Temporal and spatial distribution characteristics of drought and flood considering the influence of underlying surface in Hainan Island, tropical areas of China

Most studies of temporal and spatial distribution characteristics for droughts floods analysis were conducted only from the perspective a single factor (precipitation), while ignoring impact underlying surface on formation floods. Based daily precipitation data 88 meteorological stations in Hainan Island 1970 to 2019, 30 m resolution DEM land use dataset, etc., Z index was used evaluate level drought flood Island. The results revised by spatiotemporal areas. drought- flood-prone areas divided. show that overall an obvious downward trend, present increasing trend. drought-prone throughout year are more concentrated northeast Island, mainly distributed eastern coastal before after revision compared. It can be seen trend is relatively similar revision. 7.97 2.91 times larger than revision, respectively. Finally, combining climate factors, suggestions prevention put forward.