Yii-Wen Pan - Profile on Academia.edu (original) (raw)

Papers by Yii-Wen Pan

A pebble/cobble passing a head drop tends to carry a large impact momentum when it hits a grounds... more A pebble/cobble passing a head drop tends to carry a large impact momentum when it hits a groundsill; the heavy impact may result in the breakage of concrete. This study explores the mechanics and the principles of this issue by computational fluid dynamics with particle tracking. The results reveal that the kinematics of a single particle passing a head drop is primarily affected by the size of particles. A small particle tends to travel along the flow lines and brings relatively low impact energy. A large particle is more affected by gravity; saltation is more likely and will carry relatively high impact energy. The major role of the discharge magnitude is just to enable the transportation of larger particles to the downstream. With the simulation, it is possible to evaluate the impact position, load and kinetic energy. The locations prone to damage and failure potential can then be identified.

Site characterization for the investigation of tunnel 8 collapse

Modifications of the erodibility index method for the evaluation of the soft bedrock erosion

Degradation of weak sandstone and continuum damage model

無人飛行載具於大規模崩塌潛勢區之輔助調查- 以高雄市六龜區D015 大規模崩塌潛勢區為例

Journal of the Chinese Institute of Civil and Hydraulic Engineering, Nov 1, 2019

Effect of sediment concentration on the erosion of weak rocks evaluated by mini jet tests

Characterization of soft rocks in Taiwan

Exploring the Geomorphic Features of Landslides Using Hilbert-Huang Transform Method: a Landslide in Southern Taiwan as an Example

Reconstruction of Rainfall-induced Landslide Dam by Numerical Simulation -The Barrier Lake in Taimali River as an Example

Landslides induced by heavy rainfall or earthquake sometimes result in the blockage of river flow... more Landslides induced by heavy rainfall or earthquake sometimes result in the blockage of river flow to form barrier lakes. Relevant data are important for understanding the formation and stability of landslide dams; the inventory of the fundamental landslide-dam data is hence essential. According to the statistics of recorded cases, landslide dams often breach in a short time. As a consequence, it is often difficult to collect comprehensive information of a landslide dam with a short life after dam breach. It is, however, possible for case reconstruction of a breached landslide dam through various methods. This study made use of the particle-flow simulation code PFC to model the processes of the formation and evolution of landslide dams induced by heavy rainfall. In the past, the common approach to trigger a landslide’s initialization by the particle-flow simulation is to substantially reduce the inter-particle frictional coefficient. However, this approach may lead to incorrect inter...

A field study of induced slope failure in poorly cemented rock

Deformation Characteristics of Geomaterials / Comportement Des Sols Et Des Roches Tendres, 2003

Scour and Erosion, 2016

One reach that locates in the midstream of the Touqian River in northern Taiwan was subjected to ... more One reach that locates in the midstream of the Touqian River in northern Taiwan was subjected to various human disturbances; the channel morphology in the reach changed severely as a result. This case study looks into the role of human disturbance on channel evolution by exploring the chronological change in channel morphology due to human influences in the studied reach. The major human influences in this reach include gravel mining, bridge construction and its protection works, and weir construction. Channel morphology downstream the bridge was transformed from an alluvial channel to a bedrock channel since the installation of a massive protection work. Later on, the bridge and its protection work were broken in recent years. After their failure, the reach started to take re-deposition and has returned to an alluvial channel. Chronological data including aerial photographs, cross-section surveys and hydrological data were compiled and analyzed. Also, field geology was conducted to characterize the distribution of bedrock outcrop and the erosion processes in the studied reach. According to the study results, the maximum depth of bedrock incision exceeds 15 meters. Main influences can be attributed to various human activities and the low resistance of young sedimentary rocks to erosion. The case study, as a fine example, demonstrates the processes of channelmorphology change due to human disturbances.

The geomorphological features of a large scale deep-seated landslide in the Luchang area, Taiwan

EGU General Assembly Conference Abstracts, Apr 1, 2016

The scour on hydraulic structures could be reducing its stability due to the caused foundations d... more The scour on hydraulic structures could be reducing its stability due to the caused foundations damage. Therefore, determining the local scour holes downstream of hydraulic structures plays an important role in their planning and design stages. This study aims to propose an approach for estimating the shape and the depth of the scour hole on weak rocks. In this study, several dam sites information were collected and compared with approach method. The results were compared with field data; the compared results show that presented methods were appropriate to freefall condition but underestimation with the locations and the shape of the ski-jump condition. Alternatively, the approach method has obvious improvement compared with evaluate current methods.

Numerical model for estimating underground temperature distribution

Loading behavior of shallow foundation on poorly cemented sandstone

ABSTRACT: This paper aims to investigate the load bearing behavior and failure mechanism of a sha... more ABSTRACT: This paper aims to investigate the load bearing behavior and failure mechanism of a shallow foundation on poorly cemented rock. A series of laboratory material and model tests with specimens made of artificial soft rock were conducted. The results of material tests show that the properties of the artificial material are quite close to natural poorly cemented sandstone. The results of model bearing test indicate that a load-settlement curve can be roughly divided into the incipient stage, the linear stage, the yielding stage, and the final stage. The failure zones and mechanism were also identified. Failure zones were divided into the active zone, the transitional zone, and the passive zone. It was found that the bearing behavior on poorly cemented sandstone is distinct from the cases on hard rock or soil, with both plasticity and brittle characteristics. The bearing capacity formulas commonly used for soil or hard rock is not necessarily suitable for the case of poorly cemented soft sandstone.

1Research Engineer, Natural Hazard Mitigation Research Center, National Chiao-Tung University, Hs... more 1Research Engineer, Natural Hazard Mitigation Research Center, National Chiao-Tung University, Hsinchu, Taiwan (1001 Ta Hsueh Road, Hsinchu, Taiwan 300) E-mail: mingwan@mail.nctu.edu.tw 2Engineer, Water Resources Planning Institute, Water Resources Agency, Ministry of Economic Affairs, Taichung, Taiwan (1340 Jhong Jheng Road, Wufong Township, Taichung County, Taiwan 413) E-mail: chengms@wrap.gov.tw 3Professor, Department of Civil Engineering and Natural Hazard Mitigation Research Center, National Chiao-Tung University, Hsinchu, Taiwan (1001 Ta Hsueh Road, Hsinchu, Taiwan 300) E-mail: jjliao@mail.nctu.edu.tw; ywpan@mail.nctu.edu.tw

Geologic model and geomorphic features of a large paleo rockslide at Jiasian in Southern Taiwan

EGU General Assembly Conference Abstracts, Apr 1, 2019

Accumulative damage and dissipated energy during saltation abrasion of soft rock – a micromechanics perspective

Proceedings of the 7th International Conference on Scour and Erosion, Perth, Australia, 2-4 December 2014, 2014