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Modelling of hydrologic and geochemical response of Keritis River basin using the SWAT model

Aldakos Theodoros

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URI: http://purl.tuc.gr/dl/dias/E60E01B6-9E01-447B-8881-B234E74E21E7
Year 2014
Type of Item Diploma Work
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Summary

The study area of this Diploma Thesis is Keritis river basin, located in Chania prefecture, on the island of Crete and has an area of 180 km2. This area has been thoroughly studied in the past, due to the importance of water quantities discharged from existing sources as well as due to the agricultural and livestock uses. In the present work, hydrologic and geochemical data were collected in the field (surface flow of Keritis) and analyzed at the Laboratory of Hydrogeochemical Engineering and Remediation of Soil, Technical University of Crete. Additionally, monitoring of Keritis river was done through the collection an analysis of data from river troll station for 2012 – 2013 hydrologic year. In this study, a combined model is used for modeling the hydrology and geochemistry (nitrates) of the watershed. This model combines the SWAT model (Soil Water Assessment Tool) in GIS environment and the karst model of two reservoirs (Nikolaidis et al., 2013). Firstly, there is information about the study area, with respect to hydrology, geology, climatic data, land use and soils that consist the river basin. Moreover, input data is presented which is necessary for the set up and function of the combined model (meteorological and flow data, hydraulic abstractions, nitrates and data concerning agriculture as well as livestock). Another section of the Thesis contains results of the modeling of hydrologic and geochemistry of river basin. Hydrologic modeling was conducted using data from Meskla and Agia springs and from the station in the main river. The calibration period was from 1978-1985 for Agia and Meskla springs and verification from 2000-2005 for Meskla springs and 2012-1013 for the main station in the river. These dates were determined based on data availability. The hydrologic simulation of the basin was successful.The effectiveness of model was tested with the use of comparative graphs and statistical indexes (RMSE, RSR, NSE, PBIAS). In conclusion, the combined model (SWAT model and karst model of shallow and deep aquifer) is proved to be a reliable scientific tool for hydrologic and geochemical modeling of Keritis river basin.

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