Influence of area and space dependence for hypsometric integral and its geological implications
Received date: 2008-12-03
Revised date: 2009-07-20
Online published: 2010-02-20
The hypsometric integral (HI) of a drainage basin is a morphometric parameter for describing basin geomorphology. Lately the HI has become an index to infer activities of active tectonics in some orogenic belts. Some scholars take the hypsometric integral as an index to deduce the regional active tectonism.This paper examines two issues related to the HI:area dependence and space dependence. Our study calculates and analyzes the 10 rivers' hypsometric integrals of the Northern Tianshan Mountains, and the relations of the HI influencing factors. The result shows that there are x-logarithmic negative correlations not only between the average HI and the average area, but also between the average HI and the average drop, sorted by the different threshold accumulations of the drainage sub-basins in the Northern Tianshan Mountains. Moreover, there are higher HIs on moutain-type subbasins at upper stream and lower HIs on hill-type subbasins at piedmont.The three east-west trending thrust-fold belts along the southern flank of the Jungar basin divide the study area based on HIs into several regions with the same tendency of the three thrust-fold belts. It opens out the spatial dependence of the HI. The abnormal districts of the HI in the smaller drainage basin, present the remarkable influence of the rocky ingredient and the lithologic difference. In Manas river basin, by overlaying lithologic and tectonic maps on different drainage areas of subbasin groups, we found that the HIs of subbasins showed the effect of lithology and tectonics using a threshold less than 9km2. However, the HIs showed almost entirely the effect of tectonic elements using a threshold more than 20km2.
ZHAO Hong-zhuang, LI You-li, YANG Jing-chun, LU Hong-hua . Influence of area and space dependence for hypsometric integral and its geological implications[J]. GEOGRAPHICAL RESEARCH, 2010 , 29(2) : 271 -282 . DOI: 10.11821/yj2010020010
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