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Kazuhisa A. Chikita, Hideo Oyagi and Kazuhiro Amita
A thermal system in the very deep Lake Tazawa (maximum depth, 423 m) was investigated by estimating the heat budget. In the heat budget estimate, the net heat input at the lake?s surface and the heat input by river inflow and groundwater inflow were cons...
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Kazuhisa A. Chikita, Akio Goto, Jun Okada, Takashi Yamaguchi and Hideo Oyagi
Exploring how the hydrological and thermal conditions of a volcanic lake change in response to volcanic activity is important to identify the signs of a volcanic eruption. A water cycle system and a geothermal process in a crater lake, Okama, in the acti...
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Kazuhisa Chikita, Yasuhiro Ochiai, Hideo Oyagi and Yoshitaka Sakata
Kuttara Volcano, Hokkaido, Japan, consists of temperate Lake Kuttara and the western Noboribetsu geothermal area. In order to explore geothermal relations between Lake Kuttara and the geothermal area, the heat budget of a hydrothermal pond, Okunoyu, was ...
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Kazuhisa A. Chikita, Hideo Oyagi, Tadao Aiyama, Misao Okada, Hideyuki Sakamoto and Toshihisa Itaya
A deep temperate lake, Lake Kuttara, Hokkaido, Japan (148 m deep at maximum) was completely ice-covered every winter in the 20th century. However, ice-free conditions of the lake over winter occurred three times in the 21st century, which is probably due...
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