منابع مشابه
Modeling of Water Flow and Nitrate Transport to Subsurface Drains
In this study, the water flow and nitrate transport to a subsurface drain, using a simplified and detailed model, are simulated for the specific hydro-geological conditions of Elverdinge and Assenede, Belgium. Previously, the DRAIN MOD-N model proved to be able to simulate nitrate concentrations and drainage well for an in-situ leaching experiment, the “Hooibeekhoeve” in the community of Geel (...
متن کاملDeducing Subsurface Property Gradients from Surface Wave Dispersion Data
My talk deals with the same subject as that of the previous speaker, Dr. Szabo, except I am not going to assert that it involves residual stresses necessarily. I consider some kind of a perturbation of the elastic properties and/or density due to some kind of surface treatment. As in all problems of this kind I assume, at least for the time being, some kind of an ansatz about mutual proportiona...
متن کاملEscherichia coli transport from surface-applied manure to subsurface drains through artificial biopores.
Bacteria transport in soils primarily occurs through soil mesopores and macropores (e.g., biopores and cracks). Field research has demonstrated that biopores and subsurface drains can be hydraulically connected. This research was conducted to investigate the importance of surface connected and disconnected (buried) biopores on Escherichia coli (E. coli) transport when biopores are located near ...
متن کاملNitrate, phosphate, and ammonium loads at subsurface drains: agroecosystems and nitrogen management.
Artificial subsurface drainage in cropland creates pathways for nutrient movement into surface water; quantification of the relative impacts of common and theoretically improved management systems on these nutrient losses remains incomplete. This study was conducted to assess diverse management effects on long-term patterns (1998-2006) of NO, NH, and PO loads (). We monitored water flow and nut...
متن کاملSpatial variation in herbicide leaching from a marine clay soil via subsurface drains
BACKGROUND Subsurface transport via tile drains can significantly contribute to pesticide contamination of surface waters. The spatial variation in subsurface leaching of normally applied herbicides was examined together with phosphorus losses in 24 experimental plots with water sampled flow-proportionally. The study site was a flat, tile-drained area with 60% marine clay in the topsoil in sout...
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ژورنال
عنوان ژورنال: Hilgardia
سال: 1968
ISSN: 0073-2230
DOI: 10.3733/hilg.v39n15p419