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Arid Land Geography >

2022 , Vol. 45 >Issue 5: 1500 - 1512

DOI: https://doi.org/10.12118/j.issn.1000-6060.2021.597

Earth Surface Process

Variation characteristics of the fetch effect of near surface aeolian sand flux for farmlands

  • Zhe FENG ,
  • Ruijuan LIU ,
  • Yuchen BAI ,
  • Chunping CHANG ,
  • Zhongling GUO ,
  • Jifeng LI ,
  • Rende WANG ,
  • Qing LI
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  • 1. School of Geographical Sciences, Hebei Normal University, Shijiazhuang 050024, Hebei, China
    2. Hebei Key Laboratory of Environmental Change and Ecological Construction, Shijiazhuang 050024, Hebei, China
    3. Hebei Technology Innovation Center for Remote Sensing Identification of Environmental Change, Shijiazhuang 050024, Hebei, China
    4. Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050021, Hebei, China

Received date: 2021-12-13

  Revised date: 2022-03-21

  Online published: 2022-10-20

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Abstract

The fetch effect in aeolian sand transport is a cornerstone for wind erosion modeling and sand dune evaluation. The fetch effect refers to an increase in aeolian sand transport with downstream distance over an eroding surface. The maximum sand flux (fmax) and corresponding critical fetch length (Lsat) are the primary parameters related to the fetch effect. In this paper, a cyclone type instantaneous weighing aeolian sand trap (CCST) was used to observe four typical wind erosion events in 2017, 2018, and 2021 in two farmland regions of Kangbao County, Hebei Province, China. We analyzed the 5 min characteristics of the fetch effect of sand flux at a height of 5 cm above the ground surface. The results revealed that: (1) The aeolian sand flux near the surface increases with the increase in fetch length. (2) The variations of Lsat for the four wind erosion events range from 11 m to 280 m and were obvious and independent on wind velocity (U). (3) The relationship between fmax and U followed a power-law relationship. (4) The extent of the fetch effect may be related to factors including the soil wind erodibility and surface microrelief. More studies are required to explore how the factors related to soil wind erodibility and surface microrelief affect the fetch effect.

Key words： soil wind erosion; fetch effect; maximum sand flux; critical fetch length

Cite this article

Zhe FENG , Ruijuan LIU , Yuchen BAI , Chunping CHANG , Zhongling GUO , Jifeng LI , Rende WANG , Qing LI . Variation characteristics of the fetch effect of near surface aeolian sand flux for farmlands[J]. Arid Land Geography, 2022 , 45(5) : 1500 -1512 . DOI: 10.12118/j.issn.1000-6060.2021.597

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