Now showing items 1-20 of 135

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

        Author(s):Cui, Kahlil F. E.; Zhou, Gordon G. D.
        Date Issued:2019
        Format:born digital; proceedings (reports)
        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 ...
      • Erosion by experimental debris flows: particle size effects 

        Author(s):Ghasemi, A.; Kaitna, R.; Fritton, P.; Blankenship, B. T.; Feng, Q.; Densmore, A.; de Hass, T.; Hill, K. M.
        Date Issued:2019
        Format:born digital; proceedings (reports)
        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 ...
      • How does particle-size segregation affect the fluidity of multi-granular debris flows? 

        Author(s):Hotta, Norifumi; Iwata, Tomoyuki; Suzuki, Takuro
        Date Issued:2019
        Format:born digital; proceedings (reports)
        It is essential to consider the fluidity of a debris-flow front when calculating its impact. Here, we flume-tested monogranular and bigranular debris flows, and compared the results to those of numerical simulations. We ...
      • Valid debris-flow models must avoid hot starts 

        Author(s):Iverson, Richard M.; George, David L.
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Debris-flow experiments and models commonly use “hot-start” initial conditions in which downslope motion begins when a large force imbalance is abruptly imposed. By contrast, initiation of natural debris flows almost ...
      • Role of topography on the volume of material eroded by debris flows, The 

        Author(s):Kudo, Tsukasa; Uchida, Taro; Sakurai, Wataru
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Prediction of sediment volume of debris flows is the most important factor for designing debris-flow control structures or estimating debris-flow prone area. It has been considered that debris-flow volume may increase due ...
      • Numerical investigation of deposition mechanism of submarine debris flow 

        Author(s):Liu, Dingzhu; Cui, Yifei; Choi, Clarence E.; Bazai, Nazir Ahmed; Yu, Zhilin; Lei, Mingyu; Yin, Yanzhou
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Submarine debris flow can damage oil and gas transport pipelines with potentially adverse consequences to the environment and to the industrial activity itself. The deposition process of submarine debris flow, which is ...
      • Compressibility of solid phase of debris flow and erosion rate 

        Author(s):Miyamoto, Kuniaki; Itoh, Takahiro; Kisa, Hiroshi
        Date Issued:2019
        Format:born digital; proceedings (reports)
        The change in sediment concentration of debris flow causes erosion and sedimentation of the solid phase of debris flows. Moreover, the changing affects the mobility of the flow. Therefore, knowledge of the mechanism of the ...
      • Commonalities between debris flows and flow failures 

        Author(s):Moss, Robb Eric S.
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Debris flow and flow failure are terms used to describe large displacement slope failures. The initiation or triggering often differs due to the nature and state of the material, but once triggered these two failure ...
      • Soil characteristics of long-traveling landslides and a hybrid model to predict travel distance 

        Author(s):Usuki, Nobuhiro; Yoshino, Kousuke; Mizumaya, Takahisa
        Date Issued:2019
        Format:born digital; proceedings (reports)
        When landslides liquefy and sediment movement takes on characteristics of a debris flow, travel distance increases, expanding the range of potential damage. Clarifying the liquefaction mechanism for such phenomena and ...
      • Research on the movable solid materials under seepage flow effect in debris flow source area, The 

        Author(s):Yang, Shun; Ou, Guo-qiang; Pan, Hua-li; Xie, Zhong-sheng; Yang, Dong-xu
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Solid materials distributed on the surface of watershed transform to debris flow under seepage flow effect is one of the most common disaster type in the mountainous area, especially in the Longmen Fault regions, China. ...
      • Overcoming barriers to progress in seismic monitoring and characterization of debris flows and lahars 

        Author(s):Allstadt, Kate E.; Farin, Maxime; Lockhart, Andrew B.; McBride, Sara K.; Kean, Jason W.; Iverson, Richard M.; Logan, Matthew; Smith, Joel B.; Tsai, Victor C.; George, David
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Debris flows generate seismic signals that contain valuable information about events as they unfold. Though seismic waves have been used for along-channel debris-flow and lahar monitoring systems for decades, it has proven ...
      • Topographic change detection at Chalk Cliffs, Colorado, USA, using airborne lidar and UAS-based Structure-from-Motion photogrammetry 

