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RiMARS: An automated river morphodynamics analysis method based on remote sensing multispectral datasets.

Abolfazl Jalali Shahrood1, Meseret Walle Menberu1, Hamid Darabi1

  • 1Water, Energy and Environmental Engineering Research Unit, University of Oulu, Oulu, Finland.

The Science of the Total Environment
|March 6, 2020
PubMed
Summary
This summary is machine-generated.

Remote Sensing (RiMARS) quantifies river morphodynamics, revealing dam impacts on the Kor River. Post-dam construction, river migration intensified, particularly downstream and in plains, altering sinuosity.

Keywords:
Environmental monitoringIranLandsatMNDWIMultispectral imageRiMARSRiver migrationSedimentsSinuosity index

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Area of Science:

  • River engineering and morphodynamics
  • Geospatial analysis and remote sensing applications

Background:

  • River morphology changes (erosion, sedimentation) impact river engineering and flow processes.
  • Monitoring river morphology is crucial for understanding and managing river systems.

Purpose of the Study:

  • To develop and validate a Remote Sensing-based approach for River Morphodynamics Analysis (RiMARS).
  • To assess the impact of Mollasadra dam construction on the Kor River's morphodynamics.
  • To quantify specific river morphology changes using developed indices.

Main Methods:

  • Utilized Landsat multispectral images from the USGS dataset.
  • Employed the Modified Normalized Difference Water Index (MNDWI) for river extraction.
  • Applied five key indices: Sinuosity Index (SI), Absolute Centerline Migration (ACM), Rate of Centerline Migration (RCM), River Linear Pattern (RLP), and Meander Migration Index (MMI).

Main Results:

  • Kor River centerline migration varied: 40 cm/year SW (pre-dam), 20 cm/year NE (early post-dam), 40 cm/year SW (later post-dam).
  • Morphological changes increased downstream and in plain areas compared to valley sections.
  • The 'straight' river class decreased by 5% pre-dam and 18% post-dam, indicating increased sinuosity.

Conclusions:

  • RiMARS effectively assesses dam construction impacts on river morphodynamics.
  • The Kor River experienced significant morphological alterations post-Mollasadra dam construction.
  • RiMARS is adaptable for monitoring other riverine changes, including water diversion impacts.