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Conservation of Mass in Moving, Nondeforming Control Volume01:14

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Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
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Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Design Example: Design of an Irrigation Channel01:27

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Trapezoidal channels are widely used in irrigation systems due to their cost-effectiveness and efficiency in conveying water. Trapezoidal channels feature a flat bottom and sloping sides, making them stable and easier to construct compared to other shapes. The bottom width and side slope ratio are determined based on the required flow capacity and site conditions. The side slope is kept gentle for unlined channels to prevent soil erosion.Hydraulic parameters in channel design include the flow...
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Gradually Varying Flow01:29

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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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Estimating Virus Production Rates in Aquatic Systems
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River plastic transport and storage budget.

Louise J Schreyers1, Tim H M van Emmerik1, Fredrik Huthoff2

  • 1Hydrology and Environmental Hydraulics, Wageningen University and Research, Wageningen, The Netherlands.

Water Research
|June 14, 2024
PubMed
Summary

Rivers transport significant plastic pollution, with suspended plastics dominating item transport but not mass. Floodplains store the vast majority of riverine plastic mass, highlighting the need for compartment-wide monitoring.

Keywords:
FluvialMacroplasticsMicroplasticsPollutantsSinksWater quality

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Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Hydrology

Background:

  • Rivers are key pathways for land-based plastic pollution to reach oceans.
  • Limited understanding exists regarding plastic pollution distribution across river compartments (surface, water column, banks, floodplains).

Purpose of the Study:

  • To quantify the contributions of different river compartments to plastic transport and storage.
  • To develop a harmonized methodology for assessing riverine plastic pollution.

Main Methods:

  • Identified relevant transport processes for each river compartment.
  • Estimated transport and storage using harmonized data on surface, suspended, and floodplain plastics.
  • Applied the approach to macroplastic (≥2.5 cm) in two Dutch river sections.

Main Results:

  • Suspended plastics accounted for over 96% of item transport in river channels.
  • Suspended plastics contributed 30%-37% to mass transport, with surface plastics being heavier.
  • Floodplains stored 98% of the total plastic mass, while river channels stored only 2%.

Conclusions:

  • A harmonized, replicable methodology was developed for quantifying plastic transport and storage across river compartments.
  • Findings underscore the necessity of systematic monitoring across all river compartments for a complete understanding of riverine plastic pollution.