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通过对岷江上游黑水县境内高海拔集水区和低海拔集水区3个时期氢稳定同位素变化的研究,发现氢稳定同位素值春季变正、夏季变负,并且随海拔高度的降低而变正。测定结果也表明,河水中氢稳定同位素的时空变化是降水形成机制和地形格局相互作用的结果。不同时期不同水源类型对于河水的贡献率不同,但在洪峰期,无论是高海拔还是低海拔集水区,降雨对河水的贡献都超过了20%。
Through the study of stable hydrogen isotopes in high water catchment area and low-altitude catchment area in Heishui County in the upper reaches of Minjiang River, hydrogen stable isotope values were found to be positive in spring and negative in summer and decrease with the altitude decreasing positive. The results also show that the temporal and spatial variations of hydrogen stable isotopes in the water are the result of the interaction between the precipitation mechanism and topographic pattern. Different types of water sources contributed to river water in different periods, but during the flood season, the contribution of rainfall to river water exceeded 20% in both high-altitude and low-altitude catchments.