Next Article in Journal
Methane Production and Oxidation in Mangrove Soils Assessed by Stable Isotope Mass Balances
Previous Article in Journal
Estimation of Vegetation-Induced Flow Resistance for Hydraulic Computations Using Airborne Laser Scanning Data
Article

Yield Stress Model for Natural Debris Flows in Presence of Fine and Coarse–Grained Sediments

Department of Engineering, University of Ferrara, V. Saragat, 1, 44122 Ferrara, Italy
Academic Editor: Luís Filipe Sanches Fernandes
Water 2021, 13(13), 1865; https://doi.org/10.3390/w13131865
Received: 2 June 2021 / Revised: 29 June 2021 / Accepted: 29 June 2021 / Published: 4 July 2021
When dealing with natural geo–hazards, it is important to understand the influence of sediment sorting on debris flows. The presence of coarse fraction is one of the aspects which affects the rheological behaviour of natural viscous granular fluid mixtures. In this paper, experiments on reconstituted debris flow mixtures with different coarse–to–fine sediment ratios are considered. Such mixtures behave just as non–Newtonian yield stress fluids and their rheological behaviour is largely affected by the presence of coarse fraction. Experimental results demonstrate that yield stress is very sensitive not only to bulk sediment concentration but also to coarse sediment fraction. A novel yield stress model is presented. It accounts for an empirical grading function depending on the coarse–to–fine grain content. The yield stress model performed satisfactorily in comparison with the experiments, showing that it is almost independent of the coarse–to–fine grain fraction in case of dominant coarse sediment content. View Full-Text
Keywords: debris flows; yield stress; inclined plane experiments; fine and coarse–grained mixtures; rheology debris flows; yield stress; inclined plane experiments; fine and coarse–grained mixtures; rheology
Show Figures

Figure 1

MDPI and ACS Style

Schippa, L. Yield Stress Model for Natural Debris Flows in Presence of Fine and Coarse–Grained Sediments. Water 2021, 13, 1865. https://doi.org/10.3390/w13131865

AMA Style

Schippa L. Yield Stress Model for Natural Debris Flows in Presence of Fine and Coarse–Grained Sediments. Water. 2021; 13(13):1865. https://doi.org/10.3390/w13131865

Chicago/Turabian Style

Schippa, Leonardo. 2021. "Yield Stress Model for Natural Debris Flows in Presence of Fine and Coarse–Grained Sediments" Water 13, no. 13: 1865. https://doi.org/10.3390/w13131865

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop