1998 Volume 11 Issue 3 Pages 240-252
In order to numerically evaluate the water discharge property of the Jiulianshan river basin, we applied the hydrologic cycle model (HYCYMODEL) to the discharge response to rainfall observed in the Jiulianshan river basin. The parameters in this model were optimized by trial and error. Monthly potential transpiration rate was computed from observed air temperature, humidity, and solar radiation with Priestly-Taylor equation. The discharge response to the rainfall simulated using HYCYMODEL agreed well with the observed discharge. The estimated parameters and the result of simulation of the discharge response to the rainfall were compared with those reported for the typical Japanese temperate forest river basins. In Jiulianshan, the ratio of the impermeable area is small, and the river basin has a large capacity of water storage. As a result, it was found that the shape of hydrograph of Jiulianshan river basin is different from those of Japanese river basins, although the ratio of total base flow to the total discharge is similar to those of Japanese river basins. In Jiulianshan, the peak of discharge is smaller and the recession hydrograph is more gentle.
