Article
Environmental Sciences
Lei Xu, Saiyu Yuan, Hongwu Tang, Jiajian Qiu, Yang Xiao, Colin Whittaker, Carlo Gualtieri
Summary: Mixing processes downstream of river confluences have significant impacts on the ecology and environmental management of river networks. This study investigates the mixing dynamics at the confluence between the Yangtze River and the Poyang Lake in China. Results show that the mixing dynamics are influenced by various factors, including the momentum flux ratio, secondary flow, and the lock-exchange flow associated with density differences. Slow mixing is observed during high-flow conditions, while rapid mixing is observed during low-flow conditions. Additionally, the lock-exchange flow enhances mixing when the Yangtze River waters have higher temperature.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Saiyu Yuan, Hongwu Tang, Kun Li, Lei Xu, Yang Xiao, Carlo Gualtieri, Colin Rennie, Bruce Melville
Summary: The study found that at the confluence between the Yangtze River and Poyang Lake, dual counter-rotating cells were observed under high flow conditions, while a single secondary cell appeared under low flow conditions. These helical cells restricted the core size of high sediment concentration and hindered the exchange of sediment between the two rivers.
WATER RESOURCES RESEARCH
(2021)
Article
Water Resources
Chenyang Xue, Qi Zhang, Yuxue Jia, Saiyu Yuan
Summary: In the study region of the middle Yangtze River-Poyang Lake-catchment in China, the natural hydrological regime has been altered by climate conditions and human activities, resulting in frequent droughts. The potential recovery capacity of existing reservoirs and a proposed hydraulic project to restore the hydrological regime was assessed. Findings show that joint regulation of existing reservoirs can fully restore the hydrological regime in typical years, but not during extremely dry years. However, the proposed hydraulic project can restore the lake to a reasonable water level even in extreme droughts like 2022.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Environmental Sciences
Chenyu Jiang, George Constantinescu, Saiyu Yuan, Hongwu Tang
Summary: In this study, numerical techniques are used to investigate the flow dynamics and mixing at the asymmetric confluence between the Yangtze River and the Poyang Lake channel. The effects of density contrast between the confluent flows and its impact on the flow structure and thermal mixing are also examined. The study found that density contrast leads to lateral near-bed intrusions and strong tilting of the mixing interface boundaries, ultimately increasing mixing at large distances from the confluence apex.
ENVIRONMENTAL FLUID MECHANICS
(2023)
Article
Engineering, Civil
Huawu Wu, Qi Huang, Congsheng Fu, Fan Song, Jinzhao Liu, Jing Li
Summary: The interactions between the Yangtze River and Poyang Lake are undergoing rapid changes due to human activities and climate change. The isotopic compositions in river and lake water show temporal heterogeneity across seasons but spatial homogeneity, suggesting the influence of local precipitation, groundwater, and lake hydrology. The study also highlights the importance of precipitation as the main water source for the lake and river, as well as the impact of Three Gorges Dam regulation and water discharge in the complex lake-river interactions.
JOURNAL OF HYDROLOGY
(2021)
Article
Geosciences, Multidisciplinary
Peipei Zhang, Jingqiao Mao, Mingming Tian, Lingquan Dai, Tengfei Hu
Summary: The operation of the Three Gorges Reservoir has significant effects on the downstream water exchange between the Yangtze River and Poyang Lake. A machine learning model was developed to assess these effects, showing that the reservoir operation has a greater impact in wet years. In dry years, it helps maintain lake water levels, while in wet years, it aids in flood control in the lake area.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Multidisciplinary Sciences
Chenge An, Hongwei Fang, Li Zhang, Xinyue Su, Xudong Fu, He Qing Huang, Gary Parker, Marwan A. Hassan, Nooreen A. Meghani, Alison M. Anders, Guangqian Wang
Summary: This passage explains why two large lakes, Dongting Lake and Poyang Lake, exist along the Yangtze River. It suggests that rising sea levels due to deglaciation caused a wave of water surface elevation and bed aggradation. The blockage of tributaries by the main stem's aggradation resulted in the formation of the lakes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Environmental Sciences
Biqing Tian, Peng Gao, Xingmin Mu, Guangju Zhao
Summary: In this study, changes in the water area of Poyang Lake from 1977-2021 were investigated using remote sensing imagery, hydrological data, meteorological data, and land use surveys. The results showed that the water area of Poyang Lake decreased during the study period, primarily due to changes in river runoff and sediment load. The construction of the Three Gorges Dam also played a role in reducing water flow into the lake, resulting in a decrease in water area in certain seasons.
Article
Environmental Sciences
Qiyue Li, Mingming Deng, Wenya Li, Yue Pan, Geying Lai, Ying Liu, Adam Thomas Devlin, Weiping Wang, Shupin Zhan
Summary: Habitats of freshwater cetaceans are facing increasing threats globally, and it is crucial to have a complete understanding of the long-term variations of habitat configurations. Poyang Lake in China is home to a large and stable population of critically endangered Yangtze finless porpoise. However, declining water levels and increased human activities in the lake since 2000 have raised concerns for porpoise conservation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Wenyu Wang, Peng Yang, Jun Xia, Heqing Huang, Jiang Li
Summary: This study analyzed the spatial and temporal distribution characteristics of nutrients and investigated the effects of land use on water quality in Poyang Lake. The accuracy of water quality inversion models varied, but overall they were consistent. The optimal inversion method also varied for different water quality parameters. The influence of land use on water quality varied at different scales of buffer zones.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Fisheries
Chen Zhang, Mingzheng Li, Tao Chang, Xin Gao, Huanzhang Liu, Wenxuan Cao
Summary: The study found that lateral hydrological connectivity plays a crucial role in shaping fish assemblages between the Yangtze River and Poyang Lake, with significant seasonal differences influenced by water temperature, water level, and fish migration. Fish species in the river-floodplain system exhibit species-specific migration dynamics, which are related to their life-history traits. Temporal-spatial interactions in the fish community are essentially derived from evolutionary adaptation to the monsoon climate, providing insights for managing river-floodplain systems effectively.
ECOLOGY OF FRESHWATER FISH
(2021)
Article
Environmental Sciences
Bing Li, Guishan Yang, Rongrong Wan, Xijun Lai, Paul D. Wagner
Summary: This study investigates the long-term changes of five key ecosystem services in China's Poyang Lake and examines the impact of the Three Gorges Dam on hydrology. The results show that Poyang Lake provides significant ecosystem services, but these services have been decreasing since the 2000s.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Geography, Physical
Maofeng He, Fengxian Bu, Claudio O. Delang, Jialin Xie, Quan Ye, Hongfei Zhao, Qilin He, Wenming He
Summary: The study focused on environmental changes in the Poyang Lake Basin in China over the past 2000 years, analyzing the impacts of climate change on agricultural production and the direct evidence of climate change seen in lake water volume changes. The research also found significant interactions between population, agricultural scale, and lake environment changes in the region.
Article
Zoology
Peng -Xiang Duan, Zhi-Tao Wang, Tomonari Akamatsu, Nick Tregenza, Guang-Yu Li, Ke-Xiong Wang, Ding Wang
Summary: The biosonar activities of the Yangtze finless porpoise in the river-lake corridor are correlated with anthropogenic impacts and environmental variables. The corridor plays a key role in the conservation of the porpoise. During the COVID-19 lockdown, there was a significant increase in porpoise sonar detection. The detection of porpoise click trains and buzzes showed a significant negative correlation with boat traffic intensity. Light levels and hydrological conditions also significantly influenced porpoise biosonar activities.
ZOOLOGICAL RESEARCH
(2023)
Article
Engineering, Civil
Zhenchen Wang, Yun Yang, Gan Chen, Jianfeng Wu, Jichun Wu
Summary: In the Poyang Lake Basin in China, a regional three-dimensional groundwater numerical model was used to quantify changes in surface water-groundwater interactions. Results showed that groundwater storage variation in bank storage districts can be used as an indicator, with surface water infiltration playing a dominant role in constructing bank storage. This research highlights the impact of anthropogenic activities, such as the operation of the Three Gorges Dam, on the regional water cycle mechanism and the vulnerability of the groundwater system.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Civil
Farhad Bahmanpouri, Carlo Gualtieri, Hubert Chanson
Summary: This experimental study presents some basic characteristics of a classic hydraulic jump flow over a pebbled rough bed and a smooth bed as a reference. The differences between the two bed configurations include different air entrainment processes, larger vortical structures, and stronger backward flow on the rough bed. The study also found that the jump roller and aerated flow lengths were shorter on the rough bed, while the dimensionless advection velocity of large vortices was the same for both bed types.
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-WATER MANAGEMENT
(2023)
Review
Mechanics
Sai-yu Yuan, Lei Xu, Hong-wu Tang, Yang Xiao, Carlo Gualtieri
Summary: Confluences play a critical role in river systems, impacting hydrodynamics, sediment transport, bed morphology, and eco-hydraulics. The complex mechanisms of flow momentum and mass mixing at confluences can have significant effects on the aquatic environment, leading to changes in water temperature, sediment load, nutrient concentrations, and more. Understanding the dynamics of river confluences is crucial for studying water environment and ecology.
