Efficacy of Grass for Mitigating Runoff and Erosion from an Artificial Loessial Earthen Road

Liu, G.; Tian, Fuchang; Warrington, David N.; Zheng, Shi Qing; Zhang, Q.

doi:10.13031/2013.29509

Cited by 30 publications

(18 citation statements)

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“…With climate change, extreme rainstorms are expected to increase in frequency on the Loess Plateau [56,57]. Extreme rainstorms increase erosion rates in highly managed watersheds, and this has been consistently found at home and abroad [58][59][60][61]. Accordingly, in this study, erosion increased significantly under high rain intensities as the vegetation coverage reached 0.9.…”

Section: Increasing Erosion and Changes In Runoff Generation-collection Mechanisms In Highly Managed Watersheds Under Extreme Rainstorm Csupporting

confidence: 54%

Erosion Transportation Processes as Influenced by Gully Land Consolidation Projects in Highly Managed Small Watersheds in the Loess Hilly–Gully Region, China

Gao

et al. 2021

Water

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The Loess Hilly–Gully region (LHGR) is the most serious soil erosion area in the world. For the small watershed with high management in this area, the scientific problem that has been paid attention to in recent years is the impact of the land consolidation project on the erosion environment in the gully region. In this study, the 3D simulation method of vegetation, eroded sediment and pollutant transport was innovated based on the principles of erosion sediment dynamics and similarity theory, and the impacts of GLCP were analyzed on the erosion environment at different scales. The verification results show that the design method and the scale conversion relationship (geometric scale: λl = 100) were reasonable and could simulate the transport process on the complex underlying surface of a small watershed. Compared with untreated watersheds, a significant change was the current flood peak lagging behind the sediment peak. There were two important critical values of GLCP impact on the erosion environment. The erosion transport in HMSW had no change when the proportion was less than 0.85%, and increased obviously when it was greater than 3.3%. The above results have important theoretical and practical significance for watershed simulation and land-use management in HMSW.

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Section: Increasing Erosion and Changes In Runoff Generation-collection Mechanisms In Highly Managed Watersheds Under Extreme Rainstorm Csupporting

confidence: 54%

Erosion Transportation Processes as Influenced by Gully Land Consolidation Projects in Highly Managed Small Watersheds in the Loess Hilly–Gully Region, China

Gao

et al. 2021

Water

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“…Shen, Zheng, Wen, Han, and Hu (2016) reported that, the measured velocity using KMNO4, is the mean velocity, and then, the value of K is 1. Other authors Liu et al (2010) measured the surface flow velocity using KMNO4, with a correction factor of 0.67. Smets, Poesen, Langhans, Knapen, and Fullen (2009) have measured flow velocity by injecting a dye tracer (brilliant blue G250 solution) and they used a correction factor K = 0.94.…”

Section: Surface Flow Velocity Measurementmentioning

confidence: 99%

“…The measurement of soil detachment in the presence of a vegetal cover has been the objective of several studies (Fattet et al, 2011;Liu, Tian, Warrington, Zheng, & Zhang, 2010). Furthermore, interrill erosion is caused by soil particles being detached by raindrops and transported by overland flow (Romero, Stroosnijder, & Baigorria, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…To describe the effect of vegetation cover on erosion and to understand the mechanism of erosion it is important to measure and estimate the hydraulic parameters that characterize the flow, such as, Reynolds number (Re), Froude number (Fr), and flow velocity parameters.The vegetation cover increases the resistance of the surface to erosion with increasing the roughness of the soil surface and it affects directly the flow velocity and shear stress by reducing both of them (Brookes, Hooke, & Mant, 2000). Furthermore, Liu et al (2010) note that vegetation cover affected the hydrological characteristics of the overland flow by reducing the Froude (Fr) and Reynolds number (Re). From this context, we understand that the overland flow hydraulics could contribute to estimate soil erosion under the vegetative cover.…”

Section: Introductionmentioning

confidence: 99%

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Vegetation cover effects on sediment concentration and overland flow under artificial rainfall intensity

