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Publikasjoner

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2006

Sammendrag

The paper presents a new modified flashiness index which is based on hourly discharge measurements. This new index has been calculated for small agricultural catchments in Estonia and Norway respectively. A comparison has been carried out with results obtained from the Richards-Baker flashiness index, which is based on average daily discharge values. It is believed that an index based on hourly values and its comparison with the traditional index can reveal information about flow processes in the catchment. Such a comparison revealed large differences between the two index values for the Norwegian catchments, indicating large variations in discharge values over short periods or a "flashy" nature of runoff. These differences were not found for the Estonian catchments. At the same time large differences were found between the Norwegian and Estonian catchments. It is believed that the flashiness index and especially the comparison of the two different indexes, can be seen as an important tool in designing monitoring systems. In future work additional catchments will be included, both representing different sizes, land use and climate. The final goal is to be able to design a flashiness index on the basis of catchment characteristics such as land use, size, geo-hydrological settings and climatic conditions.