1-20-2010 Meeting to outline paper on Soil moisture response
Roger Bales, Jan Hopmans, Peter Hartsough, Matt Meadows
Timeline:
Week 1 – Meeting (all), Notes from Pits (MM), Soil texture figures (MM),Get
data from PSW [streamflow, precipitation, swe and or Mt rose] (RB)
Week 2 – Snow and soil data cleaned (XM), sensor accuracy (PH)
Week 3 – Soil water storage (MM, PH)
End of week 4 is February 20 – all outstanding items due, RB and JH write paper.
Summary Notes:
1)
-Porosity Measure/estimate for saprolite (TO)
-Depth to bedrock (TO)
-Notes from pits (MM)
-soil texture data summary by elevation and depth (MM)
-5 pits for bulk density, 1 at each site (MM)
Available at:
https://eng.ucmerced.edu/snsjho/files/Temporary_Exchange/Snow_Soil/Soil_bulk_density
2)
-Daily average data (XE)
-relate snow depth to SWE from Upper Met snow pillow (RB)
-melting rates
-soil water storage (MM, PH)
-soil moisture sensor accuracy (PH)
3)
-PET for reliable period (PH)
4)
-streamflow data (RB, CH)
-Precipitation data (RB, CH)
Additional Notes:
Need to get PSW data for 2008 and 2009 – streamflow, precipitation, SWE and/or
manual SWE. P300 and p303 streamflow is most important.
-for soil-snowmelt response look at correlation of UpMet to p303 and LowMet to
p300?
For Point 1 – soil grain size analysis by elevation and depth. Porosity of saprolite
(estimate). Depth to bedrock (estimate).
For Point 2 – calculate total water volume (storage) using daily time step. Graph daily
change in storage for 27 locations and all depths. Stratified volume for each pit: 0-20cm,
20-40cm, 40-70cm, 70-100cm.
Calculate melt rate (snow depth at each site and SWE from UpMet).
For Point 3 – Penmen-Monteith ET or PET from flux tower or CZTree.
2 part drying: Drainage+ET, ET
Other:
To apply measures of snow and soil moisture across the basin, we need to do a broader
survey to find out how well we sampled the variability.
Plan
Synoptic survey related to in situ measurements.
April 1st-ish: Requires 4 people for 2-3 days
-Snow distribution
May or June, and September: Requires 4 people for 1 week
-VWC (5 minutes per point)
-Tree Trunk Moisture (5-10 minutes per point)
-Initial Analysis:
Topographic/physiographic analysis of basin (XM)
How well do our sites fit the physiographic features?
-include all 50 sites
Determine if we are representative
-Regression tree model for snow distribution
-Elevation, vegetation, slope, aspect, wind?