Spatial patterns and temporal variability of dryness/wetness in the Yangtze River Basin, China

Zhao, Guangju; Mu, Xingmin; Hörmann, Georg; Fohrer, Nicola; Xiong, Ming; Su, Buda; Li, Xiucang

doi:10.1016/j.quaint.2011.10.020

Cited by 65 publications

(50 citation statements)

References 24 publications

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“…At interseasonal scale, the short rainy periods mainly occur during three months of summer (June to August), and at least half or more than 60% of the rainfall happens in this period. Strong seasonality in rainfall usually produces severe floods in streams (Zhang et al, 2007;Zhao et al, 2012). In addition, precipitation in the monsoon area also exhibited large variability at interannual and interdecadal time scales.…”

Section: Determinants Of Fish Assemblagesmentioning

confidence: 99%

“…Its rainfall seasonality follows a typical monsoon pattern, receiving around 60% or more of the annual total during the summer (May to August). Most precipitation falls during a few heavy precipitation events and results in severe flooding, whereas little rainfall is received during the winter (October to March) and often leads to drought (Zhai et al, 2005;Zhao et al, 2012). Therefore, the monsoon climate, especially seasonal precipitation, determines the hydrology and ecological process of the streams and rivers in this region, and produces distinct changes in flow regimes and physical habitats over an annual cycle.…”

Section: Introductionmentioning

confidence: 99%

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Hydrologic connectivity driven natural stream fish assemblages in mountain streams in the Yangtze River basin: implications for stream fish conservation in monsoonal East Asia

Kang

Tao

et al. 2016

Hydrobiologia

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The East Asian monsoon and related seasonal rain belts are assumed to be significantly variable at intraseasonal, interannual, and interdecadal time scales, and largely determine the hydrology and ecological processes of the streams and rivers in this region. This study investigated the spatiotemporal variation in fish assemblages and the relative importance of local habitat and regional landscape variables in two protected streams in the middle Yangtze River basin. We hypothesized that the stream fish assemblages in this area are strongly influenced by the monsoon climate, and display a spatiotemporal variation in response to changes of stream flow regimes and physical habitats. The results show that species richness and abundance varied with both season and stream size. The distance to the downstream confluence site was the top important environmental factor, followed by altitude and downstream link. The results suggest that the fish assemblages within this protected watershed are mainly affected by regional landscape variables such as longitudinal position and stream position, but less by local habitat variables including water temperature and habitat types. The study highlights the importance of tributary connectivity and continuity to stream fish diversity in this area, indicating that restoration activities should preferentially recover the connectivity between upstream and downstream.Handling editor: M. Power

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Section: Determinants Of Fish Assemblagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrologic connectivity driven natural stream fish assemblages in mountain streams in the Yangtze River basin: implications for stream fish conservation in monsoonal East Asia

Kang

Tao

et al. 2016

Hydrobiologia

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“…Comprehensive descriptions on the SPI and its application in China are available, e.g. from Bordi et al (2004a), Zhang et al (2009), Zhai et al (2010a, and Zhao et al (2012). The SPI is calculated for the weighted area-averaged monthly precipitation data and computed by fitting the two-parameter gamma distribution to the frequency distribution of the precipitation summed to a 24-month timescale .…”

Section: Standardized Precipitation and Discharge Indices (Spi And Sdi)mentioning

confidence: 99%

“…Bordi et al (2003Bordi et al ( , 2004aBordi et al ( , b, 2007 and Zhao et al (2012) describe the use and background of the PCA in detail. In this study, we calculate the PCA with the statistical software R and use the PCA for identifying the spatial co-variability of the SPI-24 in the six sub-basins of the Xijiang River.…”

Section: Principal Component Analysismentioning

confidence: 99%

Hydrological long-term dry and wet periods in the Xijiang River basin, South China

Fischer

Gemmer

et al. 2013

Hydrol. Earth Syst. Sci.

