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Comparison of selected methods of calculating baseflow in a small basin and evaluate influnence of baseflow to concentrations of phosphorus in total runoff.
ŠVARCOVÁ, Eliška
This thesis is focused on the methods of separation of baseflow and comparing of these metods. It is analyzing concentrations of total phosphorus in the total runoff and influence of baseflow to concentrations of phosphorus in total runoff. The studied area is subcatchment P52 in the catchment Kopaninský flow. Subcatchments P52 is small (64,93 hectares), drained agro-forestry catchment in Českomoravská vrchovina (Czech-Moravian highlands), with a large proportion of forest area (64% forest and 31% of arable land). Studied the period is hydrological period 2009 - 2011. To obtain the necessary results are used daily flow, daily concentrations, daily precipitation of rain gauge station Velký Rybník and monthly precipitation from rain gauge stations of the ČHMŮ (Czech Hydrometeorological Institute) in Humpolec. For the separation of the baseflow and comparison of methods were selected five methods: - method of digital filter according to Chapman (1999), - method UKIH designed by Institute of hydrology (1980), - method RDF proposed by LINE AND Hollick (1979), - method FUKIH proposed by AKOSY AT. AL. (2009) and - method of Kille (1970). All methods are simple to perform and not challenging to input data. When comparing methods, the main problem is that, the results obtained by different methods are very different. Another point of this work is to evaluate the concentrations of total phosphorus in the tatal runoff. Here is analyzed series of daily concentrations of total phosphorus and monthly and annual average concentrations. Low and high concentrations are compared with the values ??of precipitation and clinks are searched between these values. The main problem is that, the concentration of phosphorus are not dependent only on precipitation. The last point is solution of influnence of baseflow to the amount of total phosphorus in the runoff. Here is used the procedure which described BYSTŘICKÝ in its work (2012). There are determined values concentrations typical of baseflow, for direct runoff and total runoff. Groups of values ??are mutually tested and compared. The results show that, the baseflow is negligible contributor of phosphorus to the total runoff, but to achieve more accurate results would be needed to analyse a longer time period (eg 10 years) and compare the results with several different river basins.
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Methods of the baseflow separation and trends of phosphorus concentrations in this runoff
ŠVARCOVÁ, Eliška
The aim this bachelor thesis is to clarify the separation of streamflow at the individual components, describe their genesis, hydrological cycle and water balance. Furthermore, the thesis is specifically focused on the groundwater discharge component - baseflow . There are described some of the baseflow separation method. They are a method of empirical, methods based on graphical separation of streamflow hydrograph, methods that use a digital filter to separate the daily streamflow time series, methods that take into account of groundwater level or methods based on the analysis of natural isotopes and chemical substances and so on. There are many methods for the separation of the baseflow, and they are continously developing or are creating new and their results are often very different. There is also concentration of phosphorus and phosphates in groundwater and transfer of phosphorus by groundwater discharge into surface streams mentioned
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