Published in Scientific Papers. Series E. Land Reclamation, Earth Observation & Surveying, Environmental Engineering, Vol. IV
Written by Gabriel MINEA, Mary-Jeanne ADLER, Gabriela MOROSANU, Gianina NECULAU
The aim of this study is to investigate the role of land use in the dynamics of the water resources on a plot scale (waterbalance plot), following natural spring rainfalls and land use (grassland vs. bare soil). The study was primarily basedon hydrometeorological data (e.g.: rainfall depths, rainfall intensities and flows), measured in the spring (IV-V) of 2014at Voinesti Experimental Basin, part of the National Institute of Hydrology and Water Management - Romania. Thewater balance plots are situated at an altitude of 500 m a.s.l. in the Curvature Subcarpathians and have the followingcharacteristics: 300 sq m area; type of soil: eutricambisol; average slope of 13% and N-S orientation; land use: a plot“grassland”(P1) and another plot “bare soil”(P2).During the analyzed period, rainfall events, corroborated with previous conditions of soil humidity, have beenquantitatively reflected in the flow parameters (depths, discharges) thus: the processed soil plot created heterogeneousconditions for the runoff surface, such as microdepressions, and thus flow rates have been reduced compared to thoserecorded on the grass plot; The interception of vegetation, in cases of previous humidity (last 3 days) caused by smalldepths (e.g. 0.6 and 19 mm), has been low and highlighted by high rates of overland flow (0.144 l/s on vs. 0.092 l/s onP1), and when antecedent conditions are marked by rainfalls, the interception has been reduced and thus the volumesof overland flows were amplified (4996 l on P2 vs. 2800 l on P1); soil infiltration rates were elevated in cases ofprevious rains and low when previous conditions were dry for both land use types; this is also confirmed by thepartition of average flows volumes: 15% overland flow, 27% subsurface flow, 58% base flow.
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