        Author(s):Barnhart, Katherine R.; Rengers, Francis K.; Ghent, Jessica N.; Tucker, Gregory E.; Coe, Jeffrey A.; Kean, Jason W.; Smith, Joel B.; Staley, Dennis M.; Kleiber, William; Wiens, Ashton M.
        Date Issued:2019
        Format:born digital; proceedings (reports)
        The Chalk Cliffs debris-flow site is a small headwater catchment incised into highly fractured and hydrothermally altered quartz monzonite in a semiarid climate. Over half of the extremely steep basin is exposed bedrock. ...
      • Forecasting and seismic detection of debris flows in pro-glacial rivers at Mount Rainier National Park, Washington, USA 

        Author(s):Beason, Scott R.; Legg, Nicholas T.; Kenyon, Taylor R.; Jost, Robert P.; Kennard, Paul M.
        Date Issued:2019
        Format:born digital; proceedings (reports)
        The glaciated Mount Rainier volcano in Southwestern Washington State (USA) has a rich history of outburst floods and debris flows that have adversely impacted infrastructure at Mount Rainier National Park in the 20th and ...
      • Deciphering sediment dynamics in a debris flow catchment: insights from instrumental monitoring and high-resolution topography 

        Author(s):Coviello, Velio; Theule, Joshua I.; Marchi, Lorenzo; Comiti, Francesco; Crema, Stefano; Cavalli, Marco; Arattano Massimo; Lucía, Ana; Macconi, Pierpaolo
        Date Issued:2019
        Format:born digital; proceedings (reports)
        In mountainous catchments, the quantification of sediment yield is of paramount relevance for land-use planning and design of sediment control structures. However, deciphering the contribution of the different sediment ...
      • Examining the impact force of debris flow in a check dam from small-flume experiments 

        Author(s):Eu, Song; Im, Sangjun
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Debris flow is one of the most hazardous disasters in mountain regions of Korea. Rainfall-induced debris flows have occurred more frequently during past decades due to climate changes. Especially, its threat on many lives ...
      • Vibrational characteristics of debris flow in Taiwan, The 

        Author(s):Huang, Yi-Min; Fang, Yao-Min; Yin, Hsiao-Yuan
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Debris flows have become a common disaster in Taiwan in recent years since the impacts of extreme weathers has been aggravated. To protect people from the debris-flow disasters, a monitoring and warning system was developed ...
      • Monitoring and modeling of debris-flow surges at the Lattenbach creek, Austria 

        Author(s):Huebl, Johannes; Arai, Muniyuki; Kaitna, Roland
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Debris-flow events are often comprised by a sequence of surges, sometimes termed roll waves. The reason for this surging behavior is still a matter of debate. Explanations include the growth of hydraulic instabilities, ...
      • Monitoring of rainfall and soil moisture at the Rebaixader catchment (Central Pyrenees) 

        Author(s):Hürlimann, Marcel; Oorthuis, Raül; Abancó, Clàudia; Carleo, Luigi; Moya, José
        Date Issued:2019
        Format:born digital; proceedings (reports)
        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 ...
      • Debris flow monitoring using load cells and pressure sensors on Sakura-jima Island 

        Author(s):Itoh, Takahiro; Fujimura, Naoki; Katou, Hitoshi; Tagata, Satoshi; Mizuyama, Takahisa
        Date Issued:2019
        Format:born digital; proceedings (reports)
        Numerous debris flows have recently taken place frequently in Sakura-jima Island located at southwest in Japan due to rainfall events after ash deposition due to volcanic activities since 2010. Debris-flow measurement ...
      • Implementation of an integrated management strategy to deal with landslide triggered debris flows: the Valloire case study (Savoie, France) 

        Author(s):Laigle, Dominique; Jongmans, Denis; Liebault, Frédéric; Baillet, Laurent; Rey, Etienne; Fontaine, Firmin; Borgniet, Laurent; Bonnefoy-Demongeot, Mylène; Ousset, Frédéric
        Date Issued:2019
        Format:born digital; proceedings (reports)
        The Rieu Benoît is a debris-flow-prone catchment located in Valloire (Savoie, France). In 2011, a lateral landslide was detected about 600 m upstream of the fan apex where houses are present. This landslide has evolved ...