A Method for Tracing Lake Recharge Water Source Using Hydrogen and Oxygen Isotopes

Abstract

The invention discloses a lake supply water source tracing method using hydrogen and oxygen isotopes. The main steps are: collecting lake water samples and measuring the hydrogen and oxygen isotopes of the lake water ( 2 H, 18 O) abundance, obtain the temperature, relative humidity, and daily precipitation and evaporation data of the area where the lake is located, and construct the atmospheric precipitation line of the research area; calculate the theoretical value of hydrogen and oxygen isotope abundance under the evaporation balance and limit state at each time , to construct the dynamic evaporation process line of the lake, restore the hydrogen and oxygen isotope abundance of the lake water without undergoing the evaporation isotope fractionation stage, calculate the ratio of the lake evaporation to the inflow at each time period, and introduce the lake water and isotope mass conservation equations. The water supply and isotope abundance of the lake's recharge water source and consumption evaporation item in each period are finely divided, and then the lake inflow water R i And the corresponding isotope abundance change process line with time, and comprehensively analyze the change of lake inflow water source.

Description

technical field [0001] The invention belongs to the field of hydrological measurement, and in particular relates to a technical method for determining lake replenishment water sources based on isotope tracing technology. Background technique [0002] The cutting-edge research in the field of physical chemistry believes that the physical information of the water body is closely related to the chemical characteristics of the water body itself. Furthermore, on the basis of a macroscopic understanding of how physical and natural laws determine or affect the chemical information of water bodies, by monitoring the chemical signal changes of water bodies and constructing a reasonable mathematical model, the physical form of water bodies can be effectively reversed. [0003] Hydrogen and oxygen isotopes are known to be used ( 18 O, 2 H) mass conservation model to quantitatively evaluate lake evaporation and inflow methods. For example, patent CN 109598082 A discloses calculation m...

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Problems solved by technology

However, this method is too generalized and assumes that the water level of the lake is constant, and the results obtained are the average results based on several isotope test results, so it is difficult to correctly reflect the dynamic changes of the lake's recharge, and it cannot be objective and comprehensive. Show the time-scale change characteristics of lake water volume; secondly, for example, the method of patent CN106370802A can use hydrogen and oxygen isotopes to restore the water inflow and outflow of lakes, but cannot distinguish the water source components. The result of quantitative calculation is the sum of the recharge of all lakes, and It cannot distinguish the complex components involved in precipitation, snowfall, snowmelt runoff, surface runoff, underground runoff, etc., thus limiting the application of this technical method

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