INTERACTION BETWEEN GROUNDWATER AND SURFACE WATER: QUANTIFYING THE RELATIONSHIP BETWEEN GROUNDWATER DISCHARGE AND WATER TEMPERATURE IN ONEIDA LAKE, NEW YORK. IS WATER TEMPERATURE AN APPROPRIATE PROXY FOR MEASURING GROUNDWATER DISCHARGE?
We found a clear relationship between ground-water discharge and lakebed temperature. Lakebed temperatures increased with distance from the shoreline, and ground-water discharge rates measured by seepage meters decreased with distance from the shoreline. Our results agree with earlier ground water - lake studies, which found that in homogeneous sediments, ground-water discharge is focused near the shore.
Temperature, when used as a proxy for groundwater discharge, is more time-efficient, cheaper and less environmentally destructive than more traditional methods, such as the use of seepage meters and mini-piezometers. We found a qualitative relationship between groundwater discharge and temperature (low temperature indicates high discharge during the late summer study); however it may be time and site-specific. Additionally, we found no clear quantitative relationship between temperature and discharge. We conclude that temperature is an indicator of discharge yet it may not be a quantitative proxy. Additional research is required to further develop the mathematical relationship between temperature and groundwater discharge.