521 Works

Possibilities and limitations for the back analysis of an event in mountain areas on the coast of São Paulo State, Brazil using RAMMS numerical simulation

Claudia Vanessa Dos Santos Corrêa, Fábio Augusto Gomes Vieira Reis, Lucília Do Carmo Giordano, Victor Carvalho Cabral, Débora Andrade Targa & Hermes Dias Brito
Debris flows are mass movements that develop along drainage networks and involve generally dense fluids, compose of materials of different grain sizes, as well as woods and variable amounts of water, identified as natural processes that constitute the dynamics and the modeling of the landscape. The areas most susceptible to the occurrence of these processes in Brazil are in the foothills of the Serra do Mar, Serra da Mantiqueira and the Serra Geral, and on...

Empirical model for assessing dynamic susceptibility of post-earthquake debris flows

Kaiheng Hu, Zhang Wang, Cheng Chen & Xiuzhen Li
Debris-flow susceptibility is controlled not only by static effective factors such as topography and lithology, but also by dynamic effective factors such as earthquake, rainfall and human activity. In this paper, a simple model of calculating the dynamic susceptibility is developed based on the assumption of linear relationship between the static and dynamic susceptibilities. The influence of earthquake and rainfall events is represent by two coefficients. The earthquake coefficient is considered as an exponential function...

Roles of barrier location for effective debris flow mitigation: assessment using DAN3D

Shin-Kyu Choi, Tae-Hyuk Kwon, Seung-Rae Lee & Joon-Young Park
Debris flows can travel at rapid velocities and can cause economic and societal damages. Accordingly, barriers that can dissipate the energy of debris flows are frequently installed as a mitigation measure. However, the effect of barriers on debris-flow behavior is not fully understood. In this study, we used DAN3D to investigate the interactions between a debris flow and barriers, and evaluate the effect of barrier location on debris-flow velocity and volume. We chose a study...

Dynamic characteristics of extreme superelevation of debris flows observed by laser profile scanners in Sakura-jima volcano, Japan

Yuya Takahashi, Naoki Fujimura, Hiromi Akita & Masaki Mizuno
Supercritical flows in natural open channel show very complicated behavior due to shockwaves, roll waves, and superelevations. Traces of debris flows often show large difference in height at inner and outer sides of curved channels, and not only that, superelevation of debris flow is larger than that of pure water. This behavior of debris flow may cause underestimation of channel section design or unexpected bank erosion. Therefore, accumulation of observation data is important to estimate...

Numerical simulation for evaluating the phase-shift of fine sediment in stony debris flows

Taro Uchida, Yuki Nishiguchi, Brian W. McArdell & Yoshifumi Satofuka
To predict hazard-endangered areas and debris-flow velocity, a variety of physically-based numerical simulation models have been developed. In these models, the relatively large sediment particles such as boulders move as a laminar flow, but the interstitial fluid between sediments behaves like a turbulent flow. Moreover, several recent models assumed that fine sediments act as a fluid. This behavior of fine sediment is referred to as the “phase-shift” of fine sediment. However, because it is difficult...

Numerical investigation of particle size segregation in saturated granular flows using CFD-DEM coupling approach

Kahlil F. E. Cui & Gordon G. D. Zhou
Particle size segregation is a common feature in debris-flow deposits and is assumed to develop in a similar way as in dry granular flows where fluid forces are neglected. Solid-fluid coupling however is a defining feature of debris flows and fluid forces must therefore be accounted for in modelling for the segregation that develops therein. This paper presents a numerical investigation of the mechanisms of segregation under the influence of fluid forces. For this, a...

Identification of the carbon incorporation mechanism during atomic layer deposition of SiCxNy using in situ ATR-FTIR spectroscopy

Rafaiel A. Ovanesyan, Noemi Leick, Kathryn M. Kelchner, Dennis M. Hausmann & Sumit Agarwal

Effect of surface layer on evaporation from porous media

Zhen Li & Kathleen M. Smits
Includes bibliographical references.

Synthesis of heterotriangulene electron-transport material for perovskite solar cells

Erin E. Meyers, Tracy H. Schloemer, Joshua T. Koubek & Alan Sellinger

Mines and the research game

J. M. Poate
This presentation provides a summary of Mines research in terms of strategy and players, a status update, the future and its challenges. Included are annual research expenditure for 2004-2012 and technology transfer growth over the last five years. This presentation was given for a President's Council Alumni update and for the Foundation Board of Governor's meeting.

2013 Faculty Conference: student life update

Daniel Fox
This presentation gives a summary of student information. The follwowing topics are included: 1) a 5-year summary of the number of incoming and transfer students and SAT/ACT scores, 2) 2013 demographics, 3) 3-year undergraduate enrollment numbers, 4) advanced placement credit distribution and 5) highlights from CASA and faculty.

2012 land cover maps with 30m and 50m spatial resolution

Nicolás Rodríguez-Jeangros, Amanda S. Hering, Timothy Kaiser & John E. McCray
SCaMF-RM fuses the information of six land intermediate to high resolution land cover products in the Rocky Mountains (RM) at two high spatial resolutions, 30 and 50 meters, and a yearly frequency for the period 1983 – 2012. The development of the fused products is based on the Spatiotemporal Categorical Map Fusion (SCaMF) methodology

1983 land cover maps with 30m and 50m spatial resolution

Nicolás Rodríguez-Jeangros, Amanda S. Hering, Timothy Kaiser & John E. McCray
SCaMF-RM fuses the information of six land intermediate to high resolution land cover products in the Rocky Mountains (RM) at two high spatial resolutions, 30 and 50 meters, and a yearly frequency for the period 1983 – 2012. The development of the fused products is based on the Spatiotemporal Categorical Map Fusion (SCaMF) methodology

Making Alma work for you: optimize service at the Colorado School of Mines

Laura Guy & John Larson
Having successfully migrated to Alma last year, the Colorado School of Mines wanted to get the most out of their shiny new Library Management System, and so six months after going live decided to take advantage of the new Optimization Service offered by Ex Libris. Come learn about this exciting and important new Service, why the Library decided to embark upon such an adventure, the ways staff prepared for traveling this route, and how Mines...

