I have a daily flow data at the outlet of my basin. From that data, how can i estimate base flow parameters?I am currently using constant monthly method and i am using a trial and error approach..but i want to explore other possibilities of baseflow methods such as recession baseflow for which i would beed recession constant, initial discharge and ratio to peak.. How can i estimate these parameters?
Dear Kushal,
This is a trial and error approach. Until you get a good match between observed and simulated discharges you can change the parameters.
Best
Miyuru
Dear Kashal,
You can estimate HEC-HMS parameters in two different ways:
1. the manual calibration: As Miyuru said, you can manually change the parameters to find the optimal one which provides a good match between observation and simulated discharges. However, in the case of high number of parameters, this approach is not straightforward.
2. Automatic calibration: another method for estimating HEC-HMS model parameters is linking an external optimization method to your model to do the automatic calibration. Although there is an automatic calibration procedure embedded in the HEC-HMS models, previous studies showed that this is not reliable and practical.
The following two papers are an example of automatic calibration of HEC-HMS models with sufficient explanation:
1. Darbandsari, P., & Coulibaly, P. (2020). Inter-comparison of lumped hydrological models in data-scarce watersheds using different precipitation forcing data sets: Case study of Northern Ontario, Canada. Journal of Hydrology: Regional Studies, 31, 100730.
2. Dariane, A. B., Javadianzadeh, M. M., & James, L. D. (2016). Developing an efficient auto-calibration algorithm for HEC-HMS program. Water resources management, 30(6), 1923-1937.
Best
Pedram
Once you have calibrated and validated the hydrological model against the streamflow values at the basin outlet, you can get the baseflow parameters as the actual ones. Another way is to apply the methods of baseflow separation
There are many ways of estimating baseflow from measured flow data. Note that all of them are estimates; there is no way of knowing if they are right. So, one has to use the flow data to estimate baseflow parameters and then feed them into a hydrological model, HEC-HMS or some other model.
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