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Methods of calculating the spatial distribution of precipitation and differences in rainfall totals in a small catchment area
 VÁVRA, Miroslav
This thesis is focused on methods of calculating the spatial distribution of precipitation and differences in rainfall totals in a small catchment area. The main aim is to find methods which enable transfer of spot measurements of precipitation to spatially distributed estimation and consequently comparison of results of these methods and evaluation of their differences and accuracy. For better understanding of this problematic, precipitation and its characteristics, origin and types are described. Factors which precipitation influence are also listed further in the text. The main part of this thesis is description of methods of spatial precipitation distribution and their application in a small catchment area. Methods are listed from the most common ones (Arithmetic mean method, Thiessen polygon method, Isohyetal method) to those most recent and least applied (Hypsometric method, Inverse distance weighted method, Kriging). Thiessen polygon method and Isohyetal method are described in detail and joined by figure for better understanding. Different methods of spatial precipitation distribution calculations (Thiessen polygon method, Isohyetal method, Arithmetic mean method) were compared on one catchment area with quite surprising results. The calculated values of rainfall totals in the catchment area differed only slightly using different calculation methods. It was also stated that not even with large number of rain gages in the catchment area we aren?t able to achieve 100% calculation accuracy.
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