У статті наведено оцінку мінімального стоку води в суббасейні річки Уж (оцінка внутрішньорічного розподілу з виокремленням характерних меженних сезонів, оцінка однорідності рядів спостережень, оцінка циклічності стоку для визначення фази, в якій наразі перебуває мінімальний стік). Виконана оцінка коливань мінімального стоку води та його сучасного стану. Створені нові карти ізоліній мінімального стоку води літньо-осіннього та зимового меженних періодів суббасейну р. Уж за 7-денний період.
В статье приведена оценка минимального стока в суббассейне реки Уж (оценка внутригодового распределения с выделением характерных меженных сезонов, оценка однородности рядов наблюдений, оценка цикличности стока для определения фазы, в которой сейчас находится минимальный сток). Была проведена оценка минимального стока и его современного состояния. Созданы новые карты изолиний минимального стока летне-осеннего и зимнего меженных периодов суббассейна р. Уж за 7-дневный период.
This article gives a rating of minimum river flow of the Uzh River subbasin. As part of the research, there was done intra-annual flow distribution. It was discovered that there are two special periods of low flow on this subbasin’s rivers. The first one runs from August to November (summer-&autumn period). The second one runs from December to February (winter period). Also was found that months from August to October are accounted for the lowest percentage of the annual runoff.
In order to calculate the average minimum values for each &year for two periods of runoff was found 7 days with a stable minimum flow. Physical and geographical features of the river basin, comparative flow and precipitation graph, scientific works of American scientists and IHA (Indicators of Hydrologic Alt&eration) program features became the basis for giving preference to 7-days period.
All series of observations are homogeneous according to the calculations in the program StokStat. The data series of hydrological post Uzh – Uzhhorod is homogeneous w&ith only parametrical criteria.
An estimation of the fluctuations of the minimum runoff was carried out using the method of constructing difference integral in order to know in what phase of the cycle there is a minimum flow currently. It is quite n&oticeable to see the transition of the minimum flow from the phase of low into the phase of high streamflow, and for both periods this transition can be observed in 1971.
One of the important issues of hydrological research is the determination of w&ater consumption in the absence of observations. In order to further evaluate the minimum runoff of the Uzh River at any point, there were constructed maps of isolines of the modules of the minimum runoff (l*s / km2) for the 7-day period for the wint&er and summer-autumn periods. The obtained maps are relevant and most detailed and modern for the rivers of the Uzh basin.
There was conducted the research of the connection between the actual values and the values taken from the maps. The connectio&n between calculated and cartographed minimal flow modules showed a close correlation, the correlation coefficients are r = 0.992 and 0.999 for two maps. In this case, the connection line is at an angle close to 45°. Consequently, the constructed map&s are reliable and can be used in the future to determine the value of minimum flow modules from other parts of the basin for practical and scientific purposes. In particular, this concerns the estimation of the minimum runoff of the river basins, fo&r solving various water management tasks: planning water supply and water intake works, designing and constructing hydrotechnical structures, performing reclamation works, etc.