Reproducibility of debris-flow fan physical modeling experiments

Kailey Adams, Thad Wasklewicz, Tjalling De Haas, Scott Lecce & Paul Gares
Debris-flow fans are common in steep mountainous terrain. The complexity of these environments makes it difficult to be onsite at the time of the debris flow, which has led many researchers to turn to physical models. While physical models have played an integral role in unraveling how alluvial fans have been developed, little work has been done to test and validate the approaches and results reported in physical models. Here, we replicated a debris-flow physical...

Making sense of avulsions on debris-flow fans

Alexander L. Densmore, Tjalling De Haas, Brian W. McArdell & Peter Schuerch
Avulsions remain a critical but understudied aspect of debris-flow fans and flow hazard. A substantial body of work on fluvial systems provides a conceptual framework for understanding avulsions, but equivalent research on debris-flow systems has lagged behind. A small but growing set of field examples and analogue experiments shows that many, but not all, avulsions on debris- flow fans follow a relatively predictable ‘avulsion cycle’ that consists of (1) deposition of debris-flow material in the...

Debris-flow susceptibility mapping in Colorado using Flow-R: calibration techniques and selected examples

Kevin M. McCoy
The Colorado Geological Survey (CGS) has been using ArcGIS in combination with Flow-R to prepare county-wide debris-flow susceptibility maps for 43 counties in 13 priority areas comprising the mountainous portions of the state. Limited personnel, site access, and limited records of recent events constrain the CGS’s ability to calibrate models based on historical data or field observations. In response to these limitations, the CGS has developed methods to parameterize county-wide debris-flow source area and inundation...

Effect of environmental aging on the mechanical properties of PMMA material used in concentrating photovoltaics, The

Joseph D. Carloni, Taylor M. Wilkinson, David C. Miller & Corinne E. Packard
Concentrating photovoltaics (CPV) modules use focused light. A frensed lens requires less material and is lighter than a bulky and expensive traditional domed lens. A promising lens material is poly(methyl methacrylate) or PMMA. This polymer is a lightweight and mechanically robust optical grade material, benefitting the CPV application. It is relatively unknown how its performance will be affected by environmental weathering conditions. An ATLAS Ci-4000 Weather-Ometer simulates environmental wreathing at >8x acceleration. The samples tested...

Understanding trends in methane production and producers in anaerobic waste water treatment

Jennifer Feigin, Andrew Pfluger, Lynne Albert, Mengyuan Yu, Gary Vanzin, Linda A. Figueroa & Junko Munakata Marr

Synthesizing crosslinked hole transport materials for improved perovskite solar cell stability and performance

Dakoda J. Bradley, Jonathan Tinkham & Alan Sellinger

Thermal cycling chamber to determine effects of temperature cycling on window samples

Kayleah Griffen, Abhishek Singh & Eric Toberer
Single pane windows are a source of energy loss, however in many cases it is not economical and not structurally suitable to replace them for energy efficient windows. A new window technology is being developed to create energy efficient, single pane windows. Thermal cycle testing (ASTM Standard Designation: E2264 − 05) is a requirement for new windows and the presented work is focused on the design, analysis and construction of a thermal cycling chamber for...

Erosion by experimental debris flows: particle size effects

A. Ghasemi, R. Kaitna, P. Fritton, B. T. Blankenship, Q. Feng, A. Densmore, T. De Hass & K. M. Hill
The mobilization of surface material by particle-laden flows involves phenomenology that cross multiple scales: particle-scale interactions and mesoscopic stresses have significant implications for landscape evolution and associated hazard mitigation issues. Here, we consider the problem of erosion of bed materials by debris flows – flows of boulders, gravel, sand, fine particles, and fluids – as they entrain soils and rocks from steep hillsides. In this paper we report results from laboratory experiments investigating the effect...

Statistical shape model for probabilistic studies of the lumbar spine, A

Kelli S. Huls & Anthony J. Petrella
Introduction: Computational modeling of the spine has become a promising option for evaluating the performance of new spinal implants and procedures before they are used in patients. Most models in the literature only represent a single subject and neglect normal variation that exists between specimens. However, using a probabilistic simulation (select input variables from a normal distribution and determine how they affect outputs) of virtual patients, whose geometries are representative of actual patients, may lead...

Effect of rheological properties on debris-flow intensity and deposition in large scale flume experiment

Ba-Quang-Vinh Nguyen, Ji-Sung Lee, Yun-Tae Kim, Seung-Rae Lee & Tae-Hyuk Kwon
Debris flows are one of the most serious hazards in the mountainous areas. To assess and mitigate the debris-flow hazard, debris- flow intensities and deposition on fans must be estimated. Rheological properties including yield stress and viscosity are major parameters to describe and predict behaviors of debris flow. In the present study, the effect of rheological properties on debris-flow intensities and deposition on fans of natural clay was investigated using large scale flume experiments. The...

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