AgNPs were detected in all samples collected. The total runoff volume was found to be varying with different mulch rates for particular rainfall input and land slope. Therefore, understanding the effects of rainfall intensities on soil nutrient and sediment transportation from farmland via surface runoff is important. The study sought to quantify the effect of rainfall characteristics on sheet erosion and maize grain yield under different tillage systems. Field-saturated hydraulic conductivity, soil penetration resistance, and bulk density were recorded periodically in portions … Mathematical relationships were developed for relating sediment outflow rate, sediment concentration, land slope and rainfall intensity for a particular mulch treatment. The interrill erosion mechanism is becoming clearer, and process-based models are becoming more accurate. Rhéologie des suspensions à base de lœss en vue l’obtention d’un nouveau matériau, Transport of silver nanoparticles by runoff and erosion – A flume experiment, Effet De La Pluie Sur Le Ruissellement Et L’érosion Dans Un Sol Remanie Végétalisé, Organic Mulch Effects on Runoff and Sediment under Simulated Rainfall Conditions, Effect of Rainfall Intensity, Soil Slope and Geology on Soil Erosion. Soil moisture content and organic matter make up are some of the soil component aspects that determine erosivity of wind or rainfall. The study confirms that AgNPs can be transported by both overland flow and sediment due to erosion. (1988) compared the effects of six different rainfall patterns on runoff and soil … Erosion rates were proportional to rainfall, and increase with increasing clay content. The consequences of soil erosion are primarily centered on reduced agricultural productivity as well as soil quality. Erosion agents and patterns profoundly affect hillslope soil loss characteristics. Main storm characteristics and soil losses were plotted and equation of the line of best fit were selected. Production and hosting by Elsevier B.V. International Soil and Water Conservation Research, https://doi.org/10.1016/j.iswcr.2015.10.001. Soil Erosion- Causes and Effects. Higher concentrations of AgNPs in soil were detected in the BS than in the Sf likely due to the BS having more fine particles (silt and clay). The quantity of these three types of mulches were taken as, 6 ton/ha, 8 ton/ha and 10 ton/ha and for each mulch treatment, three rainfall intensities viz. At the hillslope scale, conditions at the surface vary with the topographic posi-tions that can cause different hydrologic re-gimes and erosion (Huang et al. Starting with the minor soil disruption caused by the impact of falling raindrops, splash erosion moves around small particles in the upper soil layer. The rainfall was applied in four events of 15 min each with a total amount of rainfall of 15 mm during each event. Effect of Subsequent Simulated Rainfalls on Runoff and Erosion cant for percolation, runoff, and splash at P = 0.001, 0.001, and 0.05, respectively. Soil erosion poses a major threat to the sustainability of natural ecosystems. Effect of tillage, slope, and rainfall on soil surface microtopography quantified by geostatistical and fractal indices during sheet erosion Na Ta tana0214@163.com 1 , Chutian Zhang zhangchutian@nwafu.edu.cn 1 , Hongru Ding dinghongru@nwsuaf.edu.cn 2 and Qingfeng Zhang zhqf@nwsuaf.edu.cn 1 These effects were significantly different from those in the USLE (Universal Soil Loss Equation), which underpredicted erosion at low slopes. Four storm patterns, each with a different rainfall intensity variation were separated. 1- Expérimentation de nouveau matériaux dans les procédés d 'épuration. The soil critical shear stress, rainfall intensity, and temporal patterns have great influences on the slope effect trend, while the other soil erosion parameters, soil type, hydraulic conductivity, and antecedent soil moisture have minor impacts. The effects of rainfall intensity and slope gradient on runoff, soil loss and rill development were different for the two soils. However, concentration varied according to sample type (soil or water), time of collection (for runoff water and sediment) and the slope of the soil flume. It was observed that values of sediment outflow rate and average sediment concentration had a good correlation with rainfall intensity and land slope for each mulch treatment. The results show that the soil erosion rate in areas of metamorphic rocks shows a marked increase compared with areas of steep slope and sedimentary rocks. The duration of rainfall was fixed (10 minutes) for every mulch treatment. At plot scale, contradictory results were derived regarding slope e ects on infiltration (e.g., [17,18]) and soil erosion (e.g., [19,20]). However, neither the main effect of the soil type for runoff nor the effect of the interaction between the subsequent rainfall and the soil type for percolation was found to be significant at the Statistical analysis revealed significant differences in total runoff, soil loss and sediment concentration across four storm patterns (P<0.001) but no differences in the runoff coefficient. Rainfall intensity, slope and antecedent moisture explained 84–89 and 59–66% of the variation in runoff and soil loss, respectively. de Lima and Singh, 2003, de Lima et al., 2008). However, few attempts have been made to analyze the effects of rainfall and inflow on soil erosion for hillslopes dominated by sheet erosion or rill erosion in the Chinese Mollisol region. If soils get saturated with water after prolonged periods of intensive rain, their capacity to absorb water decreases. Analysis of variance (ANOVA) was used to determine response of runoff and soil erosion to storm patterns. Soil erosion and runoff generation from a field or a basin depend on several parame-ters, such as climate, soil characteristics, rainfall depth and intensity, and slope mor-phology. The dominant sub processes vary according to whether the source area is rill or interrills (Bradford and Huang, 1996). We use cookies to help provide and enhance our service and tailor content and ads. As rainfall continues, the storage of the furrow is exceeded by the volume of rainfall and runoff will overflow the furrow. At the hillslope scale, conditions at the surface vary with the topographic positions that can cause different hydrologic regimes and erosion … Higher rainfall intensity produced less runoff and more sediment for almost each treatment. One of the key factors affecting temporal variation of soil erosion is rainfall intensity distribution during a storm event. In addition, increasing the slope of the flume from 10% to 20% increased the total AgNPs transported with the runoff sediment by a factor 1.5. Soil erosion on cultivated land was primarily affected by moisture content, while on uncultivated land, it was mostly affected by slope steepness. Flanagan et al. A laboratory rainfall simulation study was conducted on an Ultisol from subtropical China to investigate the effect of rainfall kinetic energy on crusting, infiltration, runoff, and erosion. The close relationship between water erosion and rainfall intensity is due to: (1) impact of raindrops on soil surface in high-intensity storms causes increased soil particle detachment (Van Dijk, Bruijnzeel, & Rosewell, 2002); and (2) higher rainfall intensity results in higher rates of infiltration excess runoff, and a much greater transport of suspended sediment load . Previous studies have shown that the use of vegetation is an effective way to control soil erosion. agricultural sandy soil (82.22% sand, 11.57% silt and 7.21% clay). The AgNPs concentration in the runoff sediments increased with subsequent applied rain events. Soil erosion processes during a storm are strongly affected by intra-storm variations in rainfall characteristics. Rainfall events coupled with shallow and gravelly sloping farmland have led to serious soil erosion and associated problems in the Three Gorges reservoir. Plastic rods were used to simulate the plants at different densities: 0 stem/m2 (bared soil), 126 stems/m², 203 stems/m², 461 stems/m² and 2500 stems/m²). > rainfall intensity > organic content in the soil. Secondly, rainfall regimes had an important effect on runoff and soil loss under different land uses. Soil erosion induced by rainfall has become one of the major environmental disasters. After each erosive rainfall (12 events), Runoff and suspended sediment samples were collected in each plot׳s tank which is located on hillslopes of the basin of Khamsan. However, effects of long‐term located experiment of RFRH on soil erosion and soil quality in sloping farmland are not well understood. Also a strong non-linear relationship was found between different quartiles of storm and soil loss. If we would consider the usual lower limits from the literature, we would be ignoring an important percent of natural rainfall episodes. The storm patterns were: (1) increasing rainfall intensity (2) increasing then decreasing intensity (3) decreasing intensity (4) decreasing then increasing intensity. The sediment outflow rate for no mulch treated land was higher as compared to mulch treated lands. The lowest runoff coefficients and the highest soil loss in regime 2 were found in shrub and forest land, respectively, which differed from that of regime 1. Therefore, an artificial, simulated rainfall experiment study is conducted to determine the effect of rainfall intensity and vegetation cover on runoff volume, sediment load, and runoff hydraulics characteristics. impact of rainfall patterns on erosion processes has become a popular research subject in recent years. Rainfall simulation... Conference: Colloque International sur la vulnérabilité des sols méditerranéens à l’érosion hydrique dans un contexte de changement global. Keys words __ rain intensity, overland flow, soil erosion, vegetation, selected land slopes under simulated rainfall conditions by using rainfall simulator of size 10 m × 1.2 m × 0.5 m with the locally available soil material in Pantnagar. The results revealed the efficiency of vegetation cover reducing runoff and sediments. Higher rainfall intensity produced less runoff and more sediment for almost each treatment. Rainfall kinetic energy plays an important role in breaking down aggregates and forming crusts. rainfall moved from the downslope outlet to the top of a slope) (e.g. It was carried out under semiarid conditions and infertile sandy soils of Zimbabwe. Soil erosion on cultivated land was primarily affected by moisture content, while on uncultivated land, it was mostly affected by slope steepness. kg− 1) was applied to two soil-flumes with slope percentages of 20% and 10%. 11cm/h, 13cm/h and 14.65cm/h at 0%, 2% and 4% land slopes were selected. This impact is even more severe in poorer areas, where farmers often opt to raise row crops, which are particularly susceptible to the effects of soil erosion, putting them more at risk. Laboratory studies on soil flume have shown that peak discharge and erosion rate are higher under downslope-moving rainfall (i.e. Therefore, the soil erosion rate increases strongly with increasing organic content and clay content. 1. During the investigation (November 2016–October 2018), soil water content, rainfall, runoff, and soil erosion were continuously monitored. Rainfall intensity plays a dominant role in soil erosion, while rainfall accumulation is the main influencing factor for runoff. Abstract. Results showed that in lower rainfall intensities a linear function fits the relationship between soil loss and rainfall intensity whereas this function tends to be non-linear at higher intensities. The results showed that the upslope-moving rainfalls generated more surface flow from 25% to 700% and less soil erosion than the downslope-moving rainfalls in the dry runs due to the different spatial developing processes of soil surface sealing. Rainfall amount and intensity were recorded every 24 hours, while sheet erosion was measured from four tillage systems (Conventional Tillage (CT), Mulch Ripping (MR), … In semiarid regions, rainfall is one of the primary factors affecting soil erosion and crop production under rain-fed agriculture. Then, the furrow ridge will collapse under the impact of both rill and interrill erosion, which may weaken the conservation capacity or even enhance soil erosion. Keywords: Rainfall simulator, Mulch, Sediment outflow, Runoff, Pantnagar. ... is vulnerable to soil erosion due to heavy rainfall, its high elevation and undulating terrain. Soil erosion during rainfall is a complex phenomenon resulting from soil detachment by raindrop impact and surface flow, and transport of particles by rain splash and surface flow (Ellison, 1944, Ellison, 1945).To distinguish between the dominant processes involved in soil loss, upland erosion has been divided into rill and interrill erosion (Meyer et al., 1975). Slope steepness was an important topographic factor of hillslope rainfall-runo and soil erosion processes. By continuing you agree to the use of cookies. Soil erosion and runoff generation from a field or a basin depend on several parameters, such as climate, soil characteristics, rainfall depth and intensity, and slope morphology. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Neglecting the slope effect on infiltration would generate Runoff sediment (RS) and water (RW) were collected from the outlet. Runoff and sediments were negligible in covered plots. In particular, storms with increasing rainfall intensity yielded highest quantities of eroded sediments, total runoff and highest sediment concentrations followed by increasing then decreasing, decreasing then increasing and decreasing intensity, respectively. Effects of Soil Erosion. This study showed that soil and water conservation management can have a positive effect on runoff and sediment reduction, and traditional sloping farmland should be reconstructed. The effects of slope, s, (m/m) and maximum 30 min rainfall intensity, I 30, (mm/h) were significant at the 0.1% level for the 11 storms studied. Erosion and associated problems in the USLE ( Universal soil loss and rill were! In the USLE ( Universal soil loss from the Anthrosol surface were generally higher than from. With shallow and gravelly sloping effect of rainfall on soil erosion are not well understood et al., 2008 ) soil in... 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