Jornada Experimental Range (JER), Las Cruces, New Mexico:
Our group collaborates on the JER Long Term Ecological Research (LTER) site with New Mexico State University, USDA Agricultural Research Service and other universities to study the causes and consequences of woody plant encroachment and to address ecohydrological questions in desert rangelands. We have instrumented a small watershed consisting of a mixed Chihuahuan Desert shrubland, where we have on-going measurements and modeling studies of hydrological, meteorological and phenological processes. The instrument network consists of 20 soil moisture profiles around an eddy covariance tower and 15 soil moisture profiles arranged along hillslope transects. A network of rain gauges and channel runoff flumes is also deployed. A COSMOS soil moisture sensor with ancillary data has been installed. Results from the observational efforts are reported in Vivoni (2012), Templeton et al. (2014), Vivoni et al. (2014), Anderson and Vivoni (2016), Schreiner-McGraw et al. (2016), Mascaro and Vivoni (2016), and Schreiner-McGraw and Vivoni (2017).
Santa Rita Experimental Range (SRER), Green Valley, Arizona:
Our group collaborates on the SRER activities with the USDA Agricultural Research Service and the University of Arizona to study long-term vegetation changes and their impact on land surface processes including the active role of grazing practices. We have instrumented a small watershed located consisting of a Sonoran Desert mesquite savanna with an environmental sensor network and have obtained high-resolution imagery from aircraft platforms to study seasonal ecohydrological dynamics and the role of land surface conditions. The instrument network consists of 20 soil moisture profiles around an eddy covariance tower and 25 soil moisture profiles arranged along transects. A network of rain gauges and channel runoff flumes is also deployed a COSMOS soil moisture sensor with ancillary data has been installed. Results from the observational efforts are reported in Pierini et al. (2014), Vivoni et al. (2014), Anderson and Vivoni (2016), Schreiner-McGraw et al. (2016) and Mascaro and Vivoni (2016).
Rio Sonora Hydrologic Observatory (RSHO), Rayon, Sonora, Mexico:
Our group helps lead a large-scale hydrologic observatory in Sonora, Mexico with collaborators from the Universidad de Sonora and Instituto Tecnologico de Sonora with the goal of quantifying ecohydrological processes during the North American monsoon. The observatory includes a regional network of precipitation, soil moisture and evapotranspiration measurements. In addition, several field campaigns have been conducted in the basin (SMEX04, IRES06-08, UMB-WEST) with the goal of assessing the dynamics of summer season vegetation green-up. The 2017 GPS-Hydrometeorological Monsoon Network with collaborators from 10 institutions is the most recent effort in the study region. Results from the observational and modeling efforts are reported in Vivoni et al. (2007, 2010), Mendez-Barroso et al. (2009, 2014), Mendez-Barroso and Vivoni (2010), Mascaro and Vivoni (2010, 2012), Xiang et al. (2014, 2017, 2018), and Mascaro et al. (2015), among others.
Central Arizona Project (CAP-LTER), Phoenix, Arizona:
Our group collaborates on the CAP-LTER activities with other scientists at Arizona State University to study the water and energy interactions in urban Phoenix, in particular the role of irrigation on hydrological fluxes. We collaborate on the collection and analysis of hydrological and energy balance data at the North Desert Village, Indian Bend Wash and Maryvale sites, with the goal of conducting urban hydrological modeling of these neighborhoods using a number of different tools (soil water balance modeling, HEC-HMS, tRIBS) We are also involved in urban eddy covariance measurements using a mobile tower across a set of different urban land covers. Results from the modeling efforts are reported in Volo et al. (2014, 2015) and the observational work from the mobile towers is reported in Templeton et al. (2017).
Sevilleta National Wildlife Refuge (SNWR), Socorro, New Mexico:
Our group conducted a multiyear ecohydrological study in the Sevilleta National Wildlife Refuge at a headwater basin exhibiting stark contrasts in eccosystem, soil and terrain properties driven by aspect differences. The overall goal has been to quantify soil-water-climate-plant interactions on complex terrain to improve our understanding of the active role of plants in the co-evolution of soils and landscapes. An extensive instrument network consisting of 4 rain gauges, 8 runoff plots, 3 Bowen Ratio stations and micrometeorological measurements and 3 soil moisture and temperature transects. These measurements were complemented with a differential GPS survey and a LiDAR canopy height and bare-earth digital elevation models. Results from the field study and modeling efforts are reported in Gutierrez-Jurado et al. (2006, 2007, 2013a, 2013b, 2014).
Canyonlands Research Station (CRS), Moab, Utah:
Our group collaborates with scientists from the USGS Canyonlands Research Station to study the water and energy fluxes in the Colorado Plateau and the role played by biological soil crusts. We collaborate on data analysis stemming from long-term manipulative (warming and irrigation) experiments with the goal of developing hydrological models that account for the important ecohydrological role of biological soil crusts. Our modeling work is reported in Whitney et al. (2017).
CBBG Soil Erosion Facility, Mesa, Arizona:
Our group collaborates with the Center for Bio-Mediated and Bio-inspired Geotechnics (CBBG) at the Soil Erosion Facility on the ASU Polytechnic campus. Our efforts include the design, construction, and implementation of a large rainfall simulator and soil test beds to evaluate the effectiveness engineered erosion control products. To study the bimodal precipitation regime in the region, we will deploy a small network of disdrometers and weather stations at two of our established field sites (JER and SRER) and at the facility to gather discrete and general meteorological data over a multiyear period. Results from the study will be used in the assessment of the rainfall produced and applied to the surface by the simulator. In addition, the field sites will include sediment collection systems that will quantify surficial processes in relation to the energy applied by individual storm systems. Measurements collected from the three sites aim to describe the contribution by each rainfall type to regional land surface processes and landscape evolution.