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Kōtō-ku, Japan

Amaguchi H.,Tokyo Metroplitan University | Kawamura A.,Tokyo Metroplitan University | Olsson J.,Swedish Meteorological and Hydrological Institute | Takasaki T.,Civil Engineering Center
Journal of Hydrology

The recent advances in GIS technology as well as data availability open up new possibilities concerning urban storm runoff modeling. In this paper, a vector-based distributed storm event runoff model - the Tokyo Storm Runoff (TSR) model - is developed and tested for urban runoff analysis using two historical storm events. The set-up of this model is based on urban landscape GIS delineation that faithfully describes the complicated urban land use features in detail. The flow between single spatial elements is based on established hydraulic and hydrological models with equations that describe all aspects of storm runoff generation in an urban environment. The model was set up and evaluated for the small urban lower Ekota catchment in Tokyo Metropolis, Japan. No calibration or tuning was performed, but the general model formulation was used with standard parameter values obtained from the literature. The runoff response to two storm events were simulated; one minor event resulting only in a small-scale flood wave and one major event which inundated parts of the catchment. For both events, the simulated water levels closely reproduced the observed ones. For the major event, also the reported inundation area was well described by the model. It was also demonstrated how the model can be used to evaluate the flow conditions in specific components of the urban hydrological system, which facilitates e.g. evaluation of flood-preventive measures. © 2011 Elsevier B.V. Source

Yoshida K.,Civil Engineering Center | Masuda H.,Civil Engineering Center | Okamoto N.,Civil Engineering Center
JFE Technical Report

The main purpose of improving the seismic capacity of an existing plant facility is not only to ensure the safety of the persons working in the facility at the time of the severe earthquake. It is also aimed to maintain the functionality of the plant, enabling it to quickly restart its operation after an incident. Moreover, during the reinforcement works, it is important that plant operation is not disturbed. This paper undertakes the said considerations in the following examples: (1) LNG unloading facility (Supporting structure: steel framing); Structural steel framing is reinforced by additional steel section to withstand seismic response based on Level 2 seismic motion. (2) City gas governor station (RC building); RC framing is reinforced by additional outer structural steel framing to reduce its seismic load. (3) Waste incineration plant facility (RC building with structural steel framing for roofing and siding); Combined steel and RC framing is reinforced by additional earthquake-resistance RC wall and steel bracing respectively, to satisfy the specified criteria for existing building. Source

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