Effect of particle size segregation in debris flow deposition: A preliminary study

Effect of particle size segregation in debris flow deposition: A preliminary study. Jing, L., Kwok, F. C. Y., Zhao, T., & Zhou, J. In Farid, A. & Chen, H., editors, Proceedings of GeoShanghai 2018 International Conference: Geoenvironment and Geohazard, pages 73–80, Singapore, 2018. Springer Singapore.

Paper doi abstract bibtex

To understand the effect of size segregation in the depositional process of debris ﬂows, both ﬂume experiments at the laboratory scale and numerical simulations using the discrete element method (DEM) are performed. A variety of particle size distributions with coarse and ﬁne particles are adopted. It is found that larger particles tend to reach the front of the ﬁnal deposits, while small particles are accumulated at the tail of the ﬂows. Quantitative agreement is achieved in the DEM simulations, where rolling resistance and geometric roughness at boundaries are adopted to account for the effect of particle shape. With the DEM results, the effect of segregation on the runout distance is studied from the perspective of energy dissipation. The progress of segregation is analyzed in detail, which revealed that segregation occur slowly while the ﬂow is propagating rapidly over the slopes; it becomes signiﬁcant during the deposition stage, where more large particles are found near the surface. The effect of segregation in debris ﬂow deposition can help better predict the runout distance and impact pressure, which is crucial in the assessment and mitigation of debris ﬂow-related natural hazards.

@inproceedings{farid_effect_2018,
	address = {Singapore},
	title = {Effect of particle size segregation in debris flow deposition: {A} preliminary study},
	isbn = {9789811301278 9789811301285},
	shorttitle = {Effect of particle size segregation in debris flow deposition},
	url = {http://link.springer.com/10.1007/978-981-13-0128-5_9},
	abstract = {To understand the effect of size segregation in the depositional process of debris ﬂows, both ﬂume experiments at the laboratory scale and numerical simulations using the discrete element method (DEM) are performed. A variety of particle size distributions with coarse and ﬁne particles are adopted. It is found that larger particles tend to reach the front of the ﬁnal deposits, while small particles are accumulated at the tail of the ﬂows. Quantitative agreement is achieved in the DEM simulations, where rolling resistance and geometric roughness at boundaries are adopted to account for the effect of particle shape. With the DEM results, the effect of segregation on the runout distance is studied from the perspective of energy dissipation. The progress of segregation is analyzed in detail, which revealed that segregation occur slowly while the ﬂow is propagating rapidly over the slopes; it becomes signiﬁcant during the deposition stage, where more large particles are found near the surface. The effect of segregation in debris ﬂow deposition can help better predict the runout distance and impact pressure, which is crucial in the assessment and mitigation of debris ﬂow-related natural hazards.},
	language = {en},
	urldate = {2018-05-15},
	booktitle = {Proceedings of {GeoShanghai} 2018 {International} {Conference}: {Geoenvironment} and {Geohazard}},
	publisher = {Springer Singapore},
	author = {Jing, Lu and Kwok, Fiona C. Y. and Zhao, Tao and Zhou, Jiawen},
	editor = {Farid, Arvin and Chen, Hongxin},
	year = {2018},
	doi = {10.1007/978-981-13-0128-5_9},
	pages = {73--80}
}

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