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.
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Showing 1 to 19 of 19 for “"Tile Drains"”.
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Fully-coupled physically-based approach for modeling conventional and managed subsurface drainage
… hydrology model HydroGeoSphere to the real tile-drained farmlands in Indiana and Illinois yields a new tile drain module that can simulate both the conventional and managed drainage practices. The new tile drain module features the embedded node method for integrating tile drains into the …
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A comparison of field methods of measurement of the water table drawdown characteristics between lateral tile drains in Brookston clay loam soil and an evaluation of an empirical formula for placing lateral drains
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Agricultural Engineering, 1953
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Comparison Of Denitrification Potential Around A Tile Drain And In Aquifer Sediments: Oakes, ND
… reduction may cultivate within the tile drainage. This study aims to quantify and compare the potential for denitrification, as well as denitrification rates, within tile drainage and aquifer sediments at the Best Management Practices (BMP) site, within the Oakes Irrigation Test Area …
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Comparison of Heterotrophic Activity in Forested Streams Originating from Wetland and Agricultural Tile Drainage Sources
… headwater streams being sourced by agricultural tile drains instead of wetlands. Tile drainage inputs can influence stream conditions (i.e., temperature, hydrology, and water chemistry) that are important drivers of ecological function. To assess the influence of agricultural tile drainage inputs …
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Modeling and measurement of tile drain controls in intensively managed landscapes
Tile drains are widely used in the Midwestern United States to improve the productivity of poorly drained agricultural fields. Since a tile drain reduces vadose zone soil moisture by lowering the water table, and its outlets feed directly into streams and ditches, tile flow can affect various …
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Development of DRAINMOD-based VBA model for evaluating drainage system response
… to determine the optimal depth and spacing of tile drains that maximize crop yield for corn and soybean during the mid and late 21st century. Results show a steady decline in crop yield due to extreme heat stress. For the counties analyzed, a shallow tile depth corresponded with a higher yield …
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Connectivity dynamics and its impact on material flux and transformations in a watershed
… five different soil regions, agricultural tile drainage, and four different vegetation types that include bioenergy crops. It was found that tile drains, soil texture, and vegetation type are the dominant determinants of the hydrological responses of the field, giving rise to spatiotemporal …
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Valuing critical zone services in intensively managed landscapes
… summing the mechanical energy used to construct tile drains, fertilizer, and other processes involved in IML and the chemical energy gained by the production of ethanol from corn. Multi-layer soil, canopy, and nutrient models are coupled to compute water, carbon, and nitrogen fluxes, which can be …
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Predicting the Downstream Impacts of Headwater Burial in Kemptville Creek Watershed (Ontario) Using the SWAT Model
… use change or management. Rerouting streams into tile drains, canals, non-perforated pipes and paving over, are all examples of stream burial. This study explores the importance of delineating headwater streams within a watershed hydrological network and the downstream impacts of headwater burial. …
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Water Flow and Chemical Transport in a Subsurface Drained Watershed
Tile-drainage in the Corn Belt has a great impact on surface water quality, at all scales (field, watershed and drainage basin) especially by increasing nitrate loads in the Mississippi River. An improved understanding of flow and transport is essential to better manage these ecosystems. However, …
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Synthesis of climate-water-food nexus in Illinois – data analysis and modeling
… of the central Illinois, an upgrade in tile drainage systems in the 1970s, followed by the intensification of the cropping density in the recent decades have been identified to have driven a change in runoff processes from the land surface and tile drains. The next step in the …
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Old and subsurface water contributions to storm runoff generation in flat, fractured, clayey terrain.
… monitoring wells, subsurface collection pits, tile drains and surface runoff collecting systems. Isotopic (oxygen-18 "$\sp{18}O'')$ and chemical (electrical conductivity "EC", chloride "Cl$\sp-''$ and dissolved silica "SiO$\sb2'')$ parameters were utilized in a two-component mixing model or the …
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Nitrate and Ammonium Transformation and Fate in Groundwater of an Agricultural Watershed: An Isotope and Geochemistry Approach
… zone, as sampled in the lysimeters and tile drains reached over 30 ppm-N, concentrations in groundwater were typically <10 ppm-N, and most often <0.5 ppm-N in the bedrock aquifer. The attenuation of high ammonium concentrations in soil water was attributed to plant uptake prior to …
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Microbial community dynamics in denitrifying biofilters receiving agricultural drainage
Subsurface drains (tile drains) used to augment drainage in agricultural fields serve as a major pathway for agricultural nitrate pollution to enter surface waters. Used primarily in the Midwestern United States, nitrates from tile drainage systems contribute to eutrophication within the Gulf of …
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Fate of 17α-Estradiol, 17β-Estradiol, and Estrone in Agricultural Soils and Sediments
… management strategies, including controlled tile drains and bioreactors, where an anaerobic environment conducive to these transformations may be an unintended consequence.</p>
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Characterizing transient and seasonal responses of bioreactors for subsurface drains
… reduce nitrates and phosphates from subsurface (tile)-drained farmlands. The use of fixed-bed, in-field tile bioreactors is one such practice being investigated. In-field bioreactors are trenches filled with carbon material (usually wood chips) which serve as a medium for denitrifying bacteria to …
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Dynamics of inorganic soil-nitrogen age in intensively managed landscape
… applications and installation of subsurface tile drainage network, further complicate our ability to characterize the dynamics of nitrogen in the soil. Specific interpretation methods are thus required to gain a better understanding of the transformation and transport properties of soil …
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Diagnostic analysis of runoff partitioning at the catchment scale
… studied at an agricultural basin with extensive tile drains, The Upper Sangamon River basin located in central Illinois. It is found that there is a carry-over of nitrogen storage from dry years to wet years, and this is mainly caused by the loading of NO3-N from the hillslope to the channel by …