Characteristics of slope collapse and its monitoring technology in Southern China
LIU Hong-Gu, LIU Xian-Chun, ZHANG Beng-Cang, WANG Yi-Feng
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
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.
基金资助:长江科学院中央级公益性基本科研业务费“南方红壤区崩岗机理初步研究"（CKSF2010007);中德交流项目“As-sessment of freshwater ecosystems under global change" ( GZ465 )
引用本文:
刘洪鹄1，刘宪春2，张平仓1，王一峰1. 南方崩岗发育特征及其监测技术探讨[J]. 中国水土保持科学, 2011, 9(2): 19-23.
LIU Hong-Gu, LIU Xian-Chun, ZHANG Beng-Cang, WANG Yi-Feng. Characteristics of slope collapse and its monitoring technology in Southern China. SSWCC, 2011, 9(2): 19-23.
2011, Vol. 9 
