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Open AccessArticle

Analysis of an Ecological Flow Regime during the Ctenopharyngodon Idella Spawning Period Based on Reservoir Operations

1
School of Hydropower and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
2
Hubei Key Laboratory of Digital Valley Science and Technology, Wuhan 430074, China
3
Changjiang River Scientific Research Institute of Changjiang Water Resources Commission, Wuhan 430015, China
4
Central-southern Safety and Environment Technology Institute Co LTD, Wuhan 430051, China
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 2034; https://doi.org/10.3390/w11102034
Received: 15 June 2019 / Revised: 18 September 2019 / Accepted: 24 September 2019 / Published: 29 September 2019
(This article belongs to the Special Issue Environmental Flows, Ecological Quality and Ecosystem Services)
The study of fish habitats is important for us to better understand the impact of reservoir construction on river ecosystems. Many habitat models have been developed in the past few decades. In this study, a fuzzy logic-based habitat model, which couples fuzzy inference system, two-dimensional laterally averaged hydrodynamic model, and two-dimensional shallow water hydrodynamic model, is proposed to identify the baseline condition of suitable habitat for fish spawning activities. The proposed model considers the reservoir and the downstream river channel, and explores the comprehensive effects of water temperature, velocity, and water depth on habitat suitability. A real-world case that considers the Ctenopharyngodon idella in the Xuanwei Reservoir of Qingshui River is studied to investigate the effect of in- and outflow of reservoir on fish habitat and the best integrative management measure of the model. There were 64 simulations with different reservoir in- and outflows employed to calculate the weighted usable area and hydraulic habitat suitability. The experimental results show that the ecological flow for Ctenopharyngodon idella spawning can satisfy the basic demand when the reservoir inflow is greater than 60 m3/s and the reservoir outflow is greater than 100 m3/s. The habitat ecological suitability is the best when the reservoir outflow is 120 m3/s. A more reasonable and reliable ecological flow range can be obtained based on the habitat model in this paper, which provides the best scenario for water resources planning and management in the Qingshui River Basin. View Full-Text
Keywords: water temperature; fuzzy logic; habitat model; spawning period; ecological flow water temperature; fuzzy logic; habitat model; spawning period; ecological flow
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Li, J.; Qin, H.; Pei, S.; Yao, L.; Wen, W.; Yi, L.; Zhou, J.; Tang, L. Analysis of an Ecological Flow Regime during the Ctenopharyngodon Idella Spawning Period Based on Reservoir Operations. Water 2019, 11, 2034.

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