How does sediment size affect river turbidity detected by remote sensing imagery?
Best insight from top research papers
Sediment size has a significant effect on river turbidity detected by remote sensing imagery. The sensitivity of remote-sensing reflectance to water turbidity is inversely related to suspended sediment concentration (SSC) . In particular, the presence of sand in the sediment mixture linearly reduces the turbidity signal . Different particle sizes, such as medium sand, fine sand, and very fine sand, show different optical responses, with fines being more sensitive than coarser sands . The effect of particle size on the observed remote-sensing reflectance depends on the wavelengths and the range of SSC . Therefore, when using remote sensing imagery to estimate river turbidity, it is important to consider the sediment size and its impact on the turbidity signal .
Answers from top 4 papers
More filters
| Papers (4) | Insight |
|---|---|
28 Mar 2022 | The provided paper does not directly address the influence of sediment size on river turbidity detected by remote sensing imagery. |
68 Citations | The provided paper does not discuss the effect of sediment size on river turbidity detected by remote sensing imagery. |
| The provided paper does not directly address how sediment size affects river turbidity detected by remote sensing imagery. | |
| The provided paper does not specifically discuss how sediment size affects river turbidity detected by remote sensing imagery. |
Related Questions
How to use turbidity to evaluate total suspended concentration in lab?5 answersTurbidity can be utilized to estimate total suspended sediment concentration in laboratory settings by establishing reliable relationships between the two parameters. Various methods such as turbidimetry and nephelometry can be employed to measure turbidity, which is indicative of light scattering and absorption in a medium. Research has shown that there is a correlation between turbidity and total suspended solids (TSS), with power functions often representing the trends well across different soils. Additionally, studies have explored the use of turbidity measurements to approximate TSS concentration in water pipes, highlighting the impact of factors like particle origin, flushing method, and sampling time on the turbidity/TSS ratio. Laboratory experiments have also demonstrated a 1:1 correlation between turbidity and TSS for certain soil fractions, suggesting the potential for using turbidity to estimate sediment concentrations, particularly for fine soil fractions.
How can remote sensing studies on determining sediment concentration be categorized?5 answersRemote sensing studies on determining sediment concentration can be categorized into three main types based on the algorithms used: empirical, semi-analytical, and analytical algorithms. These algorithms utilize different approaches to quantify suspended sediment concentration in water bodies. Additionally, the data sources for establishing these inversion models can be divided into measured spectral data and satellite data, including marine satellite data, Landsat data, and meteorological satellite data. Furthermore, remote sensing techniques in the visible range of the electromagnetic spectrum have been utilized to analyze the relative concentration of sediments in water bodies, providing a cost-effective alternative to traditional field methods. By leveraging satellite imagery and reflectance data, these studies enable the estimation of suspended sediment concentration spatially and temporally, aiding in assessing water quality parameters efficiently.
How to measure water sediment using remote sensing?5 answersWater sediment can be measured using remote sensing techniques, such as satellite imagery. By analyzing the reflectance of specific bands in the visible spectrum, suspended sediment concentration (SSC) can be estimated spatially and temporally. Optical cameras and RGB indices have also been utilized to describe water turbidity, providing insights into sediment levels. Satellite remote sensing, particularly with instruments like the Ocean and Land Color Instrument (OLCI) on Sentinel-3A, offers a viable method for retrieving SSC in estuarine areas, despite challenges like atmospheric correction uncertainties. Additionally, remote sensing-based approaches, like the at-a-station hydraulic geometry (AHG) power-law method and machine learning algorithms, have shown promise in estimating water discharge and sediment concentration in rivers, enhancing monitoring capabilities. These methods leverage satellite data to improve understanding and monitoring of sediment dynamics in water bodies.
How does geological affect river turbidity?5 answersGeological factors have a significant impact on river turbidity. Turbidity is influenced by factors such as lithological features, land cover, and the geometric characteristics of the river network. The presence of particles of silt, clay, and fine sand in the water contributes to turbidity. Different geological settings and land use types can affect the dynamics of sediment transport and the relationship between turbidity and suspended sediment concentrations. In northern regions, the existence of thermokarst lakes and the topography of the site can also influence sediment transport and turbidity variations in rivers. Understanding the relations between turbidity, sediment characteristics (such as particle size and density), and organic content can help in developing global dependencies for turbidity measurements. Overall, geological factors play a crucial role in shaping river turbidity and sediment transport processes.
Why do estuaries have high turbidity?4 answersEstuaries have high turbidity due to various factors. Turbidity is influenced by sediment transport and resuspension, which can be caused by multiple biogeochemical processes and sedimentation from rivers. Human activities and natural changes can also contribute to changes in estuarine water quality, including turbidity. Additionally, the presence of mud pools on the estuary bed and time-varying river discharge can affect the trapping of fine sediment and the formation of estuarine turbidity maxima (ETMs). In the availability-limited state, the SSC is limited by the amount of erodible sediment at the bed, while in the erosion-limited state, an abundant amount of sediment at the bed leads to sediment pickup at the maximum possible rate. These factors can result in the movement and distribution of sediment, leading to high turbidity in estuaries.
How does turbidity affect aquatic animals?5 answersTurbidity, or the cloudiness of water, has significant effects on aquatic animals. Increased turbidity can alter movement behavior, decrease foraging efficiency, and reduce collective behavior in fish species. It can also affect predator-prey interactions, with higher turbidity leading to reduced prey capture rates for visually oriented predators. Turbidity reduces the distance that animals can detect food, predators, and conspecifics, leading to risk-averse behavior and potential impacts on wild prey populations. Additionally, turbidity can affect the use of visual cues in fish, resulting in changes in social interaction and association preferences. These findings highlight the importance of understanding the impacts of turbidity on aquatic animals, especially in the context of habitat degradation and alteration caused by human activities.