The quantification of mountain base elevation based on mountain structure modeling

Abstract

The mountain base elevation, which refers to the initial altitude of a mountain or the mountain altitudinal belt, is of great significance for the study of mountain altitudinal zonality and the mass elevation effect. However, a fast and efficient algorithm for the automatic extraction of a mountain base elevation is still lacking; therefore, a new method based on mountain structure modeling to calculate the mountain base elevation is proposed for the Qinling-Daba Mountains (QDM). The result shows that 1) the mountain structures in different catchments of the Qinling-Daba Mountains can be divided into six types, namely, pyramid, low-diamond, diamond, inverse pyramid, hourglass, and ellipsoid, and each type has a specific distribution law; 2) based on the mountain structure, the calculation result of the mountain base elevation in the Qinling-Daba Mountains ranges from 99 m to 3,979 m, being high in the west, north, and south and low in the east and middle, which is consistent with the overall terrain distribution of the Qinling-Daba Mountains; and 3) there is a good linear correlation between the mountain base elevation and the average altitude in the Qinling-Daba Mountains with R2 = 0.96 (p < 0.01), which also indicates that the mountain base elevation quantification algorithm works well in the mountain areas with a complex terrain.

The Causes and Forecasting of Icing Events on Power Transmission Lines in Southern China: A Review and Perspective

“…In mountainous terrain, the wind field is influenced by microtopography such as terrain uplift and narrow channel effect, and the mean wind speed increases significantly [27]. In addition, the terrain can change the dynamic, thermal, cloud microphysical and other effects of water vapor circulation, thereby affecting the location and intensity of precipitation [28][29][30][31][32][33]. Therefore, microtopography, micrometeorology and terrain-atmosphere interactions are also important aspects of the study of wire icing, which can be divided into three phases: the stage of empirical analysis, the stage of numerical model construction, and the stage of integrated empirical and numerical model simulation.…”