Spatiotemporal shifts in key hydrological variables and dominant factors over China,Hydrological Processes

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Spatiotemporal shifts in key hydrological variables and dominant factors over China
Hydrological Processes ( IF 3.2 ) Pub Date : 2021-07-22 , DOI: 10.1002/hyp.14319
Shanlei Sun ₁ , Zaoying Bi ₁ , Shujia Zhou ₂ , Hongzhou Wang ₁ , Qingqing Li ₁ , Yi Liu ₃ , Guojie Wang ₃ , Shijie Li ₃ , Haishan Chen ₁ , Yang Zhou ₁

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Quantitatively and physically understanding changes in land surface hydrology is a hot topic in the hydro-meteorological research, especially over China with high population density but uneven distribution of water resources. Therefore, the spatiotemporal dynamics (i.e., the 1980s [1981–1990] and 1990s [1991–2000] relative to the baseline of 1961–1980) in evapotranspiration (ET) and streamflow/runoff (Q) were examined across 426 hydrological divisions (HDs) of China. Both the 1980s and 1990s ET decreased over roughly 50% HDs mainly in the central and southeast parts of China, while the 1980s (1990s) Q decreased over slightly higher than 50% (63%) HDs generally in north and southwest China (the central and north parts of China). Relative to the 1980s, more HDs had strong changes in ET and Q in 1990s. Based on the separated contributions of precipitation (P), reference ET and Budyko-type equation parameter n (an integrated variable of catchment property) to ET and Q changes, we found that in 1980s and 1990s, n dominated ET changes over about 60% HDs mainly in the south, with the dominant of P around 35% HDs generally in the north and northeast, while for Q changes, nearly 60% (slightly less than 40%) HDs were dominated by n (P). Moreover, the dominants for ET (Q) changes have shifted from 1980s to 1990s over 36% (45%) HDs, mainly changing from P to n. This study provides a framework for quantitatively understanding land surface hydrological dynamics from the perspectives of climatic and physiographic controls over regions.

更新日期：2021-08-10

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