Bathymetric Change Detection from the Air

Authors: James T. Dietrich*, University of Northern Iowa, Amy S. Woodget, Loughborough University
Topics: Geomorphology, Water Resources and Hydrology, Remote Sensing
Keywords: river bathymetry, change detection, Structure from Motion, SfM
Session Type: Paper
Day: 4/6/2019
Start / End Time: 3:05 PM / 4:45 PM
Room: Hoover, Marriott, Mezzanine Level
Presentation File: No File Uploaded


Quantifying the rates of geomorphic change is critical for a range of applications within river science and management, including monitoring the evolution of river restoration and assessing the impacts of flow modifications and engineering structures on habitat availability. The tools available for monitoring small river systems at high spatial resolutions are growing with the adoption/availability of airborne/terrestrial laser scanning data and Structure from Motion (SfM)-based photogrammetry. Most studies have focused on using these tools for monitoring the above water portions of streams (banks, bars, and floodplains). However, monitoring the bathymetry of these smaller streams is still limited to traditional survey techniques and these methods do not provide spatially continuous data and can overlook important changes. Recently, we have advanced our capabilities for spatially continuous surveying of bathymetry in clear water streams using a refraction correction method for SfM data. In this research, we investigate several methodological improvements for the bathymetric SfM process and assess the geomorphic change changes in the lowland River Teme in Herefordshire, UK.

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