PROGRESS IN GEOGRAPHY ›› 2018, Vol. 37 ›› Issue (3): 342-351.doi: 10.18306/dlkxjz.2018.03.005

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Benggang erosion landform and research progress in a global perspective

Xilin LIU1,2()   

  1. 1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China
    2. Guangdong Key Laboratory for Urbanization and Geo-Simulation, Guangzhou 510275, China
  • Received:2017-08-22 Revised:2017-12-21 Online:2018-03-28 Published:2018-03-28
  • Supported by:
    National Natural Science Foundation of China, No.41071186


The typical benggang has an amphitheater-like gully-head, mainly occurs in the deeply weathered granite area in southern and southeastern China. It usually consists of five parts: water-collection slope, headwall, colluvium, channel, and debris fan. From top to bottom, benggang headwall may be divided into four soil layers: topsoil, red soil, sandy soil, and clastic soil. Benggang in China and lavaka in Madagascar belong to the same type of landform with comparable geomorphologic characteristics. Benggang may be considered as one of the badland landscapes, but it has different erosion process. It is also different from the other two gully erosion landforms in Italy and Brazil: calanchi and vocoroca. Benggang is mainly distributed in moderate hilly region and subtropical maritime climate zone of southern and southeastern China. Usually benggang is also considered to develop from gully erosion, and it is treated as the advanced stage of gully evolution. The sediment yield of benggang channel erosion accounts for more than half of the sediment amount of the whole benggang gully catchment, and likewise the sediment yield of channel-bed accounts for about half of the sediment amount of the whole gully catchment. Simulated rainfall is a powerful tool to study the effects of rainfall on surface processes and erosion. The in situ artificial simulated rainfall is an effective method to study benggang erosion, slope runoff, and sediment transportation in benggang gully catchment. Benggang erosion is a geomorphic critical phenomenon. This critical phenomenon occurs only when the rainfall, topography, soil, and runoff exceed their critical thresholds. Field artificial rainfall experiments based on simulated rainfall-slope runoff-erosion process-sediment production observations may greatly improve the understanding of benggang erosion in southern and southeastern China. The sediment yield of benggang catchment may be estimated by the morphometric analyses on the topographies of benggang gully and debris fan

Key words: benggang catchment, morphometric analysis, simulated rainfall, slope runoff, gullying process, sedi ment yield