Water Science and Technology (May 2024)
Research on the connectivity of urban river network–wetland and water quality simulation
Abstract
The connectivity of urban river networks plays an important role in cities in many aspects, such as urban water safety, water quality (WQ), and aquatic ecological balance. This study focuses on the river network and the Majiawan Wetland in the Chaoyang District of Beijing by establishing a two-dimensional hydrological WQ model employing various water allocation schemes between the river network and the wetland. Water circulation and WQ are the main indexes, and the effects of different scenarios on improving water circulation and WQ are simulated and compared. This study demonstrates that the addition of water replenishment at the intersection of river network and internal slow-water zones of the wetland (Scheme 2) has greater effectiveness in improving both hydrology and WQ compared to two other schemes. The water area of the Majiawan Wetland has expanded, and water velocity has increased. Using chemical oxygen demand, total nitrogen, and total phosphorus as the index values for determining the water class, the WQ of about 20% of the wetland area was reached Water Class II (domestic drinking water), with Water Class III (general industrial water) accounting for the other 80%. This study provides valuable evaluation and reference for similar areas of urban river network connectivity. HIGHLIGHTS This study established a comprehensive hydrological and water quality model for the urban river network-wetlands system.; We simulated and analyzed the water cycle allocation schemes of the urban river network-wetlands from the water allocation, water quality index changes and environmental impact evaluation, by using the established mathematical model.; The research results would offer valuable insights for optimizing water resource allocation and improving water quality in the study area and similar water systems.;
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