Using the SWAT model to identify erosion prone areas and to estimate soil loss and sediment transport in Mogi Guaçu River basin in Sao Paulo State, Brazil

Santos, Franciane Mendonça dos; Pelinson, Natália de Souza; Oliveira, Rodrigo Proença de; Lollo, José Augusto de

doi:10.1016/j.catena.2022.106872

Cited by 20 publications

(10 citation statements)

References 43 publications

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“…Despite these limitations, the SWAT model is still a useful tool for preliminarily understanding watershed-scale runoff and sediment processes [31,32]. It should also be noted that in its specific application, it is necessary to combine the actual situation to reasonably explain and evaluate the model results.…”

Section: Simulation Of Runoff and St In Watershed Based On Swat Modelmentioning

confidence: 99%

Analysis of Spatial and Temporal Characteristics of Runoff Erosion Power in Fujiang River Basin Based on the SWAT Model

Jiang,

Mo,

et al. 2023

Sustainability

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As an erosion dynamic index considering the three elements of flood, runoff erosion power (REP) can better reflect the influence of precipitation, underlying surface, and other factors on the erosion and sediment transport (ST) of flood events. Therefore, it is of great significance to study the variation characteristics of the REP and its relationship with ST in the basin for soil erosion control. In this paper, the Fujiang River Basin (FRB) was selected to analyze the characteristics of runoff and ST at four hydrological stations in the basin from 2009 to 2018, including Santai, Jiangyou, Shehong, and Xiaoheba. Combined with the concept of the REP, six kinds of water–sediment relationship were compared and analyzed. Furthermore, by constructing the SWAT model, the spatial distribution characteristics of runoff, ST, and REP in the FRB were analyzed in depth, and the spatial scale effect of the REP in the basin was explored. The conclusions are as follows: (1) The power function relationship between REP and sediment transport modulus (STM) is better than the other five kinds of water–sediment relationship. (2) Based on the SWAT model, the evaluation indexes of the monthly runoff and ST of the four hydrological stations are credible, good, and excellent in the rating period (RP) and the validation period (VP). (3) The annual REP in the main stream from upstream to downstream is mostly a single change trend, while in each primary tributary, the overall value is larger than that of the main stream and the interannual difference is obvious. The average annual REP generally shows the distribution characteristics of ‘large at the junction of the upper and middle reaches and small in the rest of the area’. With the increase in the control area, the multi-year average REP has a decreasing trend, especially when the catchment area above the sub-watershed is >7318 km2; the change of the multi-year average REP is single and obviously slows down, with an average value of 23.8 mm·m3·s−1·km−2.

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Section: Simulation Of Runoff and St In Watershed Based On Swat Modelmentioning

confidence: 99%

Analysis of Spatial and Temporal Characteristics of Runoff Erosion Power in Fujiang River Basin Based on the SWAT Model

Jiang,

Mo,

et al. 2023

Sustainability

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“…Subsequent to further scouring by concentrated flow at the rill base, the accumulation of overhanging soils escalates, initiating random collapses along the rill walls, thereby augmenting rill width and intensifying sidewall erosion rates, especially in response to slope gradients and the confluence of upstream flows [20][21][22][23][24][25]. Current investigations into pivotal processes governing rill sidewall expansive erosion, notably focusing on rill base scouring and the inception and evolution of tension fissures, remain notably deficient, necessitating extensive in situ observations and model simulations to elucidate their underlying mechanisms and characteristics [26][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

The Collapse Mechanism of Slope Rill Sidewall under Composite Erosion of Freeze-Thaw Cycles and Water