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Abstract. In this study, hydrological long-term dry and wet periods are analyzed for the Xijiang River basin in South China. Daily precipitation data of 118 stations and data on daily discharge at Gaoyao hydrological station at the mouth of the Xijiang River for the period 1961-2007 are used. At a 24-month timescale, the standardized precipitation index (SPI-24) for the six sub-basins of the Xijiang River and the standardized discharge index (SDI-24) for Gaoyao station are applied. The monthly values of the SPI-24 averaged for the Xijiang River basin correlate highly with the monthly values of the SDI-24. Distinct long-term dry and wet sequences can be detected.The principal component analysis is applied and shows spatial disparities in dry and wet periods for the six subbasins. The correlation between the SPI-24 of the six subbasins and the first principal component score shows that 67 % of the variability within the sub-basins can be explained by dry and wet periods in the east of the Xijiang River basin. The spatial dipole conditions (second and third principal component) explain spatiotemporal disparities in the variability of dry and wet periods. All sub-basins contribute to hydrological dry periods, while mainly the northeastern sub-basins cause wet periods in the Xijiang River. We can also conclude that long-term dry events are larger in spatial extent and cover all sub-basins while long-term wet events are regional phenomena.A spectral analysis is applied for the SPI-24 and the SDI-24. The results show significant peaks in periodicities of 11-14.7 yr, 2.8 yr, 3.4-3.7 yr, and 6.3-7.3 yr. The same periodic cycles can be found in the SPI-24 of the six sub-basins but with some variability in the mean magnitude. A wavelet analysis shows that significant periodicities have been stable over time since the 1980s. Extrapolations of the reconstructed SPI-24 and SDI-24 represent the continuation of observed significant periodicities at given magnitudes until 2030. The projected hydrological long-term dry and wet periods can be used for planning purposes in water resources management. The applied methodologies prove to be able to identify spatial disparities, and to detect significant periodicities in hydrological long-term dry and wet periods in the Xijiang River basin.

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“…temporal and spatial variabilities in dry and/or wet conditions (Gocic and Trajkovic, 2014;Li et al, 2013;Zhao et al, 2012). …”

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confidence: 99%

Analysis of the spatio-temporal patterns of dry and wet conditions in the Huai River Basin using the standardized precipitation index

Yang

2015

Atmospheric Research

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Located in a transition zone between the northern and southern climates in China, the Huai River Basin is prone to extreme events such as drought and flood. Based on the daily precipitation data at 134 stations between 1961 and 2013, this paper analyzed the spatial and temporal patterns of the dry and wet conditions in the Huai River Basin through the statistical analysis of the rainfall stations' annual and seasonal standard precipitation index (SPI) series. Annual SPI series exhibited a decreasing trend at 86 stations and an increasing trend at the remaining stations. None of the increasing trend was significant, while the decreasing trend was significant at two stations at 5% significance level (=0.05) and one station at 10% level. Seasonal-wise, there has been a prevailing trend of drying in spring and autumn, and wetting in summer and winter.The trends in the spring and summer SPI series have been mostly insignificant, while those in autumn and winter significant (=0.10) at over 30 stations. The Pettitt test results indicated that the significant transitions (=0.10) in the autumn and winter SPI series mostly occurred in the middle to late 1980's. Comparison of the average number of dry and wet years between the two sub-periods of 1961-1984 and 1990-2013 suggested a significant increase (=0.05) in the average number of severely wet years across much of the basin. Overall, significant changes have already occurred in the dry and wet conditions of the Huai River Basin, which could have profound impacts on the food and water safety situation of the region.

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Spatial patterns and temporal variability of dryness/wetness in the Yangtze River Basin, China

Cited by 65 publications

References 24 publications

Hydrologic connectivity driven natural stream fish assemblages in mountain streams in the Yangtze River basin: implications for stream fish conservation in monsoonal East Asia

Hydrologic connectivity driven natural stream fish assemblages in mountain streams in the Yangtze River basin: implications for stream fish conservation in monsoonal East Asia

Hydrological long-term dry and wet periods in the Xijiang River basin, South China

Analysis of the spatio-temporal patterns of dry and wet conditions in the Huai River Basin using the standardized precipitation index

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