FAIMON, Jiří a Slavomír NEHYBA. The formation of spherical clay balls on the slopes of sandpit quarry, the Rudice-Sec (Czech Republic). Catena. Elsevier, 2004, roč. 58, č. 1, s. 23-40, 17 s.
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Základní údaje
Originální název The formation of spherical clay balls on the slopes of sandpit quarry, the Rudice-Sec (Czech Republic)
Název česky Tvorba sférických závalků na svazích pískového lomu, Rudice-Seč (ČR)
Autoři FAIMON, Jiří (203 Česká republika, garant) a Slavomír NEHYBA (203 Česká republika).
Vydání Catena, Elsevier, 2004.
Další údaje
Originální jazyk angličtina
Typ výsledku Článek v odborném periodiku
Obor 10500 1.5. Earth and related environmental sciences
Stát vydavatele Nizozemsko
Utajení není předmětem státního či obchodního tajemství
Organizační jednotka Přírodovědecká fakulta
UT WoS 000223391900002
Klíčová slova česky závalky; pukliny; roklinová eroze; děšťové srážky; tvarování; sfericita; transport
Klíčová slova anglicky Clay balls; Cracks; Gully erosion; Rainfall; Shaping; Sphericity; Transport
Příznaky Mezinárodní význam, Recenzováno
Změnil Změnil: doc. Ing. Jiří Faimon, Dr., učo 1405. Změněno: 23. 9. 2009 15:29.
Anotace
Clays on the steep slopes of a small artificial sedimentary basin (sandpit quarry) alternately desiccate/crack and erode during hot dry and rainy seasons, respectively. Small irregular blocks of clay (IBC) predefined by cracks are released by gully erosion. The IBCs are quickly transported to the slope base and then rolled down the basin bottom by runoff. Due to rotation about a randomly changing axis and under an effect of deformation forces, the IBCs are transformed into spherical clay balls (SCB). The SCBs are transported, in general, towards the depositional base where they are buried by assorted sandy/clayey sediment. As soon as the kinetic energy of the runoff has decreased, the SCBs remain spread along transport path. From their distribution, the shaping process was evaluated. Based on data processing, the dependency, Psí = 1-{1-Psí(0)}x10^{-8.9E-5 lambda/d(ef)} relating the clay ball projection sphericity, Psí, to the effective diameter, d(ef), and to the distance from the steep slope base, lambda, was found. Based on this equation, the length of clay ball transport can be estimated if the projection sphericity and effective diameter are known.
Anotace česky
Clays on the steep slopes of a small artificial sedimentary basin (sandpit quarry) alternately desiccate/crack and erode during hot dry and rainy seasons, respectively. Small irregular blocks of clay (IBC) predefined by cracks are released by gully erosion. The IBCs are quickly transported to the slope base and then rolled down the basin bottom by runoff. Due to rotation about a randomly changing axis and under an effect of deformation forces, the IBCs are transformed into spherical clay balls (SCB). The SCBs are transported, in general, towards the depositional base where they are buried by assorted sandy/clayey sediment. As soon as the kinetic energy of the runoff has decreased, the SCBs remain spread along transport path. From their distribution, the shaping process was evaluated. Based on data processing, the dependency, Psí = 1-{1-Psí(0)}x10^{-8.9E-5 lambda/d(ef)} relating the clay ball projection sphericity, Psí, to the effective diameter, d(ef), and to the distance from the steep slope base, lambda, was found. Based on this equation, the length of clay ball transport can be estimated if the projection sphericity and effective diameter are known.
Návaznosti
MSM 143100004, záměrNázev: Geologické procesy a jejich environmentální vyústění - styk variscid a alpid
Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Výzkumné záměry
VytisknoutZobrazeno: 23. 4. 2021 13:24