Juan An’s research while affiliated with Linyi University and other places

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Publications (1)


The application of contour ridge systems and contour failure on slopeland
Runoff plot for adjusting row grade and field slope simultaneously by rotating a screw (a) and (b) and rill formed on the row sideslope. a, screw for adjusting row gradient; b, screw for adjusting field slope; g and f, outlet for collecting runoff and sediment; h the ridge; i, the rill
Size distribution of micro-aggregate fractions observed for the four storm patterns (the rising, falling, falling–rising, and rising–falling patterns). Bars indicate standard deviations; values within the same size class by the same uppercase letters are not significantly different at the 0.05 probability level by LSD, and values for a given storm pattern by the same lowercase letters are not significantly different at the 0.05 probability level by LSD
Soil aggregate loss of a given rainfall intensity (30, 60, and 90 mm h⁻¹) within the four storm patterns (rising, falling, falling–rising, and rising–falling patterns). Bars indicate standard deviations; different letters indicate significant differences at the 0.05 probability level
Size distribution of micro-aggregate fractions from 30, 60, and 90 mm h⁻¹ intensities within the four storm patterns (rising, falling, falling–rising, and rising–falling patterns). Bars indicate standard deviations; values within the same size class by the same lowercase letters are not significantly different at the 0.05 probability level by LSD

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Rainstorm pattern effects on the size distribution of soil aggregate in eroded sediment within contour ridge systems
  • Article
  • Full-text available

April 2020

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245 Reads

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10 Citations

Journal of Soils and Sediments

Juan An

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Purpose Intra-storm temporal distributions of rainfall intensity (storm patterns) greatly affect soil erosion process within flat tillage systems, but limited information is available about its influence on the distribution characteristics of soil aggregate, especially within contour ridge system. Materials and methods In this study, a laboratory study of 12 rainfall simulation experiments was conducted to analyze the loss characteristic of 16 sizes aggregate in eroded sediment within contour ridge system under the rising, falling, rising–falling, and falling–rising patterns. All patterns included three rainfall intensities, 30, 60, and 90 mm h⁻¹, and comprised the same rainfall amount and kinetic energy. Results and discussion The results showed that storm patterns showed significant influence on soil aggregate loss. The rising–falling, falling–rising, and falling pattern had 1.43, 1.11, and 1.04 times soil aggregate loss greater than the rising pattern, respectively. Differences in size distribution of soil aggregate among storm patterns mainly concentrated on the most eroded size of microaggregate, especially 50–100 μm fraction. An intensity of 30 mm h⁻¹ made the greatest contribution of 100.87%–511.93% to the diversity of soil aggregate loss following the storm pattern simulations relative to 60 and 90 mm h⁻¹ intensities, likely resulting from erosion process, soil aggregate detachment, and runoff transport abilities from 30 mm h⁻¹ intensity varying within storm pattern duration. The occurring periods of rainfall intensity significantly affected the loss of each size aggregate and showed the most obvious influence on 50–100 μm aggregate. Effects of storm pattern and rainfall intensity occurring periods were more pronounced with the increase of aggregate size at the macro-aggregate scale. Contour failure was easily to occur under the most prevalent storm pattern—falling and rising–falling patterns—which comprised 59.44% of soil aggregate loss. Conclusions Results recommended that more attention should be given to contour ridge stability, especially under falling and rising–falling patterns. Incorporating contour failure and the occurring context of rainfall intensity into the erosion model could successfully simulate soil aggregate loss characteristics, especially small-sized aggregates.

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Citations (1)


... Rainfall from rainstorm more easily accumulated in the low areas of furrows and caused the occurrence of contour failures by breaching of ridges (Xu et al. 2018). Contour failure supplied an abundant source of sediment for the convergent flow to transport (Liu et al. 2014) and preferentially removed these nutrient-enriched finer particles (Issa et al. 2006;An et al. 2020). Meanwhile, concentrated flow was easily generated under rainstorm (Boardman 2015), which undoubtedly enhanced the capacity of runoff transport for sediment during contour failure phase. ...

Reference:

Response of nutrient loss to natural erosive rainfall events under typical tillage practices of contour ridge system in the rocky mountain areas of Northern China
Rainstorm pattern effects on the size distribution of soil aggregate in eroded sediment within contour ridge systems

Journal of Soils and Sediments