Abstract
A regularized joint inverse procedure is presented and used to estimate the magnitude of extreme rainfall events in ungauged coastal river basins of El Salvador: Paz, Jiboa, Grande de San Miguel, and Goascoran. Since streamflow measurements reflect temporal and spatial rainfall information, peak-flow discharge is hypothesized to represent a similarity measure suitable for regionalization. To test this hypothesis, peak-flow discharge values determined from streamflow recurrence information (10-year, 25-year, and 100-year) collected outside the study basins are used to develop regional (country-wide) regression equations. Peak-flow discharge derived from these equations together with preferred spatial parameter relations as soft prior information are used to constrain the simultaneous calibration of 20 tributary basin models. The nonlinear range of uncertainty in estimated parameter values (1 curve number and 3 recurrent rainfall amounts for each model) is determined using an inverse calibration-constrained Monte Carlo approach. Cumulative probability distributions for rainfall amounts indicate differences among basins for a given return period and an increase in magnitude and range among basins with increasing return interval. Comparison of the estimated median rainfall amounts for all return periods were reasonable but larger (3.2–26%) than rainfall estimates computed using the frequency-duration (traditional) approach and individual rain gauge data. The observed 25-year recurrence rainfall amount at La Hachadura in the Paz River basin during Hurricane Mitch (1998) is similar in value to, but outside and slightly less than, the estimated rainfall confidence limits. The similarity in joint inverse and traditionally computed rainfall events, however, suggests that the rainfall observation may likely be due to under-catch and not model bias.
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Abbreviations
- A :
-
Drainage area in km2
- CN:
-
Runoff curve number for a tributary basin
- d r :
-
Vector of preferred regional dissimilarity between tributary basin parameter values
- d a :
-
Vector of actual regional dissimilarity between tributary basin parameter values
- h :
-
Vector (n-dimensional) of observation values (recurrent peak-flow discharge values determined externally for areas regression equations)
- h 0 :
-
Current model outputs
- j :
-
Regularization observations
- j 0 :
-
Initial set of regularization constraints (soft prior information)
- I :
-
Identity matrix
- I a :
-
Initial abstraction
- Lt :
-
Lag time
- L :
-
Hydraulic length of tributary basin
- L :
-
Operator indicating regularization observations acting on parameter set p
- M :
-
Operator that maps parameter space to the space of observations
- M(p):
-
Vector of simulated recurrent tributary basin peak-flow discharge and rainfall values determined using a rainfall–runoff model
- P :
-
Vector of parameter (rainfall–runoff curve numbers) and boundary condition (recurrent rainfall amounts) values being estimated
- p 0 :
-
Current parameter values
- p − p 0 :
-
Parameter upgrade vector
- p j :
-
Rainfall–runoff parameter value in tributary basin j
- p k :
-
Rainfall–runoff parameter value in tributary basin k
- pri :
-
Prior information
- P :
-
Rainfall in mm
- q um :
-
Unit peak discharge (m3/s/km2/mm)
- Q :
-
Diagonal weight matrix used in the measurement objective function
- R :
-
Depth of runoff in mm
- S :
-
Maximum potential difference between rainfall and runoff (tributary basin retention) in mm
- S :
-
Relative weight matrix used in the regularization objective function
- w ri :
-
Regularization weights
- X :
-
Jacobian matrix of the operator M
- X T :
-
Transpose of matrix X
- Y :
-
Tributary basin slope
- Z :
-
Jacobian matrix of the operator L
- β2 :
-
Regularization weight factor
- λ I :
-
A diagonal matrix (Marquardt lambda) added to enhance inverse stability
- Φm :
-
The model-to-measurement misfit described by a least-squares measurement objective function
- Φr :
-
The model-to-regularization misfit described by a least-squares regularization objective function
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Acknowledgments
This work was carried out under the Earthquake Reconstruction Program administered by U.S. Agency for International Development, as part of technical assistance following the catastrophic earthquakes of January and February 2001 in El Salvador.
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Friedel, M.J. Regularized joint inverse estimation of extreme rainfall amounts in ungauged coastal basins of El Salvador. Nat Hazards 46, 15–34 (2008). https://doi.org/10.1007/s11069-007-9179-1
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DOI: https://doi.org/10.1007/s11069-007-9179-1