521 Works

Regional level debris-flow hazard assessment for alpine infrastructure facilities using the 3D numerical high-performance simulation tool FIMT

Manfred Scheikl & David Powell
Alpine infrastructure such as roads, railways, pipelines, powerlines and hydropower facilities, as well as alpine communities, are exposed to debris-flow hazards, rock-fall and snow avalanches. In most cases, debris-flows are rainfall induced and affect large areas, causing substantial financial and individual damages. Austrian infrastructure owners are maintaining approximately 5,000 km of railway tracks and at least 1,000 km of high priority highways which are exposed to debris-flow hazards. For assessing potential debris-flow impact along these...

Modeling frequent debris flows to design mitigation alternatives

Joanna Crowe Curran & Pat Flanagan
Debris flows are a common problem in Western Washington State. One persistent location of debris flows is Slide Ridge. Glacial till deposits erode in debris flows which travel to Lake Chelan, passing through the community of Shrine Beach in Washington State. In the early 1990s an unlined debris channel was constructed from the apex of Slide Ridge to Chelan lake and a large debris basin was constructed on the upslope side of the road crossing....

Morphology of debris flow deposits from a 1967 event in Caraguatatuba, Serra do Mar, Brazil, The

Vivian Cristina Dias, Tiago Damas Martins, Marcelo Fischer Gramani, Rebeca Durço Coelho, Helen Cristina Dias & Bianca Carvalho Vieira
Morphological characteristics of debris-flow deposits are a fundamental part of the field study of the process. The deposits show aspects related to flow dynamics, which reflects its main mechanics and enables the correct identification of process. Occurrences of debris flows are quite common in Brazil, especially in the Serra do Mar region, located at the southern/southeastern coast of the country. Geological and geomorphological characteristics and high rainfall indexes contribute to high susceptibility of the process...

Method for predicting debris-flow occurrence based on a rainfall and sediment runoff model, A

Masaharu Fujita, Kazuki Yamanoi & Gohta Suzuki
Based on a basin scale rainfall runoff model, we proposed a prediction method of debris-flow occurrence on steep mountain slopes related to hydrological processes such as the rainfall infiltration, the surface flow and the slope stability. For example, in one case that the soil layer is unsaturated and a landslide does not occur in the slope even though the groundwater level rises in the slope soil layer during a rainfall event, it is unlikely for...

Geometry of factored nuclear norm regularization

Qiuwei Li, Zhihui Zhu & Gongguo Tang

In situ optical diagnostic study of the atomic layer etching of SiO2, An

Ryan J. Gasvoda, Noemi Leick, Alex Van De Steeg, Rafiel A. Ovanesyan, Jeffrey M. Klein, Ranadeep Bhowmich, Eric A. Hudson & Sumit Agarwal

Exploring active subspaces in neural network cost functions

Jonathan W. Helland
Includes bibliographical references.

Microbiological implications of a sulfur-dominated glacial spring system found in the Canadian High Arctic

Christopher B. Trivedi, Graham E. Lau, Alexis S. Templeton, Stephen E. Grasby & John R. Spear
Includes bibliographical references.

Numerical simulation evaluation of compressed gas storage in depleted horizontal wells of low-permeability reservoirs

Muhammad Syamil Bin Muhammad Adib & Luis E. Zerpa
Includes bibliographical references.

Self assembly of a hexagonal non-close packed array at a liquid-liquid interface

Theresa Saenz, Ning Wu & Jingjing Gong

Comparative study of recycling lithium-ion and lead-acid batteries, A

Ben Geller, Timothy R. Ohno & Cynthia Howell

Hydraulic selection to transform and improve activated-sludge based wastewater treatment

Emily Blair, Rudy Maltos, Ryan Holloway, David Charles Vuono & Tzahi Y. Cath
A majority of wastewater plants in the United States use conventional activated sludge (CAS) in their treatment process. While CAS is a common practice, it is not without faults. One of its drawbacks is the difficulty in maintaining the process, as it is often prone to bulking, which is caused by an undesired build up of filamentous bacteria and results in sludge that does not settle. Additional drawbacks include limited space for WWTPs to expand...

Monitoring of rainfall and soil moisture at the Rebaixader catchment (Central Pyrenees)

Marcel Hürlimann, Raül Oorthuis, Clàudia Abancó, Luigi Carleo & José Moya
The instrumental monitoring of torrential catchments is a fundamental research task and provides necessary information to improve our understanding on the mechanisms of debris flows. While most monitoring sites include meteorological sensors and analyze the critical rainfall conditions, only very few contain soil moisture measurements. In our monitoring site, the Rebaixader catchment, 11 debris flows and 24 debris floods were detected during the last nine years. Herein, the initiation mechanisms of these torrential flows were...

