Abstract:

 Based on daily observed precipitations and daily measured discharges at Beibei hydrological station during 1961-2010 in the Jialingjiang River basin， temporal and spatial changes of some typical extreme precipitation indices and hydrological indices were analyzed in this research， and the potential relationships between precipitations in different regions and hydrological process at the outlet controlling station were discussed The results showed that river discharges at Beibei hydrological station had very good relationships with regional precipitations in the Jialingjiang River basin， and the changing trends of typical extreme hydrological indices were similar to the corresponding extreme precipitation indices During 1961-2010， annual precipitations in the whole basin and annual discharges at Beibei hydrological station showed decreasing trends Under this background， the extreme precipitation indices and extreme hydrological indices， which represent rainstorm events and floods respectively， were mostly decreasing At the same time， the extreme precipitation indices and extreme hydrological indices， which represent drought events and low discharges respectively， showed a certain increasing trends， especially the precipitation index representing for days having no rain in one year increased significantly in recent decades