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| Dynamic process of slope rill erosion based on three -dimensional laser scanner |
| Huo Yunyun1 , Wu Shufang1，2, Feng Hao2, Yuan Lifeng3 |
| 1. Water and Architecture College, Northwest A&F University, 712100, Yangling, Shaanxi； 2. Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources, 712100 , Yangling, Shaanxi ； 3. Nanjing Institute of Geography and Limnology，China Academy of Sciences, 210008, Nanjing： China |
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Abstract In this paper, the 3D laser scanner were used to probe the dynamic process of rill erosion under the same slope by a multi-rainfall condition, which may provide certain theoretical basis for explaining the rill erosion process. The artificial rainfall simulation in room were adopted. Seven rainfall scouring experiments with the constant rainfall intensity were carried out on the soil bin with the slope of 150 and the 3D laser scanner was used to make the real-time monitoring of the slope pattern after each rainfall. The studies mainly focus on the dynamic development process of slope rill erosion. Results showed that there were great differences in the process of runoff, sediment and the development of rill erosion. Between the first two rainfall events and the last five ones. The rill developed obviously after the third rainfall event. Rill erosion process was presented as： small hydraulic drop - incised gully head 一 intermittent rill 一 continuous rill - rill network. By monitoring the changes of the slope points inmicrotopography using 3D laser scanner, it was found that the change range of landform is relatively small in the average rill width, the average rill depth，the maximum rill length, the average rill density during the first two rainfall events. These parameters began to increase rapidly after the third rainfall event. Rill erosion intensity was constantly strengthened from 0. 103 kg/m2 under the first rainfall to 8. 788 kg/m2 under the seventh rainfall with an increase of 84 times.
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Received: 02 November 2010
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