Preprints
https://doi.org/10.5194/hess-2021-399
https://doi.org/10.5194/hess-2021-399
 
03 Aug 2021
03 Aug 2021
Status: this discussion paper is a preprint. It has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.

Rill Erosion on Slope of Spoil tips: experimental study of runoff scouring erosion in multiple times

Yongcai Lou1, Zhaoliang Gao1,2, Fuyu Zhou1, Jianwei Ai1, Yunfeng Cen1, Tong Wu2, and Jianbin Xie3 Yongcai Lou et al.
  • 1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Water and Soil Conservation, Northwest A&F University, Yangling, Shaanxi, China
  • 2Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi, China
  • 3College of Architecture and Plianning, Kunming, Yunnan, China

Abstract. The soil erosion of the spoil tips seriously threatens the safety of people's lives and property and the surrounding ecological environment. Rill erosion is an important cause of water and soil loss in spoil tips. This study was conducted to investigate the process of rill erosion on the slopes of spoil tips, changes in the morphological characteristics of rills and the mechanisms of rill erosion. A Field runoff plot (5 m long, 1 m wide and 0.5 m deep) with three inflow rates (1.6, 2 and 2.4 mm min−1) and three typical slopes (28°, 32° and 36°) was used for runoff simulation experiments. The results showed that, compared with the slope and scouring times, inflow rate was the most important factor affecting rill erosion of the spoil tips. The development of rill mainly goes through three stages: the rill formation stage, the rill development stage and the rill adjustment stage. The overall predominance of parallel-shaped rills at all experiments suggested that the formation of rills was dominated by concentrated runoff. The average rill depth was the best indicator of rill morphology for evaluating rill erosion. The flow regimes under the experimental conditions were supercritical-laminar flow and supercritical-transition flow. The Reynolds number was the best hydraulic parameter for predicting rill erosion. The stream power was the best hydrodynamic parameter to describe rill erosion mechanism. These results contributed to further revealing the rill erosion mechanism on the slope of the spoil tips and provided a scientific basis for its soil erosion control.

Yongcai Lou et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on hess-2021-399', Gundy Gu, 09 Aug 2021
    • AC1: 'Reply on CC1', Zhaoliang GAO, 24 Sep 2021
      • CC3: 'Reply on AC1', Gundy Gu, 10 Oct 2021
        • CC4: 'Reply on CC3', Wenlong Wang, 22 Oct 2021
  • CC2: 'Comment on hess-2021-399', Lu Zhang, 17 Aug 2021
    • AC2: 'Reply on CC2', Zhaoliang GAO, 24 Sep 2021
  • RC1: 'Comment on hess-2021-399', Anonymous Referee #1, 27 Aug 2021
    • AC3: 'Reply on RC1', Zhaoliang GAO, 24 Sep 2021
    • RC2: 'Comment on hess-2021-399', Anonymous Referee #1, 30 Sep 2021
      • AC9: 'Reply on RC2', Zhaoliang GAO, 29 Nov 2021
  • RC3: 'Comment on hess-2021-399', Anonymous Referee #2, 01 Oct 2021
    • AC7: 'Reply on RC3', Zhaoliang GAO, 24 Oct 2021
    • RC4: 'Reply on RC3', Anonymous Referee #3, 31 Oct 2021
      • AC8: 'Reply on RC4', Zhaoliang GAO, 24 Nov 2021
  • EC1: 'Comment on hess-2021-399 - Attention when uploading the replies', Nunzio Romano, 24 Oct 2021
    • AC6: 'Reply on EC1', Zhaoliang GAO, 24 Oct 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on hess-2021-399', Gundy Gu, 09 Aug 2021
    • AC1: 'Reply on CC1', Zhaoliang GAO, 24 Sep 2021