Numerical Simulation of the Topographical Change in Korea Mountain Area by Intense Rainfall and Consequential Debris Flow

Jun, Byong-Hee

doi:10.1155/2016/9363675

Cited by 10 publications

(5 citation statements)

References 45 publications

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“…Airborne LiDAR was used by [6,32,51] to estimate deposition volumes of debris flows. [31,44] used terrestrial laser scanning (TLS) to determinate the dynamics of a slow moving landslide and debris flows for subsequent model simulations. Some studies also used a combination of both methods [7,20,22].…”

Section: Discussionmentioning

confidence: 99%

Evaluation concepts to compare observed and simulated deposition areas of mass movements

2017

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The simulation of geophysical mass flows, including debris flows, rock and snow avalanches, has become an important tool in engineering hazard assessment. Especially the runout and deposition behaviour of observed and expected mass flows are of interest. When being confronted with the evaluation of model performance and sensitivity, there are no standard, objective approaches. In this contribution, we review methods that have been used in literature and outline a new approach to quantitatively compare 2D simulations of observed and simulated deposition pattern. Our proposed method is based on the comparison of normalized partial areas which can be plotted in a ternary diagram to visualize the degree of over-and under-estimation. Results can be summed up by a single metric between -1 (no fit) and 1 (perfect fit). This study shall help developers and end-users of simulation models to better understand model behaviour and provides a possibility for comparison of model results, independent of simulation platform and type of mass flow.

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Section: Discussionmentioning

confidence: 99%

Evaluation concepts to compare observed and simulated deposition areas of mass movements

2017

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“…The 3D laser scanner is generally used for an on-site topographical survey [19][20][21], and topographical data is obtained by using a laser sensor and a wide-angle camera that were recently installed on the drone [22,23]. However, up until now, no 3D scanner has been used for measurement in relation to movable-bed tests, and there has been little research to suggest that any accurate analysis results have been obtained.…”

Section: Physical Model Testmentioning

confidence: 99%

Investigation of Coastal Environment Change Using Wave Measurement Sensors and Geographical Laser Scanner

2019

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The construction of large-scale coastal structures in any coastal area may not only have direct effects on the coastal environment in that vicinity but also cause severe property damage. In order to prevent this problem, probable effects should be appreciated before any construction and the mechanism that may cause any probable damage must be accurately analyzed along with the plans to minimize damage. This study sought to analyze the cause and mechanism of damage inflicted on coasts by artificial structures through reviewing beach erosions that have occurred on beaches on the east coast of Korea after the large-scale construction of artificial structures, for which wave heights were measured in the vicinity of those structures, and the correlation between the measurements and the analysis data of waves and coastal erosion on the surrounding beach was analyzed. In addition, the correlation between coastal erosion and wave data was applied in order to understand what impact large waves have in relation to sand loss. Accordingly, a movable-bed physical model test was employed to appraise the factors that cause coastal erosion to take place.

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“…Global Navigation Satellite System (GNSS) enables low-cost and efficient landslide monitoring [18][19][20][21]. Terrestrial laser scanning (TLS) provides 3-D information with high density point cloud data and can generate DSM (Digital Surface Model) having very high resolution [22][23][24][25]. Some commonly used research methods include the assessment of risks by recording the locations where a mass movement occurred and building a database of activity [26,27], numerical modelling for the prediction of the range and impulse of the landslide and debris flow by using a dynamic model [28][29][30], and experiments reproducing the actual phenomena [31]; all these which can be enhanced by information gathered through remote sensing techniques.…”

Section: Introductionmentioning

confidence: 99%

Title Time-Series Analysis of Slope Displacements Using UAV Photogrammetry and Its Relationship With Rainfall Intensity

Jun¹,

Macciotta²,

Kim³

2023

Preprint

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In this study, UAV (Unmanned Aerial Vehicle) photogrammetry was used to monitor the ground displacement on the slope below a coal waste-rock stockyard, and to investigate the role of rainfall on this displacement. The study area is a mountainous region in Korea, where coal mining continues, and coal waste-rock is stored on the slopes of the mountain. In this area, ma-terial removal work was undertaken to reduce the steepness of the slope and driving forces in order to prevent disasters, but the strategy requires continuous monitoring to confirm the stabilization of the slope. For slope monitoring, a total of six UAV photogrammetry campaigns were conducted between April 2019 and August 2020. As a result of data processing, an orthoimage and DSM (Digital Surface Model) were generated. The ground displacement was estimated through four ways: slope extraction, displacement area evaluation, horizontal displacement, and vertical displacement analysis. During the study period, the maximum vertical displacement was 3.3 m and the maxi-mum horizontal displacement was 3.5 m. The horizontal displacement was effectively evaluated through the measurement of the movement of the drainage system using orthoimages that captured with a periodic survey. The effects of rainfall on ground displacement were also investigated. A very clear linear relationship between rainfall intensity higher than 20mm/d and ground displacement was identified. Accumulated amount of rainfall also showed good correlation with slope movement, but the frequency of rainfall intensity below 20 mm/d showed relatively low correlation with ground dis-placements.

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Numerical Simulation of the Topographical Change in Korea Mountain Area by Intense Rainfall and Consequential Debris Flow

Cited by 10 publications

References 45 publications

Evaluation concepts to compare observed and simulated deposition areas of mass movements

Evaluation concepts to compare observed and simulated deposition areas of mass movements

Investigation of Coastal Environment Change Using Wave Measurement Sensors and Geographical Laser Scanner

Title Time-Series Analysis of Slope Displacements Using UAV Photogrammetry and Its Relationship With Rainfall Intensity

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