Spatial and temporal variation characteristics of heavy rainfall in the Huaihe River Basin in recent 60 years
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Abstract:
Based on the daily precipitation data at 44 stations in the Huaihe River Basin from 1951 to 2009, we analyzed the spatial and temporal variation patterns of Precipitation Concentratio n Degree ( PCD) and Precipitation Concentration Per iod ( PCP) of rainstorm, heavy rainfall, and total precipitation in the study area using the methods such as wavelet analysis, Mann2Kendall mutation test, , and krig ing interpolation. The results showed that ( 1) the increasing trend of the rainstorm PCD and PCP is insignificant, but the amount of rainsto rm and total precipitation show a significantly increasing trend with the rate of 21 64 mm/ 10 a and 151 17 mm/ 10 a, respectively; ( 2) the periodicity of the PCD is appro ximately 5 years and 10 years, the periodicity of PCP is appro ximately 5 years and 15 years, and the periodicity of rainstorm and to tal precipitation is appr ox imately 6 to 10 y ears in r ecent 60 y ears; ( 3) there are obvious muta2 tion year s fo r the PCD, PCP, r ainstorm, and total precipitation; ( 4) t he spatial distr ibutio n of rainstorm PCD is uneven in the riv er basin with t he increasing trend fr om w est to east and from south to nor th, and the P CD is hig her in t he area w ith heav ier rainfall and hig her to tal precipitat ion; ( 5) rainstorm PCP o ccur s mo st ly in the middle t o late July , and it is pushed back from no rtheast to nort hw est w ithin a year ; and ( 6) the cor relat ion co efficient betw een the rainstorm amount and r ainst orm fr equency is up to 01 96, so they have similar ly spatia l and tempor al v ariat ions in the H uaihe River Basin.
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