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Spatio-temporal changes of hydrological processes and underlying driving forces in Guizhou region, Southwest China
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
2009 (English)In: Stochastic environmental research and risk assessment (Print), ISSN 1436-3240, E-ISSN 1436-3259, Vol. 23, no 8, 1071-1087 p.Article in journal (Refereed) Published
Abstract [en]

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 a parts per thousand yen95%) 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.

Place, publisher, year, edition, pages
2009. Vol. 23, no 8, 1071-1087 p.
National Category
Meteorology and Atmospheric Sciences
URN: urn:nbn:se:uu:diva-120788DOI: 10.1007/s00477-008-0278-7OAI: oai:DiVA.org:uu-120788DiVA: diva2:304317
Chong-Yu Xu har adress Department of Geosciences, University of Oslo på artikelnAvailable from: 2010-03-17 Created: 2010-03-16 Last updated: 2010-07-07Bibliographically approved

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