The Influenced flow Regimes
G. PANDI
ABSTRACT. The influenced flow regimes. The presence and
activities of humanity influences the uniform environmental system, and in this
context, the rivers water resources. In concordance with this, the natural
runoff regime suffers bigger and deeper changes. The nature of these changes
depending on the type and degree of water uses. The multitude of the use cause
different types of influence, whit different quantitative aspects. In the same
time, the influences have qualitative connotations, too, regarding to the
modifications of the yearly water volume runoff. So the natural runoff regime is
modified. After analyzing the distribution laws of the monthly runoff, there
have been differenced four types of influenced runoff regimes. In the excess
type the influenced runoff is bigger than the natural, continuously in the whole
year. The deficient type is characterized by inverse rapports like the first
type, in the whole year. In the sinusoidal type, the influenced runoff is
smaller than the natural in the period when the water is retained in the lake
reservoirs, and in the depletion period the situation inverts. At the irregular
type the ratio between influenced and natural runoff is changeable in a random
meaner monthly. The recognition of the influenced regime and the grade of
influence are necessary in the evaluation and analysis of the usable
hydrological river resources, in the flood defence activities, in the complex
scheme of the hydrographic basins, in the environment design and so on.
Keywords. -natural regime, influenced regime, water use, influence degree,
regime types