A Coupled Modeling Approach for Water Management in a River–Reservoir System

Zhenyu Zhang, Jinliang Huang, Min Zhou, Yaling Huang and Yimin Lu
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Zhenyu Zhang: Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China
Jinliang Huang: Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China
Min Zhou: Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China
Yaling Huang: Coastal and Ocean Management Institute, Xiamen University, Xiamen 361102, China
Yimin Lu: Spatial Information Research Center of Fujian Province, Fuzhou University, Fuzhou 350108, China

IJERPH, 2019, vol. 16, issue 16, 1-14

Abstract: A coupled model is an effective tool to understand the nutrient fate associated with hydrodynamic and ecosystem processes and thereby developing a water resource management strategy. This paper presents a coupled modeling approach that consists of a watershed model and a hydrodynamic model to evaluate the nutrient fate in a river–reservoir system. The results obtained from the model showed a good agreement with field observations. The results revealed that the Shuikou reservoir (Fuzhou, China)exhibited complicated hydrodynamic characteristics, which may induce the pattern of nutrient export. Reservoirs can greatly lower water quality as a result of decreasing water movement. Three scenarios were analyzed for water management. The NH 3 -N (Ammonia Nitrogen) decreased sharply in the outlet of Shuikou reservoir after NH 3 -N level in its tributary was reduced. After removing the farming cages, the water quality of the outlet of Shuikou reservoir was improved significantly. The DO (Dissolved Oxygen) had increased by 3%–10%, NH 3 -N had reduced by 5%–17%, and TP (Total Phosphorus) had reduced by 6%–21%. This study demonstrates that the proposed coupled modeling approach can effectively characterize waterway risks for water management in such a river–reservoir system.

Keywords: Hydrological Simulation Program Fortran (HSPF); Environmental Fluid Dynamics Code (EFDC); modeling; river-reservoir continuum; watershed management (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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