Measurements of velocity profiles in natural debris flows: a view behind the muddy curtain

Georg Nagl, Johannes Huebl & Roland Kaitna
The internal deformation behavior of natural debris flows is of interest for model development and model testing for debris-flow hazard mitigation. Up to now, only a view attempts were made to measure velocity profiles in natural debris flows due to low predictability and high destructive power of these flows. In this contribution we present recent advances of measuring in-situ velocity profiles together with flow parameters like flow depth, basal normal stress, and pore fluid pressure....

Impact of global warming on the formation of debris flows in an alpine region of southeastern Tibet, The

Peng Cui, Yang Jia & Dingzhu Liu
Debris flows are one of the typical mountain hazards in the Qinghai Tibet Plateau, and they are also one of the most active and harmful hazards in the southeast of Tibet. Different from the formation mechanism of debris-flow hazard at low altitude, the debris flows in this alpine region are caused by the coupling of glacier movement, snow melting, and precipitation. To get the meteorological conditions in formation area of debris flows at the time...

Complexity of a debris-flow system at Forest Falls, California

Kerry Cato & Brett Goforth
Historical patterns of debris flows have been reconstructed at the town of Forest Falls in the San Bernardino Mountains using a variety of field methods (mapping flow events after occurrence, dendrochronology evidence, soil chrono sequences). Large flow events occur when summer thunderstorms produce brief high-intensity rainfall to mobilize debris, however the geomorphic system exhibits properties of non-linear response rather than being a single-event precipitation-driven process. Previous studies contrasted the relative water content of flows generated...

Numerical study of debris flows in presence of obstacles and retaining structures: a case study in the Italian Alps

Marina Pirulli, Mario Manassero, Carmine Terrioti, Alessandro Leonardi & Giulia La Porta
Debris flows are one of the most frequent mass movement processes and occur in all regions with steep relief and at least occasional rainfall. Their high flow velocity, impact forces, and long runout, combined with poor temporal predictability, cause debris flows to be one of the most hazardous landslide types. An essential aspect of debris-flow risk management is the design of mitigation measures, which reduce the existing risk to an accepted level of residual risk,...

Long travel distance of landslide-induced debris flows

Yuki Nishiguchi & Taro Uchida
Large-scale landslides often induce debris flows and cause serious damage to humans. These events typically have water contents in the landslide mass less than 60% and sediment concentrations more than 40%. In spite of high sediment concentrations, landslide-induced debris flows can runout long distances. For large-scale stony debris flows, many previous studies have suggested that coarse gravels behave as a solid phase, whereas fine particles with interstitial water can behave as a fluid phase. We...

Study of multiaxial micromechanics in magnesium alloys

Zach Brunson, Garrison Hommer, Branden Kappes, Aaron P. Stebner, Rich Becker, Jeff Lloyd, Jun-Sang Park & Jonathan Almer
Includes bibliographical references.

Borehole thermal energy storage: a long term energy storage solution

Michael L. Lanahan & Paulo Cesar Tabares-Velasco
Includes bibliographical references.

Modeling of geomechanical stress distribution during polymer injection for enhanced oil recovery

Arun Kaashyap Arunachalam

Highly insidious extreme phishing attacks, The

Rui Zhao, Samantha John, Stacy Karas, Cara Bussell, Jennifer Roberts, Daniel Six, Brandon Gavett & Chuan Yue

Innovative computational approach for modeling thermo-hydro processes within enhanced geothermal, An

Kamran Jahan Bakhsh & Masami Nakagawa

Investigating the metastabilities surrounding hydrogen hydrates for energy storage applications

Michelle Shebowich, Melissa Arias, Robert Gary Grim, Prasad Kerkar, Amadeu Sum & Carolyn Koh
Hydrogen hydrate in its most thermodynamically stable form, sII, holds a maximum 3.8 wt. % hydrogen, less than the 5.5 wt. % needed to meet the Department of Energy 2015 goal. This novel work explored H2 hydrate structure, occupancy, and metastability during seeding/templating and guest substitution to ultimately increase hydrogen storage capacity in hydrates. The phenomenon of templating was evaluated by mixing pre-formed hydrate of a desired structure with ice to propagate its structure with...

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