Тип публикации: статья из журнала
Год издания: 2025
Идентификатор DOI: 10.17223/25421379/37/9
Ключевые слова: altai, Mayma River basin, minimum runoff, summer-autumn low water period, алтай, бассейн р. Майма, минимальный сток, летне-осенняя межень
Аннотация: Выполнена оценка изменений гидроклиматической составляющей стока на основе данных по метеорологическим станциям Росгидромета, расположенным на территории Алтайского края и Республики Алтай. С применением метода автоматического графо-аналитического расчленения гидрографа дана оценка изменений минимального стока для опорного бассейнаПоказать полностьюр. Майма и бассейнов-аналогов. В объеме грунтового стока летне-осенней межени наблюдается положительный тренд, статистически значимый на всех из рассматриваемых рек. This study presents the results of assessment of how changes in hydroclimatic forcing (air temperature and precipitation) affected river runoff in the Altai region between 1950 and 2022. We used the data from 42 local weather stations operated by Roshydromet government agency in the administrative regions of Altai Krai and Republic of Altai. Trends and change-points in the data were revealed using Mann-Kendall, Theil-Sen and Pettite tests. We further assessed the alteration of baseflow using automatic hydrograph separation filters applied to the data on the main experimental basin of the Maima River in Republic of Altai and several rivers across this region, similar in basin area and runoff generation conditions. The main findings include a tendency towards air temperature increase across all seasons both in lowland and highland environments in this region. The revealed trends in precipitation are significant only for the cold season due to increase in solid precipitation. Annual baseflow runoff volume on all of the accessed rivers shows trend towards increase, however all of these were statistically insignificant. On the contrary, summer baseflow volume trends proved to be significant, as well as mean annual baseflow discharge. Change-points in the time-series of the latter was detected in the 2000-s on all rivers. This is accompanied by an increase in low-flow period duration up to 14 days on all rivers. We assume that the revealed 15 to 20 year-hysteresis in reaction of low-flows to increase in precipitation may be due to delayed groundwater recharge and discharge into the river network. The latter may be due to distribution of carbonate rock deposits and variability in quaternary cover thickness, which may lead to interflow between groundwater into confined aquifers and formation of unified structures of aerated and confined layers.
Журнал: Геосферные исследования
Выпуск журнала: № 4
Номера страниц: 128-141
ISSN журнала: 25421379
Место издания: Томск
Издатель: Национальный исследовательский Томский государственный университет