Improving City Water Quality through Pollution Reduction with Urban Floodgate Infrastructure and Design Solutions: A Case Study in Wuxi, China

Lan Feng (), Pan Hu, Haisen Wang, Ming-ming Chen and Jiangang Han
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Lan Feng: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Pan Hu: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Haisen Wang: College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
Ming-ming Chen: College of Engineering, University of Alabama, Tuscaloosa, AL 35401, USA
Jiangang Han: College of Environment and Biology, Nanjing Forestry University, Nanjing 210037, China

IJERPH, 2022, vol. 19, issue 17, 1-18

Abstract: Floodgate operation is one of the main forms of river regulation in the development and utilization of river basins. It changes the natural structure, flow process, and correlative environment of rivers. However, there is little analysis of the multiple impacts of small floodgate operation on the water environment in river networks and of the regulation patterns of urban floodgate infrastructure on pollution. In this paper, a one-dimensional hydrodynamic–water quality model, MIKE 11, was used, taking Wuxi’s two main pollutant indicators—the permanganate index (COD Mn ) and ammonia nitrogen (NH 3 -N)—to simulate the water quality response of Wuxi’s river network based on different design solutions of urban floodgate infrastructure. The results show that among the three design scenarios, the order of the decreasing amplitude of the COD Mn and NH 3 -N concentrations was as follows: 1.4 m design solution scenario > 2.1 m design solution scenario > 0.7 m design solution scenario. Meanwhile, under the 1.4 m scenario, the maximum decrease in the COD Mn concentration reached 37.57%, and the maximum decrease in the NH 3 -N concentration reached 206%. In the entire river network system, the improvement in the water quality in the downstream area was significantly better than that in the upstream area. In addition, under the three scenarios of floodgate operation, the changes in pollutant concentrations during the flood season (June–September) were significantly lower than those during the dry season (October–February) and the flat water season (March–May). The research results can provide theoretical support and new ideas for future research on the ecological operation of small floodgates and related research on the water environment effect.

Keywords: small floodgates; river network; design solutions; water environmental model; water pollution (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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