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1

Calibration of conceptual rainfall-runoff models by selected differential evolution and particle swarm optimization variants

Napiorkowski Jaroslaw J., Piotrowski Adam P., Karamuz Emilia, Senbeta Tesfaye B.

Acta Geophysica

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2023

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Vol. 71, no. 5

2325--2338

EN

The performance of conceptual catchment runoff models may highly depend on the specific choice of calibration methods made by the user. Particle Swarm Optimization (PSO) and Differential Evolution (DE) are two well-known families of Evolutionary Algorithms that are widely used for calibration of hydrological and environmental models. In the present paper, five DE and five PSO optimization algorithms are compared regarding calibration of two conceptual models, namely the Swedish HBV model (Hydrologiska Byrans Vattenavdelning model) and the French GR4J model (modèle du Génie Rural à 4 paramètres Journalier) of the Kamienna catchment runoff. This catchment is located in the middle part of Poland. The main goal of the study was to find out whether DE or PSO algorithms would be better suited for calibration of conceptual rainfall-runoff models. In general, four out of five DE algorithms perform better than four out of five PSO methods, at least for the calibration data. However, one DE algorithm constantly performs very poorly, while one PSO algorithm is among the best optimizers. Large differences are observed between results obtained for calibration and validation data sets. Differences between optimization algorithms are lower for the GR4J than for the HBV model, probably because GR4J has fewer parameters to optimize than HBV.

2

What can we learn from the projections of changes of flow patterns? Results from Polish case studies

Piniewski M., Meresa H. K., Romanowicz R., Osuch M, Szcześniak M., Kardel I., Okruszko T., Mezghani A., Kundzewicz Z. W.

Acta Geophysica

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2017

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Vol. 65, no. 4

809--827

EN

River flow projections for two future time horizons and RCP 8.5 scenario, generated by two projects (CHASE-PL and CHIHE) in the Polish-Norwegian Research Programme, were compared. The projects employed different hydrological models over different spatial domains. The semi-distributed, process-based, SWAT model was used in the CHASE-PL project for the entire Vistula and Odra basins area, whilst the lumped, conceptual, HBV model was used in the CHIHE project for eight Polish catchments, for which the comparison study was made. Climate projections in both studies originated from the common EURO-CORDEX dataset, but they were different, e.g. due to different bias correction approaches. Increases in mean annual and seasonal flows were projected in both studies, yet the magnitudes of changes were largely different, in particular for the lowland catchments in the far future. The HBV-based increases were significantly higher in the latter case than the SWAT-based increases in all seasons except winter. Uncertainty in projections is high and creates a problem for practitioners.

3

On the choice of calibration periods and objective functions: a practical guide to model parameter identification

Romanowicz R., Osuch M., Grabowiecka M.

Acta Geophysica

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2013

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Vol. 61, no. 6

1477--1503

EN

Despite the development of new measuring techniques, monitoring systems and advances in computer technology, rainfall-flow modelling is still a challenge. The reasons are multiple and fairly well known. They include the distributed, heterogeneous nature of the environmental variables affecting flow from the catchment. These are precipitation, evapotranspiration and in some seasons and catchments in Poland, snow melt also. This paper presents a review of work done on the calibration and validation of rainfall-runoff modelling, with a focus on the conceptual HBV model. We give a synthesis of the problems and propose a practical guide to the calibration and validation of rainfall-runoff models.

4

Hepatic liver diseases - methods for diagnosis and medical informatics for treatment support

Tsakona A., Paschali K., Tsolis D., Skapetis G.

Journal of Medical Informatics & Technologies

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2011

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Vol. 17

211--218

EN

Liver diseases and more specifically viral hepatitis are at the center of interest due to their global spreading, even in the most developed countries. The range of symptoms, the complications and the course of the disease have imposed the operation of liver centers at the outpatients' departments of hospitals, where the contribution of several specialized doctors the disease is diagnosed, prevented and treated. Many patients suffer from hepatitis without knowing it either because they manifest no symptoms or because the infection is not traced through the usual lab tests. This paper focuses on studying and proving how the systematic reading of the main liver diseases and the methods through which the doctor makes the diagnosis can help the study and analysis of a series of steps that have to be followed in order to treat the disease. Then, the use of a modern information system using Medical Informatics technologies is proposed so as both the task of diagnosis and the efforts to treat and overcome the problems related to the liver disease to be supported.

5

Specific Interactions of Cu2+ Ions with Enantiomers of Hepatitis B Virus Surface Antigen 140-146 Region

Świątek-Kozłowska J., Brasuń J., Maćkiewicz Z., Kupryszewski G.

Polish Journal of Chemistry

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2001

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Vol. 75, nr 6

813-822

EN

Potentiometric and spectroscopic studies on Cu(II) interactions with 140-146 fragment of the hepatitis B virus antigen have shown that the basic binding sites of metal ion are centered at a peptide N-terminal donor system and the side chain donor atoms are not competing in the metal ion coordination.