地質の異なる２つの山地森林流域における大雨時のNO_3~--N流出機構の比較検討

摘要

This study applied the solute runoff tank model to the hydrology and water quality observational data obtained from two mountainous forested basins where geological features were different in the rainfall event of the total precipitation 200mm. The Nishitani basin has sandstone and mudstone qualities, and the Nagaotani basin has the weathering granite qualities. The parameters of the model and NO_3~--N runoff load from the basins were examined, and the following findings were obtained. (1) The difference of geological features was greatly reflected in the rainfall runoff parameters. There was a difference of the parameter in 3-5 times. (2) The difference of NO_3~--N runoff parameter was only 5%. (3) It was estimated that N_3~--N runoff load almost became equal in two basins, when the same rainfall wave was given.