Abstract
Global extreme hydrological events pose considerable challenges to the sustainable development of human society and river ecology. Land use/cover change (LUCC) is a visible manifestation of human activity and has caused substantial alterations in extreme hydrological regimes across rivers worldwide. The Jinsha River lies upstream of the Yangtze River and its hydrological variability has had profound socioeconomic and environmental effects. In this study, we developed Hydrological Simulation Program-FORTRAN (HSPF) and land-use simulation models of the entire watershed to simulate the effects of LUCC on hydrological extremes and quantify the inter-relationships among them. The main land-use changes between 1995 and 2015 were those associated with cropland, forest land, and grassland. Between 2015 and 2030, it is estimated that the coverage of forest land, grassland, construction land, and unused land will increase by 0.64%, 0.18%, 69.38%, and 45.08%, respectively, whereas that of cropland, water bodies, and snow- and ice-covered areas will decline by 8.02%, 2.63%, and 0.89%, respectively. LUCC has had irregular effects on different hydrological regimes and has most severely altered stream flows. The responses of hydrological extremes to historical land-use change were characterized by spatial variation. Extreme low flows increased by 0.54%–0.59% whereas extreme high flows increased by 0%–0.08% at the lowest outlet. Responses to future land-use change will be amplified by a 0.72%–0.90% reduction in extreme low flows and a 0.08%–0.12% increase in extreme high flows. The hedging effect caused by irregular changes in tributary stream flow was found to alleviate the observed flow in mainstream rivers caused by land-use change. The extreme hydrological regimes were affected mainly by the net swap area transferred from ice and snow area to forest (NSAIF) and thereafter to cultivated land (NSAIC). Extreme low flows were found to be positively correlated with NSAIF and NSAIC, whereas extreme high flows were positively correlated with NSAIC and negatively correlated with NSAIF.
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Foundation: National Key Research and Development Program of China, No.2021YFC3201004
Author: Gao Wei (1986–), PhD and Associate Professor, specialized in the simulation of watershed environmental processes.
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Gao, W., Liu, Y., Du, Z. et al. Hedging effect alleviates the impact of land use on mainstream hydrological regimes: Evidence from Jinsha River, China. J. Geogr. Sci. 33, 2011–2030 (2023). https://doi.org/10.1007/s11442-023-2163-1
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DOI: https://doi.org/10.1007/s11442-023-2163-1