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Papers
61,005 resultsShowing papers similar to Modeling Spatial Patterns of Dissolved Oxygen and the Impact Mechanisms in a Cascade River
ClearEarly Warning and Joint Regulation of Water Quantity and Quality in the Daqing River Basin
Researchers developed a dynamic water quantity and quality simulation model for the Daqing River Basin in China, finding that reducing ammonia-nitrogen emissions by 38–85% and maintaining minimum base flows could bring the river's water quality up to standard under extreme flood scenarios.
Climatic and anthropogenic regulation of carbon transport and transformation in a karst river-reservoir system
Researchers analyzed dissolved inorganic carbon along a cascade of seven dam reservoirs in a karst river system in southwest China over one hydrological year, finding that cascading dams collectively exert a stronger effect on carbon cycling than single dams, with water temperature and hydraulic retention time jointly controlling how much carbon is retained or transformed.
Simulation of Water Quality in a River Network with Time-Varying Lateral Inflows and Pollutants
Researchers improved a mathematical model for non-point source pollutant transport in urban river networks by converting the lateral outflow term in the Saint-Venant equations from a constant to a time-varying flow process with linear increase and exponential decay. Applied to Maozhou River Basin, the improved model achieved NSE values of 0.805 and 0.851 for hydrodynamic and water quality simulation, respectively.
Water quality's responses to water energy variability of the Yangtze River
Researchers used MIKE21 hydrodynamic-water quality models for the Yangtze River to study how river energy influences pollutant-carrying capacity and water quality. The models achieved average relative errors of 5.17-8.37%, quantifying how flow variability affects the distribution of water quality parameters.
Effect of cascade damming on microplastics transport in rivers: A large-scale investigation in Wujiang River, Southwest China
Researchers investigated how cascade damming on the Wujiang River in China affects microplastic transport, finding that dams intercept microplastics and reduce their downstream flux, with midstream areas showing the highest concentrations.
Assessing dissolved oxygen dynamics in Pasig River, Philippines: A HEC-RAS modeling approach during the COVID-19 pandemic
This is not about microplastics — it is a water quality study modeling dissolved oxygen levels in the Pasig River, Philippines, using HEC-RAS hydraulic modeling to compare conditions before and during the COVID-19 pandemic.
Suspended sediment dynamics and the related environmental risk assessment in a sensitive water area
Researchers used 2D hydrodynamic modeling to show that suspended sediment loads in China's Nanji Mountain Nature Reserve vary strongly with seasonal river input from the Ganjiang, and that wet-season sediment pulses carry microplastic and nutrient fluxes up to ten times higher than dry season — elevating ecological risk precisely when waterbird populations are lower.
Basin-Scale Pollution Loads Analyzed Based on Coupled Empirical Models and Numerical Models
This study used a combination of field measurements and computer models to quantify pollutant loads from different sources across a Chinese river basin. Better tools for tracking pollution sources at basin scale can support efforts to reduce microplastic and other contaminant inputs to waterways.
A Numerical Framework for Pollutant Transport in Shallow‐Water Flows: Application to the Niger River in Bamako
Researchers developed a numerical framework coupling shallow-water hydrodynamic equations with an advection-diffusion model to simulate pollutant transport in river systems, validating the approach with application to the Niger River in Bamako.
Sakawa River plume in Sagami Bay, Japan under weak wind condition: numerical simulation of coastal ocean dynamics and in situ observations for validation
Researchers developed a numerical coastal ocean dynamics model for the Sakawa River plume in Sagami Bay, Japan, validating it against in situ thermohaline measurements and deriving regression equations to estimate river plume length from water levels and discharge rates.
Distribution and characteristics of microplastics in the Yulin River, China: Role of environmental and spatial factors
Microplastic pollution in the Yulin River in China was highest in tributary bays and declined downstream, with anthropogenic activity being a strong predictor of abundance. The backwater effect of the nearby Three Gorges Reservoir increased microplastic concentrations at the river's estuary, showing how reservoir management shapes plastic distribution.
Improving Water Quality in a Sea Bay by Connecting Rivers on Both Sides of a Harbor
Researchers used a validated Mike 21 numerical hydrodynamic model to evaluate the effects of connecting two rivers on opposite sides of harbor embankments in Laizhou Bay, China, to improve nearshore water quality. Results showed that the connection increased tidal current speeds across more than 53% of the study area and boosted net particle transport distances by up to 39.89 km per month.
