Yaping WANG, Beijing Normal University, China
Shuai WANG, Beijing Normal University, China
Connection between meteorological and hydrological droughts (CMHD) has changed due to increasing human modifications. Understanding such change from anthropogenic perspective is therefore of critical importance for drought monitoring, early warning, and adapting. Taking the Yellow River basin (YRB) as an example, a wide range of human activities, such as irrigation, reservoirs, soil and water conservation measures, and the Grain for Green program, occur almost everywhere, but effects of these activities on CMHD are still unclear. In this study, we analyzed CMHD in the YRB with a multifaceted way covering trend, correlation, difference, and propagation, highlighted the spatial heterogeneity between sub-regions of the YRB in CMHD, and proved this heterogeneity was closely associated with human activities by quantifying effects of human activities on CMHD in each sub-region. Specially, we found that 1) human activities sharpened downward trend in SSI and aggravated disconnection between SPEI and SSI by weakening their correlation and amplifying their difference, and 2) effects of human activities on CMHD were characterized by reducing drought propagation, declining HD number, lengthening HD duration, and decreasing HD frequency. Although we summarized these effects in common, some changes in drought intensity and propagation time differed in sub-regions due to their distinctive features. In short, this study contributes to better understanding of human effects on CMHD in a complicated human-modified world and this is vital to water management.
Mots clés : Meteorological drought|Hydrological drought|Connection|Drought event|Drought propagation
A104908YW