Investigating runoff generation on compacted subsoil using a field rainfall simulator

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00304466" target="_blank" >RIV/68407700:21110/16:00304466 - isvavai.cz</a>

Výsledek na webu

<a href="http://meetingorganizer.copernicus.org/EGU2016/EGU2016-1135.pdf" target="_blank" >http://meetingorganizer.copernicus.org/EGU2016/EGU2016-1135.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Investigating runoff generation on compacted subsoil using a field rainfall simulator

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. At CTU in Prague a field rainfall simulator with 16 m2 experimental plots has been used for erosion and hydrologic research since 2012. Within early soil profile investigations in Bykovicky stream experimental catchment a compacted sandy-loam subsoil layer was identified, which was argued to affect greatly the overland runoff generation mechanism. Therefore the experimental setup was extended to capture the subsurface flow from a shallow cultivated topsoil. Eight sprinkling experiments of various rainfall intensities and durations ranging from 23 to 162 mm/hour and 60 to 155 minutes respectively were conducted from fall 2013 to summer 2015. Dynamics of subsurface flow, surface runoff and soil moisture in three depths was monitored. Various initial conditions of soil moisture and vegetation cover were represented in the experiments. While surface runoff did not form at lower intensities and the ponding time differed greatly at higher intensities depending on particular conditions, subsurface flow was observed in every simulation and started in average after 20–30 minutes. Both flow components interacted very fast, subsurface runoff forming from dominating part to one third of total runoff. Selected experiments were selected for consecutive modelling exploiting the subsurface moisture data. Both experimental and modelled results support the conceptual model of runoff formation on this particular site and suggest the necessity of considering the lateral flow in sites with similar conditions.

Název v anglickém jazyce

Investigating runoff generation on compacted subsoil using a field rainfall simulator

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. At CTU in Prague a field rainfall simulator with 16 m2 experimental plots has been used for erosion and hydrologic research since 2012. Within early soil profile investigations in Bykovicky stream experimental catchment a compacted sandy-loam subsoil layer was identified, which was argued to affect greatly the overland runoff generation mechanism. Therefore the experimental setup was extended to capture the subsurface flow from a shallow cultivated topsoil. Eight sprinkling experiments of various rainfall intensities and durations ranging from 23 to 162 mm/hour and 60 to 155 minutes respectively were conducted from fall 2013 to summer 2015. Dynamics of subsurface flow, surface runoff and soil moisture in three depths was monitored. Various initial conditions of soil moisture and vegetation cover were represented in the experiments. While surface runoff did not form at lower intensities and the ponding time differed greatly at higher intensities depending on particular conditions, subsurface flow was observed in every simulation and started in average after 20–30 minutes. Both flow components interacted very fast, subsurface runoff forming from dominating part to one third of total runoff. Selected experiments were selected for consecutive modelling exploiting the subsurface moisture data. Both experimental and modelled results support the conceptual model of runoff formation on this particular site and suggest the necessity of considering the lateral flow in sites with similar conditions.

Druh

O - Ostatní výsledky

CEP obor

DA - Hydrologie a limnologie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

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