Modeling Microplastic and Solute Transport in Vegetated Flows
Researchers developed a hydrodynamic model for microplastic transport over submerged vegetation canopies, finding that microplastics exhibited higher longitudinal dispersion than dissolved solutes and that canopy height significantly influenced mixing and transport processes.
The Three Gorges Dam alters the spatial distribution and flux of microplastics in the Yangtze River
Researchers mapped how the Three Gorges Dam on the Yangtze River alters the distribution and flow of microplastic pollution. They found that the reservoir acts as a significant trap for microplastics, accumulating them in sediment and the fluctuation zone along its banks, while reducing the downstream flux. The study suggests that large dams fundamentally change how microplastic pollution moves through major river systems.
Quantifying the Impact of Changes in Sinuosity on River Ecosystems
Not directly relevant to microplastics — this study models hydrodynamic changes in a Beijing river under varying degrees of channel sinuosity and assesses habitat suitability for common carp.
Hydrological Connectivity Patterns and Their Eco-hydrological Implications in the Dasha River, China
This study used graph theory and isotope tracing with weekly eco-hydrological monitoring to assess hydrological connectivity and ecological impacts in the heavily modified Dasha River, Shenzhen, providing a methodological framework for urban river management.
Challenges in Simulating Pollutant Behavior in Watercourses with Diverse Ecological and Structural Features
Despite its title referencing pollutant behavior in watercourses, this paper studies computational fluid dynamics modeling of how different types of pollutants disperse in rivers with complex physical features — not microplastic pollution specifically. It examines how liquid pollutants and solid particles spread through waterways with bridges, vegetation zones, and side channels, and is only tangentially relevant to microplastics.
Influence of Channel Regulating Structures on the Transportation and Dissipation of Supersaturated Total Dissolved Gas
This study examined how river engineering structures affect the downstream spread of gas supersaturation from dam discharge, which can cause 'gas bubble disease' and fish mortality. This hydraulic engineering study is not directly related to microplastic research.
The role of biofilm and hydrodynamics on the fate of microplastic particles in rivers: an experimental study
Researchers conducted experimental flume studies to investigate how biofilm formation and hydrodynamic conditions jointly govern microplastic particle fate in rivers, examining why some urbanized and industrialized river reaches show no significant upstream-to-downstream increase in microplastic concentration despite theoretical inputs.
Study on the Impact of the Coastline Changes on Hydrodynamics in Xiangshan Bay
Not relevant to microplastics — this Chinese hydrodynamics study uses ocean modeling to examine how decades of coastline modification in Xiangshan Bay have altered tidal currents and water flow patterns.
Substantial burial of terrestrial microplastics in the Three Gorges Reservoir, China
Researchers found substantial burial of terrestrial microplastics in Three Gorges Reservoir sediments, suggesting that large hydropower dams act as significant traps that intercept microplastic transport from rivers to the ocean, with implications for the Yangtze River's plastic output.
How hydrodynamic conditions dominate the microplastic footprint in the largest freshwater lake in China
Researchers collected microplastics from surface water across China's Poyang Lake and used hydrodynamic flow data to model how three dominant particle types—PE fibers, PP fragments, and PE films—migrate under different flow conditions. Hydrodynamic conditions were the dominant control on microplastic spatial distribution, with still-water zones accumulating the highest concentrations.
The concept, approach, and future research of hydrological connectivity and its assessment at multiscales
Researchers reviewed the concept of hydrological connectivity — the water-mediated transfer of matter and energy across landscapes — examining how dam construction, land management, and climate factors alter it, and identifying numerical modeling and connectivity indices as the most useful tools for its assessment across spatial scales.
From particle tracking modelling to species impact forecasting: a framework for microplastic exposure risk quantification in the largest freshwater lake of China
Using a hydrodynamic model coupled with particle tracking, researchers simulated microplastic transport, distribution, and impact zones in Poyang Lake, China's largest freshwater lake. The model revealed seasonal variation in MP accumulation hotspots driven by water level fluctuations, and predicted high-risk zones for aquatic organisms.