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Titel
Simulation to support interpretation of field measurements to evaluate cover crop effects / Hirut Abebe Demissie
VerfasserAbebe Demissie, Hirut
Betreuer / BetreuerinLoiskandl, Willibald
Erschienen2007
Umfang72 Bl. : Ill., graph. Darst.
HochschulschriftWien, Univ. für Bodenkultur, Masterarb., 2007
SpracheEnglisch
Bibl. ReferenzOeBB
DokumenttypMasterarbeit
Schlagwörter (DE)Hydrus_1D, Simulation, Wassergehalt, Wassespannung, Wasserbewegung in der ungesättigten Zone, Wasserbilanzierung, Messsensor, Zwischenfrucht, Feldmessstellen
Schlagwörter (EN)Hydrus_1D, simulation, water content, soil water pressure, sensors, water movement in vadose zone, water balance, cover crop, field measurment sites
Schlagwörter (GND)Deckfrucht / Bodenwasserhaushalt / Messwert / Simulation
URNurn:nbn:at:at-ubbw:1-12836 Persistent Identifier (URN)
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 Das Werk ist frei verfügbar
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Simulation to support interpretation of field measurements to evaluate cover crop effects [2 mb]
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Zusammenfassung (Deutsch)

To support the interpretation of soil water status measurements, simulations were performed with Hydrus_1D (version 3.0). Water content measurements were available at the experimental site where the effects of cover crops on the water balance were studied from Oct. 2002 to July 2005. The measured water contents are compared with the simulated results. The main objectives are the program handling for this specific case study, determining the data requirements and detecting short comings. Additionally, measurement gaps during the measurement failure of the FDR-devices could be filled and the moisture variation during different cropping seasons could be observed. With the calibrated model water flow calculations, like top and bottom fluxes, could be performed. For a better interpretation all results are presented in graphical form. The simulation result of the bare soil period was found to be almost exactly equal to the measured ones. Since the root water uptake can be influenced by different factors, a good knowledge of parameters for a given crop is very important for the exact determination of the seasonal water content variation. Main emphasis was paid to the careful determination, of initial and boundary conditions, which is essential to achieve reliable simulation results. The period of mulch application on the soil surface needs substantial modification of input parameters. By simulating the different cropping periods water flow could be estimated and the information obtained by monitoring could be substantially extended.

Zusammenfassung (Englisch)

To support the interpretation of soil water status measurements, simulations were performed with Hydrus_1D (version 3.0). Water content measurements were available at the experimental site where the effects of cover crops on the water balance were studied from Oct. 2002 to July 2005. The measured water contents are compared with the simulated results. The main objectives are the program handling for this specific case study, determining the data requirements and detecting short comings. Additionally, measurement gaps during the measurement failure of the FDR-devices could be filled and the moisture variation during different cropping seasons could be observed. With the calibrated model water flow calculations, like top and bottom fluxes, could be performed. For a better interpretation all results are presented in graphical form. The simulation result of the bare soil period was found to be almost exactly equal to the measured ones. Since the root water uptake can be influenced by different factors, a good knowledge of parameters for a given crop is very important for the exact determination of the seasonal water content variation. Main emphasis was paid to the careful determination, of initial and boundary conditions, which is essential to achieve reliable simulation results. The period of mulch application on the soil surface needs substantial modification of input parameters. By simulating the different cropping periods water flow could be estimated and the information obtained by monitoring could be substantially extended.