Spatial Distribution of Stream Conductivity and Temperature in a Snowdrift-Dominated Intermittent Headwater Network

Spatial patterns of water chemistry in stream networks can provide information about changing sources of water within a stream. These sources can be variable and difficult to predict in snowmelt-dominated watersheds with fractured bedrock. The aim of the project is to determine the sources of stream water by measuring the electrical conductivity and temperature of the stream at Reynolds Mountain East watershed in the Reynolds Creek Experimental Watershed and Critical Zone Observatory in southwestern Idaho. Electrical conductivity and temperature not only provide information about water sources, but the evolution of the spatial patterns may help us understand the pattern of stream drying in summer. Electrical conductivity and temperature was measured with a calibrated YSI Pro 30 every 100 m along the entire stream network. In June, the electrical conductivity ranged from 6.9 to 29.4 microsiemens per cm, the specific conductance ranged from 9.9 to 40.5 microsiemens per cm, and the temperature ranged from 8 degree Celsius to 27.2 degree Celsius at sites where there was sufficient water to make measurements. Springs are critical controls on the observed patterns of stream temperature and electrical conductivity, and stream drying patterns will be assessed as summer conditions proceed