Hydrologic alteration along the Middle and Upper East River (Dongjiang) basin, South China: a visually enhanced mining on the results of RVA method |
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Authors: | Yongqin David Chen Tao Yang Chong-Yu Xu Qiang Zhang Xi Chen Zhen-Chun Hao |
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Institution: | (1) Department of Geography and Resource Management and Institute of Space and Earth Information Science, The Chinese University of Hong Kong, Shatin, Hong Kong, China;(2) State Key Laboratory of Hydrology-Water Resources and Hydraulics Engineering, Hohai University, 210098 Nanjing, People’s Republic of China;(3) The Institute of Hydraulic Engineering of Yellow River, 450003 Zhengzhou, China;(4) Department of Geosciences, University of Oslo, Oslo, Norway; |
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Abstract: | This paper presents a visually enhanced evaluation of the spatio-temporal patterns of the dam-induced hydrologic alteration
in the middle and upper East River, south China over 1952–2002, using the range of variability approach (RVA) and visualization
package XmdvTool. The impacts of climate variability on hydrological processes have been removed for wet and dry periods,
respectively, so that we focus on the impacts of human activities (i.e., dam construction). The results indicate that: (1)
along the East River, dams have greatly altered the natural flow regime, range condition and spatial variability; (2) six
most remarkable indicators of hydrologic alteration induced by dam-construction are rise rate (1.16), 3-day maximum (0.91),
low pulse duration (0.88), January (0.80), July (0.80) and February (0.79) mean flow of the East River during 1952–2002; and
(3) spatiotemporal hydrologic alterations are different among three stations along Easter River. Under the influence of dam
construction in the upstream, the degree of hydrologic changes from Lingxia, Heyuan to Longchuan station increases. This study
reveals that visualization techniques for high-dimensional hydrological datasets together with RVA are beneficial for detecting
spatio-temporal hydrologic changes. |
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Keywords: | |
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