Boussaadi

Mouzai

2021

J GEOGR INST CVIJIC

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Soil erosion depends on a number of factors including rainfall intensity, density of plant cover, and area cover. The objective of this study is to investigate the impact of these factors on flow velocity, overland flow regimes, sediment concentration, and absolute soil detachment. The soil used in this study was sandy remolded agricultural soil. The soil is packed in a tray of 1 m2 fixed on a slope of 3%; five different intensities were simulated under different vegetation cover (density and area). The results indicated that the overland flow velocity with vegetation cover was best described by polynomial function. The mean flow velocity varied from 0.021 to 1.244 m/s. Overland flow regime is subcritical and laminar. However, there are significant relationships between the vegetation cover density and sediment concentration and absolute soil detachment. The sediment concentration ranged from 1.38 to 5.65 kg/m3 whereas the absolute soil detachment ranged from 0.021?10-3 to 1.244?10-3 kg/m2/s. Finally, the vegetation cover presented a good protector to soil sediment from erosion.

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“…At the same time, it is proposed that in the homogeneous hillslopes, the dense herbaceous vegetation cover has resulted in the emergence of some processes which, altogether, decrease the generation of water runoff in the inter-shrub spaces. These processes include: (1) raindrop interception by the dense herbaceous vegetation's shoot (see: Uijlenhoet and Sempere Torres, 2006), with the resultant negated splash impact, mechanical crust formation, soil surface sealing, and water ponding (see: Zhou et al, 2013); (2) the improvement of the surface soil's physical quality through macro-aggregate formation and stability, increased macro-porosity, and tunneling by roots (see: Abu, 2013); and (3) the increased roughness of the ground surface (see: Liu et al, 2010). Moreover, in these deep-soil hillslopes, the herbaceous vegetation seems to compete with the shrubs for moisture which is stored in the relatively deep soil layers.…”

Section: Geo-ecosystem Functioningmentioning

confidence: 99%

Geodiversity decreases shrub mortality and increases ecosystem tolerance to droughts and climate change

Stavi

Rachmilevitch

Hjazin

et al. 2018

Earth Surf Processes Landf

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Mass mortality of shrubs, especially the Noaea mucronata species, has been observed in the semi‐arid Negev of Israel since the early twenty‐first century. This has followed a long‐term drought episode, and suggests a hysteresis‐like effect. However, recent studies have revealed that the mortality has been varied across the region. Therefore, we assessed the depth and stoniness of the soil profile, in homogeneous and heterogeneous hillslopes. Then, we studied the volumetric moisture content during two consecutive growing seasons, in the topsoil of shrubby patches and of inter‐shrub spaces in these hillslopes. The study shows that geodiversity – characterized by shallow soil, a high content of stones in the soil, and a high cover of rock fragment on the surface – reduced shrub mortality. This was attributed to the soil moisture content, which was considerably greater in the heterogeneous hillslopes, than that in the homogeneous hillslopes. It is proposed that the shallow soil halted the growth of herbaceous vegetation in the inter‐shrub spaces of the heterogeneous hillslopes. Therefore, under rainstorms, this hillslope configuration results in considerable generation of overland water flow in the inter‐shrub spaces. The water accumulates in the shrubby patches, allowing them to thrive, even during long‐term dry episodes. In hillslopes with a deep soil layer, no stoniness in the soil profile, and no cover of rock fragments, the herbaceous vegetation is well developed, covering a considerable share of the inter‐shrub spaces. This negates runoff formation and source–sink relations, limiting water availability for the shrubs, and resulting in their mass mortality. Despite no direct pastoral value for livestock, the shrubs play an important role in overall ecosystem functioning. This is due to their capacity to transect hydraulic connectivity, and negate ecosystem collapse. We propose a conceptual model for demonstrating the role played by geodiversity in alleviating drought stress in drylands. Copyright © 2018 John Wiley & Sons, Ltd.

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Efficacy of Grass for Mitigating Runoff and Erosion from an Artificial Loessial Earthen Road

Cited by 30 publications

References 0 publications

Erosion Transportation Processes as Influenced by Gully Land Consolidation Projects in Highly Managed Small Watersheds in the Loess Hilly–Gully Region, China

Erosion Transportation Processes as Influenced by Gully Land Consolidation Projects in Highly Managed Small Watersheds in the Loess Hilly–Gully Region, China

Vegetation cover effects on sediment concentration and overland flow under artificial rainfall intensity

Geodiversity decreases shrub mortality and increases ecosystem tolerance to droughts and climate change

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