|
|
|
| Estimation of monthly rainfall erosivity based on rainfall amount and rainfall time: A case study in hilly and gully area of Loess Plateau in Northern Shaanxi |
| Zhao Wenwu1,2,Zhu Jing2,Guo Wenwen2 |
| 1.Key Laboratory of Land Use,Ministry of Land and Resources,100035;2.State Key Laboratory of Earth Surface Processes and Resource Ecology,College of Resources Science and Technology,Beijing Normal University,100875: Beijing,China |
|
|
|
|
Abstract The simple algorithm of rainfall erosivity is important for USLE/RULSE to evaluate soil erosion in large scale.In this article,the models of monthly rainfall erosivity were built up based on rainfall amount and rainfall time and used to a case study in hilly and gully area of Loess Plateau in Northern Shannxi.The results indicates that the R2 of model decrease generally when independent variables changes from P9(monthly rainfall for days with daily rainfall greater than or equal to 9.0 mm) to Pm(monthly rainfall).The R2 of models with ΣEI10 as dependent variable are almost equal to that with ΣEI30 as dependent variable,and the fitting goodness of models with ΣE60I10 as dependent variable are little lower.Considered the scale effects,the R2 of models for flood season are lower than that for some month;and the R2 of models for a region are lower than that for some watershed.If these models are applied,the models with ΣEI30 as dependent variables should be chosen to evaluate soil erosion in the area.
|
|
Received: 03 June 2007
|
|
|
|
|
|
|
