CHARACTERIZING THE TEMPERATURE AND HYDROLOGICAL DYNAMICS OF THE MĀNOA STREAM
Date
2024
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Abstract
Climate change has far-reaching consequences for hydrogeological dynamics, including shifts in stream temperatures. Urbanization and land use change further alter stream conditions, with stormwater runoff from impervious surfaces contributing to rapid temperature fluctuations and removal of riparian vegetation leading to smaller temperature buffering. Additionally, changing precipitation patterns will affect surface runoff and groundwater contributions changing stream dynamics. The purpose of this study was to investigate which principal hydrological parameters influence the temperature of the Mānoa Stream. Principal variables measured included baseflow (quantified via discharge data, FINIFLUX radon modeling, stable isotopes, groundwater contaminant testing, and nitrogen), hyporheic flow (analyzed via electrical resistivity), precipitation (quantified via stable isotopes and direct collection records), canopy cover (observed as percent of coverage), stream bed/urbanization impact (quantified as natural versus constructed reaches and local population density), and season/date/time. Results indicate that baseflow contributions to the stream vary by season and stream reach but are not strongly linked to temperature changes. Precipitation may influence the isotopic composition of the stream heavily and temporarily and was primarily found to moderate stream temperature toward the stream average temperature. Canopy coverage, urbanization impact, and season/time correlate the most with recorded temperature trends, indicating the combination of these three parameters inflicting the strongest influence on stream temperature. These results suggest that Honolulu urbanization will have a strong control on the health of the stream in the future, likely to be exacerbated by climate change impacts.
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Geochemistry, Hydrologic sciences, Climate change, Climate Change, Geochemical Tracers, Hydrology, Isotopes, Mānoa Stream, Temperature
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100 pages
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