Effects of microtopography change driven by seepage and slope gradients on hillslope erosion of purple soil

Yang, Feixiong; Wang, Nana; Zheng, Zicheng; Li, Tingxuan; He, Shuqin; Zhang, Xizhou; Wang, Yongdong; Huang, Huagang; Yu, Haiying; Ye, Daihua; Liu, Tao

doi:10.1016/j.catena.2023.107353

Cited by 8 publications

(2 citation statements)

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“…Simultaneously, they may change the distribution of larger soil pores and pore connectivity, promoting subsurface flow while reducing surface runoff generation. This dynamic contributes to the observed increase in resistance coefficients and reduction in runoff shear forces [13,30,43]. In summary, the presence of bedrock within the soil significantly impacts the hydrological characteristics and erosion processes.…”

Section: Discussionmentioning

confidence: 95%

“…In contrast, the Dec pattern had higher initial kinetic energy, which had a more pronounced effect on altering surface microtopography. In the later stages of rainfall, when the soil on the slope became saturated, the transport of sediment was primarily influenced by the detachment and transport capacity of runoff, leading to variations in runoff volume and sediment yield with changing rainfall intensity [30]. For soils like purple soil, which have a dual-layer structure with a shallow upper soil layer and underlying weathered parent rock and are susceptible to internal erosion and deep infiltration, the impact of rainfall patterns on erosion becomes more apparent.…”

Section: Discussionmentioning

confidence: 99%

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Bedrock Fragment Induced by Intensive Tillage Effect on Hydrological Properties and Erosion Processes under Different Rainfall Patterns

Wang,

He,

Zhang

et al. 2023

Agronomy

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To investigate the influence of bedrock fragmentation by intensive tillage on the hydrological characteristics and soil erosion processes on slopes, two experimental treatments (soil–bedrock mixtures, WB, and pure soil, CK) in steel tanks were subjected to simulated rainfall under five rainfall patterns (constant, increasing, decreasing, decreasing–increasing, and increasing–decreasing) with the same total rainfall of 90 mm. For each rainfall event, runoff and sediment concentration were sampled at regular intervals. The flow velocity (v), effective/critical shear stress (τ/τc), Darcy–Weisbach resistance coefficient (f), unit stream power (p), and soil erodibility factor (Kr) were calculated to analyze the differences in hydrodynamic characteristics between the WB and CK. Our experimental findings show that significant differences in runoff volume and sediment yield were observed among different rainfall patterns and stages. Bedrock fragmenting significantly promoted runoff and sediment production under different rainfall patterns, with runoff volume and sediment yield increasing by averages of 59.29% and 71.62%, respectively. An increasing trend in average contribution rate of bedrock to runoff volume and sediment yield was observed across three distinct intensities: 6.37% and 4.61% for 30 mm h−1, 12.53% and 7.53% for 90 mm h−1, as well as 14.79% and 36.98% for 150 mm h−1, respectively. The v and p values under various rainfall patterns exhibited an increasing trend from the upper to the bottom slope positions, whereas the f and τ values showed an opposite trend, regardless of the WB and CK. Compared with the CK, the v, f, and p values for the WB increased by 23.34% to 48.94%, 1.59% to 53.16%, and 3.86% to 27.86%, respectively, whereas the τ value decreased by 1.52% to 22.19% for varying-intensity rainfall patterns. Among the variable rainfall patterns, the WB significantly increased sediment yield and also had a promoting effect on runoff generation. However, the WB displayed better erosion resistance compared to the CK under constant rainfall patterns. Therefore, varied-intensity patterns had a profound impact on bedrock-induced runoff and sediment transport processes.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%