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| Spatial-temporal varieities of rainfall erosivity in the Liaohe River Basin |
| Li Liangdong1,Gao Peng1,2,Mu Xingmin1,2,Mo Li2,3 |
1.Institute of Soil and Water Conservation,Chinese Academy of Sciences,Ministry of Water Resources,712100,Yangling,Shaanxi;2.Northwest A & F
University,712100,Yangling,Shaanxi;3.Guangxi T-Energy Engineering Consulting Co.Ltd.,530023,Nanning,Guangxi: China |
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Abstract Rainfall erosivity is an index of erosion ability of rainfall.With the daily rainfall data of ten meteorological sites in Liaohe River Basin,we estimated the rainfall erosivity and analyzed the spatial and temporal variability in the Liaohe River Basin by using the daily rainfall erosivity model.The results showed that the spatial characteristic of rainfall erosivity is consistent with the spatial distribution of rainfall,declining from southeast to northwest and varying from 1 000 to 3 800 MJ·mm/(hm2·h·a).The season distribution of rainfall erosivity is centralized and that in June,July,Augest occupy 80% of the whole year.The inter-annual variation is large,and Cv is between 0.367 and 0.649,but the result of Mann-Kendall test showed there is no significant trends of variation.Especially,in the basin of West-Liaohe River Basin where the soil erosionis most serious,the rainfall erosivity is comparatively low,although the rainfall erosivity is more concerted and varies much more between years.
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Received: 05 June 2008
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