Changing properties of hydrological extremes in south China: natural variations or human influences?

Qiang, Zhang; Jiang, Tao; Chen, Yongqin David; Chen, Xiaohong

doi:10.1002/hyp.7599

Cited by 48 publications

(22 citation statements)

References 22 publications

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“…Therefore, massive loss of economy and human lives can be expected, once a drought event occurs. Based on the analysis of probabilistic behavior of annual maximum water level series, Zhang et al (2010) indicated a lower risk of flood inundation of in lower Pearl River basin. However, it should be pointed out that the channel incision reduced the flood peak water level and the flooding risk in the incised reach; it has increased the concentration of flood flow in the channel and reduced the floodplain retention (Lu et al 2007).…”

Section: Discussionmentioning

confidence: 99%

Copula-based evaluations of drought variations in Guangdong, South China

et al. 2011

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Changing characteristics of hazardous weather-related events have been arousing considerable public interest in recent years. Guangdong is an economically developed province in China and is prone to natural hazards. Using monthly precipitation data covering a period of 1956-2008 from 127 rain gauge stations, the probabilistic behaviors of SPI-based droughts were investigated with copulas functions. Results indicated a higher risk of droughts along the coastal regions and the western Guangdong, particularly the Pearl River Delta (PRD) region. Joint probabilities of droughts with higher intensity and longer duration were found to have relatively even geographical distribution across Guangdong. The northern parts of Guangdong are higher in altitude and have a lower risk of droughts. Identification of regions characterized by droughts of different severity and durations across Guangdong is important for scientific management of water resource and agricultural activities and also the development of social resilience under the influence of climate changes.

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Section: Discussionmentioning

confidence: 99%

Copula-based evaluations of drought variations in Guangdong, South China

et al. 2011

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“…This research will contribute to the gap between our knowledge of drought impacts, vulnerability and those associated with other natural disasters in south China and other humid regions. Influences of droughts and floods on local human community should be reconsidered in that altered hydrological cycle has the potential to alter the precipitation changes in both space and time (Zhang et al 2009b(Zhang et al , 2010. Improving the human understanding of droughts is urgent and is also an essential step towards establishing enhancing human mitigation to drought disasters and establishment of sound adaptation approach to drought management (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, flash floods, mountainous floods and water logging, etc. are the main natural disasters of Guangdong (Zhang et al 2010), and some of them are the consequences of typhoon activities. Therefore, in this study, we will explore relations between droughts, floods and typhoon activities.…”

Section: Introductionmentioning

confidence: 99%

Flood, drought and typhoon disasters during the last half-century in the Guangdong province, China

Zhang

Chen

et al. 2010

Nat Hazards

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In this paper, we present the changing properties of losses due to occurrences of droughts, floods and typhoon disasters in the Guangdong province, a comparatively economically prosperous province in the south China. Influences of typhoon activities on droughts and floods are also analysed. Results based on extensive and thorough investigations indicate that (1) generally, Guangdong province is both humid and warm; however, in recent decades, the negative impacts of droughts seem to be enhancing, which is proved by increasing drought-induced economic loss. In this sense, considerable importance should be attached to droughts, but not solely to floods, in the Guangdong province; (2) low-lying terrain of the Guangdong province makes this region easy to be influenced by flood inundation. Moreover, highly urbanized areas are mostly located in the low-lying areas. Flood-induced loss was increasing before 1990s and is decreasing after 1990s, and this should be attributed mainly to seasonal shifts of precipitation changes and enhancing human mitigation to flood disasters; (3) typhoon activities often inflict considerable loss on the economy of the Guangdong province. Moreover, flood events in the study region are mostly the results of typhoon activities. Flash floods, strong wind and storm surge accompanying typhoon activities are the major factors intensifying the negative impacts of the typhoon disasters.

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“…A multitude of studies in the past 10 years have paid more attentions on the hydrological change in the Dongjiang River basin under the impact from human activities. It was demonstrated that the spatio-temporal distribution of streamflow in the river has been significantly altered due to land use/coverage change (LUCC) and the regulation of water reservoir (RWR) (Chen et al 2006Jin et al 2009;Zhang et al 2010;Liu et al 2010;Zhou et al 2012). But most of these studies focused on change in the quantities of hydrological elements rather than on the intra-annual structural characteristics of streamflow of the Dongjiang River, while the latter are also closely associated with both water demand and supply.…”

Section: Introductionmentioning

confidence: 99%

Intra-annual Distribution of Streamflow and Individual Impacts of Climate Change and Human Activities in the Dongijang River Basin, China

Singh

Chen

et al. 2015

Water Resour Manage

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Individual impacts of climate change, land use/coverage change, the regulation of water reservoir and water use to intra-annual distribution of streamflow of the Dongjiang River basin, South China, are quantitatively separated. Data on precipitation, streamflow, regulation of water reservoirs, and water use are used in the analysis. Changes in the concentration degree and non-uniformity coefficient of intra-annual distribution of streamflow over time scales from daily to monthly are evaluated. Water Resour ManageTrend and change point analyses are applied to determine characteristics of intra-annual distribution of streamflow. By comparison with the difference among region precipitation, naturalized streamflow and observed streamflow, the contribution of main impact factors to the intra-annual distribution of streamflow are quantified. Results demonstrate the non-uniformity coefficient decreases with a negative logarithmic linear function of the time scale. Change points of the concentration degree and non-uniformity coefficient occurred in 1973 exhibited a significant downward trend. In the period posterior to the change point the former and the latter decrease approximately by 15-34 % and by 29-40 %, respectively. The decrease in concentration degree and non-uniformity coefficient is due to the regulation of water reservoirs and land use/cover change; while the increase is the result of water use and climate change. The individual contributions to the impact on the intra-annual distribution of streamflow from regulation of water reservoirs, land use/cover change, water use, and climate change are approximately −33.5, −9.0, 4.5 and 1.0 %. It is observed that the impacts of the regulations of the Xinfengjiang, Fengshuba, and Baipenzhu reservoirs account for −21, −10, and −2 %, respectively. There is an increasing tendency in the impacts of land use/cover change and water use in the past 30 years.

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Changing properties of hydrological extremes in south China: natural variations or human influences?

Cited by 48 publications

References 22 publications

Copula-based evaluations of drought variations in Guangdong, South China

Copula-based evaluations of drought variations in Guangdong, South China

Flood, drought and typhoon disasters during the last half-century in the Guangdong province, China

Intra-annual Distribution of Streamflow and Individual Impacts of Climate Change and Human Activities in the Dongijang River Basin, China

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