Published on 23 January 2017
The article describes the changes in runoff of the river Baksan over many years in mountains (Teghenekly village, Tyrnyauz city ) and piedmont areas (Zayukovo village) of the watershed. Runoff modules of the river Baskan in three altitudinal zones were calculated. Local dependence of runoff from the drainage basin of medium height was determined. Data series of average annual runoff statistics (expectation (m (x)), dispersion (D (x)), standard deviation (Ϭ (x)) and coefficient of variation (Cv)) were calculated. For the selection of representative settlement periods (including the full cycles of water availability) difference-integral curves of the coefficients of modular drain were developed in the chosen posts. Over the entire period of observation in the integral curve of annual runoff in the mountainous part of the river Baksan, Teghenekly village and Tyrnyauz city there have been allocated two complete cycles with average runoff, which is equal to the long-time average annual. The first cycle lasted 20 years, from 1970 to 1989. The second - 17 years, from 1990 to 2007. During the observation period (19 years) in the foothill part of the river Baksan - village of Zayukovo there was a complete cycle from 1993 to 2008. On the background of prolonged cycles, shorter dry and wet periods were observed. Reduced water content of the river Baksan was observed the period of 1972 - 1978, 1990 - 1999, increased water content - in 1979 - 1989 and 2000 - 2007. In general, fluctuations of the river Baksan in Tegenekli village are consistent with changes in runoff of the same river in the city of Tyrnyauz. Minor differences of runoff between the two sites of Tegenekli village and the city of Tyrnyauz appeared in 2009 and 2010. The river flow of Baksan in the foothills (Zayukovo village) is characterized by low-water period from 1993 to 2000, the high-water period - from 2001 to 2008. In general, over the entire observation period from 1970 to 2010 at the source of the river Baksan -Teghenkly village changes in the flow are not observed. Runoff rate in the city of Tyrnyauz increased by 2% during the study period (1970 – 2010). A slight increase of the annual average water flowoff from the river Baksan in Tyrnyauz may be associated with high-altitude zoning, i.e. with the increase in the catchment area and density of the river network. Besides, we can not exclude the climatic features of the territory, which require the analysis of data on changes in precipitation and air temperature at altitude zones. Subsequently it is assumed a more detailed analysis of the effect of these parameters on the flow of river Baksan in the mountain area.
Tags: модуль стока, высотная зональность, река Баксан, сток, статистические характеристики, разностно-интегральная кривая
ISSN 1998-4502 (Print) ISSN 2499-975Х (Online)