A detailed study of stream and catchment geomorphology and temperature was completed for this first order stream in Lee, NH. A tributary of the Lamprey River, the watershed drains a large portion of Lee Center and several subdivisions, but also contains large areas of forest and fields.
Hyporheic exchange and groundwater discharge was determined to be the greatest contributor to stream temperature moderation and maintenance. Coincidence of streambed circulation at steps and log dams and cool groundwater discharge from spring fed tributaries combined to create hyporheic “hot spots” (which moderate stream temperature year-round). Study findings provide an important contribution to ecohydrology and stream temperature dynamics research and emphasize the importance of stream morphology and hyporheic exchange within a stream catchment.
Instream and riparian ecosystems with moderate temperature ranges provide habitable conditions for organisms and reduce stress caused by acute temperature changes. However, patchy stream temperature conditions also promote ecosystem diversity. This stream system was found to contain a moderate stream temperature regime overall and a morphology that promotes biodiversity due to the range of cool and somewhat warmer conditions within and along the stream.
Services Provided
- Hydrology, Geomorphology, & Restoration
- Hydrogeology and Source Water Protection
- Groundwater and Surface Water Quality Sampling