METHOD OF PALEOGEOGRAPHICAL ANALOGUES IN PALEOHYDROLOGICAL RECONSTRUCTIONSстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:One of the main problems of quantitative paleohydrology is a discrepancy between very high (even catastrophic) reconstructed discharges in the paleorivers and the results of the majority of precipitation reconstructions in the same territory. To resolve the problem it is necessary to find the closest recent analogue to the hydrological regime of a paleoriver and to calculate the main hydrological and climatic parameters of the former flow with the help of this analogue. This approach to paleohydrological reconstructions is the method of paleogeographical analogues based on two assumptions: (1) similar hydrological regimes were characteristic for the paleorivers in similar paleolandscapes; (2) the hydrological regime of a paleoriver within some paleolandscape would be similar to that of a present-day river in the same type of landscape. Quantitative paleohydrological reconstruction by paleogeographical analogy calculates a wide range of paleohydrological and paleoclimatic parameters, such as maximum discharge and its return period; mean maximum discharge; mean annual discharge; volume of the floodwave; winter and annual precipitations. A study of the Khoper River paleochannel with a discharge 7 times exceeding the modern one indicates that the paleochannel formation was caused mainly by periglacial conditions with continuous permafrost and very sparse vegetation, while the rainfall increase was only two-fold. The relative errors in calculations of hydrological parameters for the present-day rivers using their modern analogues are mainly within ±10%, and up to 40%. The relative errors of palaeohydrological reconstructions are probably closer to the latter value.