1991 | OriginalPaper | Buchkapitel
Water Budget and Dissolved Load
verfasst von : Professor Dr. Hillert Ibbeken, Dr. Ruprecht Schleyer
Erschienen in: Source and Sediment
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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The mean effective precipitation in the 50-year period between 1921 and 1970 is 698 mm/a, the mean evaporation rate 48.6%. This results in an average annual runoff of 1278x 106 m3. The mean mineralization of the river waters is 322.6 ppm after the summer period and 221.4 ppm in late winter, 250 ppm being a reliable mean. About 47% of this dissolved load is regarded as being recycledor from atmospheric and anthropogenic input. The composition of the Calabrian river water corresponds fairly well to the worldwide mean of river water. Compared to the long-term (1 Ma) mean erosion rates of the 19 basins (206 mm/ka) the proportion of the present–day dissolved load is 16.3%; compared to mean actual effective erosion rates of 1527mm/ka consequently it is only 2.2%. Today the 19 basins release 319425 metric tons of dissolved load per year into the Ionian Sea, of which 169295 tons (53%) are geogenetic. This corresponds to a solid-rock cube of about 40 m side length.