1998 Volume 42 Pages 307-312
It is important that it makes clear cyclic process of water and water balance in urban river. But, the process of water cycle and water balance have not been made clear in the hydrologic system, because many factors are each other influenced complicatedly and that it is not elucidated in real basin.
In this study, we attempt to clarity the process of water cycle in a watershed of the Ishikawa river with a discharge area of 220 km2 by environmental isotope tracers. Both geochemical data which are EC, δ18 O etc. and river discharge are directly measured at many points.
As result, it is obvious that cyclic process of river water and water balance are grasped through geochemical data and field observation from macroscopic point.
