Water Science and Engineering 2009, 2(2) 87-97  DOI:   10.3882/j.issn.1674-2370.2009.02.010   ISSN: 1674-2370 CN: 32-1785/TV

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granite gneiss region
soil erosion
universal soil loss equation
factor value
applicability evaluation
Wen-hai ZHANG
Xing-nan ZHANG
Zhi-dong GAO
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Factor value determination and applicability evaluation of universal soil loss equation in granite gneiss region

Wen-hai ZHANG*1, Xing-nan ZHANG1, Zhi-dong GAO2

1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. China
2. Soil Conservation Experimental Station of Jiagu Mountain, Ganyu County, Jiangsu Province, Lianyungang 222100, P. R. China


Six types of runoff plots were set up and an experimental study was carried out to examine natural rate of soil and water loss in the granite gneiss region of northern Jiangsu Province in China. Through correlation analysis of runoff and soil loss during 364 rainfall events, a simplified and convenient mathematical formula suitable for calculating the rainfall erosivity factor (R) for the local region was established. Other factors of the universal soil loss equation (USLE model) were also determined. Relative error analysis of the soil loss of various plots calculated by the USLE model on the basis of the observed values showed that the relative error ranged from -3.5% to 9.9% and the confidence level was more than 90%. In addition, the relative error was 5.64% for the terraced field and 12.36% for the sloping field in the practical application. Thus, the confidence level was above 87.64%. These results provide a scientific basis for forecasting and monitoring soil and water loss, for comprehensive management of small watersheds, and for soil and water conservation planning in the region

Keywords granite gneiss region   soil erosion   universal soil loss equation   factor value   applicability evaluation  
Received 2009-01-21 Revised 2009-03-20 Online:  
DOI: 10.3882/j.issn.1674-2370.2009.02.010
Corresponding Authors: Wen-hai ZHANG
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