Huang,

Shao,

Liu

et al. 2024

Sustainability

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The composite erosion of freeze-thaw and water flow on slope rills is characterized by periodicity and spatial superposition. When revealing the collapse mechanism of slope rill sidewalls under the composite erosion of freeze-thaw and water flow, it is necessary to fully consider the effect of water migration and its impact on the stability of the rill sidewall. In this paper, we placed the self-developed collapse test system in an environmental chamber to carry out model tests on rill sidewall collapse on slopes under the composite erosion of freeze-thaw and water flow. We utilized three-dimensional reconstruction technology and the fixed grid coordinate method to reproduce the collapse process of the rill sidewall and precisely locate the top crack. We obtained the relationship between the water content of the specimen and mechanical indexes through the straight shear test. The main conclusions are as follows: The soil structure of the rill sidewall is significantly affected by the freeze-thaw cycle, which benefits capillary action in the soil. One freeze-thaw cycle has the most serious effect on the soil structure of the rill sidewall, and the change in the moisture field is more intense after the soil temperature drops below zero. The friction angle of the soil increases with the number of freeze-thaw cycles and tends to stabilize gradually. The effect of the freeze-thaw cycle on the rate of change of the water content of the soil at each position of the wall can be accurately described by a logarithmic function. The expression of the two-factor interaction effect on the rate of change of water content of soil at each position of the rill sidewall can be accurately fitted. We propose a calculation system for locating cracks at the top of the rill sidewall and determining the critical state of instability and collapse of the rill sidewall during the process of freeze-thaw and water flow composite erosion. The results of this research can help improve the accuracy of combined freeze-thaw and water flow erosion test equipment and the development of a prediction model for the collapse of the rill sidewall under compound erosion. This is of great significance for soil and water conservation and sustainability.

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“…Studies show that some agricultural systems or environmental management techniques can potentiate the mitigation of CO 2 emissions to the atmosphere, promoting the maximization of carbon sequestration and stock (C) in the soil (Carvalho et al 2010). These are the systems or techniques considered by conservationists for promoting practices that contribute to the increase of soil organic matter (SOM), such as not disturbing the soil and no-tillage, used in crop succession and no-till systems (NTS) (Risal et al 2022;Santos et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Effect of soil management on carbon stock and soil aggregation in a natural recovery area and surrounding systems, Brazil

Alcântara,

Neves,

Rosset

et al. 2023

Preprint

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This study aimed to quantify total organic carbon (TOC), carbon of humic substances (HS), and their stocks and evaluate the soil structural stability of areas with different uses under sandy loam soil textureSoil samples were collected from three areas and a reference area: Permanent Pasture (PP), No-Till (NT), Private Natural Heritage Reserve in the process of natural regeneration (RPPN) and Native Forest (FN). Dry mass analysis, carbon stock quantification, chemical fractionation of soil organic matter and soil aggregation were carried out. The NF area had the highest deposition of ML. The PP and NT areas had the highest Bd. TOC and Stock-C contents were higher in PNHR, followed by NF, and STRATI was also higher in the regeneration area, and ΔStock-C was positive only in this area. The NT, PNHR, and NF areas had a higher proportion of C-FA than C-HA, but the fraction with the highest representation in all areas was C-HUM. The PP, PNHR, and NF areas obtained the best aggregate stability indicators, such as WMD, GMD, SI, and OLev, as well as a higher proportion of macroaggregates, with the NT area having low aggregate stability. In general, recovery of C contents was observed in recent years in the area of PNHR, leading to a greater storage of C, which shows a quantitative recovery of C in the soil in this area after four years of natural regeneration. Furthermore, the PP and NT areas present a lower capacity for C sequestration, mainly due to the management conditions imposed on the areas.

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Using the SWAT model to identify erosion prone areas and to estimate soil loss and sediment transport in Mogi Guaçu River basin in Sao Paulo State, Brazil

Cited by 20 publications

References 43 publications

Analysis of Spatial and Temporal Characteristics of Runoff Erosion Power in Fujiang River Basin Based on the SWAT Model

Analysis of Spatial and Temporal Characteristics of Runoff Erosion Power in Fujiang River Basin Based on the SWAT Model

The Collapse Mechanism of Slope Rill Sidewall under Composite Erosion of Freeze-Thaw Cycles and Water

Effect of soil management on carbon stock and soil aggregation in a natural recovery area and surrounding systems, Brazil

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