Abstract
In order to explore the thermal properties of the Ariake Sea mud and to find out the affecting factors which affect these values, a portable thermal properties analyzer was used. Thermal conductivity, thermal resistivity, thermal diffusivity and volumetric heat capacity of the mud samples collected from both the tidal flat and inside the deep sea were measured in the laboratory. The thermal properties of mud collected from tidal flat showed a different trend from the mud collected from inside the sea due to the enough exposure to the sunlight and vigorous exchange of sea water in the tidal flat. Thermal conductivity of the Ariake mud was reduced 85-90% after it was oven dried and was increased up to 30% after the ignition loss test. Thermal resistivity of the Ariake mud increased dramatically after oven dried and it was less affected by the organic matter content. Thermal diffusivity was decreased 10-30% after oven dry however it increased up to 40% after the ignition loss test. The volumetric heat capacity of the Ariake mud was reduced up to 90% and increased 40% after the oven dry and ignition loss, respectively.
Highlights
The Ariake Sea is one of the best-known semiclosed shallow seas in Japan
According to Saga agricultural and forestry statistical society (SAFSS), Japan 2006, Crassostrea gigas, usually living near the surface mud, dropped from 7.99 x 105 kg in 1979 to only 1.26 x 105 kg in 1999; that of Atrina pectinata, living in the upper 0.10-0.15 m of the mud, declined from 1.34 x 107 kg in 1976 to 7.9 x kg in 1999 and the situation in the case of Sinonovacula constricta, living in the depth of 0-0.70 m of the mud, was even worse: 1.7 x kg catch in 1976 dropped to practically nil by 1992
The cause for the declination of the fishery products is the unfavorable geo-environmental condition of the Ariake Sea created by acid treatment practice for the Porphyra sp. cultivation[10, 13]
Summary
The Ariake Sea is one of the best-known semiclosed shallow seas in Japan. The vast tidal flat of the Ariake Sea, which is almost 40% of the total tidal flat area of Japan, is famous for its rich fishery products and Porphyra sp. (sea laver) cultivation. The cause for the declination of the fishery products is the unfavorable geo-environmental condition of the Ariake Sea created by acid treatment practice for the Porphyra sp. This organic acid provides ample of foods for the sulphate reducing bacteria living in the mud and increase the sulphide content in the mud. The higher sulphide content created by acid treatment practice is the main reason for the unfavorable geoenvironmental condition for the benthos in the Ariake Sea. the activities of the benthos depend strongly on the thermal environment near the sediment surface. To evaluate geo-thermal environment is important especially for the acid contaminated Ariake Sea. Thermal properties dictate the storage and movement of heat in soils and as such influence the temperature and heat flux in soils as a function of time and depth [1]
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