Quantitative Characterization of the Roughness of Four Artificially Prepared Gravel Surfaces
- 49 Downloads
Two-dimensional second-order structure functions (2DSSFs) have been widely used to investigate the roughness characteristics of gravel surfaces. Because of the complex patterns of the 2DSSFs, the interpretation of the 2DSSFs results remains challenging, and the explanations are mostly qualitative. Recently, a novel quantitative method for the description of the roughness of gravel-beds was proposed by Qin et al. (J Hydraul Res 57:90–106, 2019), which determines the statistical significance of structure functions based on Monte Carlo simulations. This new method is evaluated by four artificially prepared gravel surfaces to test the capability of the method in quantitatively differentiating predefined gravel structures. The four surfaces were prepared according to dissimilar arrangements of gravels and tried to represent gravel structures of different scales. The results successfully differentiated the roughness characteristics of the four surfaces and demonstrated the promising capability of the new method.
KeywordsGravel surfaces Roughness scales Structure functions
This work is supported by the National Key R&D Program of China (2016YFC0402506), the CRSRI Open Research Program (CKWV2019724/KY), and the Open Funding of the Key Laboratory of Port, Waterway and Sedimentation Engineering of Ministry of Transport (Yn918004).
- Cooper JR, Aberle J, Koll K, McLelland SJ, Murphy BM, Tait SJ, Marion A (2008) Observation of the near-bed flow field over gravel bed surfaces with different roughness length scales. In: Altinakar M, Kokpinar MA, Aydin I, Cokgor S, Kubaba SK (eds) Proceedings of the international conference on fluvial hydraulics river flow 2008, Cesme, Turkey, pp 739–746Google Scholar
- Powell DM, Ockelford AM, Rice SP, Hillier JK, Nguyen T, Reid I, Tate NJ, Ackerley D (2016) Structural properties of mobile armors formed at different flow strengths in gravel-bed rivers. J Geophys Res 121:1–21Google Scholar
- Strom KB, Papanicolaou AN (2008) Morphological characterization of cluster microforms. Sedimentology 55:137–153Google Scholar
- Wu C (2013) Towards linear-time incremental structure from motion. In: 2013 international conference on 3D vision (3DV). IEEE, pp 127–134Google Scholar