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Nakayama, Hiromasa; Takemi, Tetsuya*
no journal, ,
The model validation of an large-eddy simulation (LES)-based computational fluid dynamics (CFD) model coupled to a numerical weather prediction (NWP) is carried out. The Joint Urban 2003 field experimental data of gas concentration released as puff and 30-minute continuous releases is used to evaluate the performance of the coupling approach. In the LES model, wind velocity and potential temperature data of the WRF are imposed at lateral boundaries. The LES results of vertical profiles of wind speed, wind direction, and potential temperature are in good agreement with the WRF data. The time-averaged concentrations of the LES are different from the experimental data at the several points especially for the puff case. However, the LES generally show reasonable performance in comparison to the experimental data through the continuous and puff release cases. It is concluded that our approach is physically reasonable.
Hatano, Nozomi*; Yoshida, Koki*; Sasao, Eiji; Kubota, Mitsuru; Adachi, Yoshiko*
no journal, ,
In Japanese Islands, the middle Miocene to Pliocene fluvial formations include aluminous clayey horizons. These formations can be a useful to reconstruct of weathering conditions. Description of paleosols and geochemical research were carried out in the middle Miocene (10-11 Ma) and the early Pliocene (3-4 Ma) sediments in central Japan in order to illuminate the weathering condition. The major elemental geochemistry shows that the Miocene sediments were supplied from severe weathered sources with CIA values of 80-94. The Pliocene sediments show the CIA values of 72-90 showing the relatively weak weathering condition. The weathering condition in the middle Miocene to Pliocene in Japanese Islands may be affected by the influence of warm water current and initiation of the Eastern Asian monsoon. The middle Miocene period is considered to have been under the intenser weathering condition than one in the early Pliocene period.
Amano, Kenji; Oyama, Takuya; Shimo, Michito*; Kumamoto, So*
no journal, ,
no abstracts in English
Watanabe, Tsuyoshi; Asamori, Koichi; Umeda, Koji*
no journal, ,
We estimated the strain released by the 2016 Kumamoto earthquakes in the co- and post-seismic periods and the strain rate in the inter-seismic period using GPS data. Moreover, based on the active fault data, we estimated geological strain rate. From the results, we found that the shear strain as much as 7.103
10
strain was released by the M7.3 earthquake and the strain released within the first about 2.5 months following the main shock was estimated to be one order of magnitude smaller than that of the co-seismic period. Furthermore, the recurrence interval was estimated to be 3100 years by comparing geological strain rate and co-seismic strain released by the main shock. These results were good agreement with the recurrence interval evaluated from the active fault data.
Onda, Yuichi*; Yoshimura, Kazuya; Taniguchi, Keisuke*; Kubo, Takaaki*; Smith, H.*; Blake, W.*; Kuramoto, Takayuki*; Sato, Takayuki*
no journal, ,
Aoki, Kazuhiro; Seshimo, Kazuyoshi; Guglielmi, Y.*; Nussbaum, C.*; Shimamoto, Toshihiko*; Ma, S.*; Yao, L.*; Kametaka, Masao*; Sakai, Toru*
no journal, ,
Seshimo, Kazuyoshi; Aoki, Kazuhiro; Tanaka, Yukumo; Niwa, Masakazu; Shimamoto, Toshihiko*; Ma, S.*; Yao, L.*; Kametaka, Masao*
no journal, ,
Torii, Tatsuo
no journal, ,
no abstracts in English