Study of dominant factors influencing shallow runoff formation at a small catchment scale

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F22%3A00359039" target="_blank" >RIV/68407700:21110/22:00359039 - isvavai.cz</a>

Výsledek na webu

<a href="https://dspace.cvut.cz/handle/10467/105096" target="_blank" >https://dspace.cvut.cz/handle/10467/105096</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Study of dominant factors influencing shallow runoff formation at a small catchment scale

Popis výsledku v původním jazyce

Rapidly changing soil hydraulic properties, the presence of wheel tracks and the compacted layer in the shallow subsoil are phenomena formed in agricultural areas due to agrotechnical operations. While wheel tracks affect surface runoff routing, the compacted layer with its low permeability can contribute to hypodermic runoff formation. A conceptual model of the rainfall-runoff transformation was formulated. The model assumes fast passage of rainfall water through the topsoil to compacted subsoil where a shallow perched water table causes a rapid hypodermic runoff, while wheel tracks route the overland flow. Within this framework, the abrupt change in soil properties between the topsoil and subsoil and the wheel tracks are the first-order control of the runoff from such areas. Data showed that the topsoil is orders of magnitude more heterogeneous compared to the subsoil. Wheel tracks played an important role in surface runoff generation. A wheel track can increase or decrease surface runoff and sediment transport depending on its orientation. Furthermore, it was shown that rainfall and runoff flattened the soil surface microtopography regardless of the presence or orientation of the wheel track. Based on the numerical analysis, surface runoff is first generated on the wheel track due to infiltration excess followed by the saturation excess overland flow in the surrounding soil. Lateral subsurface flow occurred only if subsoil morphology was neglected. The subsoil morphology caused predominant flow in the depressions in the morphology, preventing the development of lateral flow. It was concluded that the wheel tracks affect the runoff from agricultural catchments and should be included in hydrological models, e.g. with the concept of functional connectivity. The compacted layers affect the subsurface runoff only locally; however, they can affect the distribution of nutrients and water in the shallow part of the soil profile.

Název v anglickém jazyce

Study of dominant factors influencing shallow runoff formation at a small catchment scale

Popis výsledku anglicky

Rapidly changing soil hydraulic properties, the presence of wheel tracks and the compacted layer in the shallow subsoil are phenomena formed in agricultural areas due to agrotechnical operations. While wheel tracks affect surface runoff routing, the compacted layer with its low permeability can contribute to hypodermic runoff formation. A conceptual model of the rainfall-runoff transformation was formulated. The model assumes fast passage of rainfall water through the topsoil to compacted subsoil where a shallow perched water table causes a rapid hypodermic runoff, while wheel tracks route the overland flow. Within this framework, the abrupt change in soil properties between the topsoil and subsoil and the wheel tracks are the first-order control of the runoff from such areas. Data showed that the topsoil is orders of magnitude more heterogeneous compared to the subsoil. Wheel tracks played an important role in surface runoff generation. A wheel track can increase or decrease surface runoff and sediment transport depending on its orientation. Furthermore, it was shown that rainfall and runoff flattened the soil surface microtopography regardless of the presence or orientation of the wheel track. Based on the numerical analysis, surface runoff is first generated on the wheel track due to infiltration excess followed by the saturation excess overland flow in the surrounding soil. Lateral subsurface flow occurred only if subsoil morphology was neglected. The subsoil morphology caused predominant flow in the depressions in the morphology, preventing the development of lateral flow. It was concluded that the wheel tracks affect the runoff from agricultural catchments and should be included in hydrological models, e.g. with the concept of functional connectivity. The compacted layers affect the subsurface runoff only locally; however, they can affect the distribution of nutrients and water in the shallow part of the soil profile.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10501 - Hydrology

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

2022

Kód důvěrnosti údajů

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