| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Research Abstract |
Firstly, the grid size effect was investigated using Distributed Hydrological Model. In general, grid-based distributed hydrological models are considered to be a very effective flood modeling tool for basin-wide flood risk analysis due to their capabilities of simulating river and surface inundations at high spatio-temporal resolutions by taking advantages of grid-based data from meteorological models, radar and satellite remote sensing. Selecting an appropriate grid size is critically important for any application of a grid-based model, which requires proper understanding of effects of grid sizes on simulated outcomes. The paper presents the outcomes of a study conducted to analyze the effects of grid resolution in simulated river peak flows and surface inundation in two selected river basins using a process-based distributed hydrological model.
The effect of integration of river model and estuary model was evaluated to demonstrate the benefit of an integrated estuary model. An integr
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ated estuary model consists of hydrological model, estuary model and meteorological model. In general, salinity distribution may be found to be significant for the evaluation of long time scale water quality in an enclosed bay because salinity mainly controls density in a bay. Therefore, the influence of tide on salinity in a bay was investigated to demonstrate the necessity of an integrated estuary model. Two different river discharges and three different tidal amplitudes were used to examine the influence of tidal effect on salinity flux at the mouth of river. It was revealed that, for the case where river discharge at the upstream end of river model is constant and river discharge due to tide is included, with increasing reduction of average salinity from initial conditions, the river discharge at the upstream end was smaller than river discharge due to tide. The integration of river model, which can include the feature of estuary, and estuary model is, thus, found to be important to evaluate salinity flux at the mouth of river accurately. Less
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