2019 Volume 32 Issue 6 Pages 301-317
Although the flow duration curve is important for hydropower development, observations of streamflow regime require considerable expenditures of cost and time. The stochastic flow regime prediction method is known to allow development of flow duration curves through use of limited observational data. Therefore, this method was applied to 30 basins in Japan. We validated it quantitatively. This method necessitates recession flow parameters, which were obtained in two ways: geomorphic recession flow model (GRFM) and geological recession approach (GRA). Results demonstrated that the flow duration curve fitted better for applying GRFM than GRA. This finding corresponded to the result found for the expressive ability for basin characteristics between GRFM and GRA. Actually, the basin gradients were steep because the basins were located in mountainous areas, which was consistent with the condition derived for GRFM. When applying GRA, we observed overestimation at the low flow regime. To mitigate this error, we recommend using water-storage consisting of baseflow component.
