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| Titel |
The evaluation of storm rainfall variability and its influence on runoff response at a catchment scale |
| VerfasserIn |
Vaclav David, Tereza Davidova |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107790
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| Publikation (Nr.) |
 EGU/EGU2015-7504.pdf |
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| Zusammenfassung |
| Storm rainfall events are usually very dynamic processes which are characterized by high
spatial and temporal variability. It can influence the catchment response to the event a lot in
terms of the shape and volume of response hydrographs. In this contribution, the variability of
selected rainfall events is presented. It is assessed in terms of total volumes of precipitation
which are an input to rainfall-runoff process.
As a source of precipitation information, data from precipitation gauging stations were used
which have one hour time step. Additionally, data originated from weather radar were
used to describe spatial variability in more detail. Measured reflectivity data were
transformed into the values of precipitation intensities which were compared to station
data to make a check on the reliability of radar originated data. The assessment
was carried out by the comparison of total precipitation to a catchment based on
different extent of source data. Precipitation totals were calculated from station data
using different methods including Thiessen polygons and different interpolation
techniques.
As a study area, the catchment of Blanice River was selected. This catchment is
located in Central Bohemia Region and smaller part extends beyond it to South
Bohemia Region. Its total area to the confluence to Sázava River is 543 km2. In
this catchment, agricultural lands predominates but the percentage of forests is
also not negligible. The area is in general hilly with important presence of steep
slopes.
The results of obtained by the analyses carried out show the high importance of the amount of
available precipitation data and their quality. Despite the fact that the variability of
precipitation can affect the distribution of runoff and consecutively the shape of
response hydrograph, it can affect also the accuracy and representativeness of the
information provided by point measurements of precipitation by gauges and by weather
radars.
Acknowledgement
The research presented in this contribution has been carried out within the research projects
NAZV KUS QJ1220233 “Assessment of former pond systems with aim to achieve
sustainable management of water and soil resources in the Czech Republic” and
SGS14/180/OHK1/3T/11 ”Rainfall-runoff, erosion and transport processes – experimental
research”. All the support is highly acknowledged. |
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