JOURNAL OF HYDRODYNAMICS
(2022)
Article
Engineering, Civil
Javad Ahadiyan, Farhad Bahmanpouri, Atefeh Adeli, Carlo Gualtieri, Alireza Khoshkonesh
Summary: This study conducted experiments to investigate the effects of soil properties, rip-rap, and cohesive/non-cohesive soil materials on the breaching process and failure mechanism of levees. The results indicate the crucial role of rip-rap coverage and soil properties in protecting levees from breaching.
WATER RESOURCES MANAGEMENT
(2022)
Article
Geography, Physical
Saiyu Yuan, Yunqiang Zhu, Hongwu Tang, Lei Xu, Kun Li, Yang Xiao, Carlo Gualtieri
Summary: This study investigates a multi-channel confluence between the Yarlung Zangbo River and its major tributary, the Niyang River. The study finds that the confluence is stable compared to its upstream and downstream reaches. The separation of the Niyang River inflows by a delta creates a mixing interface and secondary cells in the Yarlung Zangbo River. The curved riverbank plays a significant role in the formation of deep scour holes and heterogeneity of velocity distribution.
Article
Environmental Sciences
Kun Li, Hongwu Tang, Saiyu Yuan, Lei Xu, Yang Xiao, Carlo Gualtieri
Summary: This study investigates the sediment and morphological characteristics at the confluence between the Yangtze River and the outflow channel of Poyang Lake. The submergence of the floodplain has an impact on these characteristics. The study reveals that sediment transport modes and bed morphology vary with water levels and the submergence of the floodplain.
INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH
(2022)
Article
Engineering, Civil
Farhad Bahmanpouri, Silvia Barbetta, Carlo Gualtieri, Marco Ianniruberto, Naziano Filizola, Donatella Termini, Tommaso Moramarco
Summary: In this study, an entropy-based method was used to monitor and analyze the velocity of large rivers. The results showed good agreement with in-situ ADCP measurements, demonstrating the potential of the entropy method for estimating discharge and velocity in very large rivers relying solely on near-surface velocity monitoring.
JOURNAL OF HYDROLOGY
(2022)
Article
Agricultural Engineering
Xianglai Zeng, Carlo Gualtieri, Alan Cuthbertson, Dongdong Shao
Summary: This experimental study analyzed the flow patterns and mass transport processes in the near wake region of a steady current through a rigid metal net panel, and compared it with a flexible net panel. The results showed that the rigid net panel had advantages over the flexible net panel in terms of lateral spreading, flow blockage reduction, turbulent intensity reduction, and enhanced scalar mixing and concentration decay rates in the near-wake region.
AQUACULTURAL ENGINEERING
(2022)
Article
Water Resources
Yang Xiao, Jiaming Liu, Nairu Wang, Carlo Gualtieri, Taotao Zhang, Jieqing Liu, Jun Fu, Jian Zhou
Summary: This paper investigates the transverse hyporheic transport and biogeochemical reactions in a compound channel using a coupled 3D hydrodynamic model and 2D groundwater flow and biogeochemical model. The study verifies the model results through laboratory measurements and examines the effects of bank slope angle, ambient groundwater flow, and ambient groundwater solute concentration on aerobic and anaerobic biogeochemical processes. The findings reveal the location of the denitrification zone and the importance of bank slope angle in nitrogen removal.
HYDROLOGICAL PROCESSES
(2022)
Article
Environmental Sciences
Lei Xu, Saiyu Yuan, Hongwu Tang, Jiajian Qiu, Yang Xiao, Colin Whittaker, Carlo Gualtieri
Summary: Mixing processes downstream of river confluences have significant impacts on the ecology and environmental management of river networks. This study investigates the mixing dynamics at the confluence between the Yangtze River and the Poyang Lake in China. Results show that the mixing dynamics are influenced by various factors, including the momentum flux ratio, secondary flow, and the lock-exchange flow associated with density differences. Slow mixing is observed during high-flow conditions, while rapid mixing is observed during low-flow conditions. Additionally, the lock-exchange flow enhances mixing when the Yangtze River waters have higher temperature.
WATER RESOURCES RESEARCH
(2022)
Article
Physics, Fluids & Plasmas
Milad Abdollahpour, Paola Gualtieri, David F. Vetsch, Carlo Gualtieri
Summary: This study validated the characteristics of the classical 2D backward-facing step flow using OpenFOAM, with good agreement between the numerical results and experimental data under laminar and turbulent flow conditions. The effect of a cylinder placed at different locations downstream of the step on the flow structure was also investigated.
