著者

関 智弥 池田 宏 SEKI Tomoya IKEDA Hiroshi

出版者

Terrestrial Environment Research Center, the University of Tsukuba

雑誌

筑波大学陸域環境研究センター報告 = Bulletin of the Terrestrial Environment Research Center,the University of Tsukuba (ISSN:13463381)

巻号頁・発行日

vol.4, pp.75-88, 2003-10

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Lake Kasumigaura is a coastal lake, the second largest lake in Japan. There is the lacustrine lowland with a width of 0.5 - 1.0km, around Lake Kasumigaura. The lacustrine lowland consists of "Terrace I", "Terrace II" and "developing Lowland". It has been known that the lacustrine lowland formed at present, however the mechanisms and processes of formation have not been well understood. Thus, in this study, geomorphic characters and mechanism of developing lowland are revealed by distributions of reed community and grain size analysis and analysis of wave energy.Developing lowland is low and flat topography, and its relative height is 0 - 0.5m from mean water level. And its structure materials are mainly fine grains especially "very fine sand" and "silt". In addition distributions of the developing lowland and reed community have close correlation. And these distributions are determined mainly by wave energy.These results lead to the conclusion that developing lowland was formed with deposition of sands by the wave and capture of fine grains by reeds.