A Practical Approach for Environmental Flow Calculation to Support Ecosystem Management in Wujiang River, China

Int J Environ Res Public Health. 2022 Sep 15;19(18):11615. doi: 10.3390/ijerph191811615.


To promote ecosystem protection in the Wujiang River, this paper proposes a practical approach for calculating the environmental flow. The proposed approach combines the idea of the "guarantee rate" of the flow duration curve (FDC) method and the grading idea of the Tennant method. A daily flow series of the Wujiang River was compiled from 1956 to 2019 and used to compare the effect of the proposed approach versus the traditional approaches in four selected sections along the river. The results show that the environmental flow of the Wujiang River can be divided into five levels by the T-FDC method, with a level-by-level disparity, and all levels can capture the temporal and spatial variability of river flow. Additionally, the calculated basic environmental flow process ranges between the historical minimum and second minimum monthly average flow, and the threshold width of the optimal flow is more reasonable than the Tennant method. The T-FDC method can provide technical support for Wujiang River ecosystem management and sustainable development.

Keywords: Wujiang River Basin; environmental flow; flow duration curve; hierarchical target; tennant method.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • China
  • Ecosystem*
  • Environmental Monitoring / methods
  • Rivers*

Grants and funding

This research was funded by the National Key Research & Development Project of China, grant number 2016YFC0402209, and the China Scholarship Council.