaxial apparatus are referred to i.e. with standard cell and with the modifi ed one. Additional system for internal measurement of strain is described and rational (based on test results) for use of it is presented. As to shear wave velocity measurement as a mean to obtain initial stiffness, requirements for proper measurement and interpretation was given. Finally, an approach to determine Poisson’s ratio on the basis of combined results of cyclic triaxial and resonant column tests was presented.

Laboratory determination of potential interception of young deciduous trees during low-intense precipitation

72%

Klamerus-Iwan A., Sporysz M.

Folia Forestalia Polonica. Series A . Forestry

2014

tom 56

nr 1

The research issue focuses on potential interception, which is the maximum amount of water that can be stored on plant surface. Tests under controlled conditions remain the best way to enhance knowledge on interception determinants in forest communities. Such tests can provide data for identification of mathematical models based on ecological criteria. The study presented in this paper concerned tree interception under simulated rain in a range from 2 to 11 mm/h. To perform the experiment a set of sprinklers was designed and built. The study included two deciduous species: beech (Fagus sylvatica L.) and oak (Quercus robur L.). Descriptive characteristic and nonlinear estimation were suggested for the obtained data. Interdependence of potential interception, the intensity of rain and the size of raindrops were described using exponential equation. The intensity and drop size of simulated rainfall significantly influence the obtained values of potential interception. Data analysis shows a decrease of interception value with an increase of intensity of simulated rainfall for both analysed species. Every run of the experiment that differed in the intensity and size of raindrops reached an individual level of potential interception and time needed to realize it. The formation of ability of plants to intercept water depends both on the dynamics and the time of spraying.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 Folia Forestalia Polonica. Series A . Forestry

1 Klamerus-Iwan A.

1 Lipinski M. J.

1 Sporysz M.

1 Wdowska M. K.

1 2015

1 2014

Wyniki wyszukiwania

Capability and limitations in laboratory determination of stiffness parameters of soils

Laboratory determination of potential interception of young deciduous trees during low-intense precipitation