Browse > Article
http://dx.doi.org/10.9765/KSCOE.2021.33.3.110

Development of Numerical Model for Mixed Soil Problems Using Dry Bulk Density and Investigation of Its Numerical Stability  

Cho, Yong-Hwan (Dept. of Civil Eng., Nagoya University)
Lee, Kwang-Ho (Dept. of Civil Eng., Korea Maritime and Ocean Univ.)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.33, no.3, 2021 , pp. 110-121 More about this Journal
Abstract
The importance of tidal flats lost due to industrialization has recently received attention, and attention is being paid to the creation of artificial tidal flats and maintenance of natural tidal flats. However, there is still a lack of understanding about the behavioral characteristics of mud, mud, and sand that form tidal flats. Although research on the movement characteristics of mixed soils such as tidal flats has been conducted through field investigations and hydraulic experiments, interest in developing a numerical model based on these results has not yet reached. In this paper, the purpose of this paper is to establish a mixed soil model that can efficiently manage the low quality of the tidal flats. In constructing a model for reproducing the surface movement of mixed soil, the numerical stability of the reproduction and movement of sand and mud constituting the mixed soil in the numerical model should be considered first, so first, the volume of sand and mud constituting the mixed soil A mixed soil model representing the relationship was proposed based on a topographical diagram representing the geometric structure of the mixed soil. In order to consider the dry bulk density of the mixed soil, it was possible to consider the dry bulk density of the mud by introducing the water content of the mud containing water. In addition, it was confirmed that the mud and sand movement calculation according to the slope collapse of the mixed soil was stably performed through the calculation of the slope collapse of the mixed soil through the numerical analysis model to which the proposed mixed soil model was applied.
Keywords
mixed soil model; mixed soil slide calculation; dry bulk density; mud content;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Imamura, H., Habara, H. and Fukuda, K. (1993). Creation of artificial tidal flat as mitigation technology. Proceedings of Coastal Engineering, Japan Society of Civil Engineers, 40, 1111-1115 (in Japanese).   DOI
2 Panagiotopoulos, I., Voulgaris, G. and Collins, M.B. (1997). The influence of clay on the threshold of movement of fine sandy beds. Coastal Engineering, 32(1), 19-43.   DOI
3 Cho, Y., Nakamura, T. and Mizutani, N. (2019). Introduction of clay loss to mixed soil calculation, Journal of Japan Society of Civil Engineers, Series B2 (Coastal Engineering), 75(2), I_475-I_480 (in Japanese).   DOI
4 Hanawa, S. (2006). Present situation and future of tidal flats in Japan. Chikyu Kankyo, 11(2), 235-244 (in Japanese).
5 Kim, H.Y. and Jeon, B.G. (2015). Technologies of artificial tidal flat creation. Geotechnical Engineering, 31(4), 30-34.
6 Mang, J.H. and Hong, J.S. (2008). Effective mitigation measures for the loss of tidal flat in coastal development projects. Journal of Wetlands Research, 10(1), 49-57.
7 Kumagai, T., Tsuchida, T., Abe, T., Kikuhara, N. and Nunoya, N. (2012). Experimental study on response of sandy mud to wave action. Journal of Japan Society of Civil Engineers, Series B2 (Coastal Engineering), 68(2), 546-550.
8 Wu, W., Perera, C., Smith, J. and Sanchez, A. (2018). Critical shear stress for erosion of sand and mud mixtures. Journal of Hydraulic Research, 56(1), 96-110.   DOI
9 Nakamura, T., Cho, Y., Mizutani, N. and Lee, K.-H. (2013). Sediment transport calculation considering cohesive effects and its application to wave-induced topographic change of shallows. Japan Society of Civil Engineers, Series B2 (Coastal Engineering), 69(2), I_1036-I_1041 (in Japanese).   DOI
10 Takayama, Y., Kokubu, H. and Ueno, S. (2008). The optimum sediment quality condition for benthos habitat found from the field study of the tidal flat which is constructed by dredged sludge in ago bay. Japan, Doboku Gakkai Ronbunshuu B, 2008, 64(3), 139-150 (in Japanese).   DOI
11 Kimura, K., Nishimura, O., Ota, Y., Mishima, Y., Shibata, N., Inamori, Y. and Sudo, R. (2002). Study on the succession processes of fish, wild birds and shore florae in artificial beaches. Doboku Gakkai Ronbunshu, 2002(720), 15-25 (in Japanese).
12 Mitchener, H. and Torfs, H. (1996), Erosion of mud/sand mixtures. Coastal Engineering, 29(1-2), 1-25.   DOI
13 Ashida, K., Egashira, S. and Kamoto, M. (1982). Study on the erosion and variation of mountain streams - on the erosion and transportation of sand-clay mixtures. Disaster Prevention Research Institute Annuals B, 25(B-2), 349-360 (in Japanese).
14 Cheng, Z., Hsu, T. and Calantoni, J. (2017). SedFoam: A multi-dimensional Eulerian two-phase model for sediment transport and its application to momentary bed failure. Coastal Engineering, 119, 32-50.   DOI
15 Kuwae, T. (2005). Development and self-stabilization of restored and created intertidal flat ecosystems. Doboku Gakkai Ronbunshu, 2005(790), 790_25-790_34 (in Japanese).   DOI
16 Nakamura, T. and Mizutani, N. (2010). Numerical simulation of local scouring around inland structure due to run-up tsunami using three-dimensional coupled fluid-structure-sediment interaction model, 24th CFD Symposium. Japan Society of Fluid Mechanics, E10-4,9p (in Japanese).
17 Van Rijn, L.C. and Barth, R. (2019). Settling and consolidation of soft mud-sand layers. Journal of Waterway, Port, Coastal, and Ocean Engineering, 145(1), 04018028.   DOI
18 Nakamura, T. and Mizutani, N. (2016). Numerical simulation of large-scale experiments on local scouring at the landward toe of a coastal dike due to tsunami overflow, Nagare, Japan Society of Fluid Mechanics, 35(5), 379-390 (in Japanese).
19 Rafati, Y., Hsu, T., Cheng, Z., Yu, X. and Calantoni, J. (2020). Armoring and exposure effects on the wave-driven sediment transport. Continental Shelf Research, 211, 104291.   DOI
20 Roulund, A., Sumer, B.M., Fredsoe, J. and Michelsen, J. (2005). Numerical and experimental investigation of flow and scour around a circular pile. Journal of Fluid Mechanics, 534, 351-401.   DOI
21 Van Rijn, L.C. (2020). Erodibility of mud-sand bed mixtures. Journal of Hydraulic Engineering, 146(1), 04019050.   DOI