Surface roughness effects on soil loss rate in complex hillslopes under laboratory conditions

Mombini, Ava; Amanian, Nosratollah; Talebi, Ali; Kiani-Harchegani, Mahboobeh; Rodrigo‐Comino, Jesús

doi:10.1016/j.catena.2021.105503

Cited by 10 publications

(5 citation statements)

References 50 publications

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“…During erosion, the corresponding covering effects of hard‐to‐transport coarse rock fragments are gradually exerted over time (Figure 4a), making the slope gradually approach the rock cover pattern, which differs significantly from the rock cover directly applied (Cochrane et al, 2019; Ni et al, 2020; Ni, Wen, et al, 2022; Sharmeen & Willgoose, 2007). Accumulated rock fragments could directly increase surface roughness and shield the soil surface by pedestalling or protruding (Campbell et al, 2018; Mombini et al, 2021; Poesen et al, 1998; Rieke‐Zapp et al, 2007; van Wesemael et al, 1996; Wang et al, 2012). The increase of surface roughness gradually enhances greater resistance to flow velocity, impeding runoff detachment and transport processes, thereby reducing the erosion potential and altering the erosion patterns (Li, Nearing, Polyakov, Nichols, & Cavanaugh, 2020; Nearing et al, 1999, 2017; Ni, Wen, et al, 2022).…”

Section: Relationship Between Rock Fragments and Slope Erosionmentioning

confidence: 99%

A review of impacts of soil rock fragments on slope erosion: Mechanism and processes

Ni,

Shi,

Zhao

et al. 2024

Land Degrad Dev

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Rock fragments play a pivotal role in influencing slope erosion processes, attracting increasing scientific interest and growing concerns regarding their potential impacts on erosion. This paper reviews the studies published in recent decades concerning the various impacts of rock fragments on soil erosion processes by water, highlighting the research gaps and outstanding challenges in exploring the erosion evolution process involving rock fragments. Systematic studies and illustrative examples have shown that the impacts of rock fragments characteristics (such as coverage, content, size, position, shape, and spatial heterogeneity) on erosion processes are complex and inconsistent (positive/negative). This uncertainty can be attributed to the intricate erosion process and the diverse rock fragment characteristics, complicating the development of accurate erosion prediction models. Current models predominantly focus on rock cover and often ignore the essential factors including rock size, position, and shape, thus impeding the precise understanding of how rock fragment characteristics specifically affect soil erosion within existing erosion models. Furthermore, this review discusses the perspectives for enhancing the research on rock fragment impacts on soil erosion processes and provides insights into potential research requirements and solutions.

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Section: Relationship Between Rock Fragments and Slope Erosionmentioning

confidence: 99%

A review of impacts of soil rock fragments on slope erosion: Mechanism and processes

Ni,

Shi,

Zhao

et al. 2024

Land Degrad Dev

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“…When the gradient reaches a threshold value, the runoff and soil loss tend to stabilize (Zhang, Hu, et al, 2018). In contrast, the presence of slope form exerts a substantial influence on soil erosion, which has been demonstrated under laboratory conditions (Mombini et al, 2021). Convex hillslopes typically consist of a hillslope with a relatively gentle gradient and a gully with a steeper gradient.…”

Section: Introductionmentioning

confidence: 99%

Vegetation pattern and topography determine erosion characteristics in a semi‐arid sandstone hillslope‐gully system

Zhu,

Yu,

Liu

et al. 2024

European J Soil Science

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The hillslope‐gully system serves as the primary contributor to both runoff and sediment yield. The WEPP (Water Erosion Prediction Project) model is often applied to investigate erosion characteristics at hillslope scale, demonstrating a high level of accuracy in simulating water erosion. In this study, according to in situ field monitoring (2014–2020) at a Pisha sandstone hillslope on the Loess Plateau, China, a total of 50 rainfall events’ data were used as climatic data to calibrate the soil parameters, and 11 different vegetation patterns and four slope gradients of hillslope‐gully systems were installed as inputs for the management and slope data, respectively. In systems A, B, C and D, the hillslope gradients were defined as 5°, 8°, 10° and 12° and the gully gradients as 15°, 20°, 25° and 30°, respectively. The results showed that the steeper the slope, the more severe the erosion. However, there was a critical value for the effect of slope on runoff. When the slope exceeded 8° and the gully exceeded 20°, the runoff no longer increased further and even decreased. The reduction in runoff in hillslope‐gully systems was in the following order (in mm): system D (3.4 ± 0.14) > system C (3.4 ± 0.14) > system B (3.39 ± 0.14) > system A (3.12 ± 0.13). Increasing vegetation cover could reduce erosion. Differences in runoff between vegetation patterns were not significant (p > 0.05) and ranged from 8% to 26%. However, there were significant differences in the sediment yield reduction benefits of different vegetation patterns (p < 0.05), ranging from 17% to 66%. It was observed that vegetation located in the lower slope produced a more pronounced effect in mitigating sediment when the degree of cover was the same. We conclude that implementing watershed management strategies based on the vegetation and topographic attributes of hillslope‐gully systems within the Loess Plateau, especially on Pisha sandstone hillslopes, serves as the fundamental approach to achieving sustainable watershed management.

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“…All of these studies show that surface conditions such as roughness, vegetation and structure have an important influence on runoff generation and erosion. The increase in roughness will increase soil infiltration and delay the production time of runoff [25][26][27]. Li et al's research showed that with the increase in the complexity of vegetation patterns, the proportion of large aggregates and the stability of aggregates on the wall of most terraces showed an increasing trend, which could effectively reduce soil erosion [28].…”

Section: Introductionmentioning

confidence: 99%

Runoff and Sediment Deposition Characteristics of Gravel-Mulched Land: An Experimental Study

Wang,

Luo,

et al. 2024

Land

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The hydrological characteristics of gravel-containing soils are different from those of gravel-free soils, so it is worth further understanding and enriching the theory of soil and water conservation. In this study, adjustable slope (10°, 20°, 30°) test soil boxes with different surface gravel contents (0%, 25%, 50%, 75%, 100%) were prepared to study the runoff erosion characteristics of gravel-covered land slopes under different rainfall conditions (10 mm/h, 20 mm/h, 30 mm/h). Compared with the bare soil, the runoff start time of the three slopes covered with 100% soil surface gravel content is delayed by 38.90, 32.83 and 73.39%, the runoff producing rate of gravel condition under different slopes decreased by 7.20–71.52% and the total amount of sediment yield decreased by 7.94~84.57%. Surface gravel cover can effectively reduce runoff and sediment yield, which is beneficial for better soil and water conservation. The results of this study have a certain reference value for the theory of soil and water conservation and can be used as a basis for guiding efficient agricultural production in gravel-mulched land and construction (like road slope improvement).

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Surface roughness effects on soil loss rate in complex hillslopes under laboratory conditions

Cited by 10 publications

References 50 publications

A review of impacts of soil rock fragments on slope erosion: Mechanism and processes

A review of impacts of soil rock fragments on slope erosion: Mechanism and processes

Vegetation pattern and topography determine erosion characteristics in a semi‐arid sandstone hillslope‐gully system

Runoff and Sediment Deposition Characteristics of Gravel-Mulched Land: An Experimental Study

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