Abstract
This chapter presents the classification and geomorphic features of gullies, spatial variability of soil shear strength within the gullies, major erosion processes and controlling factors of gully development, gully erosion susceptibility, and sediment production by gullies. All the channels in the WJG watershed are classified into headwater gully, hillside gully, valleyside gully and ephemeral stream. It is found that tunnel erosion is mainly associated with headwater gullies and hillside gullies, but almost absent in valleyside gullies and ephemeral streams. The dominant types of mass movement are also varied among different types of gullies. Soil shear strength at gully wall, knickpoint and gully headcut are generally much higher than that at other parts of a gully. Sediment production from the gully area accounts for 80.3% of the total sediment yield from a small headwater catchment. It should be noted that mass movement and tunnel erosion contribute significantly to the sediment production of the gully. The gully erosion susceptibility map created in this study can provide useful information about gully erosion risk areas in the watershed.
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