Article
Engineering, Civil
Xiang Wang, Carlo Gualtieri, Wenxin Huai
Summary: The impact of aquatic vegetation on weak bed-load transport rates in riverbeds was investigated through laboratory experiments. It was observed that the transport rate increased with an increase in energy slope and a decrease in vegetation density. The traditional method of calculating bed shear stress was unable to predict the measured transport rate, but a new method considering grain shear stress provided a reasonable prediction. The proposed models were found to be more accurate than existing literature models, improving understanding of bed-load transport in vegetated flows.
JOURNAL OF HYDROLOGY
(2023)
Article
Physics, Fluids & Plasmas
Milad Abdollahpour, Paola Gualtieri, David F. Vetsch, Carlo Gualtieri
Summary: In this study, the effect of a cylinder placed downstream of a two-dimensional backward-facing step flow was numerically investigated. The numerical simulations without the cylinder were validated in the laminar regime, and the effect of the cylinder was studied in both laminar and turbulent regimes. The presence of the cylinder altered the flow structure and increased the skin friction coefficient in certain locations, while the step significantly influenced the generation and shedding of vortices.
Article
Water Resources
Hongwu Tang, Yang Yu, Saiyu Yuan, Zhipeng Li, Hao Cao, Chenyu Jiang, Carlo Gualtieri
Summary: This study investigates the contributions of wind and backflow to the sediment transport process in Poyang Lake using a numerical model. The results show that backflow mainly impacts the hydrodynamics of narrow waterways, while wind forces primarily influence the hydrodynamics of the open expanse of the lake. Dominant wind leads to the formation of gyres, pushing sediment into upstream areas.
HYDROLOGY RESEARCH
(2023)
Article
Engineering, Civil
Saiyu Yuan, Jiajian Qiu, Hongwu Tang, Lei Xu, Yang Xiao, Mengyang Liu, Colin Rennie, Carlo Gualtieri
Summary: River confluences are important hotspots for fish productivity and diversity due to the abundance of food and complex habitat conditions. However, limited research has been done on the relationship between fish community traits and habitat characteristics at large river confluences. This study conducted field surveys at the confluence between the Yangtze River and the Poyang Lake outflow channel and found high spatial heterogeneity of fish density, size, and species near the confluence. The convergence of the two tributaries created optimal habitat conditions and resulted in the highest fish abundance and species diversity in the post-confluence channel.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Arfan Arshad, Ali Mirchi, Javier Vilcaez, Muhammad Umar Akbar, Kaveh Madani
Summary: High-resolution, continuous groundwater data is crucial for adaptive aquifer management. This study presents a predictive modeling framework that incorporates covariates and existing observations to estimate groundwater level changes. The framework outperforms other methods and provides reliable estimates for unmonitored sites. The study also examines groundwater level changes in different regions and highlights the importance of effective aquifer management.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Lihua Chen, Jie Deng, Wenzhe Yang, Hang Chen
Summary: A new grid-based distributed karst hydrological model (GDKHM) is developed to simulate streamflow in the flood-prone karst area of Southwest China. The results show that the GDKHM performs well in predicting floods and capturing the spatial variability of karst system.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Faruk Gurbuz, Avinash Mudireddy, Ricardo Mantilla, Shaoping Xiao
Summary: Machine learning algorithms have shown better performance in streamflow prediction compared to traditional hydrological models. In this study, researchers proposed a methodology to test and benchmark ML algorithms using artificial data generated by physically-based hydrological models. They found that deep learning algorithms can correctly identify the relationship between streamflow and rainfall in certain conditions, but fail to outperform traditional prediction methods in other scenarios.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yadong Ji, Jianyu Fu, Bingjun Liu, Zeqin Huang, Xuejin Tan
Summary: This study distinguishes the uncertainty in drought projection into scenario uncertainty, model uncertainty, and internal variability uncertainty. The results show that the estimation of total uncertainty reaches a minimum in the mid-21st century and that model uncertainty is dominant in tropical regions.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Z. R. van Leeuwen, M. J. Klaar, M. W. Smith, L. E. Brown
Summary: This study quantifies the effectiveness of leaky dams in reducing flood peak magnitude using a transfer function noise modelling approach. The results show that leaky dams have a significant but highly variable impact on flood peak magnitude, and managing expectations should consider event size and type.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Zeda Yin, Yasaman Saadati, M. Hadi Amini, Linlong Bian, Beichao Hu
Summary: Combined sewer overflows pose significant threats to public health and the environment, and various strategies have been proposed to mitigate their adverse effects. Smart control strategies have gained traction due to their cost-effectiveness but face challenges in balancing precision and computational efficiency. To address this, we propose exploring machine learning models and the inversion of neural networks for more efficient CSO prediction and optimization.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Qimou Zhang, Jiacong Huang, Jing Zhang, Rui Qian, Zhen Cui, Junfeng Gao
