ESTIMATING THE TENDENCY AND THE VARIABILITY OF THE RAINFALL AMOUNT
IN IALOMITA RIVER BASIN
AND THEIR INFLUENCE UPON THE LIQUID RUN-OFF
M. RETEGAN, M. BORCAN
ABSTRACT: Estimating the tendency and the variability of the rainfall amount in Ialomita river basin and their influence upon the liquid run-off. The paper focuses on an analysis of the spatial and temporal variability of rainfall amounts (meteorological parameter ) from Ialomita River Basin and also the influence that rainfall has upon the liquid run-off, expressed by the mean monthly discharges (hydrologic parameter) in a common period of time (1961-2007).
The study of the evolution of the above mentioned parameters has been based upon the data recorded from 6 weather and river stations which we considered to be representative for the studied area.
For these weather stations we have used, calculated and statistically interpreted the chronological data series of the mean monthly and annually rainfall amounts while for the river stations we have taken into account the mean monthly and yearly liquid discharges.
We have also tried to establish inter-connections between the two parameters, in order to demonstrate the tight link that is between them on both a time-space scale and in a regional context.
Any alteration of the liquid drainage is caused by alterations in the climatic system, mainly the rainfall patterns.
In order to identify the tendencies in the dynamics of the rainfall amounts and the mean liquid run-off and also to establish their statistic significance we have used the Mann-Kendall test (with the help of MAKENSIS programme).
Keywords: hydrological and climatic parameters, spatial and time tendencies, inter-connectivity, Ialomita river basin.