Observation of the dominant runoff pathways on inclined arable soils

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00304472" target="_blank" >RIV/68407700:21110/16:00304472 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Observation of the dominant runoff pathways on inclined arable soils

Popis výsledku v původním jazyce

Understanding the dominant runoff generation process is vital for both hydrologic and erosion field research and modelling. Although lateral subsurface stormflow and consecutive topsoil saturation are well known to be rather frequent, majority of the models still assume Hortonian runoff only. This assumption may be especially invalid in sloping arable land with compacted subsoil. We have conducted several plot scale rainfall simulations to investigate the runoff generation and flow pathways and the temporary variable catchment connectivity. The experiments were carried out on the experimental plots Bykovice, where a clear divide between the topsoil and compacted subsoil was detected. An inclined experimental plot was successively exposed to uniform simulated rainfall. The dynamics of surface and shallow subsurface runoff and the soil water regime were monitored. Variable proportions of both monitored runoff components were observed in relation to rainfall intensity and duration, ranging from zero surface runoff to a distinct dominance of surface runoff. Both components reacted very dynamically to the precipitation: shallow subsurface runoff was formed first under all tested conditions. Even with the highest tested precipitation intensities, surface runoff always formed due to saturation excess of the topsoil, irrespective of the topsoil properties and crops. Additional comparison of the experiments results with whole experimental catchment runoff regime (Nucice, Czech Republic) proves that lateral runoff through the shallow topsoil can easily cause a very quick increase of stream discharge.

Název v anglickém jazyce

Observation of the dominant runoff pathways on inclined arable soils

Popis výsledku anglicky

Understanding the dominant runoff generation process is vital for both hydrologic and erosion field research and modelling. Although lateral subsurface stormflow and consecutive topsoil saturation are well known to be rather frequent, majority of the models still assume Hortonian runoff only. This assumption may be especially invalid in sloping arable land with compacted subsoil. We have conducted several plot scale rainfall simulations to investigate the runoff generation and flow pathways and the temporary variable catchment connectivity. The experiments were carried out on the experimental plots Bykovice, where a clear divide between the topsoil and compacted subsoil was detected. An inclined experimental plot was successively exposed to uniform simulated rainfall. The dynamics of surface and shallow subsurface runoff and the soil water regime were monitored. Variable proportions of both monitored runoff components were observed in relation to rainfall intensity and duration, ranging from zero surface runoff to a distinct dominance of surface runoff. Both components reacted very dynamically to the precipitation: shallow subsurface runoff was formed first under all tested conditions. Even with the highest tested precipitation intensities, surface runoff always formed due to saturation excess of the topsoil, irrespective of the topsoil properties and crops. Additional comparison of the experiments results with whole experimental catchment runoff regime (Nucice, Czech Republic) proves that lateral runoff through the shallow topsoil can easily cause a very quick increase of stream discharge.

Druh

O - Ostatní výsledky

CEP obor

DA - Hydrologie a limnologie

OECD FORD obor

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Projekt

<a href="/cs/project/QJ1230056" target="_blank" >QJ1230056: Vliv očekávaných klimatických změn na půdy České republiky a hodnocení jejich produkční funkce.</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů