Nested Scales of Spatial and Temporal Variability of Soil Water Content Across a Semiarid Montane Catchment. Issue 10 (18th October 2018)

• Record Type: Journal Article
• Authors: Kaiser, Kendra E.; McGlynn, Brian L.
• Is Part Of: Water resources research. Volume 54:Issue 10(2018)
• Page Start: 7960
• Page End: 7980
• Publication Date: 2018-10-18
• Subjects: soil moisture -- scale -- topography; Hydrology -- Periodicals; 333.91
• DOI: 10.1029/2018WR022591
• Languages: English
• ISSNs: 0043-1397

Abstract

Abstract: Topographic redistribution of water has been represented by various terrain metrics (e.g., topographic wetness index, slope, and upslope accumulated area). This type of landscape characterization has promoted the use of terrain metrics to inform how spatial patterns of soil volumetric water content (VWC) influence streamflow, ecological processes, and associated nutrient fluxes. However, evaluation of what these static terrain metrics reflect has only been accomplished in a few catchments. Additionally, previous research suggests that relationships between topographic metrics and VWC could be different across catchments through time. Here we measured VWC from snowmelt through summer drydown across a semiarid montane catchment. Using a spatially nested sampling design, we assessed the spatiotemporal variability of VWC from plot (tens of meters) to landscape scales (hundreds of meters). Variance of riparian area VWC increased as the catchment dried, while upland variance decreased, highlighting the utility of delineating distinct landscape units when considering spatial variability of moisture, rather than calculating statistics across the landscape as a whole. In contrast to previous research, we found that the relationship between VWC and topographic metrics persisted through the dry catchment state, suggesting that patterns of topographic redistribution of water during snowmelt continued to influence dry season VWC despite variability in plot scale vertical processes (e.g., evapotranspiration). Future research should focus on resolving the relationship between catchment moisture state and VWC variability as a function of wetness state, seasonality, and magnitude of precipitation, topography, and soil depth. Key Points: Variability of VWC was higher at the plot scale than the landscape scale Variability of VWC was higher in the riparian area than in the uplands at both plot and landscape scales Landscape‐scale VWC remained correlated to terrain metrics throughout the seasonal drydown