Abstract
Abstract. Landslide-induced wave in lakes or offshore is a natural hazard of significant concern throughout the world. In Turkey, several dam reservoir areas suffer from this problem, motivating for the exploration of this phenomenon. In this study, the potential for landslide-induced wave generation and the possible adverse effects of such an event were investigated for the Kurtun Dam reservoir area. This area is prone to translational debris-type landslides, and such slides represent a threat with respect to wave generation. To investigate this problem, a potential landslide was initially inspected with respect to key geometrical and index parameters, such as the internal friction angle and unit weight of the landslide material. After obtaining these data, the potential of sub-aerial landslide-induced wave characteristics such as wave height, wave run-up on the opposite slope and wave velocity were calculated using existing empirical relationships. Based on the obtained wave properties, a potential damage assessment was performed for vulnerable areas in recognition of the fact that the Kurtun Dam and Kurtun district are threatened by potential wave occurrence. According to the findings obtained from the potential damage assessment, it was determined that the Kurtun district and the Kurtun portion of the Kurtun-Gumushane highway are located within the run-up impact area. However, the Kurtun Dam was determined to be relatively safe due to the distance between the landslide area and the dam.
Highlights
Rapid landslides can entre reservoirs and, depending on their velocity, generate impulsive waves, which propagate, reaching sillages and causing considerable destruction, as has occurred previously (Pastor et al, 2009)
This paper aims to describe the potential landslide mass, to discuss monitoring of the landslide movement using geodetic deformation measurements, and to investigate empirical models for determination of the height, speed, run-up and adverse effects of the potential landslide-generated waves
Using the values previously cited for α, γs, γ, and d, a landslide volume (Vs) of 1 320 000 m3, a distance (x) of 330 m to the middle of the reservoir area and a finite shore distance (b) equal to the width of the region of impact along the shore, which correspond to the average width of the landslide (340 m), Eq (5) yields a wave height of 32.11 m
Summary
Rapid landslides can entre reservoirs and, depending on their velocity, generate impulsive waves, which propagate, reaching sillages and causing considerable destruction, as has occurred previously (Pastor et al, 2009). This paper aims to describe the potential landslide mass, to discuss monitoring of the landslide movement using geodetic deformation measurements, and to investigate empirical models for determination of the height, speed, run-up and adverse effects of the potential landslide-generated waves. For this purpose, index parameters and some geometric features of the landslide mass were initially determined. Index parameters and some geometric features of the landslide mass were initially determined Using these features, the results of modelling waves in the reservoir area using previously developed models to derive a range of values for potential wave height, run-up, and speed were examined. Based on these findings, the areas potentially at risk were determined in a geographical information system (GIS) environment
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