New flood protection planning based on the use of distributed rainfall runoff simulation system

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This research seeks a new methodology to establish a new flood disaster planning by using a physically based distributed rainfall runoff model and a stochastic rainfall generation model. To achieve the research purposes, radar data scale analysis required by a distributed rainfall runoff model, development of a stochastic rainfall generation model, and a rainfall prediction error analysis with the use of a translation model have been conducted. The followings are summery obtained by the research:1) Development of a stochastic rainfall generation modelA stochastic rainfall generation model by using random cascade theory has been developed. In the method, topographic effect on rainfall distribution is successfully incorporated.2) An error structure of rainfall prediction by a translation model was analyzed and the error structure has been modeled as a lognormal random field model.3) Spatial scale of radar data required by a distributed rainfall runoff model was analyzed and a relationship between required radar rainfall scale and catchment scale was clarified.4) Spatial scale of input data required by a distributed rainfall runoff model was analyzed and it was revealed that geometrical spatial information of model parameters were less sensitive for runoff simulation.