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Article

Informing Environmental Flow Planning through Landscape Evolution Modeling in Heavily Modified Urban Rivers in China

1
Department of Landscape Architecture, Beijing Forestry University, Beijing 100083, China
2
Department of Landscape Architecture, The Pennsylvania State University, University Park, PA 16801, USA
3
Institutes of Energy and the Environment, The Pennsylvania State University, University Park, PA 16801, USA
*
Author to whom correspondence should be addressed.
Academic Editor: František Petrovič
Water 2021, 13(22), 3244; https://doi.org/10.3390/w13223244
Received: 27 September 2021 / Revised: 10 November 2021 / Accepted: 13 November 2021 / Published: 16 November 2021
(This article belongs to the Section Hydrology)
Worldwide, urban rivers suffer various degrees of ecological degradation. Rehabilitating heavily modified urban rivers requires holistic approaches, including environmental flow management. We examine the case of Lower Yongding River, Beijing’s mother river, which had dried up since the 1980s and is undergoing a flow replenishment experiment, receiving 342 million m3 of water during 2019–2020 for ecosystem enhancement. Considering the massive cost of replenishment, we address the urgent need to evaluate its outcomes and inform future management through an interdisciplinary modeling approach under the circumstance of severe data shortage. We simulated the study reach’s landscape evolution under five flow scenarios and assessed their ecological effects using the CAESAR-Lisflood model and habitat suitability index method. Despite overall minor morphological differences across scenarios, individual reaches presented pronounced physical changes. Higher-flow scenarios shaped a distinct channel in certain reaches, but historic channel modifications by mining and farming caused minimal responses in others. Additionally, higher-flow scenarios generally created larger and more evenly distributed habitat areas but showed a low payback given the higher flow volumes needed. Targeted channel-floodplain geomorphological restoration is essential for flows to generate desired ecological outcomes. The demonstrated modeling framework offers great promise, informing future rehabilitation actions for heavily modified urban streams. View Full-Text
Keywords: stream ecological rehabilitation; environmental flow; landscape evolution simulation; CAESAR-Lisflood; habitat suitability; Yongding River stream ecological rehabilitation; environmental flow; landscape evolution simulation; CAESAR-Lisflood; habitat suitability; Yongding River
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MDPI and ACS Style

Wu, M.; Wu, H.; Warner, A.T.; Li, H.; Liu, Z. Informing Environmental Flow Planning through Landscape Evolution Modeling in Heavily Modified Urban Rivers in China. Water 2021, 13, 3244. https://doi.org/10.3390/w13223244

AMA Style

Wu M, Wu H, Warner AT, Li H, Liu Z. Informing Environmental Flow Planning through Landscape Evolution Modeling in Heavily Modified Urban Rivers in China. Water. 2021; 13(22):3244. https://doi.org/10.3390/w13223244

Chicago/Turabian Style

Wu, Minghao, Hong Wu, Andrew T. Warner, Hao Li, and Zhicheng Liu. 2021. "Informing Environmental Flow Planning through Landscape Evolution Modeling in Heavily Modified Urban Rivers in China" Water 13, no. 22: 3244. https://doi.org/10.3390/w13223244

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