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A hydrologic index based method for determining ecologically acceptable water-level range of Dongting Lake

Jie Liang, Xun Yu, Guangming Zeng, Haipeng Wu, Xu Lai, Xiaodong Li, Lu Huang, Yujie Yuan, Shenglian Guo, Juan Dai
  • Xun Yu
    Hunan University, China
  • Guangming Zeng
    Hunan University, China
  • Haipeng Wu
    Hunan University, China
  • Xu Lai
    Hunan University, China
  • Xiaodong Li
    Hunan University, China
  • Lu Huang
    Hunan University, China
  • Yujie Yuan
    Hunan University, China
  • Shenglian Guo
    Wuhan University, China
  • Juan Dai
    Hunan University, China

Abstract

Water-level fluctuation (WLF) is regarded as a key environmental factor for lake ecosystems. Keeping moderate WLFs approximating to its natural conditions is substantially essential to maintain its biodiversity and integrity. In this study, a hydrological index based method for determining ecologically acceptable water-level range (EAWLR) was illustrated by a case-study of Dongting Lake. This method was proposed based on a consideration of hydrological alterations induced by natural variability and human activity. It was during this process that two hydrological indices, the ratio flow deviation (RFD) and the amended annual proportional flow deviation (AAPFD), played vital roles in change point detection and the determination of EAWLR, respectively. The WLFs are closely related to species richness. The relationship between them follows a hump-backed curve and EAWLR serves as the hump part of the curve. The final results indicated that EAWLRs of Beijinggang, Nanzui and Chenglingji during flood season were 27.78-38.26 m, 25.19-38.45 m and 24.48-30.96 m, respectively, while those during non-flood season were 18.33-27.79m, 17.68-29.19 m and 15.59-22.07 m, respectively. The response to the great flood in 1998 and the drought in 2006 of Dongting Lake region verified the rationality of the results. Within the EAWLR, ecosystems can operate normally and have stable community structures to resist external interference.

Keywords

Water-level fluctuations, ecologically acceptable water-level range, ratio flow deviation, amended annual proportional flow deviation, hydrological alteration.

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Submitted: 2013-12-03 09:50:43
Published: 2014-08-04 15:26:19
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Copyright (c) 2014 Jie Liang, Xun Yu, Guangming Zeng, Haipeng Wu, Xu Lai, Xiaodong Li, Lu Huang, Yujie Yuan, Shenglian Guo, Juan Dai

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