Gully erosion

Purpose Gully erosion is the most serious form of soil degradation that occurs in agricultural areas. Gully head retreat is an essential process in gully erosion. In some respects, gully head activity reflects gully head retreat. This paper aims to present a method for quantifying gully head activity, understanding the effects of its influencing factors and analyzing the relationship between gully head activity and gully growth rates. Materials and methods Based on a field survey of 80 gully heads in five small watersheds, hilly-gully region of the Loess Plateau, this study introduced a gully head activity index (GAI) and calculated it with a semiquantitative method, which employs seven indicators. Theoretically, the GAI ranges from 1 to 3, and the larger the GAI is, the more active the gully head is. Pearson correlation coefficients ( r) were used to evaluate the individual relationships between the GAI and upslope drainage area, upslope length, vegetation coverage, and slope aspects. One-way ANOVA was used to compare the GAI in different vegetation types, soil and water conservation measures (SWCM). Finally, Pearson’s correlation was used to evaluate the relationships between gully growth and the GAI. Results The GAIs of 80 gully heads ranged from 1.122 to 2.943, with an average value of 1.765. Positive correlations with the GAI were found for both upslope drainage area and upslope length. There was a significant negative correlation between vegetation coverage and the G...

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Recent Examples on the Web Schwarzmann and Berghoff call the search for visible signs of pollution such as gully erosion — as opposed to measuring water pollutants — an unscientific way to evaluate logging’s impact. — Tanka Dhakal, Journal Sentinel, 5 Sep. 2022 These examples are programmatically compiled from various online sources to illustrate current usage of the word 'gully erosion.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors.

Abstract Considering the devastating menace of gully erosion for which lithology is one amongst several other agents that drives soil loss and gully erosion, Vertical Electrical Sounding (VES) and Electrical Resistivity (ERT) techniques were adopted to investigate subsurface lithology in Iguosa gully erosion site. PASI 16GL model resistivity meter was used in acquiring data for VES and ERT in the area under investigation. VES data acquired were processed both qualitatively and quantitatively, and geoelectric sections were generated using AUTOCAD software by combination of two or more interpreted VES results along a profile. ERT data were processed using Res2dinv software to an inverse model resistivity section. The geoelectric image generated were interpreted to obtain lithology of the subsurface. The analysis and interpretation of the subsurface image reveals presence of topsoil, sand, dry sand, clayey sand and coarse sand. The subsurface lithology within the study location is predominantly sandy. The result obtained from the resistivity of all profiles shows that erodibility increases with depth within this study area with corresponding high resistivity values. Due to the fact that sand within the study area is loose coarse and silty, which can give rise to high resistivity and causes erosion. AJOL is a Non Profit Organisation that cannot function without donations. AJOL and the millions of African and international researchers who rely on our free services are deeply gr...

Sheet Erosion Sheet erosion is the uniform removal of soil in thin layers, and it occurs when soil particles are carried evenly over the soil surface by rainwater that does not infiltrate into the ground. From: Horse Pasture Management, 2019 Related terms: • Agricultural Science • Soil Erosion • Soil Degradation • Soil Water • Cropland • Universal Soil Loss Equation • Water Erosion • Gully Erosion • Rill Erosion M.A. Stocking, in International Encyclopedia of the Social & Behavioral Sciences, 2001 3Land Degradation: Biophysical Processes Land degradation is usually described by the natural resource that is being depleted (e.g., soil/vegetation/environmental degradation) or the biophysical process by which it operates (e.g., soil erosion by wind or water, sodication, salinization, deforestation). In all these processes of environmental change, the soil is normally seen as the focal resource that diminishes in quality with land degradation. As vegetation degrades in quantity and species composition, for example, the soil changes chemically, physically, and biologically. A vicious cycle is evident in most degradation processes: as the soil degrades, so is its ability to support plant growth or other life-support functions. In soil degradation six processes usually are recognized: (a) Water erosion . This includes the splashing of soil particles by raindrop impact; sheet erosion whereby a layer of topsoil is removed by flowing water; and gully erosion where a channel is formed...

• GIS Applied to Soil-Agricultural Health for Environmental Sustainability • 27 July 2022 Gully erosion vulnerability modelling, estimation of soil loss and assessment of gully morphology: a study from cratonic part of eastern India • ORCID: orcid.org/0000-0002-0575-1503 • ORCID: orcid.org/0000-0002-2825-7794 • • … • Show authors Environmental Science and Pollution Research ( 2022) A highly visible form of soil erosion is gully, a significant geomorphological feature, resulting from water erosion and causing land degradation and deterioration. In arid and semi-arid environment, gully erosion is conceived as an important source of sediment supply washing out the top fertile soil and exposing lower soil layers. The present study is conducted on the lateritic terrain of Rupai watershed of eastern plateau fringe of India, where water erosion is a serious concern. In order to prepare a gully erosion vulnerability mapping, the analytical hierarchy process (AHP) model coupled with geospatial technology is adopted taking into account thirteen bio-physical factors. It is revealed that around 49% area of the watershed belongs to high to very high gully erosion vulnerability zone (GEVZ) followed by moderate risk zone of 31.64%. This model is validated performing an accuracy assessment, which is calculated to be 90.91%, and the value of Kappa co-efficient is 0.86. It is imperative to estimate the average annual soil loss alongside of delineating GEVZ; thus, the revised universal soil ...

1 2 Gully erosion prediction tools can lead to better land management Date: November 23, 2022 Source: University of Illinois College of Agricultural, Consumer and Environmental Sciences Summary: Soil erosion is a significant problem for agricultural production, impacting soil quality and causing pollutants to enter waterways. Among all stages of soil erosion, gully erosion is the most severe phase, where large channels are carved through the field. Once gullies develop, they are challenging to manage through tiling; they require a more comprehensive approach along the impacted area. Researchers have now developed a modeling framework that uses remote sensing environmental data to predict gully erosion susceptibility more accurately. This predictive model allows landowners and conservation agencies to direct management resources to the most vulnerable areas. Share: Soil erosion is a significant problem for agricultural production, impacting soil quality and causing pollutants to enter waterways. Among all stages of soil erosion, gully erosion is the most severe phase, where large channels are carved through the field. Once gullies develop, they are challenging to manage through tiling; they require a more comprehensive approach along the impacted area. University of Illinois researchers developed a modeling framework that uses remote sensing environmental data to predict gully erosion susceptibility more accurately. This predictive model allows landowners and conservation a...