Abstract
To enhance the flexibility of the "Cell based Distributed Rainfall-runoff Model Ver.3.0 (cdrmv3.0)", it is essential to verify how spatial information integrated into this model affects the accuracy of hydrologic analysis and also to develop the determination method for analytical parameters, such as physical properties of forestal soil and land use information derived from satellite analysis.
In this study, two spatial resolution models (with 50m for Landsat / ETM+ data set and 250m for Terra / MODIS data set) were applied for the flood runoff analysis at the Karikawa basin, Kanagawa Prefecture. We assess that the analytical method using two spatial models can improve the forecast accuracy of peak discharge as compared with previous ones. The following results were obtained: 1) Two satellite data set used in this study are the most suitable tools to have a timely grasp of various spatial information which can control the accuracy of flood forecasting, 2) Compute loading on 250m mesh model was noticeably lighter than 50m model, 3) The advantage of time resolution of Terra / MODIS data can derive the land cover change frequently, and also this advantage can be applied timely for simulation of the change of flood runoff pattern caused by forest fires or other natural disasters.
