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| Characteristics of slope collapse and its monitoring technology in Southern China |
| Liu Honghu1 , Liu Xianchun2 , Zhang Pingcang1，Wang Yifeng1 |
| 1. Changjiang River Scientific Research Institute, Changjiang Water Resource Commission, 430010, Wuhan；2. Soil and Water Conservation Monitoring Center, Ministry of Water Resources, 100853 , Beijing：China |
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Abstract " Benggang" ( slope collapse) as one of serious soil erosion types is typical in the southern red soil region. Based on its characteristics and all studies before, it is referred as the landscape of gully ero- ion in granite hill. Due to the great difference in elevation and large inclination angle of wall, it is very difficult to monitor gully characteristic and measure the soil loss made by slope collapse. Thus, little data was received for the retreat rate of gully wall and gully head and soil loss rate. By analyzing the advanta-ges and disadvantages of soil erosion monitoring techniques, this study will propose the practicable moni-toring technique to measure slope collapse combining with geomorphic characteristic of gully. The results are as follows ： the runoff plots and artificial rainfall simulation experiment technology can only be used for sheet and rill erosion. Tracer technology can be used for sheet and rill erosion and gully erosion, but can-not satisfy the requirement of slope collapse in the southern red soil region. The traditional technology,such as erosion needle，cannot monitor accurately the erosion rate of slope collapse in the red soil region.The data using differential GPS has a specific error due to the great difference in elevation of gully wall.3D laser scanning system can overcome these difficulties and accurately scan the morphological character-istics. By interpreting air-photo, morphological characteristics of gully can be obtained. If comparing with the field data, the gully characteristics data would be more accurate. In addition, when gully is measured by the traditional technology，such as erosion needle and differential GPS，the safety of monitoring work-ers should be verified.
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Received: 24 December 2010
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