Variable rainfall intensity during soil erosion experiments at the laboratory rainfall simulator

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F16%3A00301818" target="_blank" >RIV/68407700:21110/16:00301818 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Variable rainfall intensity during soil erosion experiments at the laboratory rainfall simulator

Original language description

Experimental research of soil erosion at the laboratory rainfall simulator at the CTU in Prague continued with 11th soil set Trebesice III in 2014/2015. Standard simulations with constant rainfall intensity were complemented by additional simulations with variable rainfall intensity with two different patterns. The main objective was to determine the feasibility of these experiments and the effect on erosion characteristics compared to those with constant rainfall intensity. This measurement consist of 60 minute simulations with increasing rainfall intensity with pattern of 20-40-60 mm/hr (“inc”) and decreasing intensity with pattern of 60-40-20 mm/hr (“dec”) which have been compared with experiments with constant rainfall intensity of 40 mm/hr (“c40”). All experiments thus reaching the same total precipitation during entire simulation. This comparison was done on soil sample with dimensions of 4x0,9x0,15 meters and slope adjusted at 4° and 8°. In case of steady soil conditions results show there is no significant difference in surface runoff in term of cumulative values and development between “c40”, “inc” and “dec”. On the other hand, results of soil loss from the same experiments differ according to rainfall intensity pattern in both development and cumulative values. While “inc” experiment has slightly lower (up to 10 %) soil loss than “c40”, development of soil loss of “dec” experiment is almost two times lower compare to “c40”. Experiments with longitudinal soil surface of 8° differ in soil moisture that affects results more than variable rainfall intensity pattern. Experimental research of soil erosion at the laboratory rainfall simulator confirmed that it is possible to easily simulate and observe soil erosion characteristic with variable rainfall intensity. Results show basic differences in rainfall-runoff parameters between experiments with two variable rainfall intensity patterns and experiments with constant rainfall intensity.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

DF - Pedology

OECD FORD branch

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Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2016

Confidentiality

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