Publications
6 results found
Peng F, Liu L, Gao Y, et al., 2023, Evaluating the impact of urban wetlands as nature-based solutions at the catchment scale
<jats:p>During COP14 in 2022, Ramsar Convention commended 25 cities around the world for their efforts to protect urban wetlands. With the development of cities and the increase in land demand, the trend is to reduce the number of open blue spaces. Yet when preserved and sustainably used, urban nature-based solutions in the form of constructed wetlands could provide water management benefits including water quality regulation and flood mitigation. However, these water management benefits have rarely been evaluated at a catchment scale, and the mechanisms behind them are not fully understood, both of which hinder effective integrated constructed wetlands planning. We aim to explore the impact of wetland changes on water quality and quantity at the catchment scale. This study firstly evaluates the benefits by analysing the monitoring water quantity and quality datasets before and after the wetland construction in Enfield catchment, London. To understand the mechanisms behind the benefits, we build a Water Systems Integration Modelling framework (WSIMOD) to simulate the catchment-scale water cycle. This model is validated against monitoring river flow and water quality data. The constructed wetlands are then conceptualised and integrated into the WSIMOD, and their interactions with the catchment water cycle are simulated. Scenarios are constructed to analyse the impacts of different configurations and sizes of the constructed wetlands on the catchment water cycle. The results show that urban wetlands play a role in flood detention and water quality purification of watershed water resources at the catchment scale. Scattered small wetlands can more effectively reduce the impact of a flood under the same total wetland area. The results provide useful insights into the planning of constructed wetlands for maximising the water management benefits at a catchment scale. Future studies could focus on representing the interaction between the quantity and quality of water
Chen Z, Feng J, Li R, et al., 2022, Field observation and numerical modelling of supersaturated dissolved gas at river confluence, ECOLOGICAL MODELLING, Vol: 471, ISSN: 0304-3800
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Peng F, Shi X, Li K, et al., 2022, How to comprehensively evaluate river discharge under the influence of a dam, Ecological Informatics, Vol: 69, Pages: 1-11, ISSN: 1574-9541
The dams in the upper reaches of the Yangtze River are highly concentrated. Dam construction can effectively solve water shortage problems; however, the natural hydrological regimes of rivers have changed to varying degrees under the influence of water conservancy projects. In this study, a comprehensive method is proposed to analyze the hydrological regime changes in a river impacted by a dam through the evaluation of hydrological periodicity, hydrological frequency and hydrological parameters. Hydrological periodicity is used to evaluate the time series from the vertical multiyear perspective, while hydrological frequency is used to evaluate the time series from the horizontal one-year perspective. The two parameters have complementary roles. The indicators of hydrologic alteration and environmental flow component parameters are used to analyze the changes in various hydrological factors affected by the dam. The results demonstrate that the construction of dams can change the multiyear periodicity of the flow and reduce the peak flow. As a result, downstream fish may be unable to sense the reduced floods and fail to spawn. The indicators of hydrologic alteration and environmental flow component parameters can complement each other and can be used to evaluate changes in a hydrological regime influenced by a dam. This comprehensive method can be used to analyze how the hydrological regime is affected by this dam.
Peng F, Li K, Liang R, et al., 2021, Shallow lake water exchange process before and after water diversion projects as affected by wind field, Journal of Hydrology, Vol: 592, Pages: 125785-125785, ISSN: 0022-1694
Peng F, Li K, Liang R, et al., 2020, Positive effect of a canal system and reservoir group on the spatial-temporal redistribution of water resources in a pinnate drainage pattern, Science of The Total Environment, Vol: 744, Pages: 1-15, ISSN: 0048-9697
The uneven spatial and temporal distribution of water resources in pinnate drainage patterns is a major problem worldwide. As scattered components of water conservancy projects, systems of canals and groups of reservoirs in a basin can redistribute water resources in time and space to solve problems. This redistribution effectively avoids the environmental impact inherent in centralized water conservancy projects. In this study, we focused on a network of 88 reservoirs and 675 km of canals in a basin with a pinnate drainage pattern. The discharge of the trunk stream in the basin was calculated in natural, present and forecasted conditions based on the hydrological frequency curve. Then, the hydrodynamics of the trunk stream were simulated by the HEC-RAS model. Furthermore, we analysed the temporal and spatial distribution of water resources in five zones in the basin by Morlet wavelet analysis to determine the balance between water supply and demand. The results demonstrated that the river catchment in the basin changed periodically over periods of 1 year, 8 years and 18 years, as affected by the reservoir groups. The canal system played a major role in water resource transport in the five zones in the basin. The joint action of the reservoir group and canal system reduced the gap between the supply and demand water balance from 27.11% to 0.89%. This study focused on the influence of decentralized water conservancy projects on the spatial and temporal distribution of water resources and provides ideas for solving the problem of water resource allocation in the studied basin.
Li X, Liu B, Wang Y, et al., 2020, Hydrodynamic and environmental characteristics of a tributary bay influenced by backwater jacking and intrusions from a main reservoir, Hydrology and Earth System Sciences, Vol: 24, Pages: 5057-5076, ISSN: 1027-5606
The construction of large reservoirs results in the formation of tributary bays, and tributary bays are inevitably influenced by backwater jacking and intrusions from the main reservoir. In this paper, a typical tributary bay (Tangxi River) of the Three Gorges Reservoir (TGR) was selected to study the hydrodynamic and environmental characteristics of a tributary bay influenced by the jacking and intrusions from the main reservoir. The flow field, water temperature, and water quality of Tangxi River were simulated using the hydrodynamic and water quality model CE-QUAL-W2 (thomas and Scott, 2008), and the eutrophication status of the tributary bay was also evaluated. The results showed that the main reservoir had different effects on its tributary bay in each month. The tributary bay was mainly affected by backwater jacking from the main reservoir when the water level of the main reservoir dropped and by intrusions from the main reservoir when the water level of the main reservoir rose. An obvious water quality concentration boundary existed in the tributary bay, which was consistent with the regional boundary in the flow field. The flow field and water quality on both sides of the boundary were quite different. The results of this study can help us figure out how the backwater jacking and intrusions from the main reservoir influence the hydrodynamic and water environment characteristics of the tributary bay and provide guidance for water environment protection in tributary bays.
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