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Related Experiment Video

Updated: Jun 9, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

Numerical simulation of landscape ecological river flow structure based on vegetation patch distribution and

Jingzhou Zhang^1,2, Shengtang Zhang³, Shufang Li^1,2

¹School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan, China.

Frontiers in Plant Science

|October 25, 2024

Summary

Vegetation fragmentation and coverage significantly alter river flow dynamics. Increased fragmentation and coverage reduce flow velocity and increase turbulence, impacting river wetland ecosystems.

Keywords:

landscape vegetation numerical simulation patch coverage patch fragmentation river wetland

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Area of Science:

Hydrology
Ecological Engineering
Computational Fluid Dynamics

Background:

Natural watersheds are disrupted by vegetation and human activities, affecting river wetland ecosystems.
Understanding vegetation patch distribution and fragmentation is crucial for ecological flow characteristics.

Purpose of the Study:

To numerically simulate and analyze the landscape ecological flow characteristics of vegetation patch distribution and fragmentation.
To investigate the impact of vegetation coverage and fragmentation on river flow and turbulence.

Main Methods:

Utilized a three-dimensional Reynolds stress turbulence model in ANSYS Fluent software.
Simulated flow characteristics of discontinuous rigid vegetation patches in a river channel.
Validated the model with indoor open-channel flume experiments.

Main Results:

Streamwise velocity is lower in vegetated areas, with differences increasing with coverage and fragmentation.
Reynolds stress patterns vary with submersion state: bottom in non-submerged, canopy top in submerged.
Turbulent kinetic energy is higher in vegetated areas, with complex correlations to coverage and fragmentation.

Conclusions:

Vegetation patch characteristics significantly influence river flow and turbulence.
Flow dynamics are highly dependent on vegetation submersion, coverage, and fragmentation degree.
These findings are vital for managing river wetland ecosystems and ecological flows.