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| Characteristics of slope runoff and sediment production under rainfall events in the plateau area of western Guizhou |
| Gu Libin1, Zhang Xingqi1, Yang Guangxi2, Gu Zaike2 |
| 1. School of Geographic and Oceanographic Sciences at Nanjing University, 210023, Nanjing, China; 2. Guizhou Monitoring Station of Soil and Water Conservation, 550002, Guiyang, China |
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Abstract Based on field observations of runoff and sediment generated on runoff plots and rainfall data, we studied quantitatively the impact of rainfall on slope runoff and sediment production in the plateau area of western Guizhou. The results showed that: 1) there are 22 events of erosive rainfall annually on average in the study area, in which rainfall events of moderate and low intensities account for 93.02% of the total number of events. 2) Characteristics of slope runoff and sediment production have a close relationship with the rainfall distribution within a year. The amount of sediment generated from May to August accounted for 99.2% and that of runoff during the same period of time accounted for 95.8% of the total. 3) The amount of slope sediment showed a significantly exponential relationship with the amount of rainfall with an equation of M = 0.346e0.109P . 4) Slope runoff and sediment production were significantly correlated with rainfalls of moderate and high intensities, which can be demonstrated by that 57.3% of the total runoff and 91.5% of the total sediment were produced in four heavy rainfall events.
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Received: 20 August 2014
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