Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 25 for “"rainfall simulation"”.
-
Hydrological studies of a laboratory catchment area under rainfall simulation
… the basic nature of hydrological parameters of rainfall, infiltration and surface runoff. Experimental work using a specially designed laboratory catchment and a rainfall simulator is described. This equipment is regarded as a useful contribution to the study of hydrology and its description is …
-
Effectiveness, cost, and implications of forest haul road stream crossing structures and best management practices in Virginia
… and one improved ford. During construction, rainfall simulation was utilized to estimate the sediment contribution of each crossing with minimal BMPs (BMP-), BMPs equal to state recommendations (BMP), and BMPs beyond state recommendations (BMP+). Construction costs were recorded to quantify …
-
Evaluation of Nutrient and Pathogen Losses From Various Poultry Litter Storage Methods
… sheds. The stockpiles were monitored over two rainfall simulation events, in both the Ridge and Valley and the Piedmont physiographic provinces, with both surface and subsurface flows analyzed. An observational study, where subsurface water was sampled for a nine-month period was conducted …
-
The effects of selected corn-soybean tillage systems on rill cross-sectional geometry and soil erosion for two Illinois soils
… the experimental phase of this study, simulated rainfall and additional run-on water were applied to plots that had been subjected to alternative corn-soybean tillage treatments in two soils in central Illinois. Before and after rainfall simulations, a pin type rill meter was used to record soil …
-
Impact of Surface Application of Flue Gas Desulfurization Gypusum on Infiltration, Phophorus Behavior, and Total Sulfur in a Previously Manured Coastal Plain Soil
… Mg ha-1 application rates, however a laboratory rainfall simulation showed no significant effect of FGD gypsum on FIR. Water extractable phosphorus (WEP) decreased by 13-47% one year after application of FGD gypsum. Linear relationships were established between Mehlich 3 (M3) and ammonium oxalate …
-
Estimating Sediment Losses Generated from Highway Cut and Fill Slopes in the Lake Tahoe Basin
… Therefore, understanding the erosion mechanisms (rainfall-runoff and dry ravel), the magnitude of erosion rates and the particle-size distribution (PSD) of the eroded material from these highly disturbed slopes, as well as quantifying the load reductions achieved through slope stabilization …
-
Nitrogen Regime Influence on Nutrient and Sediment Surface Runoff During Vegetative Establishment of Bermudagrass
… 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 to rainfall …
-
Comprehensive investigation of using tire-derived aggregate in chip seal subjected to various traffic and environmental conditions
… research. For this means innovative traffic and rainfall simulation devices were manufactured and used. A 3D macrotexture measurement technique was also developed for chip seal surfaces. The results indicated that up to 50% replacement of mineral aggregate with crumb rubber did not negatively …
-
Impact of Manure Management Practices on the Environmental Fate of Antibiotics in Manure-Applied Fields
… methods, manure application seasons, and manure-rainfall time gaps on antibiotic surface runoff losses, antibiotic distribution and movement in soil, antibiotic dissipation in soil, and development of antibiotic resistance. Rainfall simulation field-scale and soil incubation lab studies were …
-
Modeling and monitoring pathogen transport through vegetated filter strips
… ridge of the lysimeter within 10 minutes of the rainfall initiation. Results from vegetated plots showed that vegetation substantially attenuated surface flow of water as compared to bare plots. Unlike the bare soil, the results showed that the vegetated soil surface created a much less uniform …
-
Role of Vegetation and Environmental Characteristics on Slope Stability in Northwest Arkansas
… 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 observed between …
-
Phosphorus Losses From Simulated Dairy Land Uses of Management Intensive Grazing and Concentrated Animal Feeding Operations
… from each runoff release plot during six rainfall simulation series. Grab samples of runoff were collected and analyzed for dissolved reactive phosphorus, total phosphorus, and total suspended solids. Particulate P (PP) was determined indirectly by subtracting dissolved reactive P (DRP) …
-
Impacts of Land Use and Land Cover Changes, and Climate Variability on Hydrology and Soil Erosion in the Upper Ruvu Watershed, Tanzania
… long term records at the watershed showed that rainfall had significant decreasing trends. At annual scale, climate variability contributed 46% and human activities contributed 54% of the changes in streamflow. Results from the rainfall simulation experiments show upland rice had higher runoff …
-
Impact of Manure Land Management Practices on Manure Borne Antibiotic Resistant Elements (AREs) in Agroecosystems
… application seasons, cropping system, and manure-rainfall time gaps to gauge the impact on AREs in the environment. Two field-scale rainfall simulation studies were conducted along with one laboratory study. Using the injection method lowered concentrations of manure associated AREs entering …
-
Effects of Manure Injection on Transport and Transformation of Nutrient and Antibiotics
… after volatilization, incubation, and rainfall simulation studies. Although these benefits did not translate to higher yields in orchardgrass hay, protein increased when poultry litter was injected, indicating greater N uptake. Injection of dairy manure decreased losses of pirlimycin to …
-
Phosphorus Losses in Runoff from Virginia Soils
… Ridge and Valley were collected and used in a rainfall simulation study. Phosphorus retention among separated clay fractions and whole soils were related to Al bearing minerals such as hydroxy-interlayered vermiculite (HIV), gibbsite, and amorphous Al. Samples dominated by kaolinite retained …
-
Occurrence, Fate and Transport of the Primary Metabolites of Trenbolone Acetate in CAFO Soils and Surface Water Runoff
… these metabolites in feedlot runoff, a series of rainfall simulation experiments were conducted on research feedlots at the University of California, Davis, Animal Science Facility. Soil samples were also collected from a commercial feedlot to assess the occurrence of trenbolone acetate …
-
The influence of land management on upland water quality, notably the production of soluble colour in supply
… treated, burned or limed and then leached using rainfall simulation. Resulting samples were analysed for water quality parameters, including colour, aluminium and iron. Results have enabled those processes which potentially produce colour and the factors governing its magnitude to be addressed …
-
Development of novel lanthanide based particle tracers for rapid monitoring of soil erosion.
… one season (approximately 3 months). A prototype rainfall simulator was developed, designed to simulate the kinetic energy of raindrops on the surface of the soil and used during a series of rainfall simulation experiments. These simulations were performed at two different rainfall intensities (30 …
-
Phosphorus runoff potential of different sources of manure applied to fescue pastures in Virginia
… Forage was cut and removed monthly (n=5). Five rainfall simulations (65-70 mm/h) were conducted at three occasions (June, August, and October); the soil moisture was below field capacity at two events. Continuous surface runoff was collected for 30 min from each plot in accordance with the …
Page 1 of 2