【摘要】：針對(duì)高差對(duì)于地貌類(lèi)型定義、不同地貌類(lèi)型范圍劃定以及山地災(zāi)害危險(xiǎn)性評(píng)價(jià)的重要意義,該文將坡腳的高程定義為基準(zhǔn)高程,提出了動(dòng)態(tài)窗口鄰域統(tǒng)計(jì)的高差計(jì)算方法。計(jì)算每個(gè)柵格到坡腳的距離,作為該柵格的對(duì)應(yīng)的窗口半徑;利用鄰域統(tǒng)計(jì)的方法,搜索該窗口范圍內(nèi)的最低高程值,即為坡腳的高程,作為該柵格高差計(jì)算的基準(zhǔn)高程;最終通過(guò)高程值與基準(zhǔn)高程相減運(yùn)算,獲取每個(gè)柵格點(diǎn)對(duì)應(yīng)的高差。選取四川省都江堰市虹口地區(qū)為研究區(qū),對(duì)比兩種不同的高差計(jì)算方法。結(jié)果顯示:在山脊和山肩部位,動(dòng)態(tài)窗口計(jì)算的高差值大于靜態(tài)窗口的高差值,而位于山腳動(dòng)態(tài)窗口計(jì)算的高差值小于靜態(tài)窗口計(jì)算的高差值;利用動(dòng)態(tài)窗口獲得的高差的精度明顯高于靜態(tài)窗口的計(jì)算結(jié)果,其平均偏差由75.53降低為13.24。
[Abstract]:In view of the significance of height difference for the definition of geomorphological types, the delineation of different geomorphological types and the risk assessment of mountain disasters, this paper defines the elevation at the foot of the slope as the reference elevation, and puts forward a method for calculating the height difference of dynamic window neighborhood statistics. The distance from each grid to the foot of the slope is calculated as the corresponding window radius of the grid, and the lowest elevation value in the window range is searched by the method of neighborhood statistics, that is, the elevation of the foot of the slope, which is used as the reference elevation calculated by the height difference of the grid. Finally, the height difference corresponding to each grid point is obtained by subtraction between elevation value and reference elevation. Hongkou area of Dujiangyan City, Sichuan Province is selected as the study area, and two different calculation methods of height difference are compared. The results show that the height difference calculated by the dynamic window is larger than that calculated by the static window in the ridge and shoulder, while the height difference calculated by the dynamic window at the foot of the mountain is smaller than that calculated by the static window. The accuracy of the height difference obtained by dynamic window is obviously higher than that of static window, and the average deviation is reduced from 75.53 to 13.24.
【作者單位】： 中國(guó)科學(xué)院山地災(zāi)害與地表過(guò)程重點(diǎn)實(shí)驗(yàn)室/水利部成都山地災(zāi)害與環(huán)境研究所;西南科技大學(xué)環(huán)境與資源學(xué)院;
【分類(lèi)號(hào)】：P208

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