[1]QIU Dexun,MU Xingmin,ZHAO Guangju,et al.Effects of Precipitation Extremes Change on Streamflow and Sediment Load in Weihe River Basin[J].Research of Soil and Water Conservation,2022,29(06):65-72.
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Effects of Precipitation Extremes Change on Streamflow and Sediment Load in Weihe River Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 06
Page number:
65-72
Column:
Public date:
2022-10-20
- Title:
- Effects of Precipitation Extremes Change on Streamflow and Sediment Load in Weihe River Basin
- CLC:
- P333.1
- DOI:
- -
- Abstract:
- In order to explore the trend of extreme rainfall and its impact on water and sediment regime in the Weihe River Basin, we used nonparametric trend analysis, abrupt change analysis and continuous wavelet transform to diagnose the variation characteristics of extreme rainfall index, runoff and sediment transport in the Weihe River Basin from 1960 to 2019. Moreover, we quantitatively evaluated the impact of extreme rainfall on water and sediment variation in the Weihe River Basin through double cumulative curve method and correlation analysis method. The results show that: The extreme rainfall indices fluctuate over time; On the whole, PRCPTOT, RX5day, and RX1day show downward trend(p>0.05), while R95pTOT, SDII and FSPTOT show upward trend(p>0.05). In addition, each extreme rainfall index has the periodic variation characteristics of 4～6 years, 11～12 years, and 28～29 years. The annual streamflow and annual sediment load show a significant decreasing trend, with abrupt changes in 1993 and 1999, respectively. The streamflow has periods of 5 years and 12 years. On the time scale of 12 years, the changes of streamflow and extreme rainfall indices are basically synchronous. Each index is positively correlated with streamflow and sediment load. By contrast, the correlation between sediment load and extreme rainfall index is low. Extreme rainfall changes have an important impact on the reduction of runoff and sediment load. PRCPTOT has the greatest impact on streamflow reduction(29.65%), followed by RX5day(25.68%)and FSPTOT(25.95%). Similarly, PRCPTOT also has the greatest impact on the reduction of sediment load(10.02%), followed by RX5day(7.12%). In a word, the change of water and sediment regime in the Weihe River Basin is significantly affected by extreme rainfall.
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Last Update:
2022-10-20