Effects exerted by average particle size and non uniformity on bed surface fractal properties

• Autorzy: Pan Yunwen , Xia Junqiang , Cai Tun , Yang Kejun

Identyfikatory

DOI

10.1007/s11600-022-00888-3

• Języki publikacji: EN

Abstrakty

EN

Sediment bed surfaces exist widely in natural rivers, and many aspects in river dynamics are closely relevant to bed surface roughness, such as flow structure, river resistance and sediment transport. As two important parameters for quantifying bed surface roughness, how average particle size and non-uniformity affect bed surface structure is unknown. Therefore, nine groups of sediment samples with different average particle sizes or different non-uniformities were firstly prepared by screening dry natural sediments. Then, the prepared sediment samples were used to manually pave nine groups of bed surfaces, and the high-precise bed surface digital elevations were obtained by a handheld 3D laser scanner. Finally, the effects exerted by the average particle size and non-uniformity on the bed surface fractal properties were discussed. The results showed that there is only a scale-free range in a profile or a two-dimensional specific direction of a bed surface with normal-distributed particle gradation. The averaged scale-free upper limit in the two-dimensional specific directions and that related to many profiles are less affected by the non-uniformity, but more affected by the average particle size. For the bed surfaces with the same non-uniformity, when the average particle size is smaller than 15 mm, the larger the average particle size is, the smaller the fractal dimension is, but the larger the scale coefficient is; when the average particle size is larger than 15 mm, the larger the average particle size is, the larger the fractal dimension and the scale coefficient are, while for the bed surfaces with the same average particle size, the non-uniformity has no significant effects on the fractal dimension and the scale coefficient. The averaged scale coefficient in the two-dimensional specific directions of an isotropic bed surface and that related to many profiles are approximately equal, but the averaged fractal dimension in the two-dimensional specific directions is obviously larger than that plus 1 related to many profiles.

Słowa kluczowe

EN

sediment bed surface; semivariogram; fractal dimension; scale coefficient; fractal properties

PL

powierzchnia złoża osadu; półwariogram; wymiar fraktalny; współczynnik skali

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2023
• Tom: Vol. 71, no. 1
• Strony: 517--529
• Opis fizyczny: Bibliogr. 44 poz.

Twórcy

autor

Pan Yunwen

• State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
• State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China

autor

Xia Junqiang

• State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China

autor

Cai Tun

• State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China

autor

Yang Kejun

• State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065, China

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).