Evaluation of instream ecological flows based on hydrological alteration in the Upper Huai River, China

Author:

Liu Simin1,Yan Dengming23ORCID,Lv Hong23,Lin Jin1,Yu Zhilei4,Cao Lucong1

Affiliation:

1. a Development Research Center, National Forestry and Grassland Administration, Beijing 100714, China

2. b Yellow River Engineering Consulting Co., Ltd, Zhengzhou 450003, China

3. c Key Laboratory of Water Management and Water Security for Yellow River Basin, Ministry of Water Resources (Under Construction), Zhengzhou 450003, China

4. d School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China

Abstract

Abstract Natural flow regime (instream ecological flow) is a vital element of ecological hydrology, serving a crucial role in the fundamental functions of river ecosystems. Intense human activities, especially reservoir operation, have unavoidably altered the flow regime of the Upper Huai River, leading to further impacts on river ecosystems. It is essential to quantify hydrological alterations in flow regimes and their associated impacts on river ecosystems for effective river water management. Ecological flow indicators, namely ecological deficit and surplus, were analyzed to assess instream ecological flow. The overall degree of alteration (Do) and the Dundee Hydrological Regime Alteration Method (DHRAM) were utilized to evaluate the degree of hydrological alteration. Additionally, the Shannon Index (SI) was employed to estimate the impact of hydrological alterations on ecological diversity in this study. The results reveal that the streamflow series underwent mutation in 1987, leading to a decrease in ecological surplus and an increase in ecological deficit. The overall alteration degree is 32%, with a DHRAM level of 3, signifying low hydrological alteration and moderate ecological risk in the region. Furthermore, the biodiversity of the river has markedly declined due to human activities following the alteration.

Funder

National Natural Science Foundation of China Youth Fund Project

Fourteenth Five-Year National Key Research and Project

Publisher

IWA Publishing

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