Clarifying the role of pipe flow on shallow landslide initiation

2004 ◽  
Vol 18 (2) ◽  
pp. 375-378 ◽  
Author(s):  
Taro Uchida
Keyword(s):  
Pipe Flow ◽  
Shallow Landslide

The role of streamwise perturbations in pipe flow transition

2006 ◽  
Vol 18 (7) ◽  
pp. 074104 ◽  
Author(s):  
Fernando Mellibovsky ◽  
Alvaro Meseguer
Keyword(s):  
Pipe Flow ◽  
Flow Transition

Hydrodynamic Aspects of Drag Reduction with Additives

1973 ◽  
Vol 10 (03) ◽  
pp. 284-292
Author(s):  
Paul S. Granville
Keyword(s):  
Turbulent Flow ◽  
Drag Reduction ◽  
Boundary Layers ◽  
Pipe Flow ◽  
Fundamental Properties ◽  
Flow Through ◽  
Similarity Law ◽  
Similarity Laws

The hydrodynamic aspects of drag reduction with additives are presented. The fundamental properties of this remarkable phenomenon are described. A brief history is outlined from anomalous results in pipe flow, through strange effects in the Texas oilfields and to the current research efforts. Correlation by means of the velocity similarity laws of turbulent flow is explained for drag reduction in pipe flow and for the boundary layers on bodies. The limits of drag reduction are also explained on the basis of the interactive similarity law. The peculiar role of viscoelasticity is examined. Naval architectural applications are reviewed.

scholarly journals The Role of Initial Soil Conditions in Shallow Landslide Triggering: Insights from Physically Based Approaches

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
L. Schilirò ◽  
G. Poueme Djueyep ◽  
C. Esposito ◽  
G. Scarascia Mugnozza
Keyword(s):  
Central Italy ◽  
Shallow Landslide ◽  
Rainfall Event ◽  
Soil Conditions ◽  
Initial Water Content ◽  
Extreme Rainfall Event ◽  
Wetting Front ◽  
Clayey Sand ◽  
Physically Based

In the last years, the shallow landslide phenomenon has increasingly been investigated through physically based models, which try to extend over large-area simplified slope stability analyses using physical and mechanical parameters of the involved material. However, the parameterization of such models is usually challenging even at the slope scale, due to the numerous parameters involved in the failure mechanism. In particular, considering the scale of the phenomenon, the role of transient hydrology is essential. For this reason, in this work we present the outcome of different experimental tests conducted on a soil slope model with a sloping flume. The tested material was sampled on Monte Mario Hill (Rome, Central Italy), an area which has been frequently affected by rainfall-induced landslide events in the past. In this respect, we also performed a physically based numerical analysis at the field conditions, in order to evaluate the response of the terrain to a recent extreme rainfall event. The results of the flume tests show that, for the same material, two different triggering mechanisms (i.e., uprise of a temporary water table and advance of the wetting front) occur by varying the initial water content only. At the same time, the results of the numerical simulations indicate that clayey sand and lean clay are the soil types mostly influenced by the abovementioned rainfall event, since the initial moisture conditions enhance the formation of a wide wetting front within the soil profile.

Shallow-landslide susceptibility in the Costa Viola mountain ridge (southern Calabria, Italy) with considerations on the role of causal factors

2014 ◽  
Vol 73 (1) ◽  
pp. 111-136 ◽  
Author(s):  
Giulio G. R. Iovine ◽  
Roberto Greco ◽  
Stefano L. Gariano ◽  
Annamaria D. Pellegrino ◽  
Oreste G. Terranova
Keyword(s):  
Landslide Susceptibility ◽  
Shallow Landslide ◽  
Mountain Ridge ◽  
Causal Factors

scholarly journals The initial stage of transition in pipe flow: role of optimal base-flow distortions

2004 ◽  
Vol 517 ◽  
pp. 131-165 ◽  
Author(s):  
M. I. GAVARINI ◽  
A. BOTTARO ◽  
F. T. M. NIEUWSTADT
Keyword(s):  
Pipe Flow ◽  
Base Flow ◽  
Initial Stage

Compressible turbulent channel and pipe flow: similarities and differences

2010 ◽  
Vol 648 ◽  
pp. 155-181 ◽  
Author(s):  
SOMNATH GHOSH ◽  
HOLGER FOYSI ◽  
RAINER FRIEDRICH
Keyword(s):  
Pipe Flow ◽  
Pressure Fluctuations ◽  
Plane Channel ◽  
Reynolds Numbers ◽  
Mean Flow ◽  
Specific Heats ◽  
Pipe Radius ◽  
Turbulent Plane ◽  
Similarities And Differences

Direct numerical simulation (DNS) is used to explore similarities and differences between fully developed supersonic turbulent plane channel and axisymmetric non-swirling pipe flow bounded by isothermal walls. The comparison is based on equal friction Mach number, friction Reynolds number, Prandtl number, ratio of specific heats and viscosity exponent. The channel half-width and pipe radius are chosen to define the Reynolds numbers. To what extent and why mean flow quantities, second-order turbulence statistics and terms in the Reynolds stress equations coincide or diverge in both flows are investigated. The role of the fluctuating pressure in causing characteristic differences among correlations involving pressure fluctuations is identified via a Green-function-based analysis of the pressure field.

The role of lateral pipe flow in hillslope runoff response: an intercomparison of non-linear hillslope response

2005 ◽  
Vol 311 (1-4) ◽  
pp. 117-133 ◽  
Author(s):  
Taro Uchida ◽  
Ilja Tromp-van Meerveld ◽  
Jeffrey J. McDonnell
Keyword(s):  
Pipe Flow ◽  
Non Linear
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