Erosion Sediment Yield Characteristics of Storm-floods in the Ephemeral Desert Watershed

doi:10.7522/j.issn.1000-694X.2018.00064

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (2): 96-104.DOI: 10.7522/j.issn.1000-694X.2018.00064

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Erosion Sediment Yield Characteristics of Storm-floods in the Ephemeral Desert Watershed

Li Yongshan^1,2, Siqing Bilige³, Ma Qimin^1,2, Wang Haibing⁴, Jia Xiaopeng¹

1. Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Forestry Bureau of Ordos, Ordos 017000, Inner Mongolia, China;
4. College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010011, China

Received:2018-01-10 Revised:2018-03-16 Published:2019-04-11

Abstract

Abstract: In ephemeral desert river in semi-arid regions, flash floods induced by storm rain can cause a hyper-intensity of erosion sediment yield and make a serious soil and water loss, posing a threat to local ecology-environment system and downstream river system. In this paper, we have chosen Sudaer river as the study area to reveal typical ephemeral desert watershed flood erosion characteristics caused by storm rain, which support water and soil conservation locally and integrated watershed management. Based on analysis for the six storm-floods monitored from 2011 to 2015 in the Sudaer watershed, we have analyzed sediments characteristic of the underlying surface and storm-flood process, and shown erosion sediment yield characteristic induced by flood in this desert watershed. Results show that the total sediment yield of single storm-flood was about 37.69×10⁴ t on average, with a maximum 90.47×10⁴ t of flood event 130721№; specific sediment yield was 0.57·10⁴ t·km^-2 on average, with a maximum 1.36×10⁴ t·km^-2 of flood event 130721№. Main grain fraction of sediments yield caused by storm-flood was 0.25-063 mm that made up about 74% of the total sediment yield. Meanwhile, the lager storm-flood event, the higher sediment yield intensity, and the bigger contribution of the lower desert reaches to total sediment yield, coupled with increased the contribution of aeolian sand. In addition, slope erosion amount accounted for about 4.37%, mainly occurred in the upstream hillslope.

Key words: desert gully, storm-flood, erosion sediment yield

CLC Number:

P344

Li Yongshan, Siqing Bilige, Ma Qimin, Wang Haibing, Jia Xiaopeng. Erosion Sediment Yield Characteristics of Storm-floods in the Ephemeral Desert Watershed[J]. Journal of Desert Research, 2019, 39(2): 96-104.

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Erosion Sediment Yield Characteristics of Storm-floods in the Ephemeral Desert Watershed

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