Stable isotopes relationship between precipitation and surface water, Phitsanulok
| Autor: | P. Nochit, W. Kulsawat |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Journal of Physics: Conference Series. 1380:012162 |
| ISSN: | 1742-6596 1742-6588 |
| DOI: | 10.1088/1742-6596/1380/1/012162 |
| Popis: | The stable isotope technique provides an effective way of identifying the basic hydrological processes and evaporation in the area. In this paper, the objectives were to investigate of the isotopic characteristics of the precipitation and surface water and to estimate the water evaporation loss from Yom River in the Chumsaeng Songkhram sub-district, Phitsanulok province for 2 years during 2016-2017. Results shown that the Local Meteoric Water Line (LMWL) was defined as δ2H = 7.346 δ18O + 2.141 (R2 = 0.98) with a slope of less than 8, indicating that some non-equilibrium evaporation processes occurred when the drops fell below the cloud base. The isotopic regression line for the surface water was δ2H = 3.543 δ18O –19.227 (R2 = 0.95). The slope of surface water (∼ 3.543) was less than the LMWL (∼ 7.346) which indicated the enrichment effect of evaporation. It revealed that the isotope composition of surface water had a linear relationship with precipitation (R2 = 0.26) and enable to determine the evaporation loss of surface water. The stable isotopes of precipitation and surface water were combined with meteorological data to calculate the evaporation to inflow ratio (E/I) of Yom River in the study site during dry season (November-April) was 22.54% and during wet season (May-October) was 6.42 %. |
| Databáze: | OpenAIRE |
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