Journal of Geo-information Science >
Extraction and Distribution of Mountain Base Elevation in the Qinling-Daba Mountains
Received date: 2018-05-07
Request revised date: 2018-07-21
Online published: 2018-10-17
Supported by
National Natural Science Foundation of China, No.41601091
Integrated Scientific Investigation of the North-South Transitional Zone of China.
Copyright
As the North-South boundary of China and the watershed between Yellow River and Yangtze River, the Qinling-Daba Mountains are characterized with complicated and transitional variations in mountain altitudinal belts. For a longtime, latitude, longitude and mountain mass effect (MEE) have been considered to affect the vertical distribution of montane vegetation or altitudinal belts. The two former factors reflect the zonality of the geological distribution of vegetation and have receiving much attention, but MEE, an important factor for montane vegetation variation, is often overlooked because of the lack of effective quantitative methods for it in the Qinling-Daba Mountains. Quantification of MEE contributes to understanding azonal factors and the transitional characteristics between warm-temperate and north subtropical zone in China. Mountain base elevation (MBE), as a topographic factor, related to MEE closely, and recognition and quantification of it is indispensable for quantifying MEE. This study aims at quantifying MBE based on STRM-1 data with 30m resolution in the Qinling-Daba Mountains. We used two methods (based on mountain characteristics and based on drainage basin division) to determine mountain base subareas and then used relief amplitude, the average altitude in each subareas and slope to calculate the MBE. The results show that: (1) There are 93 subareas based on mountain characteristics method and 209 subareas based on drainage basin division method in the Qinling-Daba Mountains. The two MBEs have similar values and distributions and reflect the characteristics of the terrain of the study areas. (2) From east to west, MBE presents a gradual upward trend. (3) Along latitudinal direction, MBE presents a tendency of increasing from the Hanjiang Valley to the Qinling ridge and the Daba ridge. (4) The MBEs vary greatly in different exposures, from 1000m to 1809m in the southern flank of the Qinling, but only 850~1300 m in the northern flank. The MBE extracting methods will provide important technical support for the quantitative research of MEE in the Qinling-Daba Mountains.
LIU Junjie , QIN Fen , ZHAO Fang , CAO Yanping . Extraction and Distribution of Mountain Base Elevation in the Qinling-Daba Mountains[J]. Journal of Geo-information Science, 2018 , 20(10) : 1457 -1466 . DOI: 10.12082/dqxxkx.2018.180227
Fig. 1 The distribution of the Qinling-Daba Mountains图1 秦岭大巴山区域图 |
Fig. 2 The process of extraction of mountain base subarea in the Qinling-Daba Mountains图2 山体基面高度分区方法 |
Fig. 3 The process of extraction of main ridge-line in the Qinling-Daba Mountains图3 主山脊线提取方法 |
Fig. 4 The relationships between confluence threshold and the quantities of sub-basin and river density in the Qinling-Daba Mountains图4 秦巴山地子流域数量和河流密度随汇流累积量阈值变化 |
Fig. 5 The extraction of mountain characteristic lines in the Qinling-Daba Mountains图5 山体特征线提取结果 |
Fig. 6 The quantification results of mountain base elevation based on mountain characteristics and drainage basin division in the Qinling-Daba Mountains图6 基于山体特征线与流域分区的山体基面高度提取结果 |
Fig. 7 The process of extraction of mountain base elevation in the Qinling-Daba Mountains图7 山体基面高度提取方法 |
Fig. 8 The distribution of mountain base elevation based on mountain characteristics and drainage basin division from west to east in the Qinling-Daba Mountains图8 基于山体特征线和基于流域分区的山体基面高度(西-东)变化情况 |
Fig. 9 The distribution of mountain base elevation based on mountain characteristics and drainage basin division from south to north in the Qinling-Daba Mountains图9 基于山体特征线和基于流域分区的山体基面高度(南-北)变化情况 |
The authors have declared that no competing interests exist.
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