Correlation Analysis of Gradient and Elevation in Henan Province

Kai-guang ZHANG, Ming-ting BA, Hong-ling MENG, Yan-min SUN

Abstract


Gradient is an important terrain factor in describing the regional topographic features from elevation and slope. Based on 30m×30m digital elevation model, this paper uses geo-statistical analysis methods to analyze the spatial distribution features of elevation, slope and gradient from the aspect of structure and proportion, and discusses the spatial correlation between gradient and elevation in Henan province, in order to provide some scientific reference for further understanding of its regional terrain. The results show that the topography of the province is dominated by low and medium altitude elevation, the elevation maximum values on longitude lines show 4 ladders, and there is a north-south wind tunnel with average maximum elevation lower than the standard mountain it located in each ladder. On the latitude lines, the elevation maximum values show 3 ladders, the wind tunnel width on the first ladder is the widest, which affects the climate change in the southeast part of the province. The topography of the province is dominated by low terrain slope, the maximum values show 3 ladders on longitude lines, 2 ladders on latitude lines, the change frequency and amplitude of the slope in the southern are significantly smaller than those in the northern part. The slope range on the latitude is extremely higher than that on the latitude. The terrain gradient shows 3 ladders with the decrease average maximums on longitude lines, the change in the second ladder is obviously higher than that in other ladders, it shows 2 ladders on latitude lines, the gradient change frequency and amplitude in the southern are significantly higher than that in the northern part. The varying curve of gradient versus the elevation varying shows a normal distribution, the extreme value appears at elevation 1000m. The gradient standard deviation in different elevation belts are always less than the elevation standard deviation. The gradient has a strong correlation with elevation in the region around 400m. There is significant positive correlation between gradient and elevation in the region above 1430m.

Keywords


Elevation, Slope, Gradient, Geo-statistical analysis, Correlation, Henan province


DOI
10.12783/dtcse/amms2018/26238

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