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Measurements of Soil Moisture, Infiltration, and Hydrophobicity in Yosemite National Park Across Differing Fire Histories


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Created: Jul 23, 2025 at 11:37 p.m. (UTC)
Last updated: Jul 25, 2025 at 6:54 p.m. (UTC)
Published date: Jul 25, 2025 at 6:54 p.m. (UTC)
DOI: 10.4211/hs.4022c4ec99224449b8c974657a332ac1
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Content types: CSV Content 
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Abstract

The impact of wildfire on soil properties is difficult to predict, partially due to a shortage of field observations. To help address this need, we have assembled a unique dataset of soil properties (moisture, infiltration rate, and water drop penetration time) at over 100 individual locations within Yosemite National Park. These locations cover a wide range of fire history, soil texture, vegetation cover, and topography. Measurements span May 2022 through July 2023, capturing both a dry year and a wet year. A subset of sites burned in late summer 2022, allowing for pre- and post-fire measurements. Each individual site was measured 1-3 separate times. Water drop penetration time was measured at the soil surface, 1cm, and 3cm depths. Infiltration rate was measured at the soil surface and at 3cm depth using a mini disk infiltrometer.

Subject Keywords

Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
Yosemite National Park
North Latitude
37.9200°
East Longitude
-119.4200°
South Latitude
37.4800°
West Longitude
-119.8700°

Temporal

Start Date:
End Date:

Content

README.txt

These files contains data on shallow soil properties measured across the western portion of Yosemite National Park in 2022 and 2023, as well as attributes of the measurement locations' vegetation, topography, and fire history. 
Measurements include water drop penetration time (0-3cm depth), infiltration rate (0-3cm depth), and volumetric water content (top 12-20cm of soil). 
These data are discussed in the report titled "Focused Condition Assessment (FCA) Assessing Landscape Vulnerability to Drought and Megafires using Linked Forest Condition-Water Models to Guide Resilience Planning"
by Gabrielle Boisrame, Chad Anderson, and Catherine Fong (https://irma.nps.gov/DataStore/Reference/Profile/2303410). The report and its appendices provide more details regarding how data were collected.

Contact: Gabrielle.Boisrame@dri.edu

Description of each file or folder:
VWC_Infiltration_Means.csv - Mean values within each site of measurements from 2022 and 2023 including water drop penetration time (WDPT; measured in seconds at the surface, 1cm depth, and 3cm depth), infiltration rate (which was measured at the surface and 3cm depth using a mini disk infiltrometer and converted from mL/min to cm/min by dividing by the bottom surface area), and shallow soil’s volumetric water content (VWC; a percentage measured using a Hydrosense II TDR probe). Additional columns include a 1 for "yes" and 0 for "no" indicating whether the site burned in the fall of 2022 and whether ash or snow were on the ground at the time of measurement.
DataforReport_20230309.csv - Measurements of forestry plots as well as soil moisture. Created by Chad Anderson.
YNP_Site_Attributes.csv - Attributes of each measurement site (coordinates, soil type, etc.) from the previous two files. 
Raw_Data - Folder containing raw data used to calculated the means in VWC_Infiltration_Means.csv, as well as field notes. These include measurements of infiltration at least every 30 seconds for up to 5 minutes, as well as 5 water drop penetration times at each site and depth.


Variable Descriptions for YNP_Site_Attributes datasheet:
FID - Unique identifier for each row in a datasheet
Site - Unique site name
Order_Orig - Original order in which data were entered	
Site_Orig - Older site names that may not have been consistent between datasets
Latitude - Site latitude in decimal degrees, WGS84
Longitude - Site longitude in decimal degrees, WGS84	
Elevation - Site elevation (m) extracted from a 10m resolution DEM (m)
Soil Type - Soil textural classification (loamy sand, clay loam, etc.)
TimesBurned - Number of mapped fires occuring at a given site between 
FireYear_To2022
RxFireYear - Most recent year with a prescribed wildfire
WildfireYrTo2021 - Most recent wildfire year up to 2021
Sev_MostRe - Most recent fire severity
Sev_Max - Maximum mapped fire severity
Sev_2022 - Severity of fires occuring in 2022
Slope_deg - Slope in degrees, calculated from DEM
Aspect - Downslope direction (0 is North)
can_height - Canopy height estimated from Lidar (m)
DEM_30mAgg - Elevation according to 30m resolution DEM
Curve10m - Topographic curvature calculated using 10m resolution DEM
Curve30m - Topographic curvature calculated using 30m resolution DEM
FlowAcc_10 - Total upslope area for flow accumulation, calculated using 10m resolution DEM (square meters)
FlowAcc_30 - Total upslope area for flow accumulation, calculated using 30m resolution DEM (square meters)	
MeadowRast - Meadow ID from mapped meadows
Soil Moisture - Indicates whether soil moisture was measured at this site
Infiltration - Indicates whether infiltration rate was measured at this site
Hydrophobicity - Indicates weather water drop penetration tests were performed at this site
Chad Forestry Plot - Indicates whether this site was also measured for forest structure by crew led by Chad Anderson
Notes	- Field notes
NDVI2016 - Normalized Difference Vegetation Index in year 2016, from satellite data
NDVI2021 - Normalized Difference Vegetation Index in year 2021, from satellite data	
ForestPctCover2019 - Percent of area at site covered by forest (vegetation > 2m high) calculated from 2019 lidar data
OpenPctCover2019 - Percent of area at site with vegetation < 0.5m high, calculated from 2019 lidar data	
ShrubPctCover2019 - Percent of area at site covered by shrub (vegetation < 2m high and > 0.5m high) calculated from 2019 lidar data
BasalArea  - Total basal area of trees

Related Resources

The content of this resource is similar to Boisrame G and Others. 2024. Assessing Landscape Vulnerability to Drought and Megafires using Linked Forest Condition-Water Models to Guide Resilience Planning. National Park Service. Yosemite National Park https://irma.nps.gov/DataStore/Reference/Profile/2303410

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
National Park Service NRCA Focused Condition Assessment (FCA) Program
U.S. National Science Foundation Critical Zone Collaborative Research Network 2011346

Contributors

People or Organizations that contributed technically, materially, financially, or provided general support for the creation of the resource's content but are not considered authors.

Name Organization Address Phone Author Identifiers
Michael Sasaki
Logan Sternberg
Liz Neudeck
Morgan Baker
Sarah Crumrine
Eyalee Lopez

How to Cite

Boisrame, G. F., C. Fong, C. Anderson (2025). Measurements of Soil Moisture, Infiltration, and Hydrophobicity in Yosemite National Park Across Differing Fire Histories, HydroShare, https://doi.org/10.4211/hs.4022c4ec99224449b8c974657a332ac1

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/
CC-BY

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