VARIATIONS IN WATER AND SEDIMENT DISCHARGES OF MEDIAM AND SMALL RIVERS AND THEIR RESPONSE TO HUMAN ACTIVITIES: A CASE STUDY ON THE LUAN RIVER

This paper addresses the change in runoff and sediment fluxes through the Luan River into the sea based on the record at the Luanxian Hydrological Station for the period from 1958 to 2008. The Mann-Kendall statistic test was used to estimate the long-term trends of the runoff and sediment input with time. The results show that there is a sharp change in both annual runoff and sediment fluxes in the year of 1980. The change points are highly related to human activities in the Luan River basin. It means that the change points may indicate man-made events.