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Site: East End (EE) aka US-Tw4

2013-11-25 - Present

The Twitchell East End Wetland is a newly constructed restored wetland on Twitchell Island, CA. This site and the surrounding region are part of the San Joaquin - Sacramento River Delta drained beginning in the 1850's and subsequently used for agriculture. The site was previously a corn field. The wetland was designed to have a mix of vegetated and open water channels and ponds (due to surface elevation differences). Flooding of the wetland was done gradually beginning in January, 2014. Berms wind throughout the wetland to allow vehicle access. Tule and Cattail plant material from a nearby wetland were spread along the berms immediately prior to flooding to facilitate plant establishment and stabilization of the berms from wind/water erosion. The tower was installed on November 25, 2013.

Ameriflux BADM Site Info

Last field site visit: more fieldnotes

2024-11-19 13:30:00

Regular data collection/cleaning, storms coming later this week

Latest data processing: more processing notes

2024-10-03

EE HMP60 problems for dates: 2023-05-01 - 2024-08-30

Processor of record: 2013-11-08 - Cove Sturtevant 2015-08-11 - Sara Knox 2016-02-05 - Elke Eichelmann 2019-03-21 - Camilo Rey-Sanchez 2020-03-25 - Alex Valach 2020-09-29 - Daphne Szutu 2021-01-21 - Camilo Rey-Sanchez 2024-05-06 - Joe Verfaillie 2024-10-03 - Daphne Szutu

Ameriflux Author: 20131125 - Cove Sturtevant 20131125 - Joseph Verfaillie 20131125 - Dennis Baldocchi 20150709 - Sara Knox 20160112 - Elke Eichelmann 20161200 - Daphne Szutu 20181101 - Camilo Rey Sanchez 20200101 - Alex Valach 20210720 - Robert Shortt

Data Digital Object Identifier (DOI)
FLUXNET-CH4: https://doi.org/10.18140/FLX/1669698
FLUXNET2015: https://doi.org/10.18140/FLX/1440111
FLUXNET: https://doi.org/10.17190/AMF/2204881
AmeriFlux: https://doi.org/10.17190/AMF/1246151

Equipment Locations more details

Data Streams: more data

Code	First Day	Last Day	Description
EE_cam	2013-11-26	-	Digital number data from the autocam imagery Phenocam archive
EE_flux	2013-11-25	-	30 minute averages of the 20Hz flux data
EE_met	2013-11-25	-
EE_minidot	2017-06-23	-	Dissolved oxygen from the minidot sensor from different locations
EE_processed	2013-11-25	-	Data loaded from the Level 1 processed data including fluxes and turbulence data
EE_processed3	2013-11-25	-	Gap filled and partitioned data from Level 3 processing files
EE_t1flux	2017-06-01	2017-10-19	Eddy flux from temporary tower T1 at the open water site at East End. Originally on the levee at 38.109522, -121.636071, but moved about 60m south to the location below after the first month.
EE_t1met	2017-06-01	2017-10-19	Micromet data from the East End Open Water Tower site (temporary tower for Summer 2017) recorded by a CR6 as 30min averages of 10sec samples. Originally on the levee at 38.109522, -121.636071, but moved about 60m south to the location below after the first month.
EE_t2flux	2017-06-14	2017-09-26	30min averages of the 20Hz flux data from the Temporary Tower in an area with a closed canopy of cattails
EE_t2met	2017-06-14	2017-09-26	Met data from Temporary tower 2 in and area with a largely closed canopy of cattails
EE_t3flux	2017-06-23	2017-10-04	30min averages of the 10Hz flux data from the East End Temporary Tower #3 on the first boardwalk south of the permanent tower.
EE_t3met	2017-06-23	2017-10-04	Met data from East End Temporary Tower 3 on the first boardwalk to the south of the permanent tower.

