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Quantifying the change in streamflow complexity in the Yangtze River.

Yuankun Wang1, Yuwei Tao1, Dong Sheng2

  • 1Key Laboratory of Surficial Geochemistry, Ministry of Education, Department of Hydrosciences, School of Earth Sciences and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing, 210023, China.

Environmental Research
|November 16, 2019
PubMed
Summary
This summary is machine-generated.

Streamflow complexity in the Yangtze River generally increases downstream, influenced by factors like dam construction. This study used sample entropy to analyze 60 years of data, revealing trends and impacts on river dynamics.

Keywords:
ComplexitySample entropyStreamflow seriesYangtze river

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Area of Science:

  • Hydrology
  • Environmental Science
  • Complexity Science

Background:

  • Hydrological processes in the Yangtze River are increasingly impacted by environmental change and human activities.
  • Understanding streamflow dynamics is crucial for water resource management and ecological health.
  • Entropy analysis offers a novel approach to quantify streamflow complexity.

Purpose of the Study:

  • To investigate the spatial distribution and temporal changes in streamflow series complexity in the Yangtze River.
  • To quantify streamflow complexity using sample entropy analysis.
  • To assess the influence of factors like dam construction on streamflow complexity.

Main Methods:

  • Utilized sample entropy to quantify streamflow complexity.
  • Analyzed daily streamflow data from six stations (four mainstem, two lake) over 60 years.
  • Examined spatial variations and temporal trends in streamflow complexity.

Main Results:

  • Streamflow complexity exhibits spatial differences, generally increasing from upstream to downstream.
  • A negative correlation exists between annual streamflow and sample entropy.
  • Complexity increased at Cuntan, Yichang, and Datong stations, decreased at Hankou, and showed minimal change in lakes.
  • The Three Gorges Dam impacted complexity during initial impoundment but had slight effects during full operation.

Conclusions:

  • Dam construction significantly influences streamflow complexity in the Yangtze River mainstem.
  • Streamflow complexity dynamics vary spatially and are sensitive to anthropogenic interventions.
  • Findings provide a scientific basis for understanding flow evolution and informing water management strategies.