Study on the Driven Mechanism of Watershed Hydrological Drought Based on
Geomorphological Spatial Distribution Pattern: A Case Study of Guizhou,
China
Abstract
In recent years, hydrological drought has become more and more frequent,
which has caused serious ecological and environmental problems. This
paper is taking Guizhou province of China as an example to analyze the
geomorphologic distribution and temporal-spatial evolution of
hydrological droughts, and to study driving mechanisms of both the
rainfall in drought periods and geomorphologic factors on the
hydrological droughts, based on the hydrometeorological data from the
2000 to 2010, and the TM and DEM data. The results show that (1) the
rainfall and its temporal-spatial distribution have less impacts on the
hydrological droughts and its temporal-spatial distribution, showing the
obvious phase characteristics, and the regional hydrological droughts
are more serious in the south than in the north, and the less serious in
the east than in the west; and (3) in terms of the overall distribution
of landform types, the mountain, hill and basin have less impacts on
hydrological droughts; in terms of the distribution of single geomorphic
type, hydrological droughts are significantly influenced by the
high-medium mountain, deep-high hill and high basin, where the
hydrological droughts are relatively lighter. While there are more
serious areas in the low basin, shallow-low hill and low mountain.