Metadata and Data Sets: more data

Id	Type	Site	Dates	Frequency	Title	Description
10	Leaf Level	EE, WP, SW	2017-07-12 - 2018-06-26	Handful of dates	LI-6400 measurements of Tule and Cattail	Leaf level measurements of tule and cattails including at least one 24 hour measurement period. More details needed here.
26	Lidar	BA, BC, EE, MB, SB, SW, TA, WP	2016-12-01 - 2017-03-07	Once	Delta-wide USGS Lidar flight	Winter time Lidar flight commissioned by the USGS and flown by Woolpert. Horizontal datum: NAD83 (NSRS2007) Epoch 2017.95, UTM Zone 10N, meters. Vertical datum: NAVD88, GEOID12B, US Survey Feet, Orthometric. Includes classified point cloud, features shape files, bare earth DEM, orthometric imagery (0.3-meter16-bit 4-band RGB-IR tiles in TIFF format with World Files). The entire Delta is covered by 8 points per m2, 0.5m DEM.
3	Lidar	BA, BC, WP, EP, EE, TA, TW, MB, SB, SW	2018-09-20	Once	NCALM Lidar Flight	Lidar flight data collection from Kyle Hemes NCAL project: Ecosystem Structure as a Driver of Climatic, Habitat, and Hydrological Services in Heterogeneous Restored Wetlands. Point clouds (*.las files), 1m resolution DEM and DSM (arcgis GridFloat files), visible imagery (*.tif files) of Sherman, Twitchel and Bouldin Islands. UTM Zone 10N, meters, NAD83(2011) epoch 2010.00 / NAVD88 (GEOID12B)
15	Report	EE	2015-07-19 - 2016-02-25	Once	Bad sonic U description and resolution	A broken wire in the sonic cable caused U to be record as noise rather than signal. It did not significantly affect the flux calculation but u-star, wind speed and wind direction were not recoverable. These variables were filled with regressions of TA data.
27	Soils	EE	2013-12-16 - 2013-12-16	Once	East End preflood soil sampling	107 samples for C/N, 20 samples for Fe, 88 samples for bulk density. Single depth, 107 spatial locations with high precision GPS. Higher density in EE tower footprint and two other possible portable tower locations.
25	Soils	SB, BC, EP, EE, BA, SW, MB	2018-08-27 - 2018-08-28	Once	Soil cores for C:N and microbial community	Soil samples were collected to be analyzed for soil moisture, bulk density, C:N, and microbial community. Generally at each site, two transects were sampled (T1 to the north, T2 south), starting near the tower and going to the west. Each transect had 5 sampling locations each (P1-P5), each location about 5m apart. At wetland locations (SW, MB, EE, EP, WP), soils were collected at 0-15cm depth. At agricultural locations (BA, BC, SB), soils were collected at 3 depths: 0-15cm, 15-30cm, and 30-60cm. For more information, see the field notes from each day. 2018-08-27 -Sherman Barn: The water table was around 50-60cm. -Bouldin Corn: Transects starting from the first corn rows running parallel away from the tower. Dry peat layer around 60 cm. -Bouldin Alfalfa: Transects starting roughly 5m from the tower. A smaller subsample was taken for microbial analysis. -East End: Transects starting 5-10m from the tower, going west/southwest through dense veg with the T2P4 and T2P5 taken from veg near the open water section. A smaller subsample was taken for microbial analysis. -East Pond: Transects starting about 7m from tower to the west (T1) and southwest (T2). (i.e. after the big open pond section by the solar panels). A smaller subsample was taken for microbial analysis. T2P5 was taken from the more uniformly vegetated area to the west. Other samples were mostly from fairly open water areas near clusters of veg. 2018-08-28 -Mayberry: Two transects (T1 in veg, T2 near the open water) each going northwest of the tower and took microbial subsamples from each core. -Sherman Wetland: We took two transects (T1 to the north, T2 south) going west from the tower starting where the water was about 20 cm deep and following the low vegetation.

Documents:
EastEndProjectInfo.pdf -
2015_EE_AmerifluxReport.pdf - Ameriflux intercomparison from May 29 - June 9, 2015 at East End
HMP RH and AirT Comparison 12-2017
Delta SW PAR Comparison 10-2016
Water Level sensor calibration with staff gauge
East End - NDVI (SRS, Apogee, Planet)
East End - Radiometer Calibration 2021
Picam FWB Rescaling - EE
EE Picam Intercomparison