Summary: This study developed a N-cycling model for lowland rural rivers covered by macrophytes and investigated the N imports, exports, and response to sediment dredging. The findings showed a considerable N retention ability in the study river, with significant N imports from connected rivers and surrounding polders. Sediment dredging increased particulate nitrogen resuspension and settling rates, while decreasing ammonia nitrogen release, denitrification, and macrophyte uptake rates.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Xue Li, Yingyin Zhou, Jian Sha, Man Zhang, Zhong-Liang Wang
Summary: High-resolution climate data is crucial for predicting regional climate and water environment changes. In this study, a two-step downscaling method was developed to enhance the spatial resolution of GCM data and improve the accuracy for small basins. The method combined medium-resolution climate data with high-resolution topographic data to capture spatial and temporal details. The downscaled climate data were then used to simulate the impacts of climate change on hydrology and water quality in a small basin. The results demonstrated the effectiveness of the downscaling method for spatially differentiated simulations.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Tongqing Shen, Peng Jiang, Jiahui Zhao, Xuegao Chen, Hui Lin, Bin Yang, Changhai Tan, Ying Zhang, Xinting Fu, Zhongbo Yu
Summary: This study evaluates the long-term interannual dynamics of permafrost distribution and active layer thickness on the Tibetan Plateau, and predicts future degradation trends. The results show that permafrost area has been decreasing and active layer thickness has been increasing, with an accelerated degradation observed in recent decades. This has significant implications for local water cycle processes, water ecology, and water security.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Chi Zhang, Xu Zhang, Qiuhong Tang, Deliang Chen, Jinchuan Huang, Shaohong Wu, Yubo Liu
Summary: Precipitation over the Tibetan Plateau is influenced by systems such as the Asian monsoons, the westerlies, and local circulations. The Indian monsoon, the westerlies, and local circulations are the main systems affecting precipitation over the entire Tibetan Plateau. The East Asian summer monsoon primarily affects the eastern Tibetan Plateau. The Indian monsoon has the greatest influence on precipitation in the southern and central grid cells, while the westerlies have the greatest influence on precipitation in the northern and western grid cells. Local circulations have the strongest influence on the central and eastern grid cells.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Manuel Almeida, Antonio Rodrigues, Pedro Coelho
Summary: This study aimed to improve the accuracy of Total Phosphorus export coefficient models, which are essential for water management. Four different models were applied to 27 agroforestry watersheds in the Mediterranean region. The modeling approach showed significant improvements in predicting the Total Phosphorus diffuse loads.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yutao Wang, Haojie Yin, Ziyi Wang, Yi Li, Pingping Wang, Longfei Wang
Summary: This study investigated the distribution and transformation of dissolved organic nitrogen (DON) in riverbed sediments impacted by effluent discharge. The authors found that the spectral characteristics of dissolved organic matter (DOM) in surface water and sediment porewater could be used to predict DON variations in riverbed sediments. Random forest and extreme gradient boosting machine learning methods were employed to provide accurate predictions of DON content and properties at different depths. These findings have important implications for wastewater discharge management and river health.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Saba Mirza Alipour, Kolbjorn Engeland, Joao Leal
Summary: This study assesses the uncertainty associated with 100-year flood maps under different scenarios using Monte Carlo simulations. The findings highlight the importance of employing probabilistic approaches for accurate and secure flood maps, with the selection of probability distribution being the primary source of uncertainty in precipitation.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Janine A. de Wit, Marjolein H. J. van Huijgevoort, Jos C. van Dam, Ge A. P. H. van den Eertwegh, Dion van Deijl, Coen J. Ritsema, Ruud P. Bartholomeus
Summary: The study focuses on the hydrological consequences of controlled drainage with subirrigation (CD-SI) on groundwater level, soil moisture content, and soil water potential. The simulations show that CD-SI can improve hydrological conditions for crop growth, but the success depends on subtle differences in geohydrologic characteristics.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Constantin Seidl, Sarah Ann Wheeler, Declan Page
Summary: Water availability and quality issues will become increasingly important in the future due to climate change impacts. Managed Aquifer Recharge (MAR) is an effective water management tool, but often overlooked. This study analyzes global MAR applications and identifies the key factors for success, providing valuable insights for future design and application.
JOURNAL OF HYDROLOGY
(2024)
