Enhancing direct runoff estimates through modification of NRCS-CN method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00020711%3A_____%2F23%3A10154941" target="_blank" >RIV/00020711:_____/23:10154941 - 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

Enhancing direct runoff estimates through modification of NRCS-CN method

Popis výsledku v původním jazyce

The Natural Resources Conservation Service Curve Number (NRCS-CN) method, formerly known as Soil Conservation Service Curve Number (SCS-CN), was developed in the USA for estimating direct runoff in small agricultural watersheds. Given its relative simplicity and feasibility, the method became globally known and has been commonly used in hydrological modelling and other environmental applications. Over the decades of its existence, the NRCS-CN method has undergone a number of different modifications with the aim of improving the accuracy of the results in diverse geographical conditions. In Czechia the NRCS-CN method is usually employed in the unchanged form, i.e. through tabulated CN values characterizing the hydrological properties of soils, land cover and antecedent moisture conditions classes. However, previous experience shows that using the method in its original setting is problematic. This contribution therefore presents an overview of some modifications of the NRCS-CN method, which aimed to enhance the direct runoff estimates in predominantly agricultural experimental catchments in Czechia: (1) Modification of initial abstraction coefficient λ using the tabulated CN values; (2) event analysis based on empirical parameters of rainfall-runoff events; (3) derivation of direct runoff from rainfall and catchments&apos; physiographic characteristics through stepwise and least trimmed square regressions.

Název v anglickém jazyce

Enhancing direct runoff estimates through modification of NRCS-CN method

Popis výsledku anglicky

The Natural Resources Conservation Service Curve Number (NRCS-CN) method, formerly known as Soil Conservation Service Curve Number (SCS-CN), was developed in the USA for estimating direct runoff in small agricultural watersheds. Given its relative simplicity and feasibility, the method became globally known and has been commonly used in hydrological modelling and other environmental applications. Over the decades of its existence, the NRCS-CN method has undergone a number of different modifications with the aim of improving the accuracy of the results in diverse geographical conditions. In Czechia the NRCS-CN method is usually employed in the unchanged form, i.e. through tabulated CN values characterizing the hydrological properties of soils, land cover and antecedent moisture conditions classes. However, previous experience shows that using the method in its original setting is problematic. This contribution therefore presents an overview of some modifications of the NRCS-CN method, which aimed to enhance the direct runoff estimates in predominantly agricultural experimental catchments in Czechia: (1) Modification of initial abstraction coefficient λ using the tabulated CN values; (2) event analysis based on empirical parameters of rainfall-runoff events; (3) derivation of direct runoff from rainfall and catchments&apos; physiographic characteristics through stepwise and least trimmed square regressions.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

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Návaznosti

O - Projekt operacniho programu

Rok uplatnění

2023

Kód důvěrnosti údajů

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