Slope Angle

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Harun Mutlu - One of the best experts on this subject based on the ideXlab platform.

Omer Ozel - One of the best experts on this subject based on the ideXlab platform.

Julien Vallet - One of the best experts on this subject based on the ideXlab platform.

  • variation of deposition depth with Slope Angle in snow avalanches measurements from vallee de la sionne
    Journal of Geophysical Research, 2010
    Co-Authors: Betty Sovilla, J N Mcelwaine, Mark Schaer, Julien Vallet
    Abstract:

    [1] The snow surface height was precisely measured, with a laser scanner, before and after the passage of two dry-mixed avalanches in Vallee de la Sionne during the winter of 2005-2006. The measurements were used to calculate the depth of the deposited snow along each entire avalanche path with a height resolution of 100 mm and a horizontal resolution of 500 mm. These data are much more accurate than any previous measurements from large avalanches and show that the deposit depth is strongly negatively correlated with the Slope Angle. That is, on steep Slopes the deposit is shallow, and on gentle Slopes the deposit is deep. The time evolution of the snow depth, showing the initial erosion and final deposition as the avalanche passed, was also observed at one position using a frequency-modulated continuous wave radar. Measurements at a nearby position gave flow speed profiles and showed that the avalanche tail consists of a steady state subcritical flow that lasts for about 100 s. Eventually, the tail slowly decelerates as the depth slightly decreases, and then it comes to rest. We show that the dependency between the Slope Angle and the deposition depth can be explained by both a cohesive friction model and the Pouliquen h stop model.

Zhongbo Yu - One of the best experts on this subject based on the ideXlab platform.

  • conditions for lateral downSlope unsaturated flow and effects of Slope Angle on soil moisture movement
    Journal of Hydrology, 2013
    Co-Authors: Meixia Lv, Zhongbo Yu
    Abstract:

    Summary The necessary conditions for lateral downSlope flow in the unsaturated zone in hillSlopes have not been clearly identified, and the effects of different Slope Angles on soil moisture movement are rarely studied. These questions were investigated through drying processes in a homogeneous and isotropic sloping soil tank in this study. Three experiments with different Slope Angles were conducted. The results showed that the flow direction in the unsaturated zone gradually rotates counterclockwise from the vertical direction to the lateral downSlope direction parallel to the Slope surface during the drying phase. The lateral downSlope flow parallel to the Slope surface first appears at the surface (0–5 cm) and the bottom of the sandy loam in the tank. The lateral downSlope flow parallel to the Slope surface at the surface is due to the state of drying rather than the no-flow upper boundary condition. The lateral downSlope flow parallel to the Slope surface at the bottom of the sandy loam is also caused by the state of drying. More importantly, the results of this study showed that the rate at which the lateral downSlope flow turns to be parallel to the Slope surface is affected by the drainage rate. In contrast to the lateral downSlope flow component parallel to the Slope surface, the flow component normal to the Slope surface is less sensitive to changes in the Slope Angle. The influence of the Slope Angle on the flow component normal to the Slope surface is greatest in the middle layer.

Osman Orman - One of the best experts on this subject based on the ideXlab platform.