A revised range of variability approach considering the morphological alteration of hydrological indicators
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ORIGINAL PAPER
A revised range of variability approach considering the morphological alteration of hydrological indicators Xin Zheng1 Youwei Qin1
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Tao Yang1 • Tong Cui2 • Chongyu Xu3 • Xudong Zhou4 • Zhenya Li1 • Pengfei Shi1
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Accepted: 27 October 2020 Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A reasonable assessment of the hydrological regime alteration is a prerequisite for river utilization, restoration, and protection. The hydrological alteration is quantified as changes in different indicators (IHAs) identified by Range of Variability Approach (RVA). However, RVA is unable to reveal the morphological characteristic which demonstrates the overall hydrological regime. This will lead to an incomplete assessment of the hydrological alteration. To supplement the current assessment, this work proposed a revised RVA method in three main steps: (1) to identify the morphological characteristics of each IHA; (2) to quantify the morphological alteration by comparing the Hasse matrices of different time series; (3) to combine the frequency alteration and morphological alteration of IHAs for reflecting overall hydrological alteration. A case study of the upper Yellow River shows that the revised RVA method outperforms RVA in the assessment of the hydrological regime not only because revised RVA captures the hydrological changes of certain IHAs that are not reflected by conventional RVA, but also the alteration identified by revised RVA shows more apparent differences at two stations upstream and downstream the dam than conventional RVA can provide. The revised RVA is more applicable to identify the hydrological alteration due to dam construction which could have negative impacts on river ecosystem since the morphological alteration of time series is considered. As a whole, the new method offers a better understanding of the alteration in hydrological regime, which gives beneficial guidance to river management. Keywords Times series analysis Hydrological alteration Yellow River Range of variability approach (RVA)
1 Introduction
& Xin Zheng [email protected] Tao Yang [email protected] 1
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Center for Global Change and Water Cycle, Hohai University, Nanjing 210098, China
2
Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
3
Department of Geosciences, University of Oslo, Sem Saelands vei 1, Blindern, P.O. Box 1047, 0316 Oslo, Norway
4
Institute of Industrial Science, The University of Tokyo, Tokyo, Japan
The stability of hydrological regimes maintains the health of river ecosystems (Wang et al. 2016). While strong alteration of hydrological regime due to human activities and climate change has led to serious problems on river ecosystem and neighboring inhabitants in many rivers over globe (Zhang et al. 2016; Tonkin et al. 2018; Kumar et al. 2018). Therefore, proper assessments for the alteration are essential and can help better understand how the hydrological regime is c
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