Volume 35, Issue 2 e14054
ENVIRONMENTAL FLOW MECHANISM AND MANAGEMENT FOR RIVER-LAKE-MARSH SYSTEMS

Quantifying suitable dynamic water levels in marsh wetlands based on hydrodynamic modelling

Peng Hu

Peng Hu

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China

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Zefan Yang

Corresponding Author

Zefan Yang

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China

Correspondence

Zefan Yang, China Institute of Water Resources and Hydropower Research, A-1 Fuxing Road, Haidian District, 100038 Beijing, China.

Email: [email protected]

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Qiande Zhu

Qiande Zhu

State Key Laboratory of Hydrology and Water Resources and Hydraulic Engineering Science, Nanjing Hydraulic Research Institute, Nanjing, China

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Weize Wang

Weize Wang

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China

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Qin Yang

Qin Yang

State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China

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First published: 20 January 2021
Citations: 4
Funding information National Key Research Program of China, Grant/Award Number: 2017YFC0404503; National Natural Science Foundation of China, Grant/Award Number: 51625904; Basic Scientific Research Expense Project of the China Institute of Water Resources and Hydropower Research, Grant/Award Number: WR0145B522017

Abstract

The water level of marsh wetlands is a dominant force controlling the wetland ecosystem function, especially for aquatic habitat. For different species, water level requirements vary in time and space, and therefore ensuring suitable water levels in different periods is crucial for the maintenance of biodiversity in marsh wetlands. Based on hydrodynamic modelling and habitat suitability assessment, we determined suitable dynamic water levels considering aquatic habitat service at different periods in marsh wetlands. The two-dimensional hydrodynamic model was used to simulate the temporal and spatial variation of water level. The habitat suitability for target species at various water levels was evaluated to obtain the fitting curves between Weighted Usable Area (WUA) and water levels. And then suitable water levels throughout the year were proposed according to the fitting curves. Using the Zhalong Wetland (located in northeastern China) as a case study, we confirmed that the proposed MIKE 21 model can successfully be used to simulate the water level process in the wetland. Suitable water levels were identified as being from 143.9–144.2 m for April to May, 144.1–144.3 m for June to September, and 144.3–144.4 m for October to November (before the freezing season). Furthermore, proposed water diversion schemes have been identified which can effectively sustain the proposed dynamic water levels. This study is expected to provide appropriate guidance for the determination of environmental flows and water management strategies in marsh wetlands.

CONFLICT OF INTEREST

The authors declare no potential conflict of interest.

DATA AVAILABILITY STATEMENT

Data which support the findings of this study are available from the corresponding author upon reasonable request.

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