Status: this preprint was under review for the journal HESS but the revision was not accepted.
Benchmark tests for separating n time components of runoff with one stable isotope tracer
Abstract. A validation of the recently introduced iterative extension of the standard two-component hydrograph separation method is presented. The data for testing this method are retrieved from a random rainfall generator and a rainfall-runoff model composed of linear reservoirs. The results show that it is possible to reconstruct the simulated event water response of a given random model input by applying the iterative separation model and using a single stable isotope tracer. The benchmark model also covers the partially delayed response of event water so that a situation can be simulated in which pre-event water is rapidly mobilized. It is demonstrated how mathematical constraints, such as an ill-conditioned linear equation system, may influence the separation of the event water response. In addition, it is discussed how the volume weighted separated event water response can serve as an estimator for a time-varying backward travel time distribution.
How to cite. Hoeg, S.: Benchmark tests for separating n time components of runoff with one stable isotope tracer, Hydrol. Earth Syst. Sci. Discuss. [preprint], https://doi.org/10.5194/hess-2021-213, 2021.
Received: 18 Apr 2021 – Discussion started: 10 May 2021
Stable isotopes can be used to analyse runoff generation processes in river basis. The current study validates a new method that is based on an iterative extension of the steady-state balance equations for tracer mass and volume flow. It is demonstrated how mathematical constraints may influence the applicability of the new method. In addition, it is discussed how the new method can be used for the analysis of water travel times in a river basin.
Stable isotopes can be used to analyse runoff generation processes in river basis. The current...