High-resolution digital surface characterization and hydrodynamic flow modeling of the Rio Chama in New Mexico

Authors: Rowan Converse*, University of New Mexico, Christopher Lippitt, Department of Geography and Environmental Studies, University of New Mexico, Mark Stone, Department of Civil Engineering, University of New Mexico
Topics: Remote Sensing, Environmental Science
Keywords: rivers, hydrology, DSM, photogrammetry
Session Type: Illustrated Paper
Day: 4/12/2018
Start / End Time: 8:00 AM / 9:40 AM
Room: Canal St. Corridor, Sheraton, 3rd Floor
Presentation File: No File Uploaded

Throughout the past eighty years, the Rio Chama, a major tributary of the Rio Grande in New Mexico, has been subject to significant disruption of historic hydrological flow regimes due to water use demands. In recent years, a multiagency management effort has been initiated to restore some measure of historic flow regimes in the 39.6 km congressionally-designated Wild and Scenic stretch through the Rio Chama Canyon Wilderness. We collaborated with managers at the US Army Corps of Engineers to collect approximately 15,870 fames of 10cm resolution multispectral imagery of the 82 km stretch of the river between El Vado Dam and Abiquiu Dam, which includes the Wild and Scenic area. Through structure-from-motion and multi-view stereo processing a 20cm resolution digital surface model (DSM) and 10cm orthomosaic were generated. This imagery will be used for a variety of research and management purposes, but here we present the preliminary results of two experiments: 1. the impact of oblique-angle imagery on vertical error rates in DSMs and 2. inundation estimation using hydrological flow models on 20cm DSMs of the channel.

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