Understanding Groundwater And Surface Waterexchange Processes Along A Controlled Stream Using Thermal Remote Sensing And in Situ Measurements

Varlı, Dilge
Yılmaz, Koray Kamil
Effective management of water resources requires understanding and quantification of interaction between groundwater and surface water bodies. Moreover, the exchange processes have recently received increasing attention due to important influences on biogeochemical and ecological status of watersheds. In this study we investigated the exchange processes between surface water and groundwater along Kirmir stream - a controlled stream nearby Kizilcahamam, Ankara, Turkey. At the first stage, potential stream reaches where the exchange processes could occur were pinpointed using geological and geomorphological information. Then, thermal remote sensing was utilized to further narrow down the potential locations in which interaction could occur at a smaller scale. Nested piezometers were installed at identified locations to observe the variations in vertical hydraulic gradient over time. Differential discharge measurements were performed to understand the gains and losses along the stream reach. Streambed temperature measurements were taken at two different depths for a period of time using temperature loggers to calculate the vertical fluid fluxes through the streambed at various locations. Basic water quality field parameters (temperature, electrical conductivity, total dissolved solid amount, dissolved oxygen, pH and oxidation - reduction potential) were measured along the stream reach, from surface water and the piezometers as wells as from the nearby springs and wells. Chloride mass balance was performed to find the contribution of groundwater and chloride concentrations were associated with the geology of the area. This hierarchical, multi-scale methodology provided an efficient and effective way to determine the locations and the direction of groundwater and surface water exchange processes within the study area.
Citation Formats
D. Varlı and K. K. Yılmaz, “Understanding Groundwater And Surface Waterexchange Processes Along A Controlled Stream Using Thermal Remote Sensing And in Situ Measurements,” presented at the American Geophysical Union Fall Meeting 2016 (12 - 16 Aralık 2016), San-Francisco, Kostarika, 2016, Accessed: 00, 2021. [Online]. Available: https://agu.confex.com/agu/fm16/meetingapp.cgi/Paper/175931.