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abstract 867

Simulation of Daily Runoff for the Salaca River Basin

Author(s): Elga Apsite, Anda Bakute
Faculty of Geographical and Earth Sciences, University of Latvia, Raina bulv. 19, Riga LV-1586, Latvia, e-mail: elga.apsite@lu.lv

Keyword(s): simulation of runoff, hydrological model, the Salaca River, Latvia

Article:

Poster:

Session: Poster session 1

AbstractThe Salaca River basin locates in

North-Easter part of Latvia. The total drainage area of the river basin is 3421 km2 of which the Burtnieks Lake

watershed occupies 62%. In Latvia the conceptual model METQ for the simulation of hydrological processes of the

different size of river basins has been applied over ten years. The model METQ has many modifications. In this

paper the analysis of mathematic modelling results on the basis of the last version METQ2007BDOPT for simulation

of daily runoff and water level for the Salaca River basin are presented.
In this study the Salaca River basin is

divided in six sub-basins. To consider the runoff heterogeneity in runoff processes the sub-basins are divided in

hydrological response units characterised by a relative homogeneity with respect to the most important parameters,

which includes slope, vegetation and soil characteristics. Input data for the model are daily meteorological data. The

model has calibrated and verified from 1961 to 2006. As one of the results the river discharge at eleven points and

water level of the lake for the 46-year period has been simulated. To analyses the results of model calibration a

statistical criterion R2 and a correlation coefficient r are used. Good coincidence between the observed and

simulated daily runoff has obtained. The analysis of optimized parameters of the METQ2007BDOPT shows that the

numerical values of the model parameters obtained for each sub-basin have reflected the geomorphologic conditions

of studied drainage sub-basins.

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Simulation of Daily Runoff for the Salaca River Basin