A time-series analysis framework for the flood-wave method to estimate model parameters

“The flood-wave method is implemented within the
framework of time-series analysis to estimate aquifer parameters
for use in a groundwater model. The resulting extended
flood-wave method is applicable to situations where groundwater
fluctuations are affected significantly by time-varying
precipitation and evaporation. Response functions for timeseries
analysis are generated with an analytic groundwater
model describing stream–aquifer interaction. Analytical response
functions play the same role as the well function in a
pumping test, which is to translate observed head variations
into groundwater model parameters by means of a parsimonious
model equation. An important difference as compared to
the traditional flood-wave method and pumping tests is that
aquifer parameters are inferred from the combined effects of
precipitation, evaporation, and stream stage fluctuations.
Naturally occurring fluctuations are separated in contributions
from different stresses. The proposed method is illustrated
with data collected near a lowland river in the Netherlands.
Special emphasis is put on the interpretation of the streambed
resistance. The resistance of the streambed is the result of
stream-line contraction instead of a semi-pervious streambed,
which is concluded through comparison with the head loss
calculated with an analytical two-dimensional cross-section
model.”
(Citaat: Obergfell, C., Bakker, M., Maas, K. A time-series analysis framework for the flood-wave method to estimate model parameters – Hydrogeology Journal 24(2016)7, p.1807-1819 – Open Access)