Hydrology of Walnut Gulch, Arizona

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Presentation transcript:

Hydrology of Walnut Gulch, Arizona Unearthing a First-Order Approximate Correlation Between Regional Hydrology and Extent of Vegetative Land Cover

Why Relate Hydrology and Vegetation? Energy Transfer in an Ecosystem begins with Primary Producers Plants need Water… Hydrologic Cycle dictates the sustainability of an Ecosystem

Methodology Select model ecosystem Select easily quantifiable hydrologic variables Construct an “Average Hydrologic Year” model Quantify Vegetative Land Cover Correlate the average hydrologic year with the vegetative land cover

Model Ecosystem Desert Walnut Gulch is VERY well documented RELATIVELY simple ecosystem Most vegetation low shrub Walnut Gulch is VERY well documented

http://www.tucson.ars.ag.gov/dap/DAPveg/default.htm

Hydrologic Variables Precipitation Atmospheric Moisture Soil Moisture Easy to Measure Easy to Average over watershed area Atmospheric Moisture Easy to Measure and Average over watershed Soil Moisture Difficult to Measure over any extent Highly Heterogeneous over watershed area

Annual Rainfall Data in 20-min Intervals

Annual Daily Cumulative Rainfall

10-yr Average Rainfall Year

Same Process for Atmospheric Moisture

Quantifying Vegetative Cover Fractional Absorbed Photosynthetically Active Radiation faPAR = (PAR-rPAR)/PAR rPAR = Reflected PAR PAR PAR rPAR rPAR

10-yr Average Daily Maximum faPAR

Correlation with Precipitation

Phase Shift

Conclusions and Future Work For desert environments, Vegetative Land Cover seems to be predicted by Precipitation Is this true for other, more hydrologically complex ecosystems? What causes the phase shift? Deeper exploration of Soil Moisture and Watershed Storage