PRELIMINARY EVALUATION ON THE RATIO BETWEEN THE SURFACE AND UNDERGROUND RIVER SUPPLY IN EASTERN ROMANIA
MINEA I., MIHU-PINTILIE A,. IOSUB MARINA, HAPCIUC OANA
ABSTRACT. Preliminary evaluation on the ratio between the surface and underground river supply in Eastern Romania. In the last decades, the classic methodology for evaluating the base flow index (BFI), as the characteristic medium hydrograph, was replaced by new specialized algorithms, as HYSEP, PART, BFLOW, Eckhardt ș.a. The goal of this study is to determine the base flow index (BFI) within four hydrometric stations located on few rivers characterized by different phisical-geographic conditions from Eastern Romania (Lepșa – Lepșa river, Cuejdiu – Cuejdiu river, Băcești – Bârlad river and Tg. Frumos – Bhlueț river). The calculations were made both by using the classical methodology, and by a new algorithm proposed by Eckhardt in 2005 and 2008. Through comparing results, it is proved that the new determination methods for the underground intake reveal in a more accurate manner the climatic and geologic relations of the analyzed rivers (BFI - Lepșa 35%; Cuejdiu 45%; Băcești >50%; Târgu Frumos >50%). As a result, the higher underground intake for the rivers flow modifies the method of calculation of hydrological balances, and thus, changes in water resources management.
Keywords: surface and underground supply, base flow index (BFI), Eckhardt method, Eastern Romania.