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《Journal of Soil and Water Conservation》 2017-04
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Aggregate Loss Characteristics on Red Soil Slope Under the Combination of Rainfall Simulator

CAO Danni;DU Yifan;HAO Haoxin;GUO Zhonglu;ZHAN Haige;Research Center of Water and Soil Conservation,Huazhong Agricultural University;  
To understand the characteristics of erosive aggregate loss in tropical and subtropical zones,a combination experiment of two discharge flow(5L/min and 7.5L/min)and four simulated rainfall intensities(0mm/h,60mm/h,90mm/h,120mm/h)was conducted.The variation characteristics of aggregates,such as mean weight diameter(MWD),geometric mean diameter(GMD),fractal dimension(D),mean weight soil specific area(MWSSA),were analyzed.The results showed that:the aggregates of0.05 mm occupied 19%~58% of the total sediment during the early phase of the event,and the tendency declined first then stabilized with rainfall duration.The content of0.25 mm aggregates in erosive sediment was highest,and the tendency increased first and stabilized later,with the rainfall duration.When the discharge flow increased from 5 L/min to 7.5 L/min under the same rainfall intensity,MWD and GMD of aggregates increased,while Dand MWSSA decreased.MWD and GMD of aggregates in the sediments without rainfall were lower than that in the rainfall;however,Dand MWSSA of aggregates in the sediments without rainfall were higher than those with rainfall.Under the condition of the same rainfall,MWD and GMD increased as rainfall intensity increased,while Dand MWSSA decreased.
【Fund】: 国家自然科学基金项目(41671273 40901132)
【CateGory Index】: S157.1
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