Spatio-temporal changes of hydrological processes and underlying driving forces in Guizhou region, Southwest China |
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| Authors: | Tao Yang Xi Chen Chong-Yu Xu Zhi-Cai Zhang |
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| Institution: | (1) State Key Laboratory of Hydrology, Water Resources and Hydraulics Engineering, Hohai University, 210098 Nanjing, People’s Republic of China;(2) Department of Geosciences, University of Oslo, Oslo, Norway;(3) Yellow River Institute of Hydraulic Research, 450003 Zhengzhou, China |
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| Abstract: | Understanding the changes in streamflow and associated driving forces is crucial for formulating a sustainable regional water
resources management strategy in the environmentally fragile karst area of the southwest China. This study investigates the
spatio-temporal changes in streamflow of the Guizhou region and their linkage with meteorological influences using the Mann–Kendall
trend analysis, singular-spectrum analysis (SSA), Lepage test, and flow duration curves (FDCs). The results demonstrate that:
(1) the streamflow in the flood-season (June–August) during 1956–2000 increased significantly (confidence level ≥95%) in most
catchments, closely consistent with the distinct increasing trend of annual rainfall over wet-seasons. The timings of abrupt
change for streamflow in most catchments are found to occur at 1986; (2) streamflow in the Guizhou region experiences significant
seasonal changes prior/posterior to 1986, and in most catchments the coefficient of variation of monthly streamflow increases;
(3) spatial changes in streamflow indicate that monthly streamflow in the north-west decreases but increases in other parts;
(4) the spatial high- and low-flow map (Q
5 and Q
95) reveals an increase in the extremely large streamflow in the five eastern catchments but a decrease in the extremely low
streamflow in the four eastern catchments and three western catchments during 1987–2000. An increase in streamflow, particularly
extreme flows, during the flood season would increase the risk of extreme flood events, while a decrease in streamflow in
the dry season is not beneficial to vegetation restoration in this ecologically fragile region. |
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