At the hillslope scale, conditions at the surface vary with the topographic positions that can cause different hydrologic regimes and erosion … Erosion rates were proportional to rainfall, and increase with increasing clay content. The total runoff volume was found to be varying with different mulch rates for particular rainfall input and land slope. At plot scale, contradictory results were derived regarding slope e ects on infiltration (e.g., [17,18]) and soil erosion (e.g., [19,20]). The flow regime was always laminar and subcritical. Analysis of variance (ANOVA) was used to determine response of runoff and soil erosion to storm patterns. > rainfall intensity > organic content in the soil. 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). 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 on cultivated land was primarily affected by moisture content, while on uncultivated land, it was mostly affected by slope steepness. One of the key factors affecting temporal variation of soil erosion is rainfall intensity distribution during a storm event. Four storm patterns, each with a different rainfall intensity variation were separated. 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. After applying the rainfall, samples of the non-transported background soil (BS) and the transported sediment (Sf) were collected from the flume surface. Abstract. rainfall moved from the top of a slope to the downslope outlet) than upslope-moving rainfall (i.e. Rainfall events coupled with shallow and gravelly sloping farmland have led to serious soil erosion and associated problems in the Three Gorges reservoir. Main storm characteristics and soil losses were plotted and equation of the line of best fit were selected. 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 runoff distribution pattern was observed to be increasing with the increase in land slope. Runoff sediment (RS) and water (RW) were collected from the outlet. Soil erosion on cultivated land was primarily affected by moisture content, while on uncultivated land, it was mostly affected by slope steepness. Runoff and sediments were negligible in covered plots. 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. Soil erosion induced by rainfall has become one of the major environmental disasters. Slope steepness was an important topographic factor of hillslope rainfall-runo and soil erosion processes. The runoff and soil loss from the Anthrosol surface were generally higher than those from the Calcaric Cambisol surface. 11cm/h, 13cm/h and 14.65cm/h at 0%, 2% and 4% land slopes were selected. Rainfall intensity, slope and antecedent moisture explained 84–89 and 59–66% of the variation in runoff and soil loss, respectively. rainfall-runo and soil erosion processes. de Lima and Singh, 2003, de Lima et al., 2008). The rainfall was applied in four events of 15 min each with a total amount of rainfall of 15 mm during each event. kg− 1) was applied to two soil-flumes with slope percentages of 20% and 10%. (1988) compared the effects of six different rainfall patterns on runoff and soil … The main objective of this study was to investigate the effects of soil type and rainfall intensity on sheet erosion processes (hydrological, erosional processes and sediment characteristics) from temperate to … 1- Expérimentation de nouveau matériaux dans les procédés d 'épuration. rainfall moved from the downslope outlet to the top of a slope) (e.g. The AgNPs concentration in the runoff sediments increased with subsequent applied rain events. Mathematical relationships were developed for relating sediment outflow rate, sediment concentration, land slope and rainfall intensity for a particular mulch treatment. 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. By continuing you agree to the use of cookies. If soils get saturated with water after prolonged periods of intensive rain, their capacity to absorb water decreases. EFFECT OF SOIL TEXTURE, SLOPE GRADIENT AND RAINFALL INTENSITY ON RUNOFF AND EROSION 4.1 Introduction Soil erosion by water occurs due to complex interactions of sub processes between detachment and transport of soil materials. 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. Rainfall amount and intensity were recorded every 24 hours, while sheet erosion was measured from four tillage systems (Conventional Tillage (CT), Mulch Ripping (MR), … Therefore, in bare plots, although sediment yield was generally low, averaging 74+/-43 kg ha(-1), the mean of runoff achieved a coefficient of 35%, this magnitude has to be taken into consideration in this region verging on aridity. 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 . The interrill erosion mechanism is becoming clearer, and process-based models are becoming more accurate. February 2017; DOI: 10.13140/RG.2.2.26247.39841. Rains around 13.5 J m(-2) mm(-1) of kinetic energy are quite frequent in the study area (34% of recorded rains en 12 years). 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). May also be blocked, and soil loss https: //doi.org/10.1016/j.iswcr.2015.10.001 1996 ) to erosion get saturated water. Lima et al., 2008 ) water Conservation Research, https: //doi.org/10.1016/j.iswcr.2015.10.001 and... After prolonged periods of intensive rain, their capacity to absorb water decreases with subsequent applied rain.. 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