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HIGH FLOWS DETERMINATION AT UNGAUGED RIVER STRETCHES USING REGIONALIZATION APPROACH (EXAMPLE MESTA WATERSHED)
Abstract
The lack of direct measurements (the most accurate way to determine characteristic high flows) has posed the need to look for other hydrological methods that are sufficiently reliable. The regionalization is an indirect hydrological approach for specific high flow determination used at ungauged river stretches. Usually the hydro-technical constructions or other important economic activities connected to the water use are the main reason necessitating the study of characteristic high water on rivers. For the purposes of sizing facilities, as well as for flood control, this information is absolutely necessary. The application of the regionalization approach for a specific catchment is not a standard procedure but a strictly individual investigation based on statistical processing of existing hydrological measurements at hydrometric stations on a larger territory and transfer of information to ungauged river sections. Statistical processing and especially the creation of regional correlations between measured flows and some catchment characteristics (area, altitude…etc.) is associated with a good knowledge of the watershed, the conditions of formation of high waves in the area, as well as a preliminary assessment of the quality of used hydrological information. The responsibility of the research is enhanced if it is carried out for the construction of a high-class facility the destruction of which can lead to great damages. The Mesta Watershed has been chosen as an example for application of this methodological approach. There are numerous river stretches along the mainstream or the tributaries without hydrological observations. The present study is based on time series of annual maximum flows, measured at the gauging stations of the National Institute of Meteorology and Hydrology on the Bulgarian part of Mesta catchment. The obtained regional links and design high flows, in the frame of this investigation, have very strong correlation, are stable, representative and can be used successfully in practice. The limited volume of the material allows partial presentation of the examples developed for the Mesta watershed.
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References4
Iordanov and all, Geography of Bulgaria, Edition of Bulgarian Academy of Sciences, Bulgaria, 2002
Е.М.Wilson, Engineering hydrology- Forth Edition, MACMILAN PRES LTD, London, 198-276 Engineering hydrology- Forth Edition, MACMILAN PRES LTD, London, 198-276, 1990
S. Gerasimov, Methods and analyses of the maximum river flow calculations, Monograph, Edition of the National Institute of Meteorology and Hydrology, Sofia, 1988
Zhang, Y., Chiew, F.H.S., Relative merits of different methods for runoff predictions in ungauged catchments. Water Resour. Res., 45(7): W07412, DOI: 10.1029/2008wr007504, China, 2009
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