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                   Simulation of erosion process on loessal slope in western Shanxi by using EUROSEM


                                        1             2            1            1           1
                            WANG Qihua ,GAO Yufeng ,TIAN Chen ,LI Mengyao ,FU Xingtao
                      (1. College of Water Resources Science and Engineering,Taiyuan University of Technology,Taiyuan  030024,China;
                                 2. Institute of Soil and Water Conservation Shanxi Province,Taiyuan  030013,China)


                   Abstract:Loessal slope in Western Shanxi can cause severe soil erosion due to its typical soil and rainfall
                   conditions. Based on the different combinations of slope lengths (2, 3, 4m) and artificial rainfall intensi⁃
                   ties (60,90,120mm/h) in the field,this study simulated the runoff and sediment yield processes by us⁃
                   ing ERUOSEM. Likewise, the simulated results and experimental measured values were compared to evalu⁃
                   ate the simulation effectiveness of the EUROSEM and its applicability in study area. The results show that
                   both of slope length and rainfall intensity have positive relationships with total runoff volume and sediment
                   yield,furthermore,rainfall intensity has greater effect than the slope length,but they are restricted mutual⁃
                   ly. Whereas, partial correlation analysis indicates that both rainfall intensity and slope length have greater
                   correlation coefficient when act on runoff and sediment yield separately. There is a slight deviation between
                   the peak time of simulated runoff rate and the measured value, and the first time of the peak sediment
                   transport rate is about 5 minutes earlier than the actual one. When rainfall intensity greater than 60mm/h
                   and the slope length extends from 3m to 4m, the increments of runoff and sediment yield decrease than
                   that from 2m to 3m. In addition, when the slope length is 4m, the simulated values of total runoff and
                   sediment yield are almost all greater than the measured values. In summary,EUROSEM is well applied to
                   loessal soil in Western Shanxi and is more accurate on simulating runoff process than on sediment yield
                   process. The relative error RE between runoff and sediment yield simulated and the measured values is with⁃
                   in the allowable range,and ME are 0.978 and 0.974,respectively.
                   Keywords:EUROSEM;loessal soil;slope length;rainfall intensity;runoff volume;sediment yield

                                                                                   (责任编辑:韩         昆)


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