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Hydrologic analysis of Keritis basin-Determination of hydraulic structure design flow

Maragkaki Antonia

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Summary

This dissertation is about Keritis-Therisos river basin which is located in the prefecture of Chania on the island of Crete. It is a typical Mediterranean river basin with complex hydrogeology. It has a surface area of 210 Km2 and it provides the drinking and irrigation water of the most populated area of the prefecture of Chania. The dissertation examines the basic principles of hydrological modeling as well as the structure of the SWAT model (Soil Water Assessment Tool) in combination with the karst model of two reservoir (Nikolaidis et.al. 2013). These models were used for the updating of the modeling of Meskla and Agyia (Kalamionas, Platanos, Kolympa) springs . Data are available for Meskla springs (1978-2005), Agyia (1978-1985) and for Kalamiona (1971-1979). In addition, there are data for 2012 and 2014 hydrologic years for Keritis river and 2019-2020 for Agia springs. These data were used for the fine tuning of the calibration of the model for the area. At the same time, the necessary information regarding the meteorological, geological and hydrological data of the study area also are available. Statistical indicators showed that the hydrologic modeling of Keritis river basin was acceptable. The hindcasting of the hydrological flows for the past 50 years allowed the use of statistical analysis (Gumbel and Log Pearson) for the determination of the 50 year return flood over a 24 hour period. Finally, the rainfall analysis of 2019 identified the relationship between peak hourly flow to flood average flow. This information was used to determine the design flood flow with 50 year return period and hourly duration for the design of hydraulic and flood retention structures ( 291.9 m3s ).

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