Parameterizing the Yellow River Delta tidal creek morphology using automated extraction from remote sensing images
Zhaoning Gong1, Kuinan Mou1, Qiwei Wang2
1College of Resources, Environment and Tourism, Capital Normal University, Beijing 100048, China; Key laboratory of 3D Information Acquisition and Application of Ministry, Beijing 100048, China; Beijing Key Laboratory of Resources Environment and GIS, Beijing 100048, China; Beijing Laboratory of Water Resources Security, Beijing 10048, China.
The Science of the Total Environment
|January 22, 2021
Summary
A new algorithm accurately maps tidal creek morphometry, revealing how seawater erosion and vegetation influence their evolution. This aids in coastal tidal flat management and monitoring.
Area of Science:
- Coastal geomorphology
- Hydrodynamics
- Environmental monitoring
Background:
- Tidal creeks are crucial components of intertidal zones, regulating deposition and hydrodynamics.
- Understanding tidal creek morphometry is vital for coastal tidal flat development and management.
- Existing methods face challenges with accuracy, efficiency, and handling complex creek networks.
Purpose of the Study:
- To develop a comprehensive, automated system for extracting large-scale tidal creek morphometry characteristics.
- To improve the accuracy of node classification and grading in tidal creek networks.
- To analyze the influence of seawater intrusion and vegetation on tidal creek network evolution.
Main Methods:
- Development of an advanced algorithm for automated extraction of tidal creek morphometry.
- Improved node classification and grading to mitigate interference from island-shaped creeks.
- Quantification of morphometric characteristics: order, number, length, sinuosity, bifurcation rate, and density.
Main Results:
- The algorithm achieved 92.22% accuracy in tidal creek node classification and error-free ordering/flow direction definition for nearly a thousand creeks.
- Tidal creek order and number increase spatially (north-south, west-east), with length correlating to order.
- Seawater erosion significantly impacts creek sinuosity, bifurcation, and density, with changes slowing due to catchment area shrinkage.
Conclusions:
- Tidal creek morphology is primarily influenced by vegetation distribution and seawater erosion.
- Seawater erosion drives creek evolution, but its rate is moderated by catchment area dynamics.
- Most tidal creeks in the Yellow River estuary have reached equilibrium, with slowing bifurcation rates indicating a shift to local etching.
Keywords:
Morphology characteristicsSpatial differentiationThe Yellow River DeltaTidal creek extractionMore Related Videos
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