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Related Experiment Video

Updated: Jun 11, 2026

Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

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Published on: July 24, 2016

A bivariate copula-wavelet analysis approach for quantifying compound runoff-sediment risks under cascade reservoirs.

Ronglan Li1, Chunhui Li1, Xiong Zhou1

  • 1State Key Laboratory for Water and Sediment Sciences of Ministry of Education, School of Environment, Beijing Normal University, Beijing 100875, China.

Water Research
|June 9, 2026
PubMed
Summary

Cascade reservoirs alter river flow and sediment dynamics, shifting risks from simultaneous to sequential events. This study introduces a new method to analyze these compound hydrological hazards in river basins.

Keywords:
Compound hydrological riskCopula functionJoint return periodRunoff-sediment interactionsWavelet analysis

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Area of Science:

  • Hydrology
  • River Basin Management
  • Water Resource Engineering

Background:

  • Managing river basins with cascade reservoirs requires understanding complex runoff and sediment dynamics.
  • Cascade reservoirs significantly alter natural hydrological processes, necessitating advanced risk assessment tools.

Purpose of the Study:

  • To develop and apply a bivariate copula-wavelet risk analysis (BCWRA) approach for assessing synchronous and asynchronous runoff-sediment risks.
  • To quantify the impact of cascade reservoir operations on runoff-sediment dynamics in the Upper Yellow River Basin (UYRB).

Main Methods:

  • Trend detection and periodicity analysis of hydrological data.
  • Copula-based joint probability modeling and joint return period estimation.
  • Application of the BCWRA approach to four hydrological stations in the UYRB.

Main Results:

  • Reservoir operations reduced synchronous runoff-sediment events by 17.74% and increased asynchronous events by 18.25%.
  • Midstream stations showed heightened risks of sediment retention and channel erosion.
  • Reservoir regulation decreased runoff variability and sediment transport, shortening return periods for extreme events.

Conclusions:

  • The BCWRA approach effectively assesses compound runoff-sediment risks in regulated river basins.
  • Adaptive management strategies are proposed to mitigate risks associated with altered hydrological dynamics.
  • The study provides a generalizable framework for managing compound hydrological hazards in regulated rivers.