Use of DIY Electrical Conductivity Probe for Low-Cost Conductivity-Temperature-Depth Measurements along the Duwamish River
Dr. Lauer will present his research at Seattle University on developing a low-cost electrical conductivity probe designed for estuarine deployment. When integrated with a pressure/temperature sensor, batteries, and a waterproof housing made from PVC pipe and a 3D-printed cap, the device functions as a conductivity-temperature-depth sensor capable of extended field use. Prototype data collected over multiple tidal cycles in the Duwamish River closely align with readings from a co-located commercial YSI-EX03 conductivity probe. When deployed across a constructed off-channel wetland in the Duwamish system, the sensors revealed significant spatial and temporal variability in electrical conductivity, emphasizing the role of such wetlands in creating unique temperature and salinity conditions that may benefit outmigrating juvenile salmon.
Dr. Lauer’s research focuses on geomorphic change in river systems over decadal and longer time scales. The work relies on remote sensing, computer simulations, and focused field measurements. Over the course of his career, Dr. Lauer has developed several computer applications intended to support this analysis. These include GIS-based tools for measuring channel migration and computer models for simulating geomorphic change in rivers. Dr. Lauer is also interested in the use of low-cost electronic sensors to support community-based hydrologic, geomorphic and ecological measurements.
Applications of Dr. Lauer’s research include evaluation of the sensitivity of river systems to changes in land use, climate, and water resources management (especially dams). The work also has applications in floodplain management and in the restoration/rehabilitation of degraded aquatic systems.
His research interests include:
Morphodynamic/sediment transport modeling
Remote-sensing/drone-based monitoring
Impacts of dams and reservoir operations on rivers
Hydrologic and hydraulic simulation modeling
Sediment budgeting
Floodplain management
River and stream restoration