Vol16 No.6: 1396-1407
【Title】Soil erosion of unpaved loess roads subjected to an extreme rainstorm event: a case study of the Jiuyuangou watershed on the Loess Plateau, China
【Author】YANG Bo1,4; WANG Wen-long1,2,3*; GUO Ming-ming1; GUO Wen-zhao1; WANG Wen-xin1; KANG Hong-liang1; ZHAO Man1; CHEN Zhuo-xin1
【Addresses】1 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China; 2 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China; 3 Key Laboratory of Ecological Restoration of Mining Area in Northern Shaanxi Province, Yulin University, Yulin 719000, China; 4 Yellow River Engineering Consulting Co., Ltd, 109 Jinshui Road, Zhengzhou 450003, China
【Corresponding author】WANG Wen-long
【Citation】Yang B, Wang WL, Guo MM, et al. (2019) Soil erosion of unpaved loess roads subjected to an extreme rainstorm event: a case study of the Jiuyuangou watershed on the Loess Plateau, China. Journal of Mountain Science 16(6). https://doi.org/10.1007/s11629-018-5211-z
【Abstract】Rainfall can causeserious soil loss in the Loess Plateau hilly and gully region, but little focus has been placed on the extreme rainstorm effects on unpaved loess road soil erosion. A field survey method was used to investigate the erosional effects of the "7·26" heavy rainfall event on unpaved loess roads in the Jiuyuangou watershed of the Loess Plateau, China. The results showed that the average and maximum widths of the eroded gullies that formed on the unpaved roads were 0.65-1.48 m and 1.00-3.60 m, respectively. The average and maximum depths of the eroded gullies were 0.42-1.13 m and 0.75-4.30 m, respectively. The average width-to-depth ratio was 1.31, indicating that the widening effect was greater than the downcutting effect in the eroded gullies. In addition, the gully density ranged from 0.07 to 0.29 m m-2, and the road surface dissection degree ranged from 0.03 to 0.41 km² km-². Eroded gullies generally developed at the slope toe of the cut bank side. The average eroded gully width and depth at turns in the road were 1.47-2.64 times and 1.30-3.47 times greater, respectively, than those in other road sections. The road erosion modulus increased from the upper section to the lower section of the roads. The average road erosion modulus of the study catchment was 235,000 t km-2. Turns in the road were associated with collapses, sinkholes and other gravitational erosion phenomena. The amount of road erosion under extreme rainfall conditions is mainly related to the interactions among road length, width, slope and soil bulk density. Our results provide a useful reference for developing further measures for preventing road erosion on the Loess Plateau.
【Keywords】Road erosion; "7·26" extreme rainstorms; Loess Plateau; Gully development