jhydrol_48.pdf

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摘要：

Homogenization and similarities of precipitation and flow regimes across China are thoroughly
investigated using Gini coefficient analysis method and the Analysis Of Similarity (ANOSIM) technique, respectively based on daily precipitation data from 554 meteorological stations and monthly streamflow
data from 370 hydrological stations covering the period of 1960–2000. The results indicate that: (1)
Homogenization of precipitation regimes is increasing from the northwest to the southeast China.
However, different spatial patterns of homogenization of flow regions are identified. Spatially, lower
homogenization of flow regimes is detected in the northeast China and higher homogenization of flow
regimes in the central and southeast China. Temporally, flow regimes during 1961–2000 are characterized
mainly by increasing homogenization, and it is particularly true after 1980; (2) precipitation regimes
during 1961–2000 are characterized by decreasing dissimilarities. Larger areas of China are characterized
by decreasing dissimilarities of precipitation regimes during 1980–2000 when compared to those during
1961–1980, which should be due to increasing precipitation concentration and intensifying precipitation
regimes in recent years; (3) distinctly dissimilar precipitation and flow regimes can be identified between
geographically separate river basins. Interregional similarities of flow regimes are enhancing after 1980
when compared to those before 1980 though interregional similarities of precipitation regimes are not
changed much; and (4) spatial mismatch is evident in terms of spatial range and changing degree of flow
and precipitation regimes. Roughly spatial match can be observed between changes of flow and precipitation
indicates and it is particularly the case for precipitation and flow changes in dry season such as
winter in China. However, influences of human activities and precipitation changes on streamflow are
varying as for specific river basins, such as the Yangtze and the Yellow River basins. Damming-induced
fragmentation of river basins is the major cause behind higher homogenization of flow regimes. Thus,
human interferences in hydrological processes via damming and construction of reservoirs greatly alter
streamflow vs. precipitation relations. The results of this study provide theoretical and practical grounds
for management and planning of water resources at basin or interbasin scales under the influences of
human activities and climate changes.