Propagation from Meteorological to Hydrological Drought and Its Influencing Factors in the Huaihe River Basin

Understanding the propagation from meteorological to hydrological drought is crucial for monitoring and forecasting. In this study, daily precipitation streamflow data of 16 sub-catchments in Huaihe River Basin 1980 2014 are used establish a framework quantitatively reveal relationship between explore impact climate, catchment properties, human activities on propagation. The divided into three types. Type-1 indicates that one or several droughts trigger drought. occurrence probability calculated by conditional SPI SRI series varies 0.25 0.48 among all catchments. Features can be concluded as lengthening duration, amplification severity, lag onset time, reduction speed. Type-2 occurs but no occurs, which accounts 63–77% total events Type-3 without proceeding drought, caused mostly activities. ranges 0.31 0.58. Climate factors have significant effects while properties represented topographic index base flow significantly relate ratio crop land reflecting irrigation far less than index, denoting properties. Reservoirs alleviating duration severity extreme droughts, little average droughts.