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Showing 1 to 20 of 37 for “"Simulated rainfall"”.
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Analysis of Soil Splash Erosion Under Simulated Rainfall
Threshold energy based on the regression results, required to initiate soil splash, was dependent upon soil type, with greater clay content soils exhibiting a greater threshold energy. Soil splash rate increased with increasing kinetic energy, with large differences between soils. Soil loss …
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A study of storm losses using a laboratory catchment under computer-controlled simulated rainfall
… development of a laboratory catchment and rainfall simulator is described. The rainfall simulator enabled the reproduction of rainfall of any intensity between 0 and 120mm/hr, with properties similar to those of natural rainfall. The rainfall simulator was subsequently linked to a process …
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Effect of Drop Size and Impact Velocity on the Detachment of Soils Under Simulated Rainfall
Made available in DSpace on 2014-12-09T20:03:09Z (GMT). No. of bitstreams: 1 7020930.pdf: 3763884 bytes, checksum: 401b4f04b4c124a0c7da3dc3942f54e0 (MD5) Previous issue date: 1970
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Rice Grain Yield and Nitrogen Uptake and Ammonia Volatilization from Urea as Affected by Urea Amendment and Simulated Rainfall
<p>The effect of rainfall between urea application and flood establishment on N loss and grain yield of rice (Oryza sativa L.) has not been studied. The first research objective was to compare the effects of simulated rainfall amounts and N-(n-butyl) thiophosphoric triamide (NBPT) urease inhibitor …
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Nutrient and Bacterial Transport From Agricultural Lands Fertlized With Different Animal Manures
… to the P requirements of the crop. Three simulated rainfall events were conducted 1, 2 and 35 days after planting of corn. Highest P and N concentrations were observed in the runoff from plots treated with poultry litter, followed by dairy manure and inorganic fertilizer. The poultry …
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Effect of tillage on rainfall infiltration and surface depressional storage
Research to evaluate the effects of tillage on rainfall infiltration and surface depressional storage was conducted. A method that generates infiltration, surface depressional storage, detention storage and hydraulic conductivity from data obtained from small field plots receiving simulated …
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Overland flow on disturbed soil
… of the erodible boundary of tilled soils under simulated rainfall; surface roughness storage and hydraulic resistance of overland flow. Experimental plots, with four types of tillage implemented roughness, were equipped with piezometer sets buried under the surface to measure hydrostatic …
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Simulation of concentration effects on mobility and persistence of alachlor
… kg a.i./ha. Columns were then subjected to a simulated rainfall of constant or variable intensity three times during a two month period. Leachate from the columns was collected twice during each rainfall event. Six times during the two months, columns were analyzed to determine pesticide …
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A poultry litter marker gene correlates with pathogen and indicator bacteria deposition on, growth in and transport from poultry bedding
… applied as fertilizer through soil columns under simulated rainfall. First, deposition studies were conducted to evaluate the deposition rate of microorganisms on poultry bedding during the growth of poultry. The studies were designed to simultaneously evaluate the growth or decay of …
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Role of Vegetation and Environmental Characteristics on Slope Stability in Northwest Arkansas
… toe was constructed to contain soil upon which simulated rainfall was applied. The length of time from the beginning of the simulated rainfall to visible evidence of slope failure was recorded and evaluated using analysis of variance.</p> <p>Significant differences in time to failure were …
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Contaminant removal from impervious pavements and its relationship with raindrop impact energy, cumulative kinetic energy of rainfall events, and rainwater pH
… impact energy, cumulative kinetic energy of rainfall events, and rainwater fit were evaluated. A commercial urban area was chosen to perform simulated rainfall experiments. The runoff from these experiments was collected and analyzed for total suspended solids, volatile suspended solids, …
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Factors Influencing Biotite Weathering
… to assess the influence of different acids, simulated rainfall rates, surface horizons, and temperature on the weathering and cation release of biotite. A field investigation was also conducted on the clay mineral fraction of soils in Grayson County, VA formed above biotite granite. Selected …
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Nitrogen Regime Influence on Nutrient and Sediment Surface Runoff During Vegetative Establishment of Bermudagrass
… at 2, 4, 6, 8, and 10 weeks prior to applying simulated rainfall (WPRS) following N fertilization rates of the ISP or a lower initial N (LIN) rate of 12.2 kg N ha⁻¹ wk⁻¹ the first four weeks and then 48.8 kg N ha⁻¹ wk⁻¹ until full establishment. At the tenth week all treatments were subjected …
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Regionally dissected temperature and rainfall models for the South Island of New Zealand
… study we examine the long term temperature and rainfall trends of the South Island of New Zealand, on a regionally dissected basis. The results are reported on examination of temperature and rainfall data from the South Island of New Zealand, segmented into nine regions, broadly based on NIWA’s …
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Development of Environmental Tracers for Sediments and Phosphorus.
… were then applied to soil boxes receiving simulated rainfall, as well as a field plot, to compare their transport to the relevant phase of phosphorus. The results showed comparable behaviour between REOs and particulate phosphorus. Fluorescent microspheres had low recoveries in surface …
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Particle labeling for sediment source tracking on hillslopes
… and ground based LIDAR, on slope surfaces under simulated rainfall. Laboratory rainfall simulations were conducted sequentially on 24 hr intervals to measure the cumulative effects of rainfall erosivity. Two bare soil plots, plot 1 and plot 2, measuring 3.6 m in length and 0.75 m in width were …
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Investigating the Water Budget and Subsurface Hydrology of Two Rain Gardens in Calgary, Alberta
… from natural precipitation as well as five large simulated rainfall events to evaluate each garden’s performance. Water budgets were developed for both sites across individual precipitation events and entire monitoring seasons, with both gardens having a 100% stormwater runoff removal efficiency …
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Modeling nitrogen transport with the ANSWERS model
… model was verified using water quality data from rainfall simulator plot studies conducted on the Prices Fork Research Farm in Blacksburg, Virginia. The four plots were 5.5 m wide by 18.3 m long with average slopes ranging from 6.2 to 11 percent. Two of the plots were tilled conventionally, and …
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Soil conditions and early crop growth after repeated manure applications
… sites. All soils were treated with a simulated rainfall from a Guelph Rainfall Simulator II. Following the simulated rainfall, crust strength was measured with a hand-held penetrometer. Soil crust strength was measured daily for 10 days as the cores dried. Repeated applications of …
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Evaluating post-fire woody mulch effects on soil and stream nitrogen
… from soil columns by 27% during repeated simulated rainfall events. In hillslope plots, mulching also reduced soil nitrate, with greater impacts following spring snowmelt when N losses from soils to streams was highest. However, the effect of mulching was not measurable at the catchment …
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