KINEROS2-based simulation of total nitrogen loss on slopes under rainfall events

An, Miaoying; Han, Yanni; Xu, Lei; Wang, Xiuru; Ao, Chang; Pang, Danbo

doi:10.1016/j.catena.2019.01.039

Cited by 23 publications

(11 citation statements)

References 41 publications

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“…These models were adopted to simulate the nutrient transfer process with ponding under rainfall conditions and the ensemble Kalman filter model was used to eliminate errors in the experimental observation data. Therefore, models based on mixed layer theory have been widely used in predictions of nutrient transfer on slopes because of their clear physical meaning (An et al, 2019;Tong & Yang, 2008;Yang et al, 2016c;Yang, Wang, Xu, & Lv, 2015).…”

Section: Core Ideasmentioning

confidence: 99%

“…Figure 4 shows that the surface runoff presented a rapid upward trend for a period of time after the start of runoff, then had a steady trend of slow growth. This was predominately caused by the dispersion of tiny particles that blocked up the soil pores, accompanied by raindrop splashes that compacted the surface soil, thereby reducing the soil infiltration capacity (Ao et al, 2019). The SE of the measured runoff values of all five rainfall intensities ranged across 0.01 to 0.16, 0.01 to 0.16, 0.10 to 0.41, 0.13 to 0.71, and 0.23 to 0.69 respectively for intensities of 30, 45, 60, 75, and 90 mm h -1 .…”

Section: Analysis Of Runoff and Sediment Yieldmentioning

confidence: 99%

“…It should be noted that the deeper the exchange layer, the more exchangeable nutrients enter the runoff. The larger the e r , the stronger the raindrop splashing effect, which caused the surface soil to crust and reduced the amount of nutrients ejected into runoff (Ao et al, 2019). Therefore, the larger the d e , the larger the peak nutrient loss rate and the larger the e r , the steeper the curve of the nutrient loss rate in the decreasing stage.…”

Section: Parameter Sensitivity Analysis and Model Applicabilitymentioning

confidence: 99%

“…Lv, Luo, and Xie (2019) concluded that the rock fragments in the spoil pile reduced soil loss by 35.23 to 76.84%. Ao et al (2019) found that the deposition rate of runoff and N loss increased with the diameter of the raindrops; after the addition of polyacrylamide, the loss of runoff, sediment, ammonia-N, and nitrate-N is greatly reduced; as the amount of polyacrylamide applied increased, the loss of sediment and nitrate-N declined. Water migration and clay soil loss are cardinal causes of soil nutrient transport, which is a complex physical and hydrodynamic process.…”

Section: Introductionmentioning

confidence: 97%

“…Soil erosion and chemical migration from surface soil to runoff under rainfall conditions are major causes of farmland fertility degradation and agricultural nonpoint source pollution (Wang & Wang, 2010). Often, the levels of sediment and nutrient loss caused by a heavy rain can reach >50% of the annual values in the Loess Plateau (Ao et al, 2019;Haster & James, 1994;Tao, Wang, & Lin, 2018).…”

Section: Introductionmentioning

confidence: 99%

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An approximate semi‐analytical model of sediment and nutrient transport on slopes under rainfall conditions

Shao

et al. 2020

Soil Science Soc of Amer J

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Under natural rainfall, the surface runoff erosion of sloping farmland tends to remove large quantities of soil particles and constitutes nonpoint source pollution. The existing sediment and nutrient loss models focus on estimating the total amount of pollutants in the long term. The Existing mathematical models that describe the nutrient loss process on slopes have some shortcomings, which have not accounted for the effect of infiltration on nutrient concentrations in the exchange layer before runoff starts. Here, an approximate semianalytical model of sediment yield and nutrient loss was based on surface runoff processes. Simulated rainfall experiments were performed to calibrate the model's parameters and verify its reliability. The established model incorporated raindrop splashing, diffusion, and water infiltration effects on nutrient transfer in the exchange layer. Raindrop splashing played a leading role in nutrient translocation from the exchange layer to runoff. The simulated runoff, sediment, and nutrient matched their measured values reasonably well (R2 > 0.8; Nash–Sutcliffe efficiency > 0.347). The model's sediment yield items were more sensitive to runoff erosion than splash erosion. The raindrop‐induced water transfer rate in the nutrient loss simulation dramatically affected the peak nutrient loss rates, whereas the depth of the exchange layer clearly affected the overall range of change in nutrient loss rate and boosted the total nutrient loss. Therefore, measures such as vegetation coverage or deep fertilization should be adopted to weaken raindrops’ kinetic energy and reduce nutrient concentrations in the exchange layer to prevent agricultural nonpoint source pollution in the Loess Plateau.

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Section: Core Ideasmentioning

confidence: 99%

Section: Analysis Of Runoff and Sediment Yieldmentioning

confidence: 99%

Section: Parameter Sensitivity Analysis and Model Applicabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An approximate semi‐analytical model of sediment and nutrient transport on slopes under rainfall conditions

Shao

et al. 2020

Soil Science Soc of Amer J

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Soil erosion and nutrient loss due to changes in rainfall intensity under different wind directions

Chen

et al. 2023

Earth Surf Processes Landf

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In nature, wind often occurs simultaneously with rainfall, causing nutrient loss in soil and water on slopes. However, the influence of different rainfall intensities combined with different wind directions on soil erosion and nutrient loss remains unclear. This study utilized wind‐driven rainfall laboratory flume experiments to analyse the influence of different wind directions (windward, leeward and crosswind) and rainfall intensities (30, 60 and 90 mm h−1) with constant wind speed (5 m s−1) on slope runoff, sediment yield and the associated losses of different forms of N ( , ) and P ( ‐P). The response of soil erosion, N and P loss to rainfall changes with different wind directions. When the rainfall intensity was constant, runoff, sediment yield and sediment‐associated total nitrogen (TN) and total phosphorus (TP) losses on slopes showed a trend of leeward > crosswind > windless > windward, whereas runoff‐associated TN and TP losses showed a trend of windward > crosswind > windless > leeward. Runoff, sediment yield and sediment‐associated TN and TP losses on leeward slopes were 1.09–1.17, 1.25–1.44, 1.33–1.62, and 1.40–1.66 times than windless slopes. Moreover, with constant wind direction, the runoff, sediment yield and associated N and P losses increased significantly with increasing rainfall intensity. When the rainfall intensity increased from 30 to 60 and 90 mm h−1, the runoff, sediment yield and associated TN and TP losses increased 2.02–2.28, 3.65–5.35, 3.96–34.39 and 4.28–8.45 times, respectively. The effects of rainfall on soil erosion and nutrient loss were significantly greater than those of wind. The loss of different forms of N and P associated with runoff and sediment was consistent with that of TN and TP losses. However, with an increase in rainfall intensity, the growth rates of runoff, sediment yield and associated N and P losses exhibited a gradually weakening trend for all wind directions. An increase in rainfall intensity enhanced the vertical vector force of wind‐driven rainfall, which increasingly decreased the angle between the rain incidence and the normal line of the horizon; therefore, the direction of the rain erosion force gradually approached that of windless conditions.

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Field studies on the influence of rainfall intensity, vegetation cover and slope length on soil moisture infiltration on typical watersheds of the Loess Plateau, China

Jia

Liu

et al. 2020

Hydrological Processes

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Soil moisture is a key process in the hydrological cycle. During ecological restoration of the Loess Plateau, soil moisture status has undergone important changes, and infiltration of soil moisture during precipitation events is a key link affecting water distribution. Our study aims to quantify the effects of vegetation cover, rainfall intensity and slope length on total infiltration and the spatial variation of water flow. Infiltration data from the upper, middle and lower slopes of a bare slope, a natural grassland

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KINEROS2-based simulation of total nitrogen loss on slopes under rainfall events

Cited by 23 publications

References 41 publications

An approximate semi‐analytical model of sediment and nutrient transport on slopes under rainfall conditions

An approximate semi‐analytical model of sediment and nutrient transport on slopes under rainfall conditions

Soil erosion and nutrient loss due to changes in rainfall intensity under different wind directions

Field studies on the influence of rainfall intensity, vegetation cover and slope length on soil moisture infiltration on typical watersheds of the Loess Plateau, China

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