Estimation of evaporation in the Aktru mountain-glacier basin based on actual data and geoinformation modeling
Monitoring and modeling of potential evaporation are necessary to understand completely the factors which influence hydrological regime of the high-mountain basin. Under conditions of the extremely poorly hydrometeorological information to calculate evaporation at the mountain territory, it is advisable to apply the combined method using direct network measurement of standard pan-evaporators, meteorological monitoring, as well as modern software tools of the modeling environment conditions and factors controlling the process. Aktru mountain-glacier basin was chosen as the territory of the study because it is typical for the Central Altai. The calculation of the actual evaporation from the water surface was carried out on two water-evaporation sites located in different landscape-altitude zones and equipped with standard GGI-3000 pan-evaporators. Based on the measured temperature gradients and the coefficient of daily anisotropic heating, the spatial distribution of temperatures of the surface air layer was calculated in the form of GRID matrices. Based on the digital elevation model in the SAGA GIS package, the indicators of sunshine time and the coefficients of the spatial distribution of potential incoming solar radiation over the studied basin were calculated. The calculation of evaporation from the water surface was carried out using L. Turk's and N.N. Ivanov's empirical formulas. Verification of GIS-based modeling was carried out under direct observations in the summer of 2022 in the Aktru mountain-glacial basin. It is important to note that in Aktru, June turned out to be the warmest month of 2022. A relationship has been established between evaporation from standard evaporators and climatic factors. It has been revealed that evaporation may increase with elevation. Partly, this fact can be explained by the local conditions of the location of the equipment. Thus, on the Goluboye Lake, there is a high wind speed and an increased incoming total solar radiation compared to the Aktru hydrometeorological station, which located in a valley depression. The results of the study are important for building a regional model of the hydrological cycle of the Altai mountain-glacial basins.
Keywords
potential evaporation,
mountain glacial basin,
pan evaporation,
solar irradiance,
digital elevation model,
climate changeAuthors
| Erofeev Alexander A. | National Research Tomsk State University | erofeew@yandex.ru |
| Kopysov Sergei G. | National Research Tomsk State University; Institute of Monitoring of Climatic and Ecological Systems (IMCES) SB RAS | wosypok@mail.ru |
| Garmaeva Tuyana B. | National Research Tomsk State University | tuyana2000garmaeva@yandex.ru |
Всего: 3
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