Study Number: 

1023

Project Title:

Gradient soil moisture measurements.

Investigator(s):

James M. Vose  E-Mail | Tel. 828.524.2128 x 114 | Biographical Sketch
Affiliated Institution(s): USDA Forest Service  
Address: Coweeta Hydrologic Laboratory
3160 Coweeta Lab Road
Otto, North Carolina 28763
Study Category: Terrestrial
Project Type: Coweeta Core Research
Study Period:

07/1991 - 03/1999
Date Type:

Type 1
Funding Source(s):

National Science Foundation, DEB-9632854 (Text Version) and DEB-0218001 (Text Version) to Coweeta LTER.

Abstract: See Methods/Experimental Design, below.
Location(s), Described: Watershed 18 and Watershed 27.

 See Project Summary Sheet 1048 and Terrestrial Gradient Sites: Characteristics (photographs) for detailed information about plot locations and physical descriptions, respectively.
Site Number X Coordinate Y Coordinate
118-Upper 39.3 50.5
118-Lower 27.8 32.6
218- Upper 50.7 50
218- Lower 52.5 32.8
318- Upper 41.2 32.2
318- Lower 46 16.1
427-Upper 40.7 40.6
427-Lower 46.9 26.6
527- Upper 41.7 60.3
527- Lower 49 48
Location(s), Download GPS: ArcView Shape Files (shp.):  UTM, NAD83, Zone 17  |  Lat/Lon
Location(s), Online Map(s): USGS Topographic-based Maps of Research Sites
(Printable for fieldwork)
Methods/Experimental Design: Soil Moisture via Time Domain Reflectometry (TDR) was sampled at approximately 1 month intervals using the Tektronix 1502B cable tester. TDR waveguides of 30 cm length were installed parallel to the slope at depths of 0.05 and 0.20 m, and were located in close proximity to the thermistor probes.

Formulae for Calculations:
E = (READ/L) where READ = apparent length of probe
L = actual length of probe = 0.30m
%MOIST = ( (-0.053) + (0.0292xE) - (0.00055xE^2) + (4.3x10^-6 x E^3) * 100 ), where ^ = to the power of


 Resources for students about terms used in this study:
Time Domain Reflectometry, p.16-19 - Source: 2001 Coweeta Field Technician Procedure Manual
Sampling Frequency: Biweekly / monthly
Data Columns: Year - Year
Month - Month
Day - Day
Time - Hour
Site - Site number (see Locations, Described above)
Read5 - Reading at 5cm depth with Tektronix 1502B cable tester
Read20 - Percent soil moisture calculated from Read5
Moist5 - Reading at 20cm depth with Tektronix 1502B cable tester
Moist20 - Percent soil moisture calculated from Read20

Missing Data Codes: . (Period)
Publications:

Representative publications and research data from investigator(s) of this study:
Vose - Global search
Data Restrictions: Users must adhere to the Coweeta LTER Data Policy.
Metadata: EML Format (XML Schema) | Information about EML
Data Downloads: Microsoft® Excel (.xls)
 Text Comma Delimited (.csv)
 DBase (.dbf)