On the interaction between shear dusty currents and buildings in vertical collapse: Theoretical aspects, experimental observations, and 3D numerical simulation

Doronzo, Domenico M.; Tullio, Marco D. de; Pascazio, G.; Dellino, Pierfrancesco; Liu, Guilin

doi:10.1016/j.jvolgeores.2015.07.011

Cited by 11 publications

(8 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, more control variables should be selected for comparative analysis in the future, which could enhance the study of the influence mechanism of UF–PM 2.5 concentration relationships. Finally, the study would use some uncertainty analysis to reach a refined study of PM 2.5 currents and diffusions inside the urban [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

The Effects of Urban Forms on the PM2.5 Concentration in China: A Hierarchical Multiscale Analysis

Ming-yue

Chang

et al. 2021

IJERPH

View full text Add to dashboard Cite

For a better environment and sustainable development of China, it is indispensable to unravel how urban forms (UF) affect the fine particulate matter (PM2.5) concentration. However, research in this area have not been updated consider multiscale and spatial heterogeneities, thus providing insufficient or incomplete results and analyses. In this study, UF at different scales were extracted and calculated from remote sensing land-use/cover data, and panel data models were then applied to analyze the connections between UF and PM2.5 concentration at the city and provincial scales. Our comparison and evaluation results showed that the PM2.5 concentration could be affected by the UF designations, with the largest patch index (LPI) and landscape shape index (LSI) the most influential at the provincial and city scales, respectively. The number of patches (NP) has a strong negative influence (−0.033) on the PM2.5 concentration at the provincial scale, but it was not statistically significant at the city scale. No significant impact of urban compactness on the PM2.5 concentration was found at the city scale. In terms of the eastern and central provinces, LPI imposed a weighty positive influence on PM2.5 concentration, but it did not exert a significant effect in the western provinces. In the western cities, if the urban layout were either irregular or scattered, exposure to high PM2.5 pollution levels would increase. This study reveals distinct ties of the different UF and PM2.5 concentration at the various scales and helps to determine the reasonable UF in different locations, aimed at reducing the PM2.5 concentration.

show abstract

Section: Resultsmentioning

confidence: 99%

The Effects of Urban Forms on the PM2.5 Concentration in China: A Hierarchical Multiscale Analysis

Ming-yue

Chang

et al. 2021

IJERPH

View full text Add to dashboard Cite

show abstract

“…It derives the general (multicomponent and multispecies) form for the eruptive jet density at the vent, which is In volcanology, and with reference to explosive volcanism, such recognition for eruptive jets subjected to dilatation is macroscopically related to the Bernoullian condition, which regulates the percentage of erupted mass that can rise up into the atmosphere versus collapse to the ground (Carazzo et al, 2008;Colucci et al, 2014;Costa et al, 2018;Dellino et al, 2014;Doronzo et al, 2015;Trolese et al, 2019). In the collapse scenario, a pyroclastic current is triggered at the base of the collapsing jet (not in the sense of base surge, but in general), and this implies that the physical characteristics of the jet can variably be responsible for the ones of the resulting pyroclastic current and its deposits.…”

Section: Source Dynamic Smentioning

confidence: 99%

Energy facies: A global view of pyroclastic currents from vent to deposit

2021

Self Cite

View full text Add to dashboard Cite

Pyroclastic currents are described as gravity currents, and the classic conceptual model gives a first-order importance to the density of such currents. This directs quantitative models to assume specific flow structures (shallow water or equilibrium turbulent boundary layer), which may apply to restricted volcanic areas independently of source dynamics or may correspond to source dynamics separate from topographic interaction. The recent introduction of two end-members of pyroclastic currents, inertial and forced, is further developed here, leading to a global conceptual model in which source dynamics and topographic interaction are both taken into account. The concept of energy facies is defined here as the ensemble of the firstorder indicators of pyroclastic currents (topological aspect ratio, competence ratio and emplacement temperature) that are proxies of the energy of such currents. Nine energy facies are introduced with general applicability and with the goal to globally characterize pyroclastic currents from vent to deposit.

show abstract

“…Modeling techniques can be used to understand and find solutions for environmental issues (e.g., Doronzo et al 2015). Several models to fit data of field trapped airborne for a distribution of horizontal mass flux are described in the literature.…”

Section: Erosion Modelingmentioning

confidence: 99%

Quantification of wind erosion from some arid soils in Jordan under two different management practices

Salahat

2016

Arab J Geosci

View full text Add to dashboard Cite

Jordan's national food security is challenged by many threats such as soil erosion and desertification. Unfortunately, Jordan lacks field data that can strengthen efforts in reducing erosion and therefore combating desertification necessary to enable sustainable decision making. This study aimed to investigate the effect of passing sheep on soil wind erosion and to quantify windblown soil mass in arid soils. The field was divided into two sites; the first site was subject to disturbance through passage of about 40 sheep biweekly, while the other site was kept undisturbed. Two Big Spring Number Eight (BSNE) sediment catcher traps were installed on each site. Two mass flux models were tested for calculating mass transport rates. The total horizontal flux is obtained by integrating the airborne particles collected by the BSNE sampler. Soil analyses showed no significant differences in all measured properties, ensuring that soil inherent erodibility is similar. Both models were significantly effective (P < 0.001) in predicting airborne sediment loads as indicated by their high associated R 2 and low root-mean-square error (RMSE). The results also showed that trapped airborne dust decreases with height, where maximum fluxes were generally at lowest height, indicating that saltation is the dominant transport mode. Average erosion from the disturbed site is almost double the undisturbed site, (6.6 and 3.9 t/ha, respectively). The suggested management plan is to set the area aside as a land reserve or at least performing better grazing management, which will insure lower disturbance of surface soil, result in better plant recover rate leading to stronger soil cover, and allow soil aggregates to develop and be more stable.

show abstract

On the interaction between shear dusty currents and buildings in vertical collapse: Theoretical aspects, experimental observations, and 3D numerical simulation

Cited by 11 publications

References 61 publications

The Effects of Urban Forms on the PM2.5 Concentration in China: A Hierarchical Multiscale Analysis

The Effects of Urban Forms on the PM2.5 Concentration in China: A Hierarchical Multiscale Analysis

Energy facies: A global view of pyroclastic currents from vent to deposit

Quantification of wind erosion from some arid soils in Jordan under two different management practices

Contact Info

Product

Resources

About