Temporal and Spatial Characteristics of Dry-Wet Conditions from 1960 to 2006 in Qilian Mountains and Hexi Corridor
JIA Wen-xiong
HE Yuan-qing
LI Zong-xing
WANG Xu-feng
Abstract：. Based on the climatic data of 20 weather stations from 1960 to 2006, the monthly potential evaporation was calculated using the Penman-Monteith model, and then the monthly humid index was reconstructed in Qilian Mountains and Hexi Corridor. In order to study the temporal and spatial characteristics of the dry-wet conditions in the study area, the seasonal and annual humid indices were analyzed. Statistical results indicate that the study area was drier before 1980s, and the humid index has been on the rise since 1960s. The change rate of annual humid index was 0.0014 a~(-1), which indicates that the humid condition of study area has become better obviously, especially in spring and winter. The spatial change of dry-wet conditions of the study area shows that it is becoming wetter from eastern to western parts in east region with an exception of the eastern area of Wushaoling Mountains which is becoming drier; for most middle region, it is also becoming drier insignificantly except for the northern area of Shule South Mountains and Zhangye oasis, and, it is becoming wetter in most western region except for the western area of Dunhuang City where it is becoming wetter insignificantly.
Keywords：humid indexinterdecadal variationinterannual variationQilian MountainsHexi Corridorhydrogeology.
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 268-276 )