The effects of rain drop impact on soil surface microtopography

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F19%3A00332209" target="_blank" >RIV/68407700:21110/19:00332209 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3929/ethz-b-000347541" target="_blank" >https://doi.org/10.3929/ethz-b-000347541</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3929/ethz-b-000347541" target="_blank" >10.3929/ethz-b-000347541</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The effects of rain drop impact on soil surface microtopography

Popis výsledku v původním jazyce

The soil surface is the boundary between the atmosphere and the pedosphere where collisions of rain drops with soil particles occur. As a result of these collisions, the processes such as splash erosion, infiltration, surface runoff and soil erosion take place. Within the ongoing project on rainfall kinetic energy and soil particles detachment, the impact of rainfall droplets on the soil surface has been measured in both field and laboratory setups. Disdrometers were used for measuring rainfall parameters and photogrammetric method “Structure from Motion” was used for evaluation of soil surface changes. This study presents the effect of the rainfall with various rainfall intensities and kinetic energies on splash erosion under controlled conditions maintained with the laboratory rainfall simulator. The kinetic energy at these positions ranged from 112 to 574 J/m2/h and the rainfall intensity from 23 to 71 mm/hr. Soil samples were tested in modified Morgan splash cup. After every rainfall simulation, the splashed material was collected, filtered and dried to estimate total amount of soil loss. Photogrammetric measurement included acquisition of 12 pictures of every splash cup prior and after the rainfall. The photogrammetric monitoring results in sets of digital elevation models (DEM). The DEMs were evaluated, the properties of the soil surface and its changes due to the impact of rain drops were analyzed. These values were further compared with the rainfall parameters and measured splash erosion. Relationship between rainfall intensity and average surface roughness variation from 5 experiments can be described by linear regression function with an acceptable coefficient of determination of 0.76. The linear relationship between the surface roughness change and the rainfall kinetic energy results in the coefficient of determination of 0.62. The research was supported by grant GA17-33751L and SGS17/173/OHK1.

Název v anglickém jazyce

The effects of rain drop impact on soil surface microtopography

Popis výsledku anglicky

The soil surface is the boundary between the atmosphere and the pedosphere where collisions of rain drops with soil particles occur. As a result of these collisions, the processes such as splash erosion, infiltration, surface runoff and soil erosion take place. Within the ongoing project on rainfall kinetic energy and soil particles detachment, the impact of rainfall droplets on the soil surface has been measured in both field and laboratory setups. Disdrometers were used for measuring rainfall parameters and photogrammetric method “Structure from Motion” was used for evaluation of soil surface changes. This study presents the effect of the rainfall with various rainfall intensities and kinetic energies on splash erosion under controlled conditions maintained with the laboratory rainfall simulator. The kinetic energy at these positions ranged from 112 to 574 J/m2/h and the rainfall intensity from 23 to 71 mm/hr. Soil samples were tested in modified Morgan splash cup. After every rainfall simulation, the splashed material was collected, filtered and dried to estimate total amount of soil loss. Photogrammetric measurement included acquisition of 12 pictures of every splash cup prior and after the rainfall. The photogrammetric monitoring results in sets of digital elevation models (DEM). The DEMs were evaluated, the properties of the soil surface and its changes due to the impact of rain drops were analyzed. These values were further compared with the rainfall parameters and measured splash erosion. Relationship between rainfall intensity and average surface roughness variation from 5 experiments can be described by linear regression function with an acceptable coefficient of determination of 0.76. The linear relationship between the surface roughness change and the rainfall kinetic energy results in the coefficient of determination of 0.62. The research was supported by grant GA17-33751L and SGS17/173/OHK1.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

10501 - Hydrology

Projekt

<a href="/cs/project/GF17-33751L" target="_blank" >GF17-33751L: Vliv kinetické energie deště na uvolňování a transport půdních částic</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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