Abstracts for the 5th International GAME Conf.
3-5 October 2001
Aichi Trade Center
Nagoya Japan
Measurement of Soil Thermal Properties and Analysis of Thermal Regimes of Active Layer in an Alas, Eastern Siberia
H. Kiyosawa (1), N. Kobayashi (2), H. Tanaka (3), N. Kondo (4), M. Mizoguchi (4)
(1) Faculty of Bioresources, Mie University
(2) Institute for Hydrospheric-Atomospheric Sciences, Nagoya University
(3) Masterfs Program in Environmental Sciences, University of Tsukuba
(4) Department of Biological and Environmental Engineering, University of Tokyo
Soil thermal regimes in active layers are important to understand the hydrological processes in permafrost regions. We observed soil temperature variations at several spots in Ulakhan Sykkhan alas (6209f N, 13031f) near Yakutsk from October 1999 to October 2000. Furthermore we measured soil thermal properties at six pits in the alas and the adjoining taiga forest in July of 2000. Namely, after made each pit to the permafrost table, we measured thermal conductivity and volumetric heat capacity with a thermal properties meter in each 5cm interval downward. In addition, we collected 100 cm3 samples of typical soils at each pit with metallic samplers. After imported them in Japan, we measured variation of the thermal properties with soil matric potential change. The soil temperature variations obtained in the field were analyzed to derive the characteristics of heat flux in the active layer. On the soil thermal properties, conspicuous difference was found between the surface layer of the alas and that of the adjoining forest. The difference certainly comes from humus content, that is, upper wet soil in the alas abounds with humus (about 40 % weight of dry soil) to the depth of 0.1-0.6 m, while the forest soil contains only a few percent. Using these data, pedotransfer functions about thermal and hydraulic properties were constructed on the cold wetland soils. We recognized that the difference of the soil thermal properties has a notable effect on heat flux in the active layer and on the advance of the thaw depth.
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Faculty of Bioresources, Mie University | |
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Kamihama 1515, Tsu, Mie, 514-8507 | |
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