This data release contains (1) geotechnical reports describing colluvium strength and grain size distribution, (2) hydrological monitoring data (rainfall and soil volumetric water content), and (3) shapefiles of mapped landslides, all from the Eagle Creek Burn Area in the Columbia River Gorge, Oregon.
The geotechnical reports describe test results from two consolidated drained direct shear tests (ASTM D3080) to characterize soil shear strength ("S1_30_45_cm_direct_shear.pdf” and “S2_30_45_cm_direct_shear.pdf”) and from one sieve and hydrometer analysis (ASTM D422) to characterize grain size distribution (“S2_0_15_cm_grain_size_distribution.pdf”). Direct shear tests were performed on 15 cm soil cores, spanning 30-45 cm depth, sampled at two adjacent monitoring stations: S1 (45.5678888889, -122.1334611111) and S2 (45.5677861111, -122.1337277778). Soil cores were collected using an auger and split spoon soil sampler. The sieve and hydrometer tests were performed on a near-surface (0-15 cm depth) soil sample from station S2, collected in a resealable bag.
The hydrological monitoring data ("S2_rainfall_VWC_20221028_to_20230213.csv”) include a time history of rainfall and volumetric water content, spanning from 10/28/2022 to 2/13/2023 at 5-minute resolution, from monitoring station S2, which was installed in October 2022. The field “DateTime” contains a string of date and time in the format “mm/dd/yyyy hh:mm”, the field “Rain_mm” contains rainfall in units mm, and the field “VWC_75cm” contains volumetric water content in units m3/m3 from a 75-cm deep soil moisture sensor.
The mapped landslide shapefiles in folder “landslide_mapping.zip” represent shallow landslide source areas, assumed to have failed during storms in 1996 ("landslide_initiation_1996.shp”) and 2021 (“landslide_initiation_2021.shp”). The field “area” in both shapefiles is the area of the polygon in m2. Landslide mapping was performed by comparing pre- and post-event orthoimages rendered in Google Earth.
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