Water balance variability at the interstorm timescale

Water Resources Research - Tập 43 Số 5 - 2007
Nicholas J. Potter1, Lu Zhang1
1CSIRO Land and Water, Canberra, Australia

Tóm tắt

The translation of rainfall variability into variability in evapotranspiration, soil moisture, or runoff depends on many factors. Previously published results indicate that the sensitivity of evapotranspiration to rainfall at the interannual timescale generally increases as catchment aridity increases. This paper generalizes these results to the interstorm timescale by calculating the variance of interstorm evapotranspiration from a stochastic model of soil moisture balance. The derived analytical solution is compared to expressions for the variability of antecedent and poststorm soil moisture. This analysis shows that variability of interstorm evapotranspiration is low when average storm depth or average interstorm potential evapotranspiration is small relative to soil moisture capacity, as evapotranspiration is limited by the available water and energy. When water and energy inputs are larger, interstorm evapotranspiration variability is closely connected to variability in antecedent and poststorm soil moisture. The interstorm evapotranspiration deviation ratio is also calculated and compared to results from the interannual timescale. The effects of variable potential evapotranspiration and soil moisture controls on the rate of actual evapotranspiration are also considered.

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Water Resources Research

Tập 43 Số 5

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