Model for defining environmental flow thresholds of spring flood period using abrupt habitat change analysis

YANG Zhi-feng; YU Shi-wei; CHEN He; SHE Dun-xian

Volume 21 Issue 4

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Advances in Water Science > 2010 > 21(4): 567-574.

YANG Zhi-feng, YU Shi-wei, CHEN He, SHE Dun-xian. Model for defining environmental flow thresholds of spring flood period using abrupt habitat change analysis[J]. Advances in Water Science, 2010, 21(4): 567-574.

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Model for defining environmental flow thresholds of spring flood period using abrupt habitat change analysis

State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China

Funds: The study is financially supported by the National Science Foundation for Distinguished Young Scholars of China(No.50725930),the National Basic Research Program of China(No.2006CB403303)and the State Key Program of National Natural Science Foundation of China(No.50939001).

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Received Date: August 19, 2009

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Abstract

A model for defining environmental flow thresholds is developed using the abrupt habitat change analysis approach.The model takes into account the characteristics of aquatic ecosystems during spring flood periods,and uses the instream flow incremental methodology combined with the River2D model for fish habitat and the Mann-Kendall Method to establish the dynamic relation between the habitat and runoff.The model is tested on the data from the Wudaogou station located at the downstream of Huifa River.The data includes the streamflow velocities and water levels representing the habitat of the carp fish,as well as the monthly runoff of spring flood period from 1956 to 2000. The result of the Mann-Kendall analysis shows that the habitat of carp has undergone an abrupt change beginning in 1970.Prior to the abrupt change,the 95% confidence interval on the weighted usable area ranges from 275.5 to 915.7 m²/km,and the corresponding streamflow discharges taken as the environmental flow thresholds are from 58.8 to 121.1 m³/s.Spring flooding occurs after the icebound season,and the appropriate environmental flow of spring flood period is very important for the aquatic organisms and the entire ecosystem.
- environmental flow,
- habitat,
- carp,
- River2D,
- Mann-Kendall Method,
- Songhua River

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