Comparative Analysis of the Responses of Rainstorm Flood and Sediment Yield to Vegetation Rehabilitation in the Yanhe River Basin
Yanhe River Basin suffered from rainstorm events in July 1977 and 2013.However,the disasters showed different features due to the changes of underlying surface condition.This paper investigated the amount,intensity and frequency of these two rainstorm events and analyzed their relations with the runoff and sediment variations in the Yanhe River Basin.The results showed that the amount,intensity,frequency of the rainstorm in 2013 were all higher than those in 1977.However,the maximal daily runoff,maximal daily sediment,maximal daily sediment concentration,peak runoff discharge,peak sediment discharge and the duration of high sediment concentration in 2013 were all lower than those in 1977.The disasters in July 2013 were mainly caused by landslide and debris flow,while the disasters in July 1977 were mainly caused by flood.Large-scale vegetation rehabilitation in the Yanhe River Basin after the launch of "Grain for Green" program,which has changed the processes of runoff sediment,was the main reason of the different results of the disasters.
rainstormvegetation rehabilitationrunoffsedimentgravitational erosionYanhe River Basin
NETL
NSTL